struct blkio_cgroup blkio_root_cgroup = { .weight = 2*BLKIO_WEIGHT_DEFAULT };
EXPORT_SYMBOL_GPL(blkio_root_cgroup);
- static struct cgroup_subsys_state *blkiocg_create(struct cgroup_subsys *,
- struct cgroup *);
- static int blkiocg_can_attach(struct cgroup_subsys *, struct cgroup *,
- struct cgroup_taskset *);
- static void blkiocg_attach(struct cgroup_subsys *, struct cgroup *,
- struct cgroup_taskset *);
- static void blkiocg_destroy(struct cgroup_subsys *, struct cgroup *);
+ static struct cgroup_subsys_state *blkiocg_create(struct cgroup *);
+ static int blkiocg_can_attach(struct cgroup *, struct cgroup_taskset *);
+ static void blkiocg_attach(struct cgroup *, struct cgroup_taskset *);
+ static void blkiocg_destroy(struct cgroup *);
static int blkiocg_populate(struct cgroup_subsys *, struct cgroup *);
/* for encoding cft->private value on file */
ARRAY_SIZE(blkio_files));
}
- static void blkiocg_destroy(struct cgroup_subsys *subsys, struct cgroup *cgroup)
+ static void blkiocg_destroy(struct cgroup *cgroup)
{
struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgroup);
unsigned long flags;
kfree(blkcg);
}
- static struct cgroup_subsys_state *
- blkiocg_create(struct cgroup_subsys *subsys, struct cgroup *cgroup)
+ static struct cgroup_subsys_state *blkiocg_create(struct cgroup *cgroup)
{
struct blkio_cgroup *blkcg;
struct cgroup *parent = cgroup->parent;
* of the main cic data structures. For now we allow a task to change
* its cgroup only if it's the only owner of its ioc.
*/
- static int blkiocg_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
- struct cgroup_taskset *tset)
+ static int blkiocg_can_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
{
struct task_struct *task;
struct io_context *ioc;
return ret;
}
- static void blkiocg_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
- struct cgroup_taskset *tset)
+ static void blkiocg_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
{
struct task_struct *task;
struct io_context *ioc;
ioc = get_task_io_context(task, GFP_ATOMIC, NUMA_NO_NODE);
if (ioc) {
ioc_cgroup_changed(ioc);
- put_io_context(ioc, NULL);
+ put_io_context(ioc);
}
}
}
#include <linux/uaccess.h>
#include <linux/memcontrol.h>
#include <linux/res_counter.h>
+#include <linux/static_key.h>
#include <linux/filter.h>
#include <linux/rculist_nulls.h>
struct cgroup_subsys;
#ifdef CONFIG_NET
int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss);
- void mem_cgroup_sockets_destroy(struct cgroup *cgrp, struct cgroup_subsys *ss);
+ void mem_cgroup_sockets_destroy(struct cgroup *cgrp);
#else
static inline
int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss)
return 0;
}
static inline
- void mem_cgroup_sockets_destroy(struct cgroup *cgrp, struct cgroup_subsys *ss)
+ void mem_cgroup_sockets_destroy(struct cgroup *cgrp)
{
}
#endif
* @sk_ack_backlog: current listen backlog
* @sk_max_ack_backlog: listen backlog set in listen()
* @sk_priority: %SO_PRIORITY setting
+ * @sk_cgrp_prioidx: socket group's priority map index
* @sk_type: socket type (%SOCK_STREAM, etc)
* @sk_protocol: which protocol this socket belongs in this network family
* @sk_peer_pid: &struct pid for this socket's peer
*/
int (*init_cgroup)(struct cgroup *cgrp,
struct cgroup_subsys *ss);
- void (*destroy_cgroup)(struct cgroup *cgrp,
- struct cgroup_subsys *ss);
+ void (*destroy_cgroup)(struct cgroup *cgrp);
struct cg_proto *(*proto_cgroup)(struct mem_cgroup *memcg);
#endif
};
#define sk_refcnt_debug_release(sk) do { } while (0)
#endif /* SOCK_REFCNT_DEBUG */
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
-extern struct jump_label_key memcg_socket_limit_enabled;
+#if defined(CONFIG_CGROUP_MEM_RES_CTLR_KMEM) && defined(CONFIG_NET)
+extern struct static_key memcg_socket_limit_enabled;
static inline struct cg_proto *parent_cg_proto(struct proto *proto,
struct cg_proto *cg_proto)
{
return proto->proto_cgroup(parent_mem_cgroup(cg_proto->memcg));
}
-#define mem_cgroup_sockets_enabled static_branch(&memcg_socket_limit_enabled)
+#define mem_cgroup_sockets_enabled static_key_false(&memcg_socket_limit_enabled)
#else
#define mem_cgroup_sockets_enabled 0
static inline struct cg_proto *parent_cg_proto(struct proto *proto,
struct res_counter *fail;
int ret;
- ret = res_counter_charge(prot->memory_allocated,
- amt << PAGE_SHIFT, &fail);
-
+ ret = res_counter_charge_nofail(prot->memory_allocated,
+ amt << PAGE_SHIFT, &fail);
if (ret < 0)
*parent_status = OVER_LIMIT;
}
}
static inline void
-sk_memory_allocated_sub(struct sock *sk, int amt, int parent_status)
+sk_memory_allocated_sub(struct sock *sk, int amt)
{
struct proto *prot = sk->sk_prot;
- if (mem_cgroup_sockets_enabled && sk->sk_cgrp &&
- parent_status != OVER_LIMIT) /* Otherwise was uncharged already */
+ if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
memcg_memory_allocated_sub(sk->sk_cgrp, amt);
atomic_long_sub(amt, prot->memory_allocated);
PERF_FLAG_FD_OUTPUT |\
PERF_FLAG_PID_CGROUP)
+/*
+ * branch priv levels that need permission checks
+ */
+#define PERF_SAMPLE_BRANCH_PERM_PLM \
+ (PERF_SAMPLE_BRANCH_KERNEL |\
+ PERF_SAMPLE_BRANCH_HV)
+
enum event_type_t {
EVENT_FLEXIBLE = 0x1,
EVENT_PINNED = 0x2,
* perf_sched_events : >0 events exist
* perf_cgroup_events: >0 per-cpu cgroup events exist on this cpu
*/
-struct jump_label_key_deferred perf_sched_events __read_mostly;
+struct static_key_deferred perf_sched_events __read_mostly;
static DEFINE_PER_CPU(atomic_t, perf_cgroup_events);
+static DEFINE_PER_CPU(atomic_t, perf_branch_stack_events);
static atomic_t nr_mmap_events __read_mostly;
static atomic_t nr_comm_events __read_mostly;
* here.
*/
if (is_cgroup_event(event))
- run_end = perf_event_time(event);
+ run_end = perf_cgroup_event_time(event);
else if (ctx->is_active)
run_end = ctx->time;
else
if (is_cgroup_event(event))
ctx->nr_cgroups++;
+ if (has_branch_stack(event))
+ ctx->nr_branch_stack++;
+
list_add_rcu(&event->event_entry, &ctx->event_list);
if (!ctx->nr_events)
perf_pmu_rotate_start(ctx->pmu);
cpuctx->cgrp = NULL;
}
+ if (has_branch_stack(event))
+ ctx->nr_branch_stack--;
+
ctx->nr_events--;
if (event->attr.inherit_stat)
ctx->nr_stat--;
perf_pmu_rotate_start(ctx->pmu);
}
+/*
+ * When sampling the branck stack in system-wide, it may be necessary
+ * to flush the stack on context switch. This happens when the branch
+ * stack does not tag its entries with the pid of the current task.
+ * Otherwise it becomes impossible to associate a branch entry with a
+ * task. This ambiguity is more likely to appear when the branch stack
+ * supports priv level filtering and the user sets it to monitor only
+ * at the user level (which could be a useful measurement in system-wide
+ * mode). In that case, the risk is high of having a branch stack with
+ * branch from multiple tasks. Flushing may mean dropping the existing
+ * entries or stashing them somewhere in the PMU specific code layer.
+ *
+ * This function provides the context switch callback to the lower code
+ * layer. It is invoked ONLY when there is at least one system-wide context
+ * with at least one active event using taken branch sampling.
+ */
+static void perf_branch_stack_sched_in(struct task_struct *prev,
+ struct task_struct *task)
+{
+ struct perf_cpu_context *cpuctx;
+ struct pmu *pmu;
+ unsigned long flags;
+
+ /* no need to flush branch stack if not changing task */
+ if (prev == task)
+ return;
+
+ local_irq_save(flags);
+
+ rcu_read_lock();
+
+ list_for_each_entry_rcu(pmu, &pmus, entry) {
+ cpuctx = this_cpu_ptr(pmu->pmu_cpu_context);
+
+ /*
+ * check if the context has at least one
+ * event using PERF_SAMPLE_BRANCH_STACK
+ */
+ if (cpuctx->ctx.nr_branch_stack > 0
+ && pmu->flush_branch_stack) {
+
+ pmu = cpuctx->ctx.pmu;
+
+ perf_ctx_lock(cpuctx, cpuctx->task_ctx);
+
+ perf_pmu_disable(pmu);
+
+ pmu->flush_branch_stack();
+
+ perf_pmu_enable(pmu);
+
+ perf_ctx_unlock(cpuctx, cpuctx->task_ctx);
+ }
+ }
+
+ rcu_read_unlock();
+
+ local_irq_restore(flags);
+}
+
/*
* Called from scheduler to add the events of the current task
* with interrupts disabled.
*/
if (atomic_read(&__get_cpu_var(perf_cgroup_events)))
perf_cgroup_sched_in(prev, task);
+
+ /* check for system-wide branch_stack events */
+ if (atomic_read(&__get_cpu_var(perf_branch_stack_events)))
+ perf_branch_stack_sched_in(prev, task);
}
static u64 perf_calculate_period(struct perf_event *event, u64 nsec, u64 count)
return div64_u64(dividend, divisor);
}
-static void perf_adjust_period(struct perf_event *event, u64 nsec, u64 count)
+static DEFINE_PER_CPU(int, perf_throttled_count);
+static DEFINE_PER_CPU(u64, perf_throttled_seq);
+
+static void perf_adjust_period(struct perf_event *event, u64 nsec, u64 count, bool disable)
{
struct hw_perf_event *hwc = &event->hw;
s64 period, sample_period;
hwc->sample_period = sample_period;
if (local64_read(&hwc->period_left) > 8*sample_period) {
- event->pmu->stop(event, PERF_EF_UPDATE);
+ if (disable)
+ event->pmu->stop(event, PERF_EF_UPDATE);
+
local64_set(&hwc->period_left, 0);
- event->pmu->start(event, PERF_EF_RELOAD);
+
+ if (disable)
+ event->pmu->start(event, PERF_EF_RELOAD);
}
}
-static void perf_ctx_adjust_freq(struct perf_event_context *ctx, u64 period)
+/*
+ * combine freq adjustment with unthrottling to avoid two passes over the
+ * events. At the same time, make sure, having freq events does not change
+ * the rate of unthrottling as that would introduce bias.
+ */
+static void perf_adjust_freq_unthr_context(struct perf_event_context *ctx,
+ int needs_unthr)
{
struct perf_event *event;
struct hw_perf_event *hwc;
- u64 interrupts, now;
+ u64 now, period = TICK_NSEC;
s64 delta;
- if (!ctx->nr_freq)
+ /*
+ * only need to iterate over all events iff:
+ * - context have events in frequency mode (needs freq adjust)
+ * - there are events to unthrottle on this cpu
+ */
+ if (!(ctx->nr_freq || needs_unthr))
return;
+ raw_spin_lock(&ctx->lock);
+ perf_pmu_disable(ctx->pmu);
+
list_for_each_entry_rcu(event, &ctx->event_list, event_entry) {
if (event->state != PERF_EVENT_STATE_ACTIVE)
continue;
hwc = &event->hw;
- interrupts = hwc->interrupts;
- hwc->interrupts = 0;
-
- /*
- * unthrottle events on the tick
- */
- if (interrupts == MAX_INTERRUPTS) {
+ if (needs_unthr && hwc->interrupts == MAX_INTERRUPTS) {
+ hwc->interrupts = 0;
perf_log_throttle(event, 1);
event->pmu->start(event, 0);
}
if (!event->attr.freq || !event->attr.sample_freq)
continue;
- event->pmu->read(event);
+ /*
+ * stop the event and update event->count
+ */
+ event->pmu->stop(event, PERF_EF_UPDATE);
+
now = local64_read(&event->count);
delta = now - hwc->freq_count_stamp;
hwc->freq_count_stamp = now;
+ /*
+ * restart the event
+ * reload only if value has changed
+ * we have stopped the event so tell that
+ * to perf_adjust_period() to avoid stopping it
+ * twice.
+ */
if (delta > 0)
- perf_adjust_period(event, period, delta);
+ perf_adjust_period(event, period, delta, false);
+
+ event->pmu->start(event, delta > 0 ? PERF_EF_RELOAD : 0);
}
+
+ perf_pmu_enable(ctx->pmu);
+ raw_spin_unlock(&ctx->lock);
}
/*
*/
static void perf_rotate_context(struct perf_cpu_context *cpuctx)
{
- u64 interval = (u64)cpuctx->jiffies_interval * TICK_NSEC;
struct perf_event_context *ctx = NULL;
- int rotate = 0, remove = 1, freq = 0;
+ int rotate = 0, remove = 1;
if (cpuctx->ctx.nr_events) {
remove = 0;
if (cpuctx->ctx.nr_events != cpuctx->ctx.nr_active)
rotate = 1;
- if (cpuctx->ctx.nr_freq)
- freq = 1;
}
ctx = cpuctx->task_ctx;
remove = 0;
if (ctx->nr_events != ctx->nr_active)
rotate = 1;
- if (ctx->nr_freq)
- freq = 1;
}
- if (!rotate && !freq)
+ if (!rotate)
goto done;
perf_ctx_lock(cpuctx, cpuctx->task_ctx);
perf_pmu_disable(cpuctx->ctx.pmu);
- if (freq) {
- perf_ctx_adjust_freq(&cpuctx->ctx, interval);
- if (ctx)
- perf_ctx_adjust_freq(ctx, interval);
- }
-
- if (rotate) {
- cpu_ctx_sched_out(cpuctx, EVENT_FLEXIBLE);
- if (ctx)
- ctx_sched_out(ctx, cpuctx, EVENT_FLEXIBLE);
+ cpu_ctx_sched_out(cpuctx, EVENT_FLEXIBLE);
+ if (ctx)
+ ctx_sched_out(ctx, cpuctx, EVENT_FLEXIBLE);
- rotate_ctx(&cpuctx->ctx);
- if (ctx)
- rotate_ctx(ctx);
+ rotate_ctx(&cpuctx->ctx);
+ if (ctx)
+ rotate_ctx(ctx);
- perf_event_sched_in(cpuctx, ctx, current);
- }
+ perf_event_sched_in(cpuctx, ctx, current);
perf_pmu_enable(cpuctx->ctx.pmu);
perf_ctx_unlock(cpuctx, cpuctx->task_ctx);
-
done:
if (remove)
list_del_init(&cpuctx->rotation_list);
{
struct list_head *head = &__get_cpu_var(rotation_list);
struct perf_cpu_context *cpuctx, *tmp;
+ struct perf_event_context *ctx;
+ int throttled;
WARN_ON(!irqs_disabled());
+ __this_cpu_inc(perf_throttled_seq);
+ throttled = __this_cpu_xchg(perf_throttled_count, 0);
+
list_for_each_entry_safe(cpuctx, tmp, head, rotation_list) {
+ ctx = &cpuctx->ctx;
+ perf_adjust_freq_unthr_context(ctx, throttled);
+
+ ctx = cpuctx->task_ctx;
+ if (ctx)
+ perf_adjust_freq_unthr_context(ctx, throttled);
+
if (cpuctx->jiffies_interval == 1 ||
!(jiffies % cpuctx->jiffies_interval))
perf_rotate_context(cpuctx);
if (!event->parent) {
if (event->attach_state & PERF_ATTACH_TASK)
- jump_label_dec_deferred(&perf_sched_events);
+ static_key_slow_dec_deferred(&perf_sched_events);
if (event->attr.mmap || event->attr.mmap_data)
atomic_dec(&nr_mmap_events);
if (event->attr.comm)
put_callchain_buffers();
if (is_cgroup_event(event)) {
atomic_dec(&per_cpu(perf_cgroup_events, event->cpu));
- jump_label_dec_deferred(&perf_sched_events);
+ static_key_slow_dec_deferred(&perf_sched_events);
+ }
+
+ if (has_branch_stack(event)) {
+ static_key_slow_dec_deferred(&perf_sched_events);
+ /* is system-wide event */
+ if (!(event->attach_state & PERF_ATTACH_TASK))
+ atomic_dec(&per_cpu(perf_branch_stack_events,
+ event->cpu));
}
}
return 0;
}
-#ifndef PERF_EVENT_INDEX_OFFSET
-# define PERF_EVENT_INDEX_OFFSET 0
-#endif
-
static int perf_event_index(struct perf_event *event)
{
if (event->hw.state & PERF_HES_STOPPED)
if (event->state != PERF_EVENT_STATE_ACTIVE)
return 0;
- return event->hw.idx + 1 - PERF_EVENT_INDEX_OFFSET;
+ return event->pmu->event_idx(event);
}
static void calc_timer_values(struct perf_event *event,
+ u64 *now,
u64 *enabled,
u64 *running)
{
- u64 now, ctx_time;
+ u64 ctx_time;
- now = perf_clock();
- ctx_time = event->shadow_ctx_time + now;
+ *now = perf_clock();
+ ctx_time = event->shadow_ctx_time + *now;
*enabled = ctx_time - event->tstamp_enabled;
*running = ctx_time - event->tstamp_running;
}
+void __weak perf_update_user_clock(struct perf_event_mmap_page *userpg, u64 now)
+{
+}
+
/*
* Callers need to ensure there can be no nesting of this function, otherwise
* the seqlock logic goes bad. We can not serialize this because the arch
{
struct perf_event_mmap_page *userpg;
struct ring_buffer *rb;
- u64 enabled, running;
+ u64 enabled, running, now;
rcu_read_lock();
/*
* because of locking issue as we can be called in
* NMI context
*/
- calc_timer_values(event, &enabled, &running);
+ calc_timer_values(event, &now, &enabled, &running);
rb = rcu_dereference(event->rb);
if (!rb)
goto unlock;
barrier();
userpg->index = perf_event_index(event);
userpg->offset = perf_event_count(event);
- if (event->state == PERF_EVENT_STATE_ACTIVE)
+ if (userpg->index)
userpg->offset -= local64_read(&event->hw.prev_count);
userpg->time_enabled = enabled +
userpg->time_running = running +
atomic64_read(&event->child_total_time_running);
+ perf_update_user_clock(userpg, now);
+
barrier();
++userpg->lock;
preempt_enable();
event->mmap_user = get_current_user();
vma->vm_mm->pinned_vm += event->mmap_locked;
+ perf_event_update_userpage(event);
+
unlock:
if (!ret)
atomic_inc(&event->mmap_count);
static void perf_output_read(struct perf_output_handle *handle,
struct perf_event *event)
{
- u64 enabled = 0, running = 0;
+ u64 enabled = 0, running = 0, now;
u64 read_format = event->attr.read_format;
/*
* NMI context
*/
if (read_format & PERF_FORMAT_TOTAL_TIMES)
- calc_timer_values(event, &enabled, &running);
+ calc_timer_values(event, &now, &enabled, &running);
if (event->attr.read_format & PERF_FORMAT_GROUP)
perf_output_read_group(handle, event, enabled, running);
}
}
}
+
+ if (sample_type & PERF_SAMPLE_BRANCH_STACK) {
+ if (data->br_stack) {
+ size_t size;
+
+ size = data->br_stack->nr
+ * sizeof(struct perf_branch_entry);
+
+ perf_output_put(handle, data->br_stack->nr);
+ perf_output_copy(handle, data->br_stack->entries, size);
+ } else {
+ /*
+ * we always store at least the value of nr
+ */
+ u64 nr = 0;
+ perf_output_put(handle, nr);
+ }
+ }
}
void perf_prepare_sample(struct perf_event_header *header,
WARN_ON_ONCE(size & (sizeof(u64)-1));
header->size += size;
}
+
+ if (sample_type & PERF_SAMPLE_BRANCH_STACK) {
+ int size = sizeof(u64); /* nr */
+ if (data->br_stack) {
+ size += data->br_stack->nr
+ * sizeof(struct perf_branch_entry);
+ }
+ header->size += size;
+ }
}
static void perf_event_output(struct perf_event *event,
{
int events = atomic_read(&event->event_limit);
struct hw_perf_event *hwc = &event->hw;
+ u64 seq;
int ret = 0;
/*
if (unlikely(!is_sampling_event(event)))
return 0;
- if (unlikely(hwc->interrupts >= max_samples_per_tick)) {
- if (throttle) {
+ seq = __this_cpu_read(perf_throttled_seq);
+ if (seq != hwc->interrupts_seq) {
+ hwc->interrupts_seq = seq;
+ hwc->interrupts = 1;
+ } else {
+ hwc->interrupts++;
+ if (unlikely(throttle
+ && hwc->interrupts >= max_samples_per_tick)) {
+ __this_cpu_inc(perf_throttled_count);
hwc->interrupts = MAX_INTERRUPTS;
perf_log_throttle(event, 0);
ret = 1;
}
- } else
- hwc->interrupts++;
+ }
if (event->attr.freq) {
u64 now = perf_clock();
hwc->freq_time_stamp = now;
if (delta > 0 && delta < 2*TICK_NSEC)
- perf_adjust_period(event, delta, hwc->last_period);
+ perf_adjust_period(event, delta, hwc->last_period, true);
}
/*
return err;
}
-struct jump_label_key perf_swevent_enabled[PERF_COUNT_SW_MAX];
+struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX];
static void sw_perf_event_destroy(struct perf_event *event)
{
WARN_ON(event->parent);
- jump_label_dec(&perf_swevent_enabled[event_id]);
+ static_key_slow_dec(&perf_swevent_enabled[event_id]);
swevent_hlist_put(event);
}
if (event->attr.type != PERF_TYPE_SOFTWARE)
return -ENOENT;
+ /*
+ * no branch sampling for software events
+ */
+ if (has_branch_stack(event))
+ return -EOPNOTSUPP;
+
switch (event_id) {
case PERF_COUNT_SW_CPU_CLOCK:
case PERF_COUNT_SW_TASK_CLOCK:
if (err)
return err;
- jump_label_inc(&perf_swevent_enabled[event_id]);
+ static_key_slow_inc(&perf_swevent_enabled[event_id]);
event->destroy = sw_perf_event_destroy;
}
return 0;
}
+static int perf_swevent_event_idx(struct perf_event *event)
+{
+ return 0;
+}
+
static struct pmu perf_swevent = {
.task_ctx_nr = perf_sw_context,
.start = perf_swevent_start,
.stop = perf_swevent_stop,
.read = perf_swevent_read,
+
+ .event_idx = perf_swevent_event_idx,
};
#ifdef CONFIG_EVENT_TRACING
if (event->attr.type != PERF_TYPE_TRACEPOINT)
return -ENOENT;
+ /*
+ * no branch sampling for tracepoint events
+ */
+ if (has_branch_stack(event))
+ return -EOPNOTSUPP;
+
err = perf_trace_init(event);
if (err)
return err;
.start = perf_swevent_start,
.stop = perf_swevent_stop,
.read = perf_swevent_read,
+
+ .event_idx = perf_swevent_event_idx,
};
static inline void perf_tp_register(void)
if (event->attr.config != PERF_COUNT_SW_CPU_CLOCK)
return -ENOENT;
+ /*
+ * no branch sampling for software events
+ */
+ if (has_branch_stack(event))
+ return -EOPNOTSUPP;
+
perf_swevent_init_hrtimer(event);
return 0;
.start = cpu_clock_event_start,
.stop = cpu_clock_event_stop,
.read = cpu_clock_event_read,
+
+ .event_idx = perf_swevent_event_idx,
};
/*
if (event->attr.config != PERF_COUNT_SW_TASK_CLOCK)
return -ENOENT;
+ /*
+ * no branch sampling for software events
+ */
+ if (has_branch_stack(event))
+ return -EOPNOTSUPP;
+
perf_swevent_init_hrtimer(event);
return 0;
.start = task_clock_event_start,
.stop = task_clock_event_stop,
.read = task_clock_event_read,
+
+ .event_idx = perf_swevent_event_idx,
};
static void perf_pmu_nop_void(struct pmu *pmu)
perf_pmu_enable(pmu);
}
+static int perf_event_idx_default(struct perf_event *event)
+{
+ return event->hw.idx + 1;
+}
+
/*
* Ensures all contexts with the same task_ctx_nr have the same
* pmu_cpu_context too.
if (!pmu->dev)
goto out;
+ pmu->dev->groups = pmu->attr_groups;
device_initialize(pmu->dev);
ret = dev_set_name(pmu->dev, "%s", pmu->name);
if (ret)
pmu->pmu_disable = perf_pmu_nop_void;
}
+ if (!pmu->event_idx)
+ pmu->event_idx = perf_event_idx_default;
+
list_add_rcu(&pmu->entry, &pmus);
ret = 0;
unlock:
if (!event->parent) {
if (event->attach_state & PERF_ATTACH_TASK)
- jump_label_inc(&perf_sched_events.key);
+ static_key_slow_inc(&perf_sched_events.key);
if (event->attr.mmap || event->attr.mmap_data)
atomic_inc(&nr_mmap_events);
if (event->attr.comm)
return ERR_PTR(err);
}
}
+ if (has_branch_stack(event)) {
+ static_key_slow_inc(&perf_sched_events.key);
+ if (!(event->attach_state & PERF_ATTACH_TASK))
+ atomic_inc(&per_cpu(perf_branch_stack_events,
+ event->cpu));
+ }
}
return event;
if (attr->read_format & ~(PERF_FORMAT_MAX-1))
return -EINVAL;
+ if (attr->sample_type & PERF_SAMPLE_BRANCH_STACK) {
+ u64 mask = attr->branch_sample_type;
+
+ /* only using defined bits */
+ if (mask & ~(PERF_SAMPLE_BRANCH_MAX-1))
+ return -EINVAL;
+
+ /* at least one branch bit must be set */
+ if (!(mask & ~PERF_SAMPLE_BRANCH_PLM_ALL))
+ return -EINVAL;
+
+ /* kernel level capture: check permissions */
+ if ((mask & PERF_SAMPLE_BRANCH_PERM_PLM)
+ && perf_paranoid_kernel() && !capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ /* propagate priv level, when not set for branch */
+ if (!(mask & PERF_SAMPLE_BRANCH_PLM_ALL)) {
+
+ /* exclude_kernel checked on syscall entry */
+ if (!attr->exclude_kernel)
+ mask |= PERF_SAMPLE_BRANCH_KERNEL;
+
+ if (!attr->exclude_user)
+ mask |= PERF_SAMPLE_BRANCH_USER;
+
+ if (!attr->exclude_hv)
+ mask |= PERF_SAMPLE_BRANCH_HV;
+ /*
+ * adjust user setting (for HW filter setup)
+ */
+ attr->branch_sample_type = mask;
+ }
+ }
out:
return ret;
* - that may need work on context switch
*/
atomic_inc(&per_cpu(perf_cgroup_events, event->cpu));
- jump_label_inc(&perf_sched_events.key);
+ static_key_slow_inc(&perf_sched_events.key);
}
/*
device_initcall(perf_event_sysfs_init);
#ifdef CONFIG_CGROUP_PERF
- static struct cgroup_subsys_state *perf_cgroup_create(
- struct cgroup_subsys *ss, struct cgroup *cont)
+ static struct cgroup_subsys_state *perf_cgroup_create(struct cgroup *cont)
{
struct perf_cgroup *jc;
return &jc->css;
}
- static void perf_cgroup_destroy(struct cgroup_subsys *ss,
- struct cgroup *cont)
+ static void perf_cgroup_destroy(struct cgroup *cont)
{
struct perf_cgroup *jc;
jc = container_of(cgroup_subsys_state(cont, perf_subsys_id),
return 0;
}
- static void perf_cgroup_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
- struct cgroup_taskset *tset)
+ static void perf_cgroup_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
{
struct task_struct *task;
task_function_call(task, __perf_cgroup_move, task);
}
- static void perf_cgroup_exit(struct cgroup_subsys *ss, struct cgroup *cgrp,
- struct cgroup *old_cgrp, struct task_struct *task)
+ static void perf_cgroup_exit(struct cgroup *cgrp, struct cgroup *old_cgrp,
+ struct task_struct *task)
{
/*
* cgroup_exit() is called in the copy_process() failure path.
#include <asm/tlb.h>
#include <asm/irq_regs.h>
+#include <asm/mutex.h>
#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#endif
#ifdef HAVE_JUMP_LABEL
-#define jump_label_key__true jump_label_key_enabled
-#define jump_label_key__false jump_label_key_disabled
+#define jump_label_key__true STATIC_KEY_INIT_TRUE
+#define jump_label_key__false STATIC_KEY_INIT_FALSE
#define SCHED_FEAT(name, enabled) \
jump_label_key__##enabled ,
-struct jump_label_key sched_feat_keys[__SCHED_FEAT_NR] = {
+struct static_key sched_feat_keys[__SCHED_FEAT_NR] = {
#include "features.h"
};
static void sched_feat_disable(int i)
{
- if (jump_label_enabled(&sched_feat_keys[i]))
- jump_label_dec(&sched_feat_keys[i]);
+ if (static_key_enabled(&sched_feat_keys[i]))
+ static_key_slow_dec(&sched_feat_keys[i]);
}
static void sched_feat_enable(int i)
{
- if (!jump_label_enabled(&sched_feat_keys[i]))
- jump_label_inc(&sched_feat_keys[i]);
+ if (!static_key_enabled(&sched_feat_keys[i]))
+ static_key_slow_inc(&sched_feat_keys[i]);
}
#else
static void sched_feat_disable(int i) { };
p->sched_class->dequeue_task(rq, p, flags);
}
-/*
- * activate_task - move a task to the runqueue.
- */
void activate_task(struct rq *rq, struct task_struct *p, int flags)
{
if (task_contributes_to_load(p))
enqueue_task(rq, p, flags);
}
-/*
- * deactivate_task - remove a task from the runqueue.
- */
void deactivate_task(struct rq *rq, struct task_struct *p, int flags)
{
if (task_contributes_to_load(p))
delta -= irq_delta;
#endif
#ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING
- if (static_branch((¶virt_steal_rq_enabled))) {
+ if (static_key_false((¶virt_steal_rq_enabled))) {
u64 st;
steal = paravirt_steal_clock(cpu_of(rq));
* leave kernel.
*/
if (p->mm && printk_ratelimit()) {
- printk(KERN_INFO "process %d (%s) no longer affine to cpu%d\n",
+ printk_sched("process %d (%s) no longer affine to cpu%d\n",
task_pid_nr(p), p->comm, cpu);
}
}
#endif /* __ARCH_WANT_INTERRUPTS_ON_CTXSW */
-static inline int ttwu_share_cache(int this_cpu, int that_cpu)
+bool cpus_share_cache(int this_cpu, int that_cpu)
{
return per_cpu(sd_llc_id, this_cpu) == per_cpu(sd_llc_id, that_cpu);
}
struct rq *rq = cpu_rq(cpu);
#if defined(CONFIG_SMP)
- if (sched_feat(TTWU_QUEUE) && !ttwu_share_cache(smp_processor_id(), cpu)) {
+ if (sched_feat(TTWU_QUEUE) && !cpus_share_cache(smp_processor_id(), cpu)) {
sched_clock_cpu(cpu); /* sync clocks x-cpu */
ttwu_queue_remote(p, cpu);
return;
local_irq_enable();
#endif /* __ARCH_WANT_INTERRUPTS_ON_CTXSW */
finish_lock_switch(rq, prev);
- trace_sched_stat_sleeptime(current, rq->clock);
fire_sched_in_preempt_notifiers(current);
if (mm)
* Once we've updated the global active value, we need to apply the exponential
* weights adjusted to the number of cycles missed.
*/
-static void calc_global_nohz(unsigned long ticks)
+static void calc_global_nohz(void)
{
long delta, active, n;
- if (time_before(jiffies, calc_load_update))
- return;
-
/*
* If we crossed a calc_load_update boundary, make sure to fold
* any pending idle changes, the respective CPUs might have
atomic_long_add(delta, &calc_load_tasks);
/*
- * If we were idle for multiple load cycles, apply them.
+ * It could be the one fold was all it took, we done!
*/
- if (ticks >= LOAD_FREQ) {
- n = ticks / LOAD_FREQ;
+ if (time_before(jiffies, calc_load_update + 10))
+ return;
- active = atomic_long_read(&calc_load_tasks);
- active = active > 0 ? active * FIXED_1 : 0;
+ /*
+ * Catch-up, fold however many we are behind still
+ */
+ delta = jiffies - calc_load_update - 10;
+ n = 1 + (delta / LOAD_FREQ);
- avenrun[0] = calc_load_n(avenrun[0], EXP_1, active, n);
- avenrun[1] = calc_load_n(avenrun[1], EXP_5, active, n);
- avenrun[2] = calc_load_n(avenrun[2], EXP_15, active, n);
+ active = atomic_long_read(&calc_load_tasks);
+ active = active > 0 ? active * FIXED_1 : 0;
- calc_load_update += n * LOAD_FREQ;
- }
+ avenrun[0] = calc_load_n(avenrun[0], EXP_1, active, n);
+ avenrun[1] = calc_load_n(avenrun[1], EXP_5, active, n);
+ avenrun[2] = calc_load_n(avenrun[2], EXP_15, active, n);
- /*
- * Its possible the remainder of the above division also crosses
- * a LOAD_FREQ period, the regular check in calc_global_load()
- * which comes after this will take care of that.
- *
- * Consider us being 11 ticks before a cycle completion, and us
- * sleeping for 4*LOAD_FREQ + 22 ticks, then the above code will
- * age us 4 cycles, and the test in calc_global_load() will
- * pick up the final one.
- */
+ calc_load_update += n * LOAD_FREQ;
}
#else
void calc_load_account_idle(struct rq *this_rq)
return 0;
}
-static void calc_global_nohz(unsigned long ticks)
+static void calc_global_nohz(void)
{
}
#endif
{
long active;
- calc_global_nohz(ticks);
-
if (time_before(jiffies, calc_load_update + 10))
return;
avenrun[2] = calc_load(avenrun[2], EXP_15, active);
calc_load_update += LOAD_FREQ;
+
+ /*
+ * Account one period with whatever state we found before
+ * folding in the nohz state and ageing the entire idle period.
+ *
+ * This avoids loosing a sample when we go idle between
+ * calc_load_account_active() (10 ticks ago) and now and thus
+ * under-accounting.
+ */
+ calc_global_nohz();
}
/*
static __always_inline bool steal_account_process_tick(void)
{
#ifdef CONFIG_PARAVIRT
- if (static_branch(¶virt_steal_enabled)) {
+ if (static_key_false(¶virt_steal_enabled)) {
u64 steal, st = 0;
steal = paravirt_steal_clock(smp_processor_id());
post_schedule(rq);
- preempt_enable_no_resched();
+ sched_preempt_enable_no_resched();
if (need_resched())
goto need_resched;
}
static inline void sched_submit_work(struct task_struct *tsk)
{
- if (!tsk->state)
+ if (!tsk->state || tsk_is_pi_blocked(tsk))
return;
/*
* If we are going to sleep and we have plugged IO queued,
}
EXPORT_SYMBOL(schedule);
+/**
+ * schedule_preempt_disabled - called with preemption disabled
+ *
+ * Returns with preemption disabled. Note: preempt_count must be 1
+ */
+void __sched schedule_preempt_disabled(void)
+{
+ sched_preempt_enable_no_resched();
+ schedule();
+ preempt_disable();
+}
+
#ifdef CONFIG_MUTEX_SPIN_ON_OWNER
static inline bool owner_running(struct mutex *lock, struct task_struct *owner)
/*
* Same as __wake_up but called with the spinlock in wait_queue_head_t held.
*/
-void __wake_up_locked(wait_queue_head_t *q, unsigned int mode)
+void __wake_up_locked(wait_queue_head_t *q, unsigned int mode, int nr)
{
- __wake_up_common(q, mode, 1, 0, NULL);
+ __wake_up_common(q, mode, nr, 0, NULL);
}
EXPORT_SYMBOL_GPL(__wake_up_locked);
rq = __task_rq_lock(p);
+ /*
+ * Idle task boosting is a nono in general. There is one
+ * exception, when PREEMPT_RT and NOHZ is active:
+ *
+ * The idle task calls get_next_timer_interrupt() and holds
+ * the timer wheel base->lock on the CPU and another CPU wants
+ * to access the timer (probably to cancel it). We can safely
+ * ignore the boosting request, as the idle CPU runs this code
+ * with interrupts disabled and will complete the lock
+ * protected section without being interrupted. So there is no
+ * real need to boost.
+ */
+ if (unlikely(p == rq->idle)) {
+ WARN_ON(p != rq->curr);
+ WARN_ON(p->pi_blocked_on);
+ goto out_unlock;
+ }
+
trace_sched_pi_setprio(p, prio);
oldprio = p->prio;
prev_class = p->sched_class;
enqueue_task(rq, p, oldprio < prio ? ENQUEUE_HEAD : 0);
check_class_changed(rq, p, prev_class, oldprio);
+out_unlock:
__task_rq_unlock(rq);
}
-
#endif
-
void set_user_nice(struct task_struct *p, long nice)
{
int old_prio, delta, on_rq;
on_rq = p->on_rq;
running = task_current(rq, p);
if (on_rq)
- deactivate_task(rq, p, 0);
+ dequeue_task(rq, p, 0);
if (running)
p->sched_class->put_prev_task(rq, p);
if (running)
p->sched_class->set_curr_task(rq);
if (on_rq)
- activate_task(rq, p, 0);
+ enqueue_task(rq, p, 0);
check_class_changed(rq, p, prev_class, oldprio);
task_rq_unlock(rq, p, &flags);
__release(rq->lock);
spin_release(&rq->lock.dep_map, 1, _THIS_IP_);
do_raw_spin_unlock(&rq->lock);
- preempt_enable_no_resched();
+ sched_preempt_enable_no_resched();
schedule();
/**
* yield - yield the current processor to other threads.
*
- * This is a shortcut for kernel-space yielding - it marks the
- * thread runnable and calls sys_sched_yield().
+ * Do not ever use this function, there's a 99% chance you're doing it wrong.
+ *
+ * The scheduler is at all times free to pick the calling task as the most
+ * eligible task to run, if removing the yield() call from your code breaks
+ * it, its already broken.
+ *
+ * Typical broken usage is:
+ *
+ * while (!event)
+ * yield();
+ *
+ * where one assumes that yield() will let 'the other' process run that will
+ * make event true. If the current task is a SCHED_FIFO task that will never
+ * happen. Never use yield() as a progress guarantee!!
+ *
+ * If you want to use yield() to wait for something, use wait_event().
+ * If you want to use yield() to be 'nice' for others, use cond_resched().
+ * If you still want to use yield(), do not!
*/
void __sched yield(void)
{
* placed properly.
*/
if (p->on_rq) {
- deactivate_task(rq_src, p, 0);
+ dequeue_task(rq_src, p, 0);
set_task_cpu(p, dest_cpu);
- activate_task(rq_dest, p, 0);
+ enqueue_task(rq_dest, p, 0);
check_preempt_curr(rq_dest, p, 0);
}
done:
unsigned long action, void *hcpu)
{
switch (action & ~CPU_TASKS_FROZEN) {
- case CPU_ONLINE:
+ case CPU_STARTING:
case CPU_DOWN_FAILED:
set_cpu_active((long)hcpu, true);
return NOTIFY_OK;
*
* Also keep a unique ID per domain (we use the first cpu number in
* the cpumask of the domain), this allows us to quickly tell if
- * two cpus are in the same cache domain, see ttwu_share_cache().
+ * two cpus are in the same cache domain, see cpus_share_cache().
*/
DEFINE_PER_CPU(struct sched_domain *, sd_llc);
DEFINE_PER_CPU(int, sd_llc_id);
rq->online = 0;
rq->idle_stamp = 0;
rq->avg_idle = 2*sysctl_sched_migration_cost;
+
+ INIT_LIST_HEAD(&rq->cfs_tasks);
+
rq_attach_root(rq, &def_root_domain);
#ifdef CONFIG_NO_HZ
rq->nohz_flags = 0;
on_rq = p->on_rq;
if (on_rq)
- deactivate_task(rq, p, 0);
+ dequeue_task(rq, p, 0);
__setscheduler(rq, p, SCHED_NORMAL, 0);
if (on_rq) {
- activate_task(rq, p, 0);
+ enqueue_task(rq, p, 0);
resched_task(rq->curr);
}
struct task_group, css);
}
- static struct cgroup_subsys_state *
- cpu_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cgrp)
+ static struct cgroup_subsys_state *cpu_cgroup_create(struct cgroup *cgrp)
{
struct task_group *tg, *parent;
return &tg->css;
}
- static void
- cpu_cgroup_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp)
+ static void cpu_cgroup_destroy(struct cgroup *cgrp)
{
struct task_group *tg = cgroup_tg(cgrp);
sched_destroy_group(tg);
}
- static int cpu_cgroup_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
+ static int cpu_cgroup_can_attach(struct cgroup *cgrp,
struct cgroup_taskset *tset)
{
struct task_struct *task;
return 0;
}
- static void cpu_cgroup_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
+ static void cpu_cgroup_attach(struct cgroup *cgrp,
struct cgroup_taskset *tset)
{
struct task_struct *task;
}
static void
- cpu_cgroup_exit(struct cgroup_subsys *ss, struct cgroup *cgrp,
- struct cgroup *old_cgrp, struct task_struct *task)
+ cpu_cgroup_exit(struct cgroup *cgrp, struct cgroup *old_cgrp,
+ struct task_struct *task)
{
/*
* cgroup_exit() is called in the copy_process() failure path.
*/
/* create a new cpu accounting group */
- static struct cgroup_subsys_state *cpuacct_create(
- struct cgroup_subsys *ss, struct cgroup *cgrp)
+ static struct cgroup_subsys_state *cpuacct_create(struct cgroup *cgrp)
{
struct cpuacct *ca;
}
/* destroy an existing cpu accounting group */
- static void
- cpuacct_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp)
+ static void cpuacct_destroy(struct cgroup *cgrp)
{
struct cpuacct *ca = cgroup_ca(cgrp);
* the counter to account for memory usage
*/
struct res_counter res;
- /*
- * the counter to account for mem+swap usage.
- */
- struct res_counter memsw;
+
+ union {
+ /*
+ * the counter to account for mem+swap usage.
+ */
+ struct res_counter memsw;
+
+ /*
+ * rcu_freeing is used only when freeing struct mem_cgroup,
+ * so put it into a union to avoid wasting more memory.
+ * It must be disjoint from the css field. It could be
+ * in a union with the res field, but res plays a much
+ * larger part in mem_cgroup life than memsw, and might
+ * be of interest, even at time of free, when debugging.
+ * So share rcu_head with the less interesting memsw.
+ */
+ struct rcu_head rcu_freeing;
+ /*
+ * But when using vfree(), that cannot be done at
+ * interrupt time, so we must then queue the work.
+ */
+ struct work_struct work_freeing;
+ };
+
/*
* Per cgroup active and inactive list, similar to the
* per zone LRU lists.
static bool mem_cgroup_is_root(struct mem_cgroup *memcg);
void sock_update_memcg(struct sock *sk)
{
- if (static_branch(&memcg_socket_limit_enabled)) {
+ if (mem_cgroup_sockets_enabled) {
struct mem_cgroup *memcg;
BUG_ON(!sk->sk_prot->proto_cgroup);
void sock_release_memcg(struct sock *sk)
{
- if (static_branch(&memcg_socket_limit_enabled) && sk->sk_cgrp) {
+ if (mem_cgroup_sockets_enabled && sk->sk_cgrp) {
struct mem_cgroup *memcg;
WARN_ON(!sk->sk_cgrp->memcg);
memcg = sk->sk_cgrp->memcg;
/* threshold event is triggered in finer grain than soft limit */
if (unlikely(mem_cgroup_event_ratelimit(memcg,
MEM_CGROUP_TARGET_THRESH))) {
- bool do_softlimit, do_numainfo;
+ bool do_softlimit;
+ bool do_numainfo __maybe_unused;
do_softlimit = mem_cgroup_event_ratelimit(memcg,
MEM_CGROUP_TARGET_SOFTLIMIT);
pc = lookup_page_cgroup(page);
memcg = pc->mem_cgroup;
+
+ /*
+ * Surreptitiously switch any uncharged page to root:
+ * an uncharged page off lru does nothing to secure
+ * its former mem_cgroup from sudden removal.
+ *
+ * Our caller holds lru_lock, and PageCgroupUsed is updated
+ * under page_cgroup lock: between them, they make all uses
+ * of pc->mem_cgroup safe.
+ */
+ if (!PageCgroupUsed(pc) && memcg != root_mem_cgroup)
+ pc->mem_cgroup = memcg = root_mem_cgroup;
+
mz = page_cgroup_zoneinfo(memcg, page);
/* compound_order() is stabilized through lru_lock */
MEM_CGROUP_ZSTAT(mz, lru) += 1 << compound_order(page);
struct page *page,
unsigned int nr_pages,
struct page_cgroup *pc,
- enum charge_type ctype)
+ enum charge_type ctype,
+ bool lrucare)
{
+ struct zone *uninitialized_var(zone);
+ bool was_on_lru = false;
+
lock_page_cgroup(pc);
if (unlikely(PageCgroupUsed(pc))) {
unlock_page_cgroup(pc);
* we don't need page_cgroup_lock about tail pages, becase they are not
* accessed by any other context at this point.
*/
+
+ /*
+ * In some cases, SwapCache and FUSE(splice_buf->radixtree), the page
+ * may already be on some other mem_cgroup's LRU. Take care of it.
+ */
+ if (lrucare) {
+ zone = page_zone(page);
+ spin_lock_irq(&zone->lru_lock);
+ if (PageLRU(page)) {
+ ClearPageLRU(page);
+ del_page_from_lru_list(zone, page, page_lru(page));
+ was_on_lru = true;
+ }
+ }
+
pc->mem_cgroup = memcg;
/*
* We access a page_cgroup asynchronously without lock_page_cgroup().
break;
}
+ if (lrucare) {
+ if (was_on_lru) {
+ VM_BUG_ON(PageLRU(page));
+ SetPageLRU(page);
+ add_page_to_lru_list(zone, page, page_lru(page));
+ }
+ spin_unlock_irq(&zone->lru_lock);
+ }
+
mem_cgroup_charge_statistics(memcg, PageCgroupCache(pc), nr_pages);
unlock_page_cgroup(pc);
- WARN_ON_ONCE(PageLRU(page));
+
/*
* "charge_statistics" updated event counter. Then, check it.
* Insert ancestor (and ancestor's ancestors), to softlimit RB-tree.
ret = __mem_cgroup_try_charge(mm, gfp_mask, nr_pages, &memcg, oom);
if (ret == -ENOMEM)
return ret;
- __mem_cgroup_commit_charge(memcg, page, nr_pages, pc, ctype);
+ __mem_cgroup_commit_charge(memcg, page, nr_pages, pc, ctype, false);
return 0;
}
__mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr,
enum charge_type ctype);
-static void
-__mem_cgroup_commit_charge_lrucare(struct page *page, struct mem_cgroup *memcg,
- enum charge_type ctype)
-{
- struct page_cgroup *pc = lookup_page_cgroup(page);
- struct zone *zone = page_zone(page);
- unsigned long flags;
- bool removed = false;
-
- /*
- * In some case, SwapCache, FUSE(splice_buf->radixtree), the page
- * is already on LRU. It means the page may on some other page_cgroup's
- * LRU. Take care of it.
- */
- spin_lock_irqsave(&zone->lru_lock, flags);
- if (PageLRU(page)) {
- del_page_from_lru_list(zone, page, page_lru(page));
- ClearPageLRU(page);
- removed = true;
- }
- __mem_cgroup_commit_charge(memcg, page, 1, pc, ctype);
- if (removed) {
- add_page_to_lru_list(zone, page, page_lru(page));
- SetPageLRU(page);
- }
- spin_unlock_irqrestore(&zone->lru_lock, flags);
- return;
-}
-
int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask)
{
__mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *memcg,
enum charge_type ctype)
{
+ struct page_cgroup *pc;
+
if (mem_cgroup_disabled())
return;
if (!memcg)
return;
cgroup_exclude_rmdir(&memcg->css);
- __mem_cgroup_commit_charge_lrucare(page, memcg, ctype);
+ pc = lookup_page_cgroup(page);
+ __mem_cgroup_commit_charge(memcg, page, 1, pc, ctype, true);
/*
* Now swap is on-memory. This means this page may be
* counted both as mem and swap....double count.
batch->memcg = NULL;
}
-/*
- * A function for resetting pc->mem_cgroup for newly allocated pages.
- * This function should be called if the newpage will be added to LRU
- * before start accounting.
- */
-void mem_cgroup_reset_owner(struct page *newpage)
-{
- struct page_cgroup *pc;
-
- if (mem_cgroup_disabled())
- return;
-
- pc = lookup_page_cgroup(newpage);
- VM_BUG_ON(PageCgroupUsed(pc));
- pc->mem_cgroup = root_mem_cgroup;
-}
-
#ifdef CONFIG_SWAP
/*
* called after __delete_from_swap_cache() and drop "page" account.
ctype = MEM_CGROUP_CHARGE_TYPE_CACHE;
else
ctype = MEM_CGROUP_CHARGE_TYPE_SHMEM;
- __mem_cgroup_commit_charge(memcg, page, 1, pc, ctype);
+ __mem_cgroup_commit_charge(memcg, newpage, 1, pc, ctype, false);
return ret;
}
* the newpage may be on LRU(or pagevec for LRU) already. We lock
* LRU while we overwrite pc->mem_cgroup.
*/
- __mem_cgroup_commit_charge_lrucare(newpage, memcg, type);
+ __mem_cgroup_commit_charge(memcg, newpage, 1, pc, type, true);
}
#ifdef CONFIG_DEBUG_VM
*/
BUG_ON(!thresholds);
+ if (!thresholds->primary)
+ goto unlock;
+
usage = mem_cgroup_usage(memcg, type == _MEMSWAP);
/* Check if a threshold crossed before removing */
/* To be sure that nobody uses thresholds */
synchronize_rcu();
-
+unlock:
mutex_unlock(&memcg->thresholds_lock);
}
return mem_cgroup_sockets_init(cont, ss);
};
- static void kmem_cgroup_destroy(struct cgroup_subsys *ss,
- struct cgroup *cont)
+ static void kmem_cgroup_destroy(struct cgroup *cont)
{
- mem_cgroup_sockets_destroy(cont, ss);
+ mem_cgroup_sockets_destroy(cont);
}
#else
static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss)
return 0;
}
- static void kmem_cgroup_destroy(struct cgroup_subsys *ss,
- struct cgroup *cont)
+ static void kmem_cgroup_destroy(struct cgroup *cont)
{
}
#endif
return NULL;
}
+/*
+ * Helpers for freeing a vzalloc()ed mem_cgroup by RCU,
+ * but in process context. The work_freeing structure is overlaid
+ * on the rcu_freeing structure, which itself is overlaid on memsw.
+ */
+static void vfree_work(struct work_struct *work)
+{
+ struct mem_cgroup *memcg;
+
+ memcg = container_of(work, struct mem_cgroup, work_freeing);
+ vfree(memcg);
+}
+static void vfree_rcu(struct rcu_head *rcu_head)
+{
+ struct mem_cgroup *memcg;
+
+ memcg = container_of(rcu_head, struct mem_cgroup, rcu_freeing);
+ INIT_WORK(&memcg->work_freeing, vfree_work);
+ schedule_work(&memcg->work_freeing);
+}
+
/*
* At destroying mem_cgroup, references from swap_cgroup can remain.
* (scanning all at force_empty is too costly...)
free_percpu(memcg->stat);
if (sizeof(struct mem_cgroup) < PAGE_SIZE)
- kfree(memcg);
+ kfree_rcu(memcg, rcu_freeing);
else
- vfree(memcg);
+ call_rcu(&memcg->rcu_freeing, vfree_rcu);
}
static void mem_cgroup_get(struct mem_cgroup *memcg)
}
static struct cgroup_subsys_state * __ref
- mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
+ mem_cgroup_create(struct cgroup *cont)
{
struct mem_cgroup *memcg, *parent;
long error = -ENOMEM;
return ERR_PTR(error);
}
- static int mem_cgroup_pre_destroy(struct cgroup_subsys *ss,
- struct cgroup *cont)
+ static int mem_cgroup_pre_destroy(struct cgroup *cont)
{
struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
return mem_cgroup_force_empty(memcg, false);
}
- static void mem_cgroup_destroy(struct cgroup_subsys *ss,
- struct cgroup *cont)
+ static void mem_cgroup_destroy(struct cgroup *cont)
{
struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
- kmem_cgroup_destroy(ss, cont);
+ kmem_cgroup_destroy(cont);
mem_cgroup_put(memcg);
}
mem_cgroup_end_move(from);
}
- static int mem_cgroup_can_attach(struct cgroup_subsys *ss,
- struct cgroup *cgroup,
- struct cgroup_taskset *tset)
+ static int mem_cgroup_can_attach(struct cgroup *cgroup,
+ struct cgroup_taskset *tset)
{
struct task_struct *p = cgroup_taskset_first(tset);
int ret = 0;
return ret;
}
- static void mem_cgroup_cancel_attach(struct cgroup_subsys *ss,
- struct cgroup *cgroup,
- struct cgroup_taskset *tset)
+ static void mem_cgroup_cancel_attach(struct cgroup *cgroup,
+ struct cgroup_taskset *tset)
{
mem_cgroup_clear_mc();
}
up_read(&mm->mmap_sem);
}
- static void mem_cgroup_move_task(struct cgroup_subsys *ss,
- struct cgroup *cont,
- struct cgroup_taskset *tset)
+ static void mem_cgroup_move_task(struct cgroup *cont,
+ struct cgroup_taskset *tset)
{
struct task_struct *p = cgroup_taskset_first(tset);
struct mm_struct *mm = get_task_mm(p);
mem_cgroup_clear_mc();
}
#else /* !CONFIG_MMU */
- static int mem_cgroup_can_attach(struct cgroup_subsys *ss,
- struct cgroup *cgroup,
- struct cgroup_taskset *tset)
+ static int mem_cgroup_can_attach(struct cgroup *cgroup,
+ struct cgroup_taskset *tset)
{
return 0;
}
- static void mem_cgroup_cancel_attach(struct cgroup_subsys *ss,
- struct cgroup *cgroup,
- struct cgroup_taskset *tset)
+ static void mem_cgroup_cancel_attach(struct cgroup *cgroup,
+ struct cgroup_taskset *tset)
{
}
- static void mem_cgroup_move_task(struct cgroup_subsys *ss,
- struct cgroup *cont,
- struct cgroup_taskset *tset)
+ static void mem_cgroup_move_task(struct cgroup *cont,
+ struct cgroup_taskset *tset)
{
}
#endif
#include <net/sock.h>
#include <net/netprio_cgroup.h>
- static struct cgroup_subsys_state *cgrp_create(struct cgroup_subsys *ss,
- struct cgroup *cgrp);
- static void cgrp_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp);
+ static struct cgroup_subsys_state *cgrp_create(struct cgroup *cgrp);
+ static void cgrp_destroy(struct cgroup *cgrp);
static int cgrp_populate(struct cgroup_subsys *ss, struct cgroup *cgrp);
struct cgroup_subsys net_prio_subsys = {
spin_lock_irqsave(&prioidx_map_lock, flags);
prioidx = find_first_zero_bit(prioidx_map, sizeof(unsigned long) * PRIOIDX_SZ);
+ if (prioidx == sizeof(unsigned long) * PRIOIDX_SZ) {
+ spin_unlock_irqrestore(&prioidx_map_lock, flags);
+ return -ENOSPC;
+ }
set_bit(prioidx, prioidx_map);
spin_unlock_irqrestore(&prioidx_map_lock, flags);
- if (prioidx == sizeof(unsigned long) * PRIOIDX_SZ)
- return -ENOSPC;
-
atomic_set(&max_prioidx, prioidx);
*prio = prioidx;
return 0;
static void update_netdev_tables(void)
{
struct net_device *dev;
- u32 max_len = atomic_read(&max_prioidx);
+ u32 max_len = atomic_read(&max_prioidx) + 1;
struct netprio_map *map;
rtnl_lock();
rtnl_unlock();
}
- static struct cgroup_subsys_state *cgrp_create(struct cgroup_subsys *ss,
- struct cgroup *cgrp)
+ static struct cgroup_subsys_state *cgrp_create(struct cgroup *cgrp)
{
struct cgroup_netprio_state *cs;
int ret;
return &cs->css;
}
- static void cgrp_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp)
+ static void cgrp_destroy(struct cgroup *cgrp)
{
struct cgroup_netprio_state *cs;
struct net_device *dev;
{
struct net_device *dev = ptr;
struct netprio_map *old;
- u32 max_len = atomic_read(&max_prioidx);
/*
* Note this is called with rtnl_lock held so we have update side
*/
switch (event) {
-
- case NETDEV_REGISTER:
- if (max_len)
- extend_netdev_table(dev, max_len);
- break;
case NETDEV_UNREGISTER:
old = rtnl_dereference(dev->priomap);
RCU_INIT_POINTER(dev->priomap, NULL);
#include <linux/init.h>
#include <linux/highmem.h>
#include <linux/user_namespace.h>
-#include <linux/jump_label.h>
+#include <linux/static_key.h>
#include <linux/memcontrol.h>
#include <asm/uaccess.h>
out:
list_for_each_entry_continue_reverse(proto, &proto_list, node)
if (proto->destroy_cgroup)
- proto->destroy_cgroup(cgrp, ss);
+ proto->destroy_cgroup(cgrp);
mutex_unlock(&proto_list_mutex);
return ret;
}
- void mem_cgroup_sockets_destroy(struct cgroup *cgrp, struct cgroup_subsys *ss)
+ void mem_cgroup_sockets_destroy(struct cgroup *cgrp)
{
struct proto *proto;
mutex_lock(&proto_list_mutex);
list_for_each_entry_reverse(proto, &proto_list, node)
if (proto->destroy_cgroup)
- proto->destroy_cgroup(cgrp, ss);
+ proto->destroy_cgroup(cgrp);
mutex_unlock(&proto_list_mutex);
}
#endif
static struct lock_class_key af_family_keys[AF_MAX];
static struct lock_class_key af_family_slock_keys[AF_MAX];
-struct jump_label_key memcg_socket_limit_enabled;
+struct static_key memcg_socket_limit_enabled;
EXPORT_SYMBOL(memcg_socket_limit_enabled);
/*
void sock_update_netprioidx(struct sock *sk)
{
- struct cgroup_netprio_state *state;
if (in_interrupt())
return;
- rcu_read_lock();
- state = task_netprio_state(current);
- sk->sk_cgrp_prioidx = state ? state->prioidx : 0;
- rcu_read_unlock();
+
+ sk->sk_cgrp_prioidx = task_netprioidx(current);
}
EXPORT_SYMBOL_GPL(sock_update_netprioidx);
#endif
/* Alas. Undo changes. */
sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
- sk_memory_allocated_sub(sk, amt, parent_status);
+ sk_memory_allocated_sub(sk, amt);
return 0;
}
void __sk_mem_reclaim(struct sock *sk)
{
sk_memory_allocated_sub(sk,
- sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT, 0);
+ sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT);
sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
if (sk_under_memory_pressure(sk) &&
}
EXPORT_SYMBOL(tcp_init_cgroup);
- void tcp_destroy_cgroup(struct cgroup *cgrp, struct cgroup_subsys *ss)
+ void tcp_destroy_cgroup(struct cgroup *cgrp)
{
struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
struct cg_proto *cg_proto;
val = res_counter_read_u64(&tcp->tcp_memory_allocated, RES_LIMIT);
if (val != RESOURCE_MAX)
- jump_label_dec(&memcg_socket_limit_enabled);
+ static_key_slow_dec(&memcg_socket_limit_enabled);
}
EXPORT_SYMBOL(tcp_destroy_cgroup);
net->ipv4.sysctl_tcp_mem[i]);
if (val == RESOURCE_MAX && old_lim != RESOURCE_MAX)
- jump_label_dec(&memcg_socket_limit_enabled);
+ static_key_slow_dec(&memcg_socket_limit_enabled);
else if (old_lim == RESOURCE_MAX && val != RESOURCE_MAX)
- jump_label_inc(&memcg_socket_limit_enabled);
+ static_key_slow_inc(&memcg_socket_limit_enabled);
return 0;
}
projects / ~andy / linux / commitdiff