gfp_t gfp_mask);
struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *);
-struct lruvec *mem_cgroup_lru_add_list(struct zone *, struct page *,
- enum lru_list);
-void mem_cgroup_lru_del_list(struct page *, enum lru_list);
-struct lruvec *mem_cgroup_lru_move_lists(struct zone *, struct page *,
- enum lru_list, enum lru_list);
+struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *);
/* For coalescing uncharge for reducing memcg' overhead*/
extern void mem_cgroup_uncharge_start(void);
int mem_cgroup_inactive_file_is_low(struct lruvec *lruvec);
int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list);
-struct zone_reclaim_stat*
-mem_cgroup_get_reclaim_stat_from_page(struct page *page);
+void mem_cgroup_update_lru_size(struct lruvec *, enum lru_list, int);
extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
struct task_struct *p);
extern void mem_cgroup_replace_page_cache(struct page *oldpage,
return &zone->lruvec;
}
-static inline struct lruvec *mem_cgroup_lru_add_list(struct zone *zone,
- struct page *page,
- enum lru_list lru)
-{
- return &zone->lruvec;
-}
-
-static inline void mem_cgroup_lru_del_list(struct page *page, enum lru_list lru)
-{
-}
-
-static inline struct lruvec *mem_cgroup_lru_move_lists(struct zone *zone,
- struct page *page,
- enum lru_list from,
- enum lru_list to)
+static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
+ struct zone *zone)
{
return &zone->lruvec;
}
return 0;
}
-static inline struct zone_reclaim_stat*
-mem_cgroup_get_reclaim_stat_from_page(struct page *page)
+static inline void
+mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
+ int increment)
{
- return NULL;
}
static inline void
return !PageSwapBacked(page);
}
-static __always_inline void
-add_page_to_lru_list(struct zone *zone, struct page *page, enum lru_list lru)
+static __always_inline void add_page_to_lru_list(struct page *page,
+ struct lruvec *lruvec, enum lru_list lru)
{
- struct lruvec *lruvec;
-
- lruvec = mem_cgroup_lru_add_list(zone, page, lru);
+ int nr_pages = hpage_nr_pages(page);
+ mem_cgroup_update_lru_size(lruvec, lru, nr_pages);
list_add(&page->lru, &lruvec->lists[lru]);
- __mod_zone_page_state(zone, NR_LRU_BASE + lru, hpage_nr_pages(page));
+ __mod_zone_page_state(lruvec_zone(lruvec), NR_LRU_BASE + lru, nr_pages);
}
-static __always_inline void
-del_page_from_lru_list(struct zone *zone, struct page *page, enum lru_list lru)
+static __always_inline void del_page_from_lru_list(struct page *page,
+ struct lruvec *lruvec, enum lru_list lru)
{
- mem_cgroup_lru_del_list(page, lru);
+ int nr_pages = hpage_nr_pages(page);
+ mem_cgroup_update_lru_size(lruvec, lru, -nr_pages);
list_del(&page->lru);
- __mod_zone_page_state(zone, NR_LRU_BASE + lru, -hpage_nr_pages(page));
+ __mod_zone_page_state(lruvec_zone(lruvec), NR_LRU_BASE + lru, -nr_pages);
}
/**
/* linux/mm/swap.c */
extern void __lru_cache_add(struct page *, enum lru_list lru);
extern void lru_cache_add_lru(struct page *, enum lru_list lru);
-extern void lru_add_page_tail(struct zone* zone,
- struct page *page, struct page *page_tail);
+extern void lru_add_page_tail(struct page *page, struct page *page_tail,
+ struct lruvec *lruvec);
extern void activate_page(struct page *);
extern void mark_page_accessed(struct page *);
extern void lru_add_drain(void);
unsigned long nr_scanned = 0, nr_isolated = 0;
struct list_head *migratelist = &cc->migratepages;
isolate_mode_t mode = 0;
+ struct lruvec *lruvec;
/*
* Ensure that there are not too many pages isolated from the LRU
if (cc->mode != COMPACT_SYNC)
mode |= ISOLATE_ASYNC_MIGRATE;
+ lruvec = mem_cgroup_page_lruvec(page, zone);
+
/* Try isolate the page */
if (__isolate_lru_page(page, mode) != 0)
continue;
VM_BUG_ON(PageTransCompound(page));
/* Successfully isolated */
- del_page_from_lru_list(zone, page, page_lru(page));
+ del_page_from_lru_list(page, lruvec, page_lru(page));
list_add(&page->lru, migratelist);
cc->nr_migratepages++;
nr_isolated++;
{
int i;
struct zone *zone = page_zone(page);
+ struct lruvec *lruvec;
int tail_count = 0;
/* prevent PageLRU to go away from under us, and freeze lru stats */
spin_lock_irq(&zone->lru_lock);
+ lruvec = mem_cgroup_page_lruvec(page, zone);
+
compound_lock(page);
/* complete memcg works before add pages to LRU */
mem_cgroup_split_huge_fixup(page);
BUG_ON(!PageDirty(page_tail));
BUG_ON(!PageSwapBacked(page_tail));
-
- lru_add_page_tail(zone, page, page_tail);
+ lru_add_page_tail(page, page_tail, lruvec);
}
atomic_sub(tail_count, &page->_count);
BUG_ON(atomic_read(&page->_count) <= 0);
- __dec_zone_page_state(page, NR_ANON_TRANSPARENT_HUGEPAGES);
+ __mod_zone_page_state(zone, NR_ANON_TRANSPARENT_HUGEPAGES, -1);
__mod_zone_page_state(zone, NR_ANON_PAGES, HPAGE_PMD_NR);
ClearPageCompound(page);
/**
* mem_cgroup_zone_lruvec - get the lru list vector for a zone and memcg
* @zone: zone of the wanted lruvec
- * @mem: memcg of the wanted lruvec
+ * @memcg: memcg of the wanted lruvec
*
* Returns the lru list vector holding pages for the given @zone and
* @mem. This can be the global zone lruvec, if the memory controller
*/
/**
- * mem_cgroup_lru_add_list - account for adding an lru page and return lruvec
- * @zone: zone of the page
+ * mem_cgroup_page_lruvec - return lruvec for adding an lru page
* @page: the page
- * @lru: current lru
- *
- * This function accounts for @page being added to @lru, and returns
- * the lruvec for the given @zone and the memcg @page is charged to.
- *
- * The callsite is then responsible for physically linking the page to
- * the returned lruvec->lists[@lru].
+ * @zone: zone of the page
*/
-struct lruvec *mem_cgroup_lru_add_list(struct zone *zone, struct page *page,
- enum lru_list lru)
+struct lruvec *mem_cgroup_page_lruvec(struct page *page, struct zone *zone)
{
struct mem_cgroup_per_zone *mz;
struct mem_cgroup *memcg;
memcg = pc->mem_cgroup;
/*
- * Surreptitiously switch any uncharged page to root:
+ * Surreptitiously switch any uncharged offlist page to root:
* an uncharged page off lru does nothing to secure
* its former mem_cgroup from sudden removal.
*
* under page_cgroup lock: between them, they make all uses
* of pc->mem_cgroup safe.
*/
- if (!PageCgroupUsed(pc) && memcg != root_mem_cgroup)
+ if (!PageLRU(page) && !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 */
- mz->lru_size[lru] += 1 << compound_order(page);
return &mz->lruvec;
}
/**
- * mem_cgroup_lru_del_list - account for removing an lru page
- * @page: the page
- * @lru: target lru
+ * mem_cgroup_update_lru_size - account for adding or removing an lru page
+ * @lruvec: mem_cgroup per zone lru vector
+ * @lru: index of lru list the page is sitting on
+ * @nr_pages: positive when adding or negative when removing
*
- * This function accounts for @page being removed from @lru.
- *
- * The callsite is then responsible for physically unlinking
- * @page->lru.
+ * This function must be called when a page is added to or removed from an
+ * lru list.
*/
-void mem_cgroup_lru_del_list(struct page *page, enum lru_list lru)
+void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
+ int nr_pages)
{
struct mem_cgroup_per_zone *mz;
- struct mem_cgroup *memcg;
- struct page_cgroup *pc;
+ unsigned long *lru_size;
if (mem_cgroup_disabled())
return;
- pc = lookup_page_cgroup(page);
- memcg = pc->mem_cgroup;
- VM_BUG_ON(!memcg);
- mz = page_cgroup_zoneinfo(memcg, page);
- /* huge page split is done under lru_lock. so, we have no races. */
- VM_BUG_ON(mz->lru_size[lru] < (1 << compound_order(page)));
- mz->lru_size[lru] -= 1 << compound_order(page);
-}
-
-/**
- * mem_cgroup_lru_move_lists - account for moving a page between lrus
- * @zone: zone of the page
- * @page: the page
- * @from: current lru
- * @to: target lru
- *
- * This function accounts for @page being moved between the lrus @from
- * and @to, and returns the lruvec for the given @zone and the memcg
- * @page is charged to.
- *
- * The callsite is then responsible for physically relinking
- * @page->lru to the returned lruvec->lists[@to].
- */
-struct lruvec *mem_cgroup_lru_move_lists(struct zone *zone,
- struct page *page,
- enum lru_list from,
- enum lru_list to)
-{
- /* XXX: Optimize this, especially for @from == @to */
- mem_cgroup_lru_del_list(page, from);
- return mem_cgroup_lru_add_list(zone, page, to);
+ mz = container_of(lruvec, struct mem_cgroup_per_zone, lruvec);
+ lru_size = mz->lru_size + lru;
+ *lru_size += nr_pages;
+ VM_BUG_ON((long)(*lru_size) < 0);
}
/*
return (active > inactive);
}
-struct zone_reclaim_stat *
-mem_cgroup_get_reclaim_stat_from_page(struct page *page)
-{
- struct page_cgroup *pc;
- struct mem_cgroup_per_zone *mz;
-
- if (mem_cgroup_disabled())
- return NULL;
-
- pc = lookup_page_cgroup(page);
- if (!PageCgroupUsed(pc))
- return NULL;
- /* Ensure pc->mem_cgroup is visible after reading PCG_USED. */
- smp_rmb();
- mz = page_cgroup_zoneinfo(pc->mem_cgroup, page);
- return &mz->lruvec.reclaim_stat;
-}
-
#define mem_cgroup_from_res_counter(counter, member) \
container_of(counter, struct mem_cgroup, member)
{
struct page_cgroup *pc = lookup_page_cgroup(page);
struct zone *uninitialized_var(zone);
+ struct lruvec *lruvec;
bool was_on_lru = false;
bool anon;
zone = page_zone(page);
spin_lock_irq(&zone->lru_lock);
if (PageLRU(page)) {
+ lruvec = mem_cgroup_zone_lruvec(zone, pc->mem_cgroup);
ClearPageLRU(page);
- del_page_from_lru_list(zone, page, page_lru(page));
+ del_page_from_lru_list(page, lruvec, page_lru(page));
was_on_lru = true;
}
}
if (lrucare) {
if (was_on_lru) {
+ lruvec = mem_cgroup_zone_lruvec(zone, pc->mem_cgroup);
VM_BUG_ON(PageLRU(page));
SetPageLRU(page);
- add_page_to_lru_list(zone, page, page_lru(page));
+ add_page_to_lru_list(page, lruvec, page_lru(page));
}
spin_unlock_irq(&zone->lru_lock);
}
static void __page_cache_release(struct page *page)
{
if (PageLRU(page)) {
- unsigned long flags;
struct zone *zone = page_zone(page);
+ struct lruvec *lruvec;
+ unsigned long flags;
spin_lock_irqsave(&zone->lru_lock, flags);
+ lruvec = mem_cgroup_page_lruvec(page, zone);
VM_BUG_ON(!PageLRU(page));
__ClearPageLRU(page);
- del_page_from_lru_list(zone, page, page_off_lru(page));
+ del_page_from_lru_list(page, lruvec, page_off_lru(page));
spin_unlock_irqrestore(&zone->lru_lock, flags);
}
}
EXPORT_SYMBOL(put_pages_list);
static void pagevec_lru_move_fn(struct pagevec *pvec,
- void (*move_fn)(struct page *page, void *arg),
- void *arg)
+ void (*move_fn)(struct page *page, struct lruvec *lruvec, void *arg),
+ void *arg)
{
int i;
struct zone *zone = NULL;
+ struct lruvec *lruvec;
unsigned long flags = 0;
for (i = 0; i < pagevec_count(pvec); i++) {
spin_lock_irqsave(&zone->lru_lock, flags);
}
- (*move_fn)(page, arg);
+ lruvec = mem_cgroup_page_lruvec(page, zone);
+ (*move_fn)(page, lruvec, arg);
}
if (zone)
spin_unlock_irqrestore(&zone->lru_lock, flags);
pagevec_reinit(pvec);
}
-static void pagevec_move_tail_fn(struct page *page, void *arg)
+static void pagevec_move_tail_fn(struct page *page, struct lruvec *lruvec,
+ void *arg)
{
int *pgmoved = arg;
if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
enum lru_list lru = page_lru_base_type(page);
- struct lruvec *lruvec;
-
- lruvec = mem_cgroup_lru_move_lists(page_zone(page),
- page, lru, lru);
list_move_tail(&page->lru, &lruvec->lists[lru]);
(*pgmoved)++;
}
}
}
-static void update_page_reclaim_stat(struct zone *zone, struct page *page,
+static void update_page_reclaim_stat(struct lruvec *lruvec,
int file, int rotated)
{
- struct zone_reclaim_stat *reclaim_stat;
-
- reclaim_stat = mem_cgroup_get_reclaim_stat_from_page(page);
- if (!reclaim_stat)
- reclaim_stat = &zone->lruvec.reclaim_stat;
+ struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat;
reclaim_stat->recent_scanned[file]++;
if (rotated)
reclaim_stat->recent_rotated[file]++;
}
-static void __activate_page(struct page *page, void *arg)
+static void __activate_page(struct page *page, struct lruvec *lruvec,
+ void *arg)
{
- struct zone *zone = page_zone(page);
-
if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
int file = page_is_file_cache(page);
int lru = page_lru_base_type(page);
- del_page_from_lru_list(zone, page, lru);
+ del_page_from_lru_list(page, lruvec, lru);
SetPageActive(page);
lru += LRU_ACTIVE;
- add_page_to_lru_list(zone, page, lru);
- __count_vm_event(PGACTIVATE);
+ add_page_to_lru_list(page, lruvec, lru);
- update_page_reclaim_stat(zone, page, file, 1);
+ __count_vm_event(PGACTIVATE);
+ update_page_reclaim_stat(lruvec, file, 1);
}
}
struct zone *zone = page_zone(page);
spin_lock_irq(&zone->lru_lock);
- __activate_page(page, NULL);
+ __activate_page(page, mem_cgroup_page_lruvec(page, zone), NULL);
spin_unlock_irq(&zone->lru_lock);
}
#endif
void add_page_to_unevictable_list(struct page *page)
{
struct zone *zone = page_zone(page);
+ struct lruvec *lruvec;
spin_lock_irq(&zone->lru_lock);
+ lruvec = mem_cgroup_page_lruvec(page, zone);
SetPageUnevictable(page);
SetPageLRU(page);
- add_page_to_lru_list(zone, page, LRU_UNEVICTABLE);
+ add_page_to_lru_list(page, lruvec, LRU_UNEVICTABLE);
spin_unlock_irq(&zone->lru_lock);
}
* be write it out by flusher threads as this is much more effective
* than the single-page writeout from reclaim.
*/
-static void lru_deactivate_fn(struct page *page, void *arg)
+static void lru_deactivate_fn(struct page *page, struct lruvec *lruvec,
+ void *arg)
{
int lru, file;
bool active;
- struct zone *zone = page_zone(page);
if (!PageLRU(page))
return;
return;
active = PageActive(page);
-
file = page_is_file_cache(page);
lru = page_lru_base_type(page);
- del_page_from_lru_list(zone, page, lru + active);
+
+ del_page_from_lru_list(page, lruvec, lru + active);
ClearPageActive(page);
ClearPageReferenced(page);
- add_page_to_lru_list(zone, page, lru);
+ add_page_to_lru_list(page, lruvec, lru);
if (PageWriteback(page) || PageDirty(page)) {
/*
*/
SetPageReclaim(page);
} else {
- struct lruvec *lruvec;
/*
* The page's writeback ends up during pagevec
* We moves tha page into tail of inactive.
*/
- lruvec = mem_cgroup_lru_move_lists(zone, page, lru, lru);
list_move_tail(&page->lru, &lruvec->lists[lru]);
__count_vm_event(PGROTATED);
}
if (active)
__count_vm_event(PGDEACTIVATE);
- update_page_reclaim_stat(zone, page, file, 0);
+ update_page_reclaim_stat(lruvec, file, 0);
}
/*
int i;
LIST_HEAD(pages_to_free);
struct zone *zone = NULL;
+ struct lruvec *lruvec;
unsigned long uninitialized_var(flags);
for (i = 0; i < nr; i++) {
zone = pagezone;
spin_lock_irqsave(&zone->lru_lock, flags);
}
+
+ lruvec = mem_cgroup_page_lruvec(page, zone);
VM_BUG_ON(!PageLRU(page));
__ClearPageLRU(page);
- del_page_from_lru_list(zone, page, page_off_lru(page));
+ del_page_from_lru_list(page, lruvec, page_off_lru(page));
}
list_add(&page->lru, &pages_to_free);
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
/* used by __split_huge_page_refcount() */
-void lru_add_page_tail(struct zone* zone,
- struct page *page, struct page *page_tail)
+void lru_add_page_tail(struct page *page, struct page *page_tail,
+ struct lruvec *lruvec)
{
int uninitialized_var(active);
enum lru_list lru;
VM_BUG_ON(!PageHead(page));
VM_BUG_ON(PageCompound(page_tail));
VM_BUG_ON(PageLRU(page_tail));
- VM_BUG_ON(NR_CPUS != 1 && !spin_is_locked(&zone->lru_lock));
+ VM_BUG_ON(NR_CPUS != 1 &&
+ !spin_is_locked(&lruvec_zone(lruvec)->lru_lock));
SetPageLRU(page_tail);
* Use the standard add function to put page_tail on the list,
* but then correct its position so they all end up in order.
*/
- add_page_to_lru_list(zone, page_tail, lru);
+ add_page_to_lru_list(page_tail, lruvec, lru);
list_head = page_tail->lru.prev;
list_move_tail(&page_tail->lru, list_head);
}
if (!PageUnevictable(page))
- update_page_reclaim_stat(zone, page_tail, file, active);
+ update_page_reclaim_stat(lruvec, file, active);
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
-static void __pagevec_lru_add_fn(struct page *page, void *arg)
+static void __pagevec_lru_add_fn(struct page *page, struct lruvec *lruvec,
+ void *arg)
{
enum lru_list lru = (enum lru_list)arg;
- struct zone *zone = page_zone(page);
int file = is_file_lru(lru);
int active = is_active_lru(lru);
SetPageLRU(page);
if (active)
SetPageActive(page);
- add_page_to_lru_list(zone, page, lru);
- update_page_reclaim_stat(zone, page, file, active);
+ add_page_to_lru_list(page, lruvec, lru);
+ update_page_reclaim_stat(lruvec, file, active);
}
/*
for (scan = 0; scan < nr_to_scan && !list_empty(src); scan++) {
struct page *page;
+ int nr_pages;
page = lru_to_page(src);
prefetchw_prev_lru_page(page, src, flags);
switch (__isolate_lru_page(page, mode)) {
case 0:
- mem_cgroup_lru_del_list(page, lru);
+ nr_pages = hpage_nr_pages(page);
+ mem_cgroup_update_lru_size(lruvec, lru, -nr_pages);
list_move(&page->lru, dst);
- nr_taken += hpage_nr_pages(page);
+ nr_taken += nr_pages;
break;
case -EBUSY:
if (PageLRU(page)) {
struct zone *zone = page_zone(page);
+ struct lruvec *lruvec;
spin_lock_irq(&zone->lru_lock);
+ lruvec = mem_cgroup_page_lruvec(page, zone);
if (PageLRU(page)) {
int lru = page_lru(page);
- ret = 0;
get_page(page);
ClearPageLRU(page);
-
- del_page_from_lru_list(zone, page, lru);
+ del_page_from_lru_list(page, lruvec, lru);
+ ret = 0;
}
spin_unlock_irq(&zone->lru_lock);
}
spin_lock_irq(&zone->lru_lock);
continue;
}
+
+ lruvec = mem_cgroup_page_lruvec(page, zone);
+
SetPageLRU(page);
lru = page_lru(page);
- add_page_to_lru_list(zone, page, lru);
+ add_page_to_lru_list(page, lruvec, lru);
+
if (is_active_lru(lru)) {
int file = is_file_lru(lru);
int numpages = hpage_nr_pages(page);
if (put_page_testzero(page)) {
__ClearPageLRU(page);
__ClearPageActive(page);
- del_page_from_lru_list(zone, page, lru);
+ del_page_from_lru_list(page, lruvec, lru);
if (unlikely(PageCompound(page))) {
spin_unlock_irq(&zone->lru_lock);
* But we had to alter page->flags anyway.
*/
-static void move_active_pages_to_lru(struct zone *zone,
+static void move_active_pages_to_lru(struct lruvec *lruvec,
struct list_head *list,
struct list_head *pages_to_free,
enum lru_list lru)
{
+ struct zone *zone = lruvec_zone(lruvec);
unsigned long pgmoved = 0;
struct page *page;
+ int nr_pages;
while (!list_empty(list)) {
- struct lruvec *lruvec;
-
page = lru_to_page(list);
+ lruvec = mem_cgroup_page_lruvec(page, zone);
VM_BUG_ON(PageLRU(page));
SetPageLRU(page);
- lruvec = mem_cgroup_lru_add_list(zone, page, lru);
+ nr_pages = hpage_nr_pages(page);
+ mem_cgroup_update_lru_size(lruvec, lru, nr_pages);
list_move(&page->lru, &lruvec->lists[lru]);
- pgmoved += hpage_nr_pages(page);
+ pgmoved += nr_pages;
if (put_page_testzero(page)) {
__ClearPageLRU(page);
__ClearPageActive(page);
- del_page_from_lru_list(zone, page, lru);
+ del_page_from_lru_list(page, lruvec, lru);
if (unlikely(PageCompound(page))) {
spin_unlock_irq(&zone->lru_lock);
*/
reclaim_stat->recent_rotated[file] += nr_rotated;
- move_active_pages_to_lru(zone, &l_active, &l_hold, lru);
- move_active_pages_to_lru(zone, &l_inactive, &l_hold, lru - LRU_ACTIVE);
+ move_active_pages_to_lru(lruvec, &l_active, &l_hold, lru);
+ move_active_pages_to_lru(lruvec, &l_inactive, &l_hold, lru - LRU_ACTIVE);
__mod_zone_page_state(zone, NR_ISOLATED_ANON + file, -nr_taken);
spin_unlock_irq(&zone->lru_lock);
zone = pagezone;
spin_lock_irq(&zone->lru_lock);
}
+ lruvec = mem_cgroup_page_lruvec(page, zone);
if (!PageLRU(page) || !PageUnevictable(page))
continue;
VM_BUG_ON(PageActive(page));
ClearPageUnevictable(page);
- __dec_zone_state(zone, NR_UNEVICTABLE);
- lruvec = mem_cgroup_lru_move_lists(zone, page,
- LRU_UNEVICTABLE, lru);
- list_move(&page->lru, &lruvec->lists[lru]);
- __inc_zone_state(zone, NR_INACTIVE_ANON + lru);
+ del_page_from_lru_list(page, lruvec, LRU_UNEVICTABLE);
+ add_page_to_lru_list(page, lruvec, lru);
pgrescued++;
}
}
projects / ~andy / linux / commitdiff