Further update of the i386 boot documentation

[~andy/linux] / Documentation / sysctl / vm.txt

diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
index 20d0d797f539ce51d18f903aa4aec942ead16643..1d192565e18207188cc93b54d962dd7d5974d7bb 100644 (file)
--- a/Documentation/sysctl/vm.txt
+++ b/Documentation/sysctl/vm.txt
@@ -129,7 +129,7 @@ the high water marks for each per cpu page list.
 
 zone_reclaim_mode:
 
-Zone_reclaim_mode allows to set more or less agressive approaches to
+Zone_reclaim_mode allows someone to set more or less aggressive approaches to
 reclaim memory when a zone runs out of memory. If it is set to zero then no
 zone reclaim occurs. Allocations will be satisfied from other zones / nodes
 in the system.
@@ -197,11 +197,22 @@ and may not be fast.
 
 panic_on_oom
 
-This enables or disables panic on out-of-memory feature.  If this is set to 1,
-the kernel panics when out-of-memory happens.  If this is set to 0, the kernel
-will kill some rogue process, called oom_killer.  Usually, oom_killer can kill
-rogue processes and system will survive.  If you want to panic the system
-rather than killing rogue processes, set this to 1.
+This enables or disables panic on out-of-memory feature.
 
-The default value is 0.
+If this is set to 0, the kernel will kill some rogue process,
+called oom_killer.  Usually, oom_killer can kill rogue processes and
+system will survive.
+
+If this is set to 1, the kernel panics when out-of-memory happens.
+However, if a process limits using nodes by mempolicy/cpusets,
+and those nodes become memory exhaustion status, one process
+may be killed by oom-killer. No panic occurs in this case.
+Because other nodes' memory may be free. This means system total status
+may be not fatal yet.
 
+If this is set to 2, the kernel panics compulsorily even on the
+above-mentioned.
+
+The default value is 0.
+1 and 2 are for failover of clustering. Please select either
+according to your policy of failover.