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-rw-r--r--Documentation/sysctl/vm.txt14
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
index 34a5fece3121..720355cbdf45 100644
--- a/Documentation/sysctl/vm.txt
+++ b/Documentation/sysctl/vm.txt
@@ -57,6 +57,7 @@ Currently, these files are in /proc/sys/vm:
- panic_on_oom
- percpu_pagelist_fraction
- stat_interval
+- stat_refresh
- swappiness
- user_reserve_kbytes
- vfs_cache_pressure
@@ -755,6 +756,19 @@ is 1 second.
==============================================================
+stat_refresh
+
+Any read or write (by root only) flushes all the per-cpu vm statistics
+into their global totals, for more accurate reports when testing
+e.g. cat /proc/sys/vm/stat_refresh /proc/meminfo
+
+As a side-effect, it also checks for negative totals (elsewhere reported
+as 0) and "fails" with EINVAL if any are found, with a warning in dmesg.
+(At time of writing, a few stats are known sometimes to be found negative,
+with no ill effects: errors and warnings on these stats are suppressed.)
+
+==============================================================
+
swappiness
This control is used to define how aggressive the kernel will swap