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authorPavel Machek <pavel@ucw.cz>2007-10-16 23:31:28 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-17 08:43:06 -0700
commit24950898ffd161f2ea67c60f398146457bca8bf0 (patch)
tree72cba3a2cc85bfc7c7b5c4eb22342fbd8b77e7c4
parentf4e875704d8ebf0323235e635e666432f097ae42 (diff)
vm.txt: document min_free_pages as critical for correctness
min_free_pages is critical for correctness, document it as such. Signed-off-by: Pavel Machek <pavel@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--Documentation/sysctl/vm.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
index 17346da636e..b89570c3043 100644
--- a/Documentation/sysctl/vm.txt
+++ b/Documentation/sysctl/vm.txt
@@ -112,6 +112,12 @@ of kilobytes free. The VM uses this number to compute a pages_min
value for each lowmem zone in the system. Each lowmem zone gets
a number of reserved free pages based proportionally on its size.
+Some minimal ammount of memory is needed to satisfy PF_MEMALLOC
+allocations; if you set this to lower than 1024KB, your system will
+become subtly broken, and prone to deadlock under high loads.
+
+Setting this too high will OOM your machine instantly.
+
==============================================================
percpu_pagelist_fraction