From 24950898ffd161f2ea67c60f398146457bca8bf0 Mon Sep 17 00:00:00 2001 From: Pavel Machek Date: Tue, 16 Oct 2007 23:31:28 -0700 Subject: [PATCH] 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Documentation/sysctl/vm.txt | 6 ++++++ 1 file changed, 6 insertions(+) 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