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mm: replace hardcoded 3% with admin_reserve_pages knob

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Add an admin_reserve_kbytes knob to allow admins to change the hardcoded
memory reserve to something other than 3%, which may be multiple
gigabytes on large memory systems.  Only about 8MB is necessary to
enable recovery in the default mode, and only a few hundred MB are
required even when overcommit is disabled.

This affects OVERCOMMIT_GUESS and OVERCOMMIT_NEVER.

admin_reserve_kbytes is initialized to min(3% free pages, 8MB)

I arrived at 8MB by summing the RSS of sshd or login, bash, and top.

Please see first patch in this series for full background, motivation,
testing, and full changelog.

[akpm@linux-foundation.org: coding-style fixes]
[akpm@linux-foundation.org: make init_admin_reserve() static]
Signed-off-by: Andrew Shewmaker <agshew@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrew Shewmaker
2013-04-29 15:08:11 -07:00
committed by Linus Torvalds
parent c9b1d0981f
commit 4eeab4f558
5 changed files with 90 additions and 8 deletions
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1
include/linux/mm.h
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@@ -45,6 +45,7 @@ extern int sysctl_legacy_va_layout;
#include <asm/processor.h>
extern unsigned long sysctl_user_reserve_kbytes;
extern unsigned long sysctl_admin_reserve_kbytes;
#define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))