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authorAndrew Shewmaker <agshew@gmail.com>2013-04-29 15:08:11 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-04-29 15:54:36 -0700
commit4eeab4f5580d11bffedc697684b91b0bca0d5009 (patch)
tree4e9a0c010d34e786df52225039a17aa38e9adf17 /Documentation/leds
parentc9b1d0981fcce3d9976d7b7a56e4e0503bc610dd (diff)
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mm: replace hardcoded 3% with admin_reserve_pages knob
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>
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