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[PATCH] Zone reclaim: proc override

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proc support for zone reclaim

This patch creates a proc entry /proc/sys/vm/zone_reclaim_mode that may be
used to override the automatic determination of the zone reclaim made on
bootup.

Signed-off-by: Christoph Lameter <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Christoph Lameter 2006-01-18 17:42:32 -08:00 • committed by Linus Torvalds
commit 1743660b91
3 changed files with 30 additions and 0 deletions
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18
Documentation/sysctl/vm.txt
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@ -27,6 +27,7 @@ Currently, these files are in /proc/sys/vm:
- laptop_mode
- block_dump
- drop-caches
- zone_reclaim_mode
==============================================================
@ -120,3 +121,20 @@ set to pcp->high/4. The upper limit of batch is (PAGE_SHIFT * 8)
The initial value is zero. Kernel does not use this value at boot time to set
the high water marks for each per cpu page list.
===============================================================
zone_reclaim_mode:
This is set during bootup to 1 if it is determined that pages from
remote zones will cause a significant performance reduction. The
page allocator will then reclaim easily reusable pages (those page
cache pages that are currently not used) before going off node.
The user can override this setting. It may be beneficial to switch
off zone reclaim if the system is used for a file server and all
of memory should be used for caching files from disk.
It may be beneficial to switch this on if one wants to do zone
reclaim regardless of the numa distances in the system.