diff options
author | Christoph Lameter <clameter@sgi.com> | 2006-01-18 17:42:32 -0800 |
---|---|---|
committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-18 19:20:17 -0800 |
commit | 1743660b911bfb849b1fb33830522254561b9f9b (patch) | |
tree | 82bfd84f534e7a571667916f90e2492c7148cbac | |
parent | 9eeff2395e3cfd05c9b2e6074ff943a34b0c5c21 (diff) | |
download | kernel_samsung_smdk4412-1743660b911bfb849b1fb33830522254561b9f9b.zip kernel_samsung_smdk4412-1743660b911bfb849b1fb33830522254561b9f9b.tar.gz kernel_samsung_smdk4412-1743660b911bfb849b1fb33830522254561b9f9b.tar.bz2 |
[PATCH] Zone reclaim: proc override
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 <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r-- | Documentation/sysctl/vm.txt | 18 | ||||
-rw-r--r-- | include/linux/sysctl.h | 1 | ||||
-rw-r--r-- | kernel/sysctl.c | 11 |
3 files changed, 30 insertions, 0 deletions
diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt index 6910c01..391dd64 100644 --- a/Documentation/sysctl/vm.txt +++ b/Documentation/sysctl/vm.txt @@ -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. + diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h index 7f47212..8352a7c 100644 --- a/include/linux/sysctl.h +++ b/include/linux/sysctl.h @@ -182,6 +182,7 @@ enum VM_SWAP_TOKEN_TIMEOUT=28, /* default time for token time out */ VM_DROP_PAGECACHE=29, /* int: nuke lots of pagecache */ VM_PERCPU_PAGELIST_FRACTION=30,/* int: fraction of pages in each percpu_pagelist */ + VM_ZONE_RECLAIM_MODE=31,/* reclaim local zone memory before going off node */ }; diff --git a/kernel/sysctl.c b/kernel/sysctl.c index f5d69b6..cb99a42 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -870,6 +870,17 @@ static ctl_table vm_table[] = { .strategy = &sysctl_jiffies, }, #endif +#ifdef CONFIG_NUMA + { + .ctl_name = VM_ZONE_RECLAIM_MODE, + .procname = "zone_reclaim_mode", + .data = &zone_reclaim_mode, + .maxlen = sizeof(zone_reclaim_mode), + .mode = 0644, + .proc_handler = &proc_dointvec, + .strategy = &zero, + }, +#endif { .ctl_name = 0 } }; |