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| author | Jeff Garzik <jgarzik@pobox.com> | 2006-01-26 22:19:57 -0500 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@pobox.com> | 2006-01-26 22:19:57 -0500 |
| commit | 97309d1a0bbdcb0813ea08574b4473d8e5416012 (patch) | |
| tree | 0dcbcf5aa5146147e0ac1d0c4b73b868a67d333b /Documentation/sysctl/vm.txt | |
| parent | b4ea75b649417606fd6b38710a2962ec9770e772 (diff) | |
| parent | efd51b5c6798d103e3aa683464aebb2019b62119 (diff) | |
Merge branch 'upstream-fixes'
Diffstat (limited to 'Documentation/sysctl/vm.txt')
| -rw-r--r-- | Documentation/sysctl/vm.txt | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt index 6910c0136f8..391dd64363e 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. + |