Messages in this thread Patch in this message | | | From | Mel Gorman <> | Subject | [PATCH 2/2] mm: Fix documentation of min_unmapped_ratio | Date | Mon, 15 Jun 2009 12:14:42 +0100 |
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Kosaki Motohiro pointed out that the documentation for min_unmapped_ratio no longer matches the implementation. This patch updates the documentation.
This patch can be merged with vmscan-properly-account-for-the-number-of-page-cache-pages-zone_reclaim-can-re claim.patch .
Signed-off-by: Mel Gorman <mel@csn.ul.ie> --- Documentation/sysctl/vm.txt | 12 ++++++++---- 1 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt index 0ea5adb..c4de635 100644 --- a/Documentation/sysctl/vm.txt +++ b/Documentation/sysctl/vm.txt @@ -315,10 +315,14 @@ min_unmapped_ratio: This is available only on NUMA kernels. -A percentage of the total pages in each zone. Zone reclaim will only -occur if more than this percentage of pages are file backed and unmapped. -This is to insure that a minimal amount of local pages is still available for -file I/O even if the node is overallocated. +This is a percentage of the total pages in each zone. Zone reclaim will +only occur if more than this percentage of pages are in a state that +zone_reclaim_mode allows to be reclaimed. + +If zone_reclaim_mode has the value 4 OR'd, then the percentage is compared +against all file-backed unmapped pages including swapcache pages and tmpfs +files. Otherwise, only unmapped pages backed by normal files but not tmpfs +files and similar are considered. The default is 1 percent. -- 1.5.6.5
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