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-rw-r--r--Documentation/sysctl/vm.txt12
1 files changed, 8 insertions, 4 deletions
diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
index 0ea5adbc5b16..c4de6359d440 100644
--- a/Documentation/sysctl/vm.txt
+++ b/Documentation/sysctl/vm.txt
@@ -315,10 +315,14 @@ min_unmapped_ratio:
315 315
316This is available only on NUMA kernels. 316This is available only on NUMA kernels.
317 317
318A percentage of the total pages in each zone. Zone reclaim will only 318This is a percentage of the total pages in each zone. Zone reclaim will
319occur if more than this percentage of pages are file backed and unmapped. 319only occur if more than this percentage of pages are in a state that
320This is to insure that a minimal amount of local pages is still available for 320zone_reclaim_mode allows to be reclaimed.
321file I/O even if the node is overallocated. 321
322If zone_reclaim_mode has the value 4 OR'd, then the percentage is compared
323against all file-backed unmapped pages including swapcache pages and tmpfs
324files. Otherwise, only unmapped pages backed by normal files but not tmpfs
325files and similar are considered.
322 326
323The default is 1 percent. 327The default is 1 percent.
324 328