X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=Documentation%2Fsysctl%2Fvm.txt;h=7cee90223d3a0624296b42d983d786b25462dc56;hb=46009c8bcd5d7c9fcbfc17d0455a471bea5be4d4;hp=2dc246af4885caf69b05d4010a14ee8b685244ab;hpb=c0897856553d45aee1780bed455b7c2e888dd64b;p=linux-2.6

diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
index 2dc246af48..7cee90223d 100644
--- a/Documentation/sysctl/vm.txt
+++ b/Documentation/sysctl/vm.txt
@@ -28,7 +28,7 @@ Currently, these files are in /proc/sys/vm:
 - block_dump
 - drop-caches
 - zone_reclaim_mode
-- zone_reclaim_interval
+- min_unmapped_ratio
 - panic_on_oom
 
 ==============================================================
@@ -167,17 +167,18 @@ use of files and builds up large slab caches. However, the slab
 shrink operation is global, may take a long time and free slabs
 in all nodes of the system.
 
-================================================================
+=============================================================
 
-zone_reclaim_interval:
+min_unmapped_ratio:
 
-The time allowed for off node allocations after zone reclaim
-has failed to reclaim enough pages to allow a local allocation.
+This is available only on NUMA kernels.
 
-Time is set in seconds and set by default to 30 seconds.
+A percentage of the file backed 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.
 
-Reduce the interval if undesired off node allocations occur. However, too
-frequent scans will have a negative impact onoff node allocation performance.
+The default is 1 percent.
 
 =============================================================