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-rw-r--r--Documentation/sysctl/vm.txt17
1 files changed, 17 insertions, 0 deletions
diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
index 89ba1a42a17d..6910c0136f8d 100644
--- a/Documentation/sysctl/vm.txt
+++ b/Documentation/sysctl/vm.txt
@@ -103,3 +103,20 @@ This is used to force the Linux VM to keep a minimum number
of kilobytes free. The VM uses this number to compute a pages_min
value for each lowmem zone in the system. Each lowmem zone gets
a number of reserved free pages based proportionally on its size.
+
+==============================================================
+
+percpu_pagelist_fraction
+
+This is the fraction of pages at most (high mark pcp->high) in each zone that
+are allocated for each per cpu page list. The min value for this is 8. It
+means that we don't allow more than 1/8th of pages in each zone to be
+allocated in any single per_cpu_pagelist. This entry only changes the value
+of hot per cpu pagelists. User can specify a number like 100 to allocate
+1/100th of each zone to each per cpu page list.
+
+The batch value of each per cpu pagelist is also updated as a result. It is
+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.