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Commit a10726bb authored by Rabin Vincent's avatar Rabin Vincent Committed by Jonathan Corbet
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Documentation: mm: fix location of extfrag_index 



/proc/extfrag_index does not exist.  This file is in debugfs.  Fix the
description of extfrag_threshold to reflect this.

Signed-off-by: default avatarRabin Vincent <rabin.vincent@axis.com>
Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
parent acc068d9

Documentation/sysctl/vm.txt

+5 −5
Original line number Diff line number Diff line
@@ -225,11 +225,11 @@ with your system. To disable them, echo 4 (bit 3) into drop_caches. 
extfrag_threshold



This parameter affects whether the kernel will compact memory or direct

reclaim to satisfy a high-order allocation. /proc/extfrag_index shows what

the fragmentation index for each order is in each zone in the system. Values

tending towards 0 imply allocations would fail due to lack of memory,

values towards 1000 imply failures are due to fragmentation and -1 implies

that the allocation will succeed as long as watermarks are met.

reclaim to satisfy a high-order allocation. The extfrag/extfrag_index file in

debugfs shows what the fragmentation index for each order is in each zone in

the system. Values tending towards 0 imply allocations would fail due to lack

of memory, values towards 1000 imply failures are due to fragmentation and -1

implies that the allocation will succeed as long as watermarks are met.



The kernel will not compact memory in a zone if the

fragmentation index is <= extfrag_threshold. The default value is 500.