documentation: clarify dirty_ratio and dirty_background_ratio description
authorAndrea Righi <righi.andrea@gmail.com>
Sun, 19 Oct 2008 03:27:13 +0000 (20:27 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Mon, 20 Oct 2008 15:52:32 +0000 (08:52 -0700)
commit7a6560e02556b6f0a798c247f3a557c523d9701b
tree7c1ded3e016e8604deb0cfb3b2d85389a8ae106e
parent9f1b16a51ea7180eca8a0d76a6bd587385a30757
documentation: clarify dirty_ratio and dirty_background_ratio description

The current documentation of dirty_ratio and dirty_background_ratio is a
bit misleading.

In the documentation we say that they are "a percentage of total system
memory", but the current page writeback policy, intead, is to apply the
percentages to the dirtyable memory, that means free pages + reclaimable
pages.

Better to be more explicit to clarify this concept.

Signed-off-by: Andrea Righi <righi.andrea@gmail.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Documentation/filesystems/proc.txt