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Date: Thu, 9 Oct 2008 09:42:28 +0900 (JST) From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> To: righi.andrea@...il.com Cc: kosaki.motohiro@...fujitsu.com, Randy Dunlap <randy.dunlap@...cle.com>, Michael Kerrisk <mtk.manpages@...il.com>, Peter Zijlstra <peterz@...radead.org>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, Andrew Morton <akpm@...ux-foundation.org>, Michael Rubin <mrubin@...gle.com>, linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] 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@...il.com> looks good to me. > --- > Documentation/filesystems/proc.txt | 11 ++++++----- > 1 files changed, 6 insertions(+), 5 deletions(-) > > diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt > index f566ad9..be69c8b 100644 > --- a/Documentation/filesystems/proc.txt > +++ b/Documentation/filesystems/proc.txt > @@ -1380,15 +1380,16 @@ causes the kernel to prefer to reclaim dentries and inodes. > dirty_background_ratio > ---------------------- > > -Contains, as a percentage of total system memory, the number of pages at which > -the pdflush background writeback daemon will start writing out dirty data. > +Contains, as a percentage of the dirtyable system memory (free pages + > +reclaimable pages), the number of pages at which the pdflush background > +writeback daemon will start writing out dirty data. > > dirty_ratio > ----------------- > > -Contains, as a percentage of total system memory, the number of pages at which > -a process which is generating disk writes will itself start writing out dirty > -data. > +Contains, as a percentage of the dirtyable system memory (free pages + > +reclaimable pages), the number of pages at which a process which is generating > +disk writes will itself start writing out dirty data. > > dirty_writeback_centisecs > ------------------------- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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