From: Christoph Lameter <clameter@sgi.com>
To: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Cc: linux-mm <linux-mm@kvack.org>
Subject: Re: [RFC] Don't set/test/wait-for radix tree tags if no capability
Date: Wed, 13 Sep 2006 13:51:51 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0609131350030.19101@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <1158176114.5328.52.camel@localhost>
On Wed, 13 Sep 2006, Lee Schermerhorn wrote:
> While debugging a problem [in the out-of-tree migration cache], I
> noticed a lot of radix-tree tag activity for address spaces that have
> the BDI_CAP_NO_{ACCT_DIRTY|WRITEBACK} capability flags set--effectively
> disabling these capabilities--in their backing device. Altho'
> functionally benign, I believe that this unnecessary overhead. Seeking
> contrary opinions.
I do not think that not wanting accounting for dirty pages means that we
should not mark those dirty. If we do this then filesystems will
not be able to find the dirty pags for writeout.
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next prev parent reply other threads:[~2006-09-13 20:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-13 19:35 Lee Schermerhorn
2006-09-13 20:51 ` Christoph Lameter [this message]
2006-09-13 22:12 ` Lee Schermerhorn
2006-09-14 15:23 ` Hugh Dickins
2006-09-14 15:52 ` Lee Schermerhorn
2006-09-14 16:20 ` Hugh Dickins
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