linux-kernel - Re: [PATCH 01/45] writeback: reduce calls to global_page_state in balance_dirty

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Message-ID: <20091009154759.GJ7654@duck.suse.cz>
Date:	Fri, 9 Oct 2009 17:47:59 +0200
From:	Jan Kara <jack@...e.cz>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Jan Kara <jack@...e.cz>, Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>,
	Christoph Hellwig <hch@...radead.org>,
	Dave Chinner <david@...morbit.com>,
	Chris Mason <chris.mason@...cle.com>,
	Li Shaohua <shaohua.li@...el.com>,
	Myklebust Trond <Trond.Myklebust@...app.com>,
	"jens.axboe@...cle.com" <jens.axboe@...cle.com>,
	Nick Piggin <npiggin@...e.de>, linux-fsdevel@...r.kernel.org,
	Richard Kennedy <richard@....demon.co.uk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/45] writeback: reduce calls to global_page_state in
	balance_dirty_pages()

On Fri 09-10-09 17:18:32, Peter Zijlstra wrote:
> On Fri, 2009-10-09 at 17:12 +0200, Jan Kara wrote:
> >   Ugh, but this is not equivalent! We would block the writer on some BDI
> > without any dirty data if we are over global dirty limit. That didn't
> > happen before.
> 
> It should have, we should throttle everything calling
> balance_dirty_pages() when we're over the total limit.
  OK :) I agree it's reasonable. But Wu, please note this in the
changelog because it might be a substantial change for some loads.

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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