linux-kernel - Re: [PATCH v2 01/16] FS: Added demand paging markers to filesystem

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Message-ID: <20120509150343.GB14916@infradead.org>
Date:	Wed, 9 May 2012 11:03:43 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Arnd Bergmann <arnd.bergmann@...aro.org>
Cc:	Dave Chinner <david@...morbit.com>,
	"S, Venkatraman" <svenkatr@...com>, linux-mmc@...r.kernel.org,
	cjb@...top.org, linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	alex.lemberg@...disk.com, ilan.smith@...disk.com,
	lporzio@...ron.com, rmk+kernel@....linux.org.uk
Subject: Re: [PATCH v2 01/16] FS: Added demand paging markers to filesystem

On Wed, May 09, 2012 at 01:59:40PM +0000, Arnd Bergmann wrote:
> My feeling is that we should just treat every (REQ_SYNC | REQ_READ)
> request the same and let them interrupt long-running writes,
> independent of whether it's REQ_META or demand paging.

It's funny that the CFQ scheduler used to boost metadata reads that
have REQ_META set - in fact it still does for those filesystems using
the now split out REQ_PRIO.

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