linux-kernel - Re: [PATCHv4 17/17] writeback: lessen sync

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Message-ID: <20100527090859.GB31073@ZenIV.linux.org.uk>
Date:	Thu, 27 May 2010 10:08:59 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Artem Bityutskiy <dedekind1@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCHv4 17/17] writeback: lessen sync_supers wakeup count

On Thu, May 27, 2010 at 05:22:40PM +1000, Nick Piggin wrote:
> Yeah, we definitely don't want to add global cacheline writes in the
> common case. Also I don't know why you do the strange -1 value. I
> couldn't seem to find where you defined bdi_arm_supers_timer();

bdi_arm_supers_timer() is in the mainline; basically, it's "schedule
timer that'll wake sync_supers_tsk in $INTERVAL from now".
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