linux-kernel - Re: [patch 3/3][rfc] vmscan: batched swap slot allocation

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Message-Id: <20090421182427.F14D.A69D9226@jp.fujitsu.com>
Date:	Tue, 21 Apr 2009 18:27:08 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	kosaki.motohiro@...fujitsu.com,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Rik van Riel <riel@...hat.com>,
	Hugh Dickins <hugh@...itas.com>
Subject: Re: [patch 3/3][rfc] vmscan: batched swap slot allocation

> > > -		cond_resched();
> > > +		if (list_empty(&swap_pages))
> > > +			cond_resched();
> > >  
> > Why this ?
> 
> It shouldn't schedule anymore when it's allocated the first swap slot.
> Another reclaimer could e.g. sleep on the cond_resched() before the
> loop and when we schedule while having swap slots allocated, we might
> continue further allocations multiple slots ahead.

Oops, It seems regression. this cond_resched() intent to

cond_resched();
pageout();
cond_resched();
pageout();
cond_resched();
pageout();



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