linux-kernel - Re: per-bdi-throttling: synchronous writepage doesn't work correctly

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Message-Id: <1193938770.27652.328.camel@twins>
Date:	Thu, 01 Nov 2007 18:39:30 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	jdike@...toit.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: per-bdi-throttling: synchronous writepage doesn't work
	correctly

On Thu, 2007-11-01 at 18:28 +0100, Miklos Szeredi wrote:
> > The page not having PG_writeback set on return is a hint, but not fool
> > proof, it could be the device is just blazing fast.
> 
> Hmm, does it actually has to be foolproof though?  What will happen if
> bdi_writeout_inc() is called twice for the page?  The device will get
> twice the number of pages it deserves?  That's not all that bad,
> especially since that is a really really fast device.

Basically, yes.

But then again, that would require auditing all ->writepage() callsites.



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