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

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Date:	Thu, 01 Nov 2007 18:28:49 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	a.p.zijlstra@...llo.nl
CC:	jdike@...toit.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: per-bdi-throttling: synchronous writepage doesn't work
	correctly

> 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.

Miklos
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