linux-kernel - Re: [RFC][PATCH] PM: Force GFP_NOIO during suspend/resume (was: Re: [linux-pm] Memory allocations in .suspend became very unreliable)

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Message-Id: <20100122103830.6C09.A69D9226@jp.fujitsu.com>
Date:	Fri, 22 Jan 2010 10:42:12 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com, "Rafael J. Wysocki" <rjw@...k.pl>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	linux-pm@...ts.linux-foundation.org,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC][PATCH] PM: Force GFP_NOIO during suspend/resume (was: Re: [linux-pm] Memory allocations in .suspend became very unreliable)

> > > Probably we have multiple option. but I don't think GFP_NOIO is good
> > > option. It assume the system have lots non-dirty cache memory and it isn't
> > > guranteed.
> > 
> > Basically nothing is guaranteed in this case.  However, does it actually make
> > things _worse_?  
> 
> Hmm..
> Do you mean we don't need to prevent accidental suspend failure?
> Perhaps, I did misunderstand your intention. If you think your patch solve
> this this issue, I still disagree. but If you think your patch mitigate
> the pain of this issue, I agree it. I don't have any reason to oppose your
> first patch.

One question. Have anyone tested Rafael's $subject patch? 
Please post test result. if the issue disapper by the patch, we can
suppose the slowness is caused by i/o layer.



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