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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <201001202213.23373.rjw@sisk.pl>
Date:	Wed, 20 Jan 2010 22:13:23 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	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>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [RFC][PATCH] PM: Force GFP_NOIO during suspend/resume (was: Re: [linux-pm] Memory allocations in .suspend became very unreliable)

On Wednesday 20 January 2010, Oliver Neukum wrote:
> Am Dienstag, 19. Januar 2010 21:37:35 schrieb Rafael J. Wysocki:
> > That said, Maxim reported that in his test case the mm subsystem apparently
> > attempted to use I/O even if there was a plenty of free memory available and
> > I'd like prevent that from happening.
> 
> Hi,
> 
> it seems to me that this is caused by the mm subsytem maintaing
> a share of clean pages precisely so that GFP_NOIO will work.
> Perhaps it is a good idea to
> a) launder a number of pages if the system is about to be suspended
> between the freezer and notifying drivers

That was tried, didn't work.

> b) set the ration of clean pages to dirty pages to 0 while suspending
> the system.

Patch, please?

Rafael
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/