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Date: Wed, 4 Aug 2010 11:26:29 +0900 From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> Cc: "Rafael J. Wysocki" <rjw@...k.pl>, Hugh Dickins <hughd@...gle.com>, KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>, Ondrej Zary <linux@...nbow-software.org>, Kernel development list <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>, Balbir Singh <balbir@...ibm.com>, Andrea Arcangeli <aarcange@...hat.com> Subject: Re: [RFC][PATCH -mm] hibernation: freeze swap at hibernation (Was Re: Memory corruption during hibernation since 2.6.31 On Wed, 4 Aug 2010 08:31:19 +0900 KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote: > On Wed, 4 Aug 2010 01:09:15 +0200 > "Rafael J. Wysocki" <rjw@...k.pl> wrote: > > > On Monday, August 02, 2010, KAMEZAWA Hiroyuki wrote: > > > On Fri, 30 Jul 2010 13:14:32 +0900 > > > KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote: > > > > > > > On Thu, 29 Jul 2010 21:10:10 -0700 > > > > Hugh Dickins <hughd@...gle.com> wrote: > > > > > > > > > On Thu, Jul 29, 2010 at 5:01 PM, KAMEZAWA Hiroyuki > > > > > <kamezawa.hiroyu@...fujitsu.com> wrote: > > > > > > > > > > > I think the best way is kexec(). But maybe rollback from hibernation failure > > > > > > will be difficult. Considering how crash-dump works well and under maintainance > > > > > > by many enterprise guys, hibernation-by-kexec is a choice. I think. It can make > > > > > > reuse of kdump code, ...or, hibernation-resume code can eat kdump image > > > > > > directly. Maybe the problem will be the speed of dump. > > > > > > > > > > I've no appetite for a total rework of hibernation, and I don't see > > > > > how that would > > > > > address the issue: I'm just looking for some protection against swap > > > > > reuse danger. > > > > > > > > > Okay ;) (And I forget that kexec has to prepare memory at boot time for 2nd kernel. > > > > It will be harmful for small device guys.) > > > > > > > > I'll prepare a routine not-quick-fix. > > > > > > Ok, here. Passed easy tests as > > > # echo disk > /sys/power/state > > > Sorry, I found this patch is of no use. I should put hibernate_free_swap() before hibernation_snapshot(). I'll retry. Thanks, -Kame -- 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/
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