Messages in this thread | | | Date | Wed, 28 Sep 2011 07:09:18 -0700 (PDT) | From | Dan Magenheimer <> | Subject | RE: [PATCH V10 0/6] mm: frontswap: overview (and proposal to merge at next window) |
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> From: KAMEZAWA Hiroyuki [mailto:kamezawa.hiroyu@jp.fujitsu.com] > Sent: Wednesday, September 28, 2011 12:16 AM > To: Dan Magenheimer > Cc: linux-kernel@vger.kernel.org; linux-mm@kvack.org; jeremy@goop.org; hughd@google.com; > ngupta@vflare.org; Konrad Wilk; JBeulich@novell.com; Kurt Hackel; npiggin@kernel.dk; akpm@linux- > foundation.org; riel@redhat.com; hannes@cmpxchg.org; matthew@wil.cx; Chris Mason; > sjenning@linux.vnet.ibm.com; jackdachef@gmail.com; cyclonusj@gmail.com; levinsasha928@gmail.com > Subject: Re: [PATCH V10 0/6] mm: frontswap: overview (and proposal to merge at next window) > > On Thu, 15 Sep 2011 14:33:05 -0700 > Dan Magenheimer <dan.magenheimer@oracle.com> wrote: > > > [PATCH V10 0/6] mm: frontswap: overview (and proposal to merge at next window) > > > > (Note: V9->V10 only change is corrections in debugfs-related code/counters) > > > > (Note to earlier reviewers: This patchset was reorganized at V9 due > > to feedback from Kame Hiroyuki and Andrew Morton. Additionally, feedback > > on frontswap v8 from Andrew Morton also applies to cleancache, to wit: > > (1) change usage of sysfs to debugfs to avoid unnecessary kernel ABIs > > (2) rename all uses of "flush" to "invalidate" > > As a result, additional patches (5of6 and 6of6) were added to this > > series at V9 to patch cleancache core code and cleancache hooks in the mm > > and fs subsystems and update cleancache documentation accordingly.) > > I'm sorry I couldn't catch following... what happens at hibernation ? > frontswap is effectively stopped/skipped automatically ? or contents of > TMEM can be kept after power off and it can be read correctly when > resume thread reads swap ? > > In short: no influence to hibernation ? > I'm sorry if I misunderstand some.
Hi Kame --
Hibernation would need to be handled by the tmem backend (e.g. zcache, Xen tmem). In the case of Xen tmem, both save/restore and live migration are fully supported. I'm not sure if zcache works across hibernation; since all memory is kmalloc'ed, I think it should work fine, but it would be an interesting experiment.
Thanks, Dan
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