On Wed, 28 Sep 2011 07:09:18 -0700 (PDT) Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> wrote: > > From: KAMEZAWA Hiroyuki [mailto:kamezawa.hiroyu@xxxxxxxxxxxxxx] > > Sent: Wednesday, September 28, 2011 12:16 AM > > To: Dan Magenheimer > > Cc: linux-kernel@xxxxxxxxxxxxxxx; linux-mm@xxxxxxxxx; jeremy@xxxxxxxx; hughd@xxxxxxxxxx; > > ngupta@xxxxxxxxxx; Konrad Wilk; JBeulich@xxxxxxxxxx; Kurt Hackel; npiggin@xxxxxxxxx; akpm@linux- > > foundation.org; riel@xxxxxxxxxx; hannes@xxxxxxxxxxx; matthew@xxxxxx; Chris Mason; > > sjenning@xxxxxxxxxxxxxxxxxx; jackdachef@xxxxxxxxx; cyclonusj@xxxxxxxxx; levinsasha928@xxxxxxxxx > > 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@xxxxxxxxxx> 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. > I'm afraid that users will lose data on memory of frontswap/zcache/tmem by power-off, hibernation. How about adding internal hooks to disable/sync frontswap itself before hibernation ? difficult ? Thanks, -Kame -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>