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Wysocki" Date: Fri, 3 Jul 2020 14:17:50 +0200 Message-ID: Subject: Re: [RFC]: mm,power: introduce MADV_WIPEONSUSPEND To: Michal Hocko Cc: "Catangiu, Adrian Costin" , "linux-mm@kvack.org" , "linux-pm@vger.kernel.org" , "virtualization@lists.linux-foundation.org" , "linux-api@vger.kernel.org" , "akpm@linux-foundation.org" , "rjw@rjwysocki.net" , "len.brown@intel.com" , "pavel@ucw.cz" , "fweimer@redhat.com" , "keescook@chromium.org" , "luto@amacapital.net" , "wad@chromium.org" , "mingo@kernel.org" , "bonzini@gnu.org" , "Graf (AWS), Alexander" , "MacCarthaigh, Colm" , "Singh, Balbir" , "Sandu, Andrei" , "Brooker, Marc" , "Weiss, Radu" , "Manwaring, Derek" Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: BF3F31804E3A8 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Jul 3, 2020 at 1:30 PM Michal Hocko wrote: > > On Fri 03-07-20 10:34:09, Catangiu, Adrian Costin wrote: > > This patch adds logic to the kernel power code to zero out contents of > > all MADV_WIPEONSUSPEND VMAs present in the system during its transition > > to any suspend state equal or greater/deeper than Suspend-to-memory, > > known as S3. > > How does the application learn that its memory got wiped? S2disk is an > async operation and it can happen at any time during the task execution. > So how does the application work to prevent from corrupted state - e.g. > when suspended between two memory loads? This doesn't affect hibernation AFAICS, but system suspend (suspend-to-RAM or suspend-to-idle, or standby) is async too. I guess this calls for an interface to notify user space (that opted in to receive such notifications) on system-wide suspend start and finish. Thanks!