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charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 5335C6C3C X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 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: Hi Michal, On Tue, Aug 11, 2020 at 10:36 AM Michal Koutn=C3=BD wrot= e: > > Hi Shakeel. > > On Tue, Jul 07, 2020 at 10:02:50AM -0700, Shakeel Butt wrote: > > > Well, I was talkingg about memory.low. It is not meant only to protec= t > > > from the global reclaim. It can be used for balancing memory reclaim > > > from _any_ external memory pressure source. So it is somehow related = to > > > the usecase you have mentioned. > > > > > > > For the uswapd use-case, I am not concerned about the external memory > > pressure source but the application hitting its own memory.high limit > > and getting throttled. > FTR, you can transform own memory.high into "external" pressure with a > hierarchy such as > > limit-group memory.high=3DN+margin memory.low=3D0 > `- latency-sensitive-group memory.low=3DN > `- regular-group memory.low=3D0 > > Would that ensure the latency targets? > My concern was not "whom to reclaim from" but it was "If I use memory.high for reclaim, processes running in that memcg can hit memory.high and get throttled". However Roman has reduced the window where that can happen. Anyways I will send the next version after this merge window closes. Shakeel