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charset=us-ascii Content-Disposition: inline In-Reply-To: <89171a94-8b6f-e949-0078-10fa8fd26dfc@yandex-team.ru> User-Agent: Mutt/1.12.2 (2019-09-21) 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 Tue, Oct 15, 2019 at 05:04:44PM +0300, Konstantin Khlebnikov wrote: > On 15/10/2019 16.53, Johannes Weiner wrote: > > On Tue, Oct 15, 2019 at 11:09:59AM +0300, Konstantin Khlebnikov wrote: > > > Mapped, dirty and writeback pages are also counted in per-lruvec stats. > > > These counters needs update when page is moved between cgroups. > > > > > > Fixes: 00f3ca2c2d66 ("mm: memcontrol: per-lruvec stats infrastructure") > > > Signed-off-by: Konstantin Khlebnikov > > > > Acked-by: Johannes Weiner > > > > Please mention in the changelog that currently is nobody *consuming* > > the lruvec versions of these counters and that there is no > > user-visible effect. Thanks > > > > Maybe just kill all these per-lruvec counters? > I see only one user which have no alternative data source: WORKINGSET_ACTIVATE. > > This will save some memory: 32 * sizeof(long) * nr_nodes * nr_cpus bytes This is backwards, see my reply to Michal, as well as the patches at https://lore.kernel.org/linux-mm/20190603210746.15800-1-hannes@cmpxchg.org/ We're not using the lruvec counters in all places where we should.