Re: [PATCH] mm/memcontrol: update lruvec counters in mem_cgroup_move_account

From: Konstantin Khlebnikov
Date: Tue Oct 15 2019 - 10:04:50 EST

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 <khlebnikov@xxxxxxxxxxxxxx>

Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>

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