Re: [PATCH v2 5/6] mm: flush memcg percpu stats and events before releasing

[Johannes Weiner]

On Tue, Mar 12, 2019 at 03:34:02PM -0700, Roman Gushchin wrote:
> Flush percpu stats and events data to corresponding before releasing
> percpu memory.
> 
> Although per-cpu stats are never exactly precise, dropping them on
> floor regularly may lead to an accumulation of an error. So, it's
> safer to flush them before releasing.
> 
> To minimize the number of atomic updates, let's sum all stats/events
> on all cpus locally, and then make a single update per entry.
> 
> Signed-off-by: Roman Gushchin <guro@xxxxxx>

Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>

Do you mind merging 6/6 into this one? That would make it easier to
verify that the code added in this patch and the code removed in 6/6
are indeed functionally equivalent.