Re: [PATCH 00/14] per memcg lru_lock

From: Michal Hocko
Date: Tue Aug 20 2019 - 06:45:36 EST

On Tue 20-08-19 17:48:23, Alex Shi wrote:
> This patchset move lru_lock into lruvec, give a lru_lock for each of
> lruvec, thus bring a lru_lock for each of memcg.
> Per memcg lru_lock would ease the lru_lock contention a lot in
> this patch series.
> In some data center, containers are used widely to deploy different kind
> of services, then multiple memcgs share per node pgdat->lru_lock which
> cause heavy lock contentions when doing lru operation.

Having some real world workloads numbers would be more than useful
for a non trivial change like this. I believe googlers have tried
something like this in the past but then didn't have really a good
example of workloads that benefit. I might misremember though. Cc Hugh.

Michal Hocko