linux-kernel - Re: [PATCH 1/5] mm: prepare to premature release of memcg->vmstats

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Message-ID: <20190311171402.GA10823@cmpxchg.org>
Date:   Mon, 11 Mar 2019 13:14:02 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Roman Gushchin <guroan@...il.com>
Cc:     linux-mm@...ck.org, kernel-team@...com,
        linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
        Rik van Riel <riel@...riel.com>,
        Michal Hocko <mhocko@...nel.org>, Roman Gushchin <guro@...com>
Subject: Re: [PATCH 1/5] mm: prepare to premature release of
 memcg->vmstats_percpu

On Thu, Mar 07, 2019 at 03:00:29PM -0800, Roman Gushchin wrote:
> Prepare to handle premature release of memcg->vmstats_percpu data.
> Currently it's a generic pointer which is expected to be non-NULL
> during the whole life time of a memcg. Switch over to the
> rcu-protected pointer, and carefully check it for being non-NULL.
> 
> This change is a required step towards dynamic premature release
> of percpu memcg data.
> 
> Signed-off-by: Roman Gushchin <guro@...com>

Acked-by: Johannes Weiner <hannes@...xchg.org>