linux-kernel - Re: [PATCH v7 06/10] mm: don't check the dying flag on kmem

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Message-ID: <20190616162645.rbcjhqjceuuxgvgr@esperanza>
Date:   Sun, 16 Jun 2019 19:26:45 +0300
From:   Vladimir Davydov <vdavydov.dev@...il.com>
To:     Roman Gushchin <guro@...com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kernel-team@...com,
        Johannes Weiner <hannes@...xchg.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Waiman Long <longman@...hat.com>
Subject: Re: [PATCH v7 06/10] mm: don't check the dying flag on kmem_cache
 creation

On Tue, Jun 11, 2019 at 04:18:09PM -0700, Roman Gushchin wrote:
> There is no point in checking the root_cache->memcg_params.dying
> flag on kmem_cache creation path. New allocations shouldn't be
> performed using a dead root kmem_cache, so no new memcg kmem_cache
> creation can be scheduled after the flag is set. And if it was
> scheduled before, flush_memcg_workqueue() will wait for it anyway.
> 
> So let's drop this check to simplify the code.
> 
> Signed-off-by: Roman Gushchin <guro@...com>

Acked-by: Vladimir Davydov <vdavydov.dev@...il.com>