linux-kernel - Re: [PATCH v7 07/10] mm: synchronize access to kmem

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Message-ID: <20190616162716.broxurphhmvdzy5s@esperanza>
Date:   Sun, 16 Jun 2019 19:27:16 +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 07/10] mm: synchronize access to kmem_cache dying flag
 using a spinlock

On Tue, Jun 11, 2019 at 04:18:10PM -0700, Roman Gushchin wrote:
> Currently the memcg_params.dying flag and the corresponding
> workqueue used for the asynchronous deactivation of kmem_caches
> is synchronized using the slab_mutex.
> 
> It makes impossible to check this flag from the irq context,
> which will be required in order to implement asynchronous release
> of kmem_caches.
> 
> So let's switch over to the irq-save flavor of the spinlock-based
> synchronization.
> 
> Signed-off-by: Roman Gushchin <guro@...com>

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