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

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Date:   Tue, 25 Jun 2019 11:33:23 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Roman Gushchin <guro@...com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Linux MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Kernel Team <kernel-team@...com>,
        Johannes Weiner <hannes@...xchg.org>,
        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 4:18 PM Roman Gushchin <guro@...com> 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>

Reviewed-by: Shakeel Butt <shakeelb@...gle.com>