linux-kernel - Re: [PATCH bpf-next v4 01/30] mm: support nesting memalloc_use

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Date:   Fri, 21 Aug 2020 09:29:53 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Roman Gushchin <guro@...com>
Cc:     bpf@...r.kernel.org, netdev <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>,
        LKML <linux-kernel@...r.kernel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Linux MM <linux-mm@...ck.org>
Subject: Re: [PATCH bpf-next v4 01/30] mm: support nesting memalloc_use_memcg()

On Fri, Aug 21, 2020 at 8:01 AM Roman Gushchin <guro@...com> wrote:
>
> From: Johannes Weiner <hannes@...xchg.org>
>
> Support nesting of memalloc_use_memcg() to be able to use
> from an interrupt context.
>
> Make memalloc_use_memcg() return the old memcg and convert existing
> users to a stacking model. Delete the unused memalloc_unuse_memcg().
>
> Roman: I've rephrased the original commit log, because it was
> focused on the accounting problem related to loop devices. I made
> it less specific, so it can work for bpf too. Also rebased to the
> current state of the mm tree.
>
> The original patch can be found here:
> https://lkml.org/lkml/2020/5/28/806
>
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>
> Signed-off-by: Roman Gushchin <guro@...com>

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