linux-kernel - Re: [v8 PATCH 08/13] mm: vmscan: use a new flag to indicate shrinker is registered

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Message-ID: <CALvZod7AJ9EAxDhDU-MddFieO9n6C4gEbbR=sprmRWvLJpHo_A@mail.gmail.com>
Date:   Mon, 8 Mar 2021 09:48:22 -0800
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Yang Shi <shy828301@...il.com>
Cc:     Roman Gushchin <guro@...com>, Kirill Tkhai <ktkhai@...tuozzo.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Dave Chinner <david@...morbit.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [v8 PATCH 08/13] mm: vmscan: use a new flag to indicate shrinker
 is registered

On Tue, Feb 16, 2021 at 4:13 PM Yang Shi <shy828301@...il.com> wrote:
>
> Currently registered shrinker is indicated by non-NULL shrinker->nr_deferred.
> This approach is fine with nr_deferred at the shrinker level, but the following
> patches will move MEMCG_AWARE shrinkers' nr_deferred to memcg level, so their
> shrinker->nr_deferred would always be NULL.  This would prevent the shrinkers
> from unregistering correctly.
>
> Remove SHRINKER_REGISTERING since we could check if shrinker is registered
> successfully by the new flag.
>
> Acked-by: Kirill Tkhai <ktkhai@...tuozzo.com>
> Acked-by: Vlastimil Babka <vbabka@...e.cz>
> Signed-off-by: Yang Shi <shy828301@...il.com>

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