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References: <20220630083044.997474-1-yosryahmed@google.com>
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From:   Shakeel Butt <shakeelb@google.com>
Date:   Thu, 30 Jun 2022 08:02:10 -0700
Message-ID: <CALvZod4n1GqdNU49YVDxC1Ek_6Ob-HKUSm+48GJ_Y_gZw24pCQ@mail.gmail.com>
Subject: Re: [PATCH v3] mm: vmpressure: don't count proactive reclaim in vmpressure
To:     Yosry Ahmed <yosryahmed@google.com>
Cc:     Johannes Weiner <hannes@cmpxchg.org>,
        Michal Hocko <mhocko@kernel.org>,
        Roman Gushchin <roman.gushchin@linux.dev>,
        Muchun Song <songmuchun@bytedance.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Matthew Wilcox <willy@infradead.org>,
        Vlastimil Babka <vbabka@suse.cz>,
        David Hildenbrand <david@redhat.com>,
        Miaohe Lin <linmiaohe@huawei.com>, NeilBrown <neilb@suse.de>,
        Alistair Popple <apopple@nvidia.com>,
        Suren Baghdasaryan <surenb@google.com>,
        Peter Xu <peterx@redhat.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Cgroups <cgroups@vger.kernel.org>, Linux MM <linux-mm@kvack.org>
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On Thu, Jun 30, 2022 at 1:30 AM Yosry Ahmed <yosryahmed@google.com> wrote:
>
> vmpressure is used in cgroup v1 to notify userspace of reclaim
> efficiency events, and is also used in both cgroup v1 and v2 as a signal
> for memory pressure for networking, see
> mem_cgroup_under_socket_pressure().
>
> Proactive reclaim intends to probe memcgs for cold memory, without
> affecting their performance. Hence, reclaim caused by writing to
> memory.reclaim should not trigger vmpressure.
>
> Signed-off-by: Yosry Ahmed <yosryahmed@google.com>

Acked-by: Shakeel Butt <shakeelb@google.com>