linux-kernel - Re: [PATCH v5 3/4] mm: introduce page memcg flags

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Message-ID: <20201005145749.GA3390@cmpxchg.org>
Date:   Mon, 5 Oct 2020 10:57:49 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Roman Gushchin <guro@...com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Michal Hocko <mhocko@...nel.org>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, kernel-team@...com
Subject: Re: [PATCH v5 3/4] mm: introduce page memcg flags

On Fri, Oct 02, 2020 at 10:25:58AM -0700, Roman Gushchin wrote:
> The lowest bit in page->memcg_data is used to distinguish between
> struct memory_cgroup pointer and a pointer to a objcgs array.
> All checks and modifications of this bit are open-coded.
> 
> Let's formalize it using page memcg flags, defined in enum
> page_memcg_data_flags.
> 
> Additional flags might be added later.
> 
> Signed-off-by: Roman Gushchin <guro@...com>
> Reviewed-by: Shakeel Butt <shakeelb@...gle.com>

Acked-by: Johannes Weiner <hannes@...xchg.org>