linux-kernel - Re: [PATCH v2 11/28] mm: slub: implement SLUB version of obj_to

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Message-ID: <20200203174418.GE1697@cmpxchg.org>
Date:   Mon, 3 Feb 2020 12:44:18 -0500
From:   Johannes Weiner <hannes@...xchg.org>
To:     Roman Gushchin <guro@...com>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        linux-kernel@...r.kernel.org, kernel-team@...com,
        Bharata B Rao <bharata@...ux.ibm.com>,
        Yafang Shao <laoar.shao@...il.com>
Subject: Re: [PATCH v2 11/28] mm: slub: implement SLUB version of
 obj_to_index()

On Mon, Jan 27, 2020 at 09:34:36AM -0800, Roman Gushchin wrote:
> This commit implements SLUB version of the obj_to_index() function,
> which will be required to calculate the offset of obj_cgroup in the
> obj_cgroups vector to store/obtain the objcg ownership data.
> 
> To make it faster, let's repeat the SLAB's trick introduced by
> commit 6a2d7a955d8d ("[PATCH] SLAB: use a multiply instead of a
> divide in obj_to_index()") and avoid an expensive division.
> 
> Signed-off-by: Roman Gushchin <guro@...com>
> Acked-by: Christoph Lameter <cl@...ux.com>

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