netdev - Re: SLAB_TYPESAFE_BY_RCU without constructors (was Re: [PATCH v4 13/17] khwasan: add hooks implementation)

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Message-ID: <CANn89iLLQP2vA+2J-zxL3Fa75zNw=yRmv3Jg6vcEc=fYeEZ2ow@mail.gmail.com>
Date:   Tue, 31 Jul 2018 10:41:54 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Christoph Lameter <cl@...ux.com>
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        "Theodore Ts'o" <tytso@....edu>, jack@...e.com,
        linux-ext4@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        Florian Westphal <fw@...len.de>,
        David Miller <davem@...emloft.net>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev <netdev@...r.kernel.org>,
        Gerrit Renker <gerrit@....abdn.ac.uk>, dccp@...r.kernel.org,
        jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, airlied@...ux.ie,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Ursula Braun <ubraun@...ux.ibm.com>,
        linux-s390@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-mm <linux-mm@...ck.org>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: SLAB_TYPESAFE_BY_RCU without constructors (was Re: [PATCH v4
 13/17] khwasan: add hooks implementation)

On Tue, Jul 31, 2018 at 10:36 AM Christopher Lameter <cl@...ux.com> wrote:

>
> If there is refcounting going on then why use SLAB_TYPESAFE_BY_RCU?

To allow fast reuse of objects, without going through call_rcu() and
reducing cache efficiency.

I believe this is mentioned in Documentation/RCU/rculist_nulls.txt