linux-kernel - Re: [PATCH] mm/memcg: Disable task obj_stock for PREEMPT

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Message-ID: <YQpVU4/QNE251IcX@dhcp22.suse.cz>
Date:   Wed, 4 Aug 2021 10:52:35 +0200
From:   Michal Hocko <mhocko@...e.com>
To:     Waiman Long <llong@...hat.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Johannes Weiner <hannes@...xchg.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>, Roman Gushchin <guro@...com>,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        linux-mm@...ck.org, Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <songmuchun@...edance.com>,
        Luis Goncalves <lgoncalv@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] mm/memcg: Disable task obj_stock for PREEMPT_RT

On Tue 03-08-21 21:40:35, Waiman Long wrote:
[...]
> The purpose of this series is to improve kmem_cache allocation and free
> performance for non-RT kernel. So not disabling/enabling interrupt help a
> bit in this regard.

Johannes has explained the irq disabling role in the stock draining just
yesterday. Have a look at http://lkml.kernel.org/r/YQlPiLY0ieRb704V@cmpxchg.org
-- 
Michal Hocko
SUSE Labs