linux-kernel - Re: [RFC v2 00/34] SLUB: reduce irq disabled scope and make it RT compatible

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Date:   Mon, 14 Jun 2021 13:10:35 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Christoph Lameter <cl@...ux.com>,
        David Rientjes <rientjes@...gle.com>,
        Pekka Enberg <penberg@...nel.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Jann Horn <jannh@...gle.com>
Subject: Re: [RFC v2 00/34] SLUB: reduce irq disabled scope and make it RT
 compatible

On 6/9/21 1:38 PM, Vlastimil Babka wrote:
> Changes since RFC v1 [1]:
> * Addressed feedback from Christoph and Mel, added their acks.
> * Finished RT conversion, including adopting 2 patches from the RT tree.
> * The optional local_lock conversion has to sacrifice lockless fathpaths on RT
> * Added some more cleanup patches to the front.
> 
> This series was initially inspired by Mel's pcplist local_lock rewrite, and
> also by interest to better understand SLUB's locking and the new locking
> primitives and their RT variants and implications. It should make SLUB more
> preemption-friendly and fully RT compatible, hopefully without noticeable
> regressions on !RT kernels, as the fast paths are not affected there.
> 
> Series is based on 5.13-rc5 and also available as a git branch:
> https://git.kernel.org/pub/scm/linux/kernel/git/vbabka/linux.git/log/?h=slub-local-lock-v2r1

Pushed a new revision branch:
https://git.kernel.org/pub/scm/linux/kernel/git/vbabka/linux.git/log/?h=slub-local-lock-v2r2

which fixes a bug in
[RFC v2 33/34] mm, slub: use migrate_disable() on PREEMPT_RT
that was reported by Mel