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Subject: Re: [RFC v2 00/34] SLUB: reduce irq disabled scope and make it RT
 compatible
To:     linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        Christoph Lameter <cl@linux.com>,
        David Rientjes <rientjes@google.com>,
        Pekka Enberg <penberg@kernel.org>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc:     Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Thomas Gleixner <tglx@linutronix.de>,
        Mel Gorman <mgorman@techsingularity.net>,
        Jesper Dangaard Brouer <brouer@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Jann Horn <jannh@google.com>
References: <20210609113903.1421-1-vbabka@suse.cz>
From:   Vlastimil Babka <vbabka@suse.cz>
Message-ID: <7be07579-d7fd-d9b7-0c86-a8bf7fc094fc@suse.cz>
Date:   Mon, 14 Jun 2021 13:10:35 +0200
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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