linux-kernel - Re: [rfc/patch] mm/slub: restore/expand unfreeze

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Date:   Sun, 25 Jul 2021 17:02:22 +0200
From:   Mike Galbraith <efault@....de>
To:     Vlastimil Babka <vbabka@...e.cz>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     linux-rt-users@...r.kernel.org,
        Mel Gorman <mgorman@...hsingularity.net>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: Re: [rfc/patch] mm/slub: restore/expand unfreeze_partials() local
 exclusion scope

On Sun, 2021-07-25 at 16:16 +0200, Vlastimil Babka wrote:
> On 7/25/21 4:09 PM, Mike Galbraith wrote:
> > On Sat, 2021-07-24 at 00:39 +0200, Vlastimil Babka wrote:
> > >
> > > If not, then I would expect this to work (I don't think they ever nest
> > > in the opposite order, also lockdep should tell us instead of
> > > -ENOBOOT?), but might be missing something...
> >
> > Yeah, like #ifndef CONFIG_PREMPT_RT at the bottom of the loop that our
> > useless damn eyeballs auto-correct instead of reporting :)
>
> Well doh, good catch.

I never did see it.  I got sick of saying "but but but", and did make
mm/slub.i, which made it glow.

> Hope fixing that helps then?

Yeah, though RT should perhaps be pinned across release/re-acquire?

Actually, local locks should rediscover the recursion handling skills
they long had so such RT specific hole poking isn't necessary.  There
previously would have been no ifdef+typo there for eyeballs to miss and
miss and miss.

	-Mike