linux-kernel - Re: vchiq: Performance regression since 5.18-rc1

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Message-ID: <20220525150233.GX1790663@paulmck-ThinkPad-P17-Gen-1>
Date:   Wed, 25 May 2022 08:02:33 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     Stefan Wahren <stefan.wahren@...e.com>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nicolas Saenz Julienne <nsaenzju@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Minchan Kim <minchan@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Juri Lelli <juri.lelli@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Phil Elwell <phil@...pberrypi.com>, regressions@...ts.linux.dev
Subject: Re: vchiq: Performance regression since 5.18-rc1

On Wed, May 25, 2022 at 04:26:27PM +0200, Sebastian Andrzej Siewior wrote:
> On 2022-05-25 16:07:47 [+0200], Stefan Wahren wrote:
> > this was the same as Paul send. I think i need more time for investigation,
> > maybe there is an issue with the application.
> 
> I haven't seen Paul referring to *that* patch. He pointed to some fs/
> related changes.

True!  Both patches changed from a synchronize_rcu() to a
synchronize_rcu_expedited(), but different instances of synchronize_rcu().

							Thanx, Paul