linux-kernel - Re: [linux-next:master] [lockref] d042dae6ad: unixbench.throughput -33.7% regression

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Date: Thu, 27 Jun 2024 10:23:27 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Mateusz Guzik <mjguzik@...il.com>
Cc: kernel test robot <oliver.sang@...el.com>, oe-lkp@...ts.linux.dev, lkp@...el.com, 
	Linux Memory Management List <linux-mm@...ck.org>, Christian Brauner <brauner@...nel.org>, linux-kernel@...r.kernel.org, 
	ying.huang@...el.com, feng.tang@...el.com, fengwei.yin@...el.com
Subject: Re: [linux-next:master] [lockref] d042dae6ad: unixbench.throughput
 -33.7% regression

On Thu, 27 Jun 2024 at 09:57, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> .dput.terminate_walk.path_openat.do_filp_open

Hmm. This may be due to the benchmark being in /proc/net, and
retain_dentry() returning false.

Then the fastpath in fast_dput() won't trigger, and we'll always end
up doing the dentry lock if we're the last user (which presumably we
will be, there's probably not anybody else there?)

                Linus