Re: [fanotify] a8b98c808e: stress-ng.fanotify.ops_per_sec 32.2% improvement

[Jan Kara]

On Thu 03-06-21 09:57:15, Amir Goldstein wrote:
> On Thu, Jun 3, 2021 at 4:36 AM kernel test robot <oliver.sang@xxxxxxxxx> wrote:
> >
> >
> >
> > Greeting,
> >
> > FYI, we noticed a 32.2% improvement of stress-ng.fanotify.ops_per_sec due to commit:
> >
> >
> > commit: a8b98c808eab3ec8f1b5a64be967b0f4af4cae43 ("fanotify: fix permission model of unprivileged group")
> > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> >
> >
> 
> I guess now we know what caused the reported regression:
> https://lore.kernel.org/lkml/20210511124632.GL24154@xxxxxxxxxxxxxx/
> 
> I didn't know that capable() is so significant.

Yeah, I wouldn't guess either. Interesting.

								Honza

-- 
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR