From: Petr Vorel <pvorel@suse.cz>
To: Cyril Hrubis <chrubis@suse.cz>
Cc: Richard Palethorpe <rpalethorpe@suse.com>, ltp@lists.linux.it
Subject: Re: [LTP] [PATCH] controllers/cpuset: Make mount failure TCONF
Date: Fri, 27 Oct 2023 19:45:12 +0200 [thread overview]
Message-ID: <20231027174512.GA710840@pevik> (raw)
In-Reply-To: <ZTvH_DptjIrZJx-A@yuki>
> Hi!
> > > It appears that if the subsystem is available under V2 then mounting
> > > the V1 can fail. Probably when the V2 has processes assigned to a
> > > group it controls.
> > Sounds likely, but it would be good to check this in the kernel code or with
> > kernel cgroup developers.
> I'm pretty sure that controller can be used either in v1, or in v2 but
> not from both at the same time by choice. Some of the changes between v1
> and v2 are incompatible so this couldn't work either way.
> I think that once the controller name is written to
> /sys/fs/cgroup/unified/cgroup.subtree_controll mounting it to v1 should
> fail, so maybe we should just try to grep the fail instead and exit the
> test with TCONF if we found the controller bound to v2 already.
Sounds like a good idea.
Kind regards,
Petr
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Mailing list info: https://lists.linux.it/listinfo/ltp
next prev parent reply other threads:[~2023-10-27 17:45 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-27 10:49 [LTP] [PATCH] controllers/cpuset: Make mount failure TCONF Richard Palethorpe via ltp
2023-10-27 11:01 ` Petr Vorel
[not found] ` <ZTvH_DptjIrZJx-A@yuki>
2023-10-27 17:45 ` Petr Vorel [this message]
2023-10-30 10:39 ` Richard Palethorpe
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