linux-kernel - Re: [PATCH 2/2] taskstats: add_del_listener() should ignore !valid listener's

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Date:	Thu, 21 Jul 2011 16:29:20 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Vasiliy Kulikov <segoon@...nwall.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Balbir Singh <bsingharora@...il.com>,
	Jerome Marchand <jmarchan@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] taskstats: add_del_listener() should ignore !valid
	listener's

On 07/21, Vasiliy Kulikov wrote:
>
> On Wed, Jul 20, 2011 at 23:01 +0200, Oleg Nesterov wrote:
> >
> > Not sure I understand... This is not optimizing, the patch tries to
> > fix the unlikely (in fact mostly theoretical) and minor problem.
>
> Ah, I see the problem here.  Yes, then it surely makes sense.

Yes, agreed.

Just in case... please note that "s->pid can be reused" doesn't
necessarily mean this pid was reused by kernel. For example, a
task can close the socket without DEREGISTER, then create another
one and do REGISTER which can race with send_cpu_listeners().
Afaics.

All this register/deregister logic doesn't look very right, imho.

> Reviewed-by: Vasiliy Kulikov <segoon@...nwall.com>

Thanks,

Oleg.

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