linux-kernel - Re: [PATCH 1/1] pidfd: don't do_notify_pidfd() if !thread_group

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Message-ID: <20240127193204.GD13787@redhat.com>
Date: Sat, 27 Jan 2024 20:32:05 +0100
From: Oleg Nesterov <oleg@...hat.com>
To: Tycho Andersen <tycho@...ho.pizza>
Cc: Christian Brauner <brauner@...nel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Tycho Andersen <tandersen@...flix.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] pidfd: don't do_notify_pidfd() if
 !thread_group_empty()

On 01/27, Tycho Andersen wrote:
>
> On Sat, Jan 27, 2024 at 02:21:05PM +0100, Oleg Nesterov wrote:
> > do_notify_pidfd() makes no sense until the whole thread group exits, change
> > do_notify_parent() to check thread_group_empty().
> >
> > This avoids the unnecessary do_notify_pidfd() when tsk is not a leader, or
> > it exits before other threads, or it has a ptraced EXIT_ZOMBIE sub-thread.
> >
> > Signed-off-by: Oleg Nesterov <oleg@...hat.com>
>
> Looks good to me, thanks.
>
> Reviewed-by: Tycho Andersen <tandersen@...flix.com>

Thanks Tycho,

Oleg.