linux-kernel - Re: [PATCH 0/1] exit: kill signal_struct->quick

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Date: Sat, 15 Jun 2024 09:53:21 -0500
From: "Eric W. Biederman" <ebiederm@...ssion.com>
To: Oleg Nesterov <oleg@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,  Tejun Heo <tj@...nel.org>,
  linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/1] exit: kill signal_struct->quick_threads

Oleg Nesterov <oleg@...hat.com> writes:

> So...
>
> Eric, do you agree with this patch or not?

I really don't.

I think skipping some work if SIGNAL_GROUP_EXIT is already
set is not necessarily wrong.

I think we need the quick_threads count, and related cleanups.
I was hoping to be able to post a patchset with this reply
to explain things, but it looks like that is still a couple
of days off.

Where I was going, and where I think we should go with quick_threads is
an exit path that is much easier to reason about and maintain.  But the
decrement needs to move into the same code that sets SIGNAL_GROUP_EXIT.
Which makes it something very different from signal->live.

Eric