linux-kernel - Re: [PATCH 6/6] freezer: kill unused set_freezable_with

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Message-ID: <20110904184626.GA30101@redhat.com>
Date:	Sun, 4 Sep 2011 20:46:26 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	matthltc@...ibm.com, rjw@...k.pl, paul@...lmenage.org,
	containers@...ts.linux-foundation.org,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/6] freezer: kill unused set_freezable_with_signal()

On 09/03, Tejun Heo wrote:
>
> This patch removes set_freezable_with_signal() along with
> PF_FREEZER_NOSIG

Great. I never understood PF_FREEZER_NOSIG logic ;)

One question,

> @@ -72,10 +72,6 @@ bool __refrigerator(bool check_kthr_stop)
>  		schedule();
>  	}
>
> -	spin_lock_irq(&current->sighand->siglock);
> -	recalc_sigpending(); /* We sent fake signal, clean it up */
> -	spin_unlock_irq(&current->sighand->siglock);
> -

Why? This recalc_sigpending() makes sense imho. Otherwise the user-space
tasks (almost) always return with TIF_SIGPENDING. May be we can do this
under "if (PF_KTRHREAD)".

For example. Suppose the user-space task does wait_event_freezable()...

Hmm. OTOH, wait_event_freezable() looks wrong anyway... So probably
this doesn't matter. ptrace_stop/get_signal_to_deliver doesn't need
this, probably we do not care about the other callers.

It seems, a lot of get_signal_to_deliver() calles also call
try_to_freeze() for no reason.

So, yes, I am starting to think this change is fine too ;)

Oleg.

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