linux-kernel - Re: [RFC][PATCH 0/5] Signal scalability series

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Date:	Tue, 4 Oct 2011 19:52:35 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Matt Fleming <matt@...sole-pimps.org>,
	Tejun Heo <htejun@...il.com>, linux-kernel@...r.kernel.org,
	Tony Luck <tony.luck@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC][PATCH 0/5] Signal scalability series

On 10/04, Oleg Nesterov wrote:
>
> On 10/03, Peter Zijlstra wrote:
> >
> > Right, so the thing Thomas and I have been promoting for a while now is
> > to update a signal target vector on every signal mask update. Mask
> > updates should be the slow path. This would leave us with a ready target
> > in O(1).
>
> Yes. This is the "obvious" solution ;) Now that we have
> set_current_blocked() this is simple. Except, of course, this blows
> signal_struct and set_current_blocked() can't rely on TIF_SIGPENDING.
> But we can probably add TIF_YOU_ARE_LISTED_IN_CURR_TARGET_ARRAY.

Forgot to mention... Unblocking becomes "nontrivial" too. But almost
all these changes are local to set_current_blocked().

Oleg.

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