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

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Message-ID: <20111004181357.GA6822@redhat.com>
Date:	Tue, 4 Oct 2011 20:13:57 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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, Linus Torvalds wrote:
>
> On Tue, Oct 4, 2011 at 10:14 AM, Oleg Nesterov <oleg@...hat.com> wrote:
> >
> > Whatever we do with the locking, this can't remove O(nr_threads),
> > although read_lock() could help to reduce the contention.
>
> Read locks often make things worse.

Yes, yes, I see, thanks.

I meant that probably "more concurrency" was the reason for rwlock
this series adds.

Oleg.

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