From: Oleg Nesterov <oleg@tv-sign.ru>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org, Linus Torvalds <torvalds@transmeta.com>
Subject: Re: [patch] big IRQ lock removal, 2.5.27-G0
Date: Wed, 24 Jul 2002 07:07:34 +0400 [thread overview]
Message-ID: <3D3E19F6.72806B9D@tv-sign.ru> (raw)
In-Reply-To: <Pine.LNX.4.44.0207240137190.3812-100000@localhost.localdomain>
Hello.
> > Then local_bh_enable() has a small preemptible window between
> > __local_bh_enable() and do_softirq()->local_irq_save(flags).
> > It is only latency problem.
>
> i dont think getting a preemption before softirqs are processed is a big
> problem. Such type of preemption comes in form of an interrupt, which
> handles softirqs in irq_exit() anyway, so there's no delay.
Well, no. Not all smp_xxx_interrupt() use irq_enter/exit().
Reschedule interrupt, for example, do not. But indeed, it is not
big problem.
Oleg.
next prev parent reply other threads:[~2002-07-24 3:01 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-23 23:40 Oleg Nesterov
2002-07-23 23:50 ` Ingo Molnar
2002-07-23 23:54 ` Ingo Molnar
2002-07-24 1:00 ` Oleg Nesterov
2002-07-24 7:19 ` Ingo Molnar
2002-07-24 3:07 ` Oleg Nesterov [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-07-23 16:26 Ingo Molnar
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