From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Ian Munsie <imunsie@au1.ibm.com>
Cc: Michael Neuling <mikey@neuling.org>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
stable@vger.kernel.org
Subject: Re: [PATCH] powerpc: Fix missing doorbell IPIs during nap power saving
Date: Mon, 29 Apr 2013 19:05:39 +1000 [thread overview]
Message-ID: <1367226339.7288.17.camel@pasglop> (raw)
In-Reply-To: <1367223460-4931-1-git-send-email-imunsie@au1.ibm.com>
On Mon, 2013-04-29 at 18:17 +1000, Ian Munsie wrote:
> This is not an issue with other interrupts that can wake a thread
> (external, decrementer) as they are level sensitive and will continue to
> be asserted by the hardware.
However, it might be worth experimenting setting the corresponding
bits in the PACA as well, as this will diminish the latency of
processing them.
IE. local_irq_enable() will see the bit, generate an interrupt
frame and call the handler which is a faster path than re-enabling
MSR:EE and then taking an external interrupt.
Cheers,
Ben.
next prev parent reply other threads:[~2013-04-29 9:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-29 8:17 [PATCH] powerpc: Fix missing doorbell IPIs during nap power saving Ian Munsie
2013-04-29 9:05 ` Benjamin Herrenschmidt [this message]
2013-04-29 14:06 ` Greg KH
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