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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1367226339.7288.17.camel@pasglop \
--to=benh@kernel.crashing.org \
--cc=imunsie@au1.ibm.com \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=mikey@neuling.org \
--cc=stable@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.