From: Jacob Pan <jacob.jun.pan@linux.intel.com>
To: linux-kernel@vger.kernel.org, mingo@redhat.com, hpa@zytor.com,
tglx@linutronix.de, jacob.jun.pan@linux.intel.com, mingo@elte.hu
Cc: linux-tip-commits@vger.kernel.org
Subject: Re: [tip:irq/core] x86: Sanitize apb timer interrupt handling
Date: Tue, 12 Oct 2010 14:20:00 -0700 [thread overview]
Message-ID: <20101012142000.00001358@unknown> (raw)
In-Reply-To: <tip-a5ef2e70405c8a9ee380b5ff33a008c75454791f@git.kernel.org>
>x86: Sanitize apb timer interrupt handling
>
>Disable the interrupt in CPU_DEAD where it belongs.
My main concern is the performance cost. The power management code for
Moorestown system make use of the cpu hotplug code (disable_nonboot_cpus)
but much more frequently. The system low power states are call S0 idle
state (s0ix).
Leaving the irq enabled at the chip and desc level between S0ix states
might give some performance benefit. That was my original thought.
Will it cause problems?
Thanks,
Jacob
next parent reply other threads:[~2010-10-12 21:23 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <tip-a5ef2e70405c8a9ee380b5ff33a008c75454791f@git.kernel.org>
2010-10-12 21:20 ` Jacob Pan [this message]
2010-10-12 21:28 ` [tip:irq/core] x86: Sanitize apb timer interrupt handling Thomas Gleixner
2010-10-12 22:12 ` Jacob Pan
2010-10-12 22:26 ` Thomas Gleixner
2010-10-12 22:44 ` Jacob Pan
2010-10-13 18:10 ` Jacob Pan
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