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Message-ID: <20091201120439.GB4061@wear.picochip.com>
Date: Tue, 1 Dec 2009 12:04:40 +0000
From: Jamie Iles <jamie@...ieiles.com>
To: linux-kernel@...r.kernel.org
Subject: Perf events/ARM
Hi,
I'm looking at adding support for the hardware performance counters in ARMv6
using the new perf events framework. I have a simple setup that uses the
counters on their own, but wrt the perf events framework:
- what are the requirements of set_perf_event_pending() and
perf_event_do_pending()? As far as I can tell from sparc/x86/powerpc,
set_perf_event_pending() triggers an interrupt that then calls
perf_event_do_pending(). Does perf_event_do_pending need to run in
interrupt context or could I use a soft IRQ if platforms don't have a
spare IRQ?
- ARM does not have proper support for atomic64's. Other than
performance, would there be any known problems with using the generic
spinlocked atomic64's?
Thanks,
Jamie
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