From: Adrian Hunter <adrian.hunter@intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
linux-kernel@vger.kernel.org, "Kleen,
Andi" <andi.kleen@intel.com>,
"Shishkin, Alexander" <alexander.shishkin@intel.com>
Subject: PERF_EVENT_IOC_SET_OUTPUT
Date: Tue, 01 Oct 2013 22:11:56 +0300 [thread overview]
Message-ID: <524B1E7C.3070108@intel.com> (raw)
Hi
It does not seem possible to use set-output between
task contexts of different types (e.g. a software event
to a hardware event)
If you look at perf_event_set_output():
/*
* If its not a per-cpu rb, it must be the same task.
*/
if (output_event->cpu == -1 && output_event->ctx != event->ctx)
goto out;
ctx (perf_event_context) won't be the same for events
of different types. Is this restriction necessary?
Regards
Adrian
next reply other threads:[~2013-10-01 19:12 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-01 19:11 Adrian Hunter [this message]
2013-10-02 10:03 ` PERF_EVENT_IOC_SET_OUTPUT Peter Zijlstra
2013-10-02 10:29 ` PERF_EVENT_IOC_SET_OUTPUT Frederic Weisbecker
2013-10-02 11:27 ` PERF_EVENT_IOC_SET_OUTPUT Peter Zijlstra
2013-10-02 11:43 ` PERF_EVENT_IOC_SET_OUTPUT Frederic Weisbecker
2013-10-02 12:29 ` PERF_EVENT_IOC_SET_OUTPUT Ingo Molnar
2013-10-02 12:40 ` PERF_EVENT_IOC_SET_OUTPUT Peter Zijlstra
2013-10-03 6:43 ` PERF_EVENT_IOC_SET_OUTPUT Ingo Molnar
2013-10-07 16:42 ` PERF_EVENT_IOC_SET_OUTPUT Peter Zijlstra
2013-10-29 14:08 ` [tip:perf/core] perf: Fix the perf context switch optimization tip-bot for Peter Zijlstra
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