From: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
To: David Ahern <dsahern@gmail.com>
Cc: linux-kernel@vger.kernel.org, peterz@infradead.org
Subject: Re: [PATCH] perf record: fix fallback to cpu-clock on ppc
Date: Wed, 9 May 2012 11:56:19 -0300 [thread overview]
Message-ID: <20120509145619.GM2485@infradead.org> (raw)
In-Reply-To: <1336452004-55724-1-git-send-email-dsahern@gmail.com>
Em Mon, May 07, 2012 at 10:40:04PM -0600, David Ahern escreveu:
> perf-record on PPC is not falling back to cpu-clock:
>
> Old kernel, cannot exclude guest or host samples.
>
> Error: sys_perf_event_open() syscall returned with 6 (No such device or address). /bin/dmesg may provide additional information.
>
> Fatal: No CONFIG_PERF_EVENTS=y kernel support configured?
>
> The problem is that until 2.6.37 (behavior changed with commit b0a873e)
> perf on PPC returns ENXIO when hw_perf_event_init() fails. With this
> patch we get the expected behavior:
>
> Old kernel, cannot exclude guest or host samples.
> The cycles event is not supported, trying to fall back to cpu-clock-ticks
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.150 MB /tmp/perf.data (~6569 samples) ]
Thanks, applied to my perf/core branch.
Can you please provide one for perf/urgent?
- Arnaldo
next prev parent reply other threads:[~2012-05-09 14:56 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-08 4:40 [PATCH] perf record: fix fallback to cpu-clock on ppc David Ahern
2012-05-08 13:12 ` Arnaldo Carvalho de Melo
2012-05-08 14:10 ` David Ahern
2012-05-09 14:56 ` Arnaldo Carvalho de Melo [this message]
2012-05-09 16:22 ` David Ahern
2012-05-09 17:16 ` Arnaldo Carvalho de Melo
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