linux-kernel - Re: [PATCH] perf record: fix fallback to cpu-clock on ppc

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Date:	Wed, 9 May 2012 11:56:19 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	David Ahern <dsahern@...il.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org
Subject: Re: [PATCH] perf record: fix fallback to cpu-clock on ppc

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
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