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From: Andrew Davidoff <davidoff@qedmf.net>
To: linux-perf-users@vger.kernel.org
Subject: Getting started with perf; a couple of questions
Date: Thu, 30 May 2013 23:26:11 -0600	[thread overview]
Message-ID: <CAJLXCZTs4i0P3wA78u25aCt-rfcsBNQ8t0QSsbWazQyoV-XdLA@mail.gmail.com> (raw)

Hi,

I am getting started with perf and have a couple of questions.

* Does the version of perf being used need to be built from the source
for the running kernel, or is it supported to use a build from a newer
kernel source? I am currently running perf built from 3.9.4 kernel
sources on a machine running kernel 2.6.32.

* I am getting event output with a specific `perf stat` invocation,
but when I run the same invocation under `perf record`, `perf report`
complains "The perf.data file has no samples". Why would that be? The
invocation looks like this:

perf record -e cache-misses,page-faults,minor-faults,major-faults,cpu-migrations,L1-dcache-load-misses,L1-dcache-store-misses,L1-icache-load-misses,LLC-load-misses,LLC-store-misses,dTLB-load-misses,dTLB-store-misses,iTLB-load-misses
-- {program} {arg} {arg} ... {arg}


Any info/advice is appreciated.

Thanks.
Andy

             reply	other threads:[~2013-05-31  5:26 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-05-31  5:26 Andrew Davidoff [this message]
2013-05-31  5:41 ` Getting started with perf; a couple of questions David Ahern
2013-05-31  7:09   ` Andrew Davidoff
2013-05-31 20:35     ` Andrew Davidoff
2013-06-06 14:01       ` David Ahern
2013-06-06 18:26         ` Andrew Davidoff
2013-06-07 15:05           ` David Ahern
2013-06-07 23:49             ` Andrew Davidoff
2013-06-08  0:08               ` David Ahern

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