Re: Using a new perf tool against an older kernel

From: Arun Sharma
Date: Thu Jun 23 2011 - 20:42:42 EST

On 6/23/11 5:11 PM, Frederic Weisbecker wrote:

I'm confused, you first said it happens with new tools on older kernel.

Can you tell us which combination of kernel/user raises the error? and
which error.

perf-3.0 + 2.6.38

perf record -agR gives:

Can't find id 9's machine
Found 1 unknown events!

perf-3.0 + 2.6.32

perf record -ag
perf script

samples have bogus timestamps

perf-3.0 + 2.6.32

perf record -agR
perf script

error: Samples do not contain timestamps

perf-3.0 + any kernel

perf record -agT
perf script

is happy everywhere. Thanks!


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