linux-kernel - Re: Using a new perf tool against an older kernel

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Message-ID: <4E03DDB0.3050502@fb.com>
Date:	Thu, 23 Jun 2011 17:43:28 -0700
From:	Arun Sharma <asharma@...com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	David Ahern <dsahern@...il.com>, linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Using a new perf tool against an older kernel

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!

  -Arun

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