From: "Luck, Tony" <tony.luck@intel.com>
To: linux-ia64@vger.kernel.org
Subject: RE: [Linux-ia64] [PATCH] Support for alternative kernel profiler
Date: Thu, 10 Jan 2002 23:26:58 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590698805802@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-105590698805742@msgid-missing>
We don't currently have any way for different software packages
to share the performance counters, so it's very likely that there
would be interactions with Stephane's PMU code (e.g. I rewrite
cr.pmv to a new vector and re-write all of the pmc[] and pmd[]
registers for my own purposes ... this will upset Stephane's code,
similarly my code does not expect anyone else to touch any PMU
registers, or fiddle with psr.pp/dcr.pp).
It would probably be safest to turn off CONFIG_PERFMON in a kernel
that is going to load an alternate profiler ... my profiler seems
to cope ok provided nobody calls sys_perfmonctl().
-Tony
David Mosberger wrote:
> I'd like Stephane to take a look at this patch and see whether there
> are any potential bad interactions with the PMU code he is working on
> (due to the manipulation of the psr.pp bit). Other than that, the
> patch looks good to me.
next prev parent reply other threads:[~2002-01-10 23:26 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-05 1:03 [Linux-ia64] [PATCH] Support for alternative kernel profiler in a module Luck, Tony
2002-01-09 21:37 ` [Linux-ia64] [PATCH] Support for alternative kernel profiler Luck, Tony
2002-01-10 19:25 ` David Mosberger
2002-01-10 19:27 ` David Mosberger
2002-01-10 23:26 ` Luck, Tony [this message]
2002-01-10 23:37 ` David Mosberger
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