From: "Benjamin Herrenschmidt" <benh@kernel.crashing.org>
To: "Segher Boessenkool" <segher@koffie.nl>
Cc: <linuxppc-dev@lists.linuxppc.org>
Subject: Re: RFC: Performance Monitor Counters device
Date: Thu, 12 Sep 2002 12:25:50 +0200 [thread overview]
Message-ID: <20020912102550.11578@192.168.4.1> (raw)
In-Reply-To: <3D810AF2.2034238C@koffie.nl>
>Benjamin Herrenschmidt wrote:
>> Hrm... you should check the various CPU erratas, I think
>> the perf. counter exception suffers from the same bugs
>> the thermal exceptions has regarding clashing with DEC
>> and thus losing exception context information on some
>> G4s. If this is the case, that would basically prevent
>> using it.
>
>Ooh, that sounds bad! Thanks for the hint.
Yah, and we have to thank MOL for helping us find out
what was going on with the TAU exception easily ;)
The way MOL plays with the DEC made the clash happen
more often, and since it then happened within MOL emulation
context, the MOL kernel module could figure out something
wrong happened, kill the emulator, and stay alive while
printing nice debug informations ;)
If that happened during normal kernel operations, I suspect
we would have just died hard.
Ben.
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2002-09-12 10:25 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-12 20:03 RFC: Performance Monitor Counters device Segher Boessenkool
2002-09-12 9:52 ` Benjamin Herrenschmidt
2002-09-12 21:45 ` Segher Boessenkool
2002-09-12 10:25 ` Benjamin Herrenschmidt [this message]
2002-09-14 11:28 ` Segher Boessenkool
2002-09-15 12:50 ` samuel
2002-09-16 12:38 ` Benjamin Herrenschmidt
2002-09-16 23:50 ` Segher Boessenkool
2002-09-13 3:32 ` Paul Mackerras
2002-09-14 11:36 ` Segher Boessenkool
2002-09-13 10:04 ` Anton Blanchard
2002-09-14 11:39 ` Segher Boessenkool
2002-09-13 22:21 ` David Engebretsen
2002-09-14 11:22 ` Segher Boessenkool
2002-09-16 15:14 ` Dave Engebretsen
2002-09-17 4:59 ` Segher Boessenkool
2002-09-14 4:41 ` Ethan Benson
2002-09-15 1:37 ` Rob Latham
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