From: Stephane Eranian <eranian@frankl.hpl.hp.com>
To: linux-ia64@vger.kernel.org
Subject: Re: [Linux-ia64] Preempt problems
Date: Mon, 03 Feb 2003 21:36:26 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590709805803@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-105590709805801@msgid-missing>
Peter,
On Tue, Feb 04, 2003 at 07:17:01AM +1100, Peter Chubb wrote:
>
> Hi David,
> Just a heads up --- there are still two major problems with the
> patch I submitted for preemption support, so I suggest you don't merge
> it yet (although I'd very much appreciate having it reviewed and
> tested by third parties).
>
> The two problems I see are:
> -- perfmon missing interrupts *even with CONFIG_PREEMPT turned
> off!*
As for perfmon, there are some known issues with perfmon and the O(1)
scheduler (deadlocks during ctxsw in SMP). I am not sure it affects your
particular test case. I had postponed fixing this because I am working on
a new perfmon code base for 2.5 in which (hopefully) all problems are gone.
However a somewhat related issue came up last week and I decided to fix
some of the problems. I will try to give a new patch to David this week.
As for preemption and perfmon, I haven't had a chance to look at the patch
yet. There are some assumptions about not being preemptable at several places.
--
-Stephane
next prev parent reply other threads:[~2003-02-03 21:36 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-03 20:17 [Linux-ia64] Preempt problems Peter Chubb
2003-02-03 21:36 ` Stephane Eranian [this message]
2003-02-03 22:33 ` Peter Chubb
2003-02-03 23:43 ` David Mosberger
2003-02-05 17:03 ` Joel GUILLET
2003-02-14 20:05 ` Ray Bryant
2003-02-14 20:11 ` Stephane Eranian
2003-02-14 21:04 ` Ray Bryant
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=marc-linux-ia64-105590709805803@msgid-missing \
--to=eranian@frankl.hpl.hp.com \
--cc=linux-ia64@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.