From: Yury Polyanskiy <ypolyans@princeton.edu>
To: Joel Becker <Joel.Becker@oracle.com>
Cc: linux-kernel@vger.kernel.org, Andrew Morton <akpm@osdl.org>,
john stultz <johnstul@us.ibm.com>,
Jan Glauber <jan.glauber@de.ibm.com>
Subject: Re: [PATCH] hangcheck-timer is broken on x86
Date: Fri, 26 Mar 2010 18:00:25 -0400 [thread overview]
Message-ID: <20100326180025.052d930f@penta.localdomain> (raw)
In-Reply-To: <20100326214648.GF9984@mail.oracle.com>
[-- Attachment #1: Type: text/plain, Size: 782 bytes --]
On Fri, 26 Mar 2010 14:46:49 -0700
Joel Becker <Joel.Becker@oracle.com> wrote:
> On Tue, Mar 23, 2010 at 11:36:11PM -0400, Yury Polyanskiy wrote:
> 1) Does getrawmonotonic() satisfy hangcheck-timer? What I mean is, will
> it always return the wallclock nanoseconds even in the face of CPU speed
> changes, suspend, udelay, or any other suspension of kernel operation?
> Yes, I know this is a tougher standard than rdtsc(), but this is what
> hangcheck-timer wants. rdtsc() at least satisfied udelay and PCI hangs.
Yes, as far as I can tell. Note that rdtsc is hosed on suspend-resume.
>
> 2) If it does satisfy, why not use it for all hangcheck usage instead of
> any ifdefs?
On my part, I didn't want to touch the S390 code since I can't test it.
Yury
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 198 bytes --]
next prev parent reply other threads:[~2010-03-26 22:01 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-24 3:36 [PATCH] hangcheck-timer is broken on x86 Yury Polyanskiy
2010-03-26 21:24 ` Andrew Morton
2010-03-26 21:52 ` Yury Polyanskiy
2010-03-26 21:46 ` Joel Becker
2010-03-26 22:00 ` Yury Polyanskiy [this message]
2010-03-27 0:57 ` Joel Becker
2010-03-27 2:02 ` Yury Polyanskiy
2010-03-27 22:03 ` Joel Becker
2010-03-27 22:51 ` Yury Polyanskiy
2010-03-27 23:36 ` Joel Becker
2010-03-28 2:08 ` Yury Polyanskiy
2010-03-29 1:00 ` john stultz
2010-03-29 14:11 ` Yury Polyanskiy
2010-03-29 16:43 ` john stultz
2010-03-29 17:04 ` Yury Polyanskiy
2010-03-29 18:44 ` john stultz
2010-03-29 19:53 ` Joel Becker
2010-03-29 21:08 ` Yury Polyanskiy
2010-03-29 21:43 ` john stultz
2010-03-29 22:34 ` Yury Polyanskiy
2010-04-08 0:52 ` Joel Becker
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=20100326180025.052d930f@penta.localdomain \
--to=ypolyans@princeton.edu \
--cc=Joel.Becker@oracle.com \
--cc=akpm@osdl.org \
--cc=jan.glauber@de.ibm.com \
--cc=johnstul@us.ibm.com \
--cc=linux-kernel@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.