From: Ingo Molnar <mingo@elte.hu>
To: john stultz <johnstul@us.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>,
tglx@linutronix.de, linux-kernel@vger.kernel.org
Subject: Re: Ktimer / -rt9 (+custom) monotonic_clock going backwards.
Date: Thu, 20 Oct 2005 21:32:14 +0200 [thread overview]
Message-ID: <20051020193214.GA21613@elte.hu> (raw)
In-Reply-To: <1129826750.27168.163.camel@cog.beaverton.ibm.com>
* john stultz <johnstul@us.ibm.com> wrote:
> > > John, would this cause any problems to keep cycle_t at s64?
> >
> > I mean at u64.
>
> Performance would be the only concern. It had been a u64 before I
> started optimizing the code a bit.
no, this is really a bad optimization that causes unrobustness.
Correctness and robustness comes first. It is so easy to cause a
500-1000msec delay in the kernel, due to a bad driver or anything. The
timekeeping code should not break like that.
Ingo
next prev parent reply other threads:[~2005-10-20 19:32 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-19 14:59 Ktimer / -rt9 (+custom) monotonic_clock going backwards Steven Rostedt
2005-10-19 15:10 ` Thomas Gleixner
2005-10-19 18:39 ` john stultz
2005-10-20 6:55 ` Steven Rostedt
2005-10-20 7:34 ` Ingo Molnar
2005-10-20 7:46 ` Steven Rostedt
2005-10-20 8:01 ` Ingo Molnar
2005-10-20 8:56 ` Steven Rostedt
2005-10-20 8:59 ` Ingo Molnar
2005-10-20 9:04 ` Steven Rostedt
2005-10-20 9:05 ` Steven Rostedt
2005-10-20 10:05 ` Steven Rostedt
2005-10-20 10:05 ` Steven Rostedt
2005-10-20 15:55 ` Ingo Molnar
2005-10-20 16:09 ` Steven Rostedt
2005-10-20 16:45 ` john stultz
2005-10-20 16:58 ` Steven Rostedt
2005-10-20 17:05 ` john stultz
2005-10-20 19:32 ` Ingo Molnar [this message]
2005-10-20 20:05 ` john stultz
2005-10-20 20:54 ` Ingo Molnar
2005-10-21 6:03 ` Steven Rostedt
2005-10-21 7:49 ` Thomas Gleixner
2005-10-21 7:57 ` Steven Rostedt
2005-10-21 8:00 ` ktimer API Steven Rostedt
2005-10-21 8:09 ` Thomas Gleixner
2005-10-21 18:09 ` Ktimer / -rt9 (+custom) monotonic_clock going backwards john stultz
2005-10-21 18:15 ` Thomas Gleixner
2005-10-20 22:06 ` George Anzinger
2005-10-20 6:19 ` Steven Rostedt
2005-10-20 14:34 ` Steven Rostedt
2005-10-20 15:18 ` Steven Rostedt
2005-10-20 15:23 ` Steven Rostedt
2005-10-20 16:01 ` Steven Rostedt
2005-10-19 15:11 ` Ingo Molnar
2005-10-20 6:38 ` Steven Rostedt
2005-10-20 6:56 ` Ingo Molnar
2005-10-19 15:21 ` Daniel Walker
2005-10-20 6:39 ` Steven Rostedt
2005-10-20 15:02 ` Daniel Walker
2005-10-20 22:19 ` George Anzinger
2005-10-20 23:23 ` john stultz
2005-10-19 16:44 ` Frank Sorenson
2005-10-20 6:43 ` Steven Rostedt
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=20051020193214.GA21613@elte.hu \
--to=mingo@elte.hu \
--cc=johnstul@us.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=rostedt@goodmis.org \
--cc=tglx@linutronix.de \
/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.