From: Ingo Molnar <mingo@elte.hu>
To: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org,
Rob van der Heij <rvdheij@gmail.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
john stultz <johnstul@us.ibm.com>,
Andi Kleen <andi@firstfloor.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [patch 0/2] NOHZ vs. profile/oprofile v2
Date: Mon, 22 Jun 2009 17:05:53 +0200 [thread overview]
Message-ID: <20090622150553.GA14363@elte.hu> (raw)
In-Reply-To: <20090622165936.0bb776e1@skybase>
* Martin Schwidefsky <schwidefsky@de.ibm.com> wrote:
> On Mon, 22 Jun 2009 16:41:10 +0200
> Ingo Molnar <mingo@elte.hu> wrote:
>
> > Hm, this is rather ugly. Why not use hrtimers like 'perf' does when
> > it fallback-samples based on the timer tick?
> >
> > That method has three advantages:
> >
> > - no weird hookery needed
> > - resolution can go far beyond HZ
> > - it is evidently dynticks-safe
>
> Hmm, if we replace the HZ based oprofile tick with an hrtimer we
> should add an interface to configure the sample interval as well,
> no? Otherwise we just replace one timer event (HZ) with another
> (hrtimer).
Even if the hrtimer is set with a 1/HZ period it's a better
solution, as it's dynticks safe without invasive changes.
Ingo
next prev parent reply other threads:[~2009-06-22 15:06 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-03 15:22 [patch 0/2] NOHZ vs. profile/oprofile v2 Martin Schwidefsky
2009-06-03 15:22 ` [patch 1/2] idle profile hits with NOHZ Martin Schwidefsky
2009-06-03 15:22 ` [patch 2/2] keep on ticking if oprofile is active Martin Schwidefsky
2009-06-09 20:52 ` [patch 0/2] NOHZ vs. profile/oprofile v2 Thomas Gleixner
2009-06-10 17:33 ` Martin Schwidefsky
2009-06-22 14:26 ` Martin Schwidefsky
2009-06-22 14:41 ` Ingo Molnar
2009-06-22 14:59 ` Martin Schwidefsky
2009-06-22 15:05 ` Ingo Molnar [this message]
2009-06-22 15:18 ` Martin Schwidefsky
2009-06-22 15:29 ` Ingo Molnar
2009-06-22 15:36 ` Martin Schwidefsky
2009-06-22 15:40 ` Ingo Molnar
2009-06-22 16:37 ` Martin Schwidefsky
2009-06-24 16:51 ` Martin Schwidefsky
2009-06-24 17:47 ` Ingo Molnar
2010-03-02 13:57 ` Aaro Koskinen
2010-03-02 15:01 ` Martin Schwidefsky
2010-03-02 15:08 ` Thomas Gleixner
2010-03-02 15:25 ` Martin Schwidefsky
2010-03-02 15:38 ` Robert Richter
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=20090622150553.GA14363@elte.hu \
--to=mingo@elte.hu \
--cc=a.p.zijlstra@chello.nl \
--cc=andi@firstfloor.org \
--cc=heiko.carstens@de.ibm.com \
--cc=johnstul@us.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=rvdheij@gmail.com \
--cc=schwidefsky@de.ibm.com \
--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.