From: Rudo Thomas <rudo@matfyz.cz>
To: Ingo Molnar <mingo@elte.hu>
Cc: Lee Revell <rlrevell@joe-job.com>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: preempt timing violations (unmap_vmas)
Date: Mon, 26 Jul 2004 17:43:12 +0200 [thread overview]
Message-ID: <20040726154312.GA28607@ss1000.ms.mff.cuni.cz> (raw)
In-Reply-To: <20040726085002.GA25519@elte.hu>
Hello.
> > 2ms non-preemptible critical section violated 1 ms preempt threshold
> > starting at unmap_vmas+0x1ff/0x210 and ending at
> > unmap_vmas+0x1f5/0x210
>
> this is the normal sys_exit()->exit_mmap()->unmap_vmas() path. It's
> weird that it generated a 2ms latency. What are the values of
> voluntary_preemption and kernel_preemption on your current kernel? With
> a 2:0 setting we ought to have a reschedule point every 32 pages. Do
> you know which application triggers this latency and is it easy to
> reproduce?
I discovered that I got two of these in a row. The settings are 2:1, but I am
not able to reproduce it.
Rudo.
prev parent reply other threads:[~2004-07-26 16:54 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-26 3:51 preempt timing violations Lee Revell
2004-07-26 8:50 ` Ingo Molnar
2004-07-26 9:09 ` Lee Revell
2004-07-26 9:22 ` Ingo Molnar
2004-07-26 9:25 ` Ingo Molnar
2004-07-26 15:43 ` Rudo Thomas [this message]
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=20040726154312.GA28607@ss1000.ms.mff.cuni.cz \
--to=rudo@matfyz.cz \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=rlrevell@joe-job.com \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®