From: Mike Galbraith <efault@gmx.de>
To: Peter Zijlstra <peterz@infradead.org>
Cc: linux-rt-users <linux-rt-users@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>,
Oleg Nesterov <oleg@redhat.com>,
Miklos Szeredi <miklos@szeredi.hu>, mingo <mingo@redhat.com>
Subject: Re: rt14: strace -> migrate_disable_atomic imbalance
Date: Thu, 22 Sep 2011 16:05:27 +0200 [thread overview]
Message-ID: <1316700327.4831.2.camel@marge.simson.net> (raw)
In-Reply-To: <1316698943.6348.8.camel@marge.simson.net>
On Thu, 2011-09-22 at 15:42 +0200, Mike Galbraith wrote:
> On Thu, 2011-09-22 at 14:09 +0200, Peter Zijlstra wrote:
> > On Thu, 2011-09-22 at 13:55 +0200, Mike Galbraith wrote:
> > > On Thu, 2011-09-22 at 12:00 +0200, Peter Zijlstra wrote:
> > >
> > > > OK, this one seems to be better.. But its quite vile, not sure I
> > > > actually like it anymore.
> > >
> > > Well, seemed to work, but I see there's a v3 now.
> >
> > Yeah, just posted it for completeness, not sure its actually going
> > anywhere since its slower than the current code (although its hard to
> > say with the results changing from reboot to reboot), and its still
> > quite ugly..
>
> Hm. Stracing this proglet will soon leave it stuck forever unless the
> timer is left running. Virgin rt14 does the same though...
>
> strace ./jitter -c 3 -p 99 -f 1000 -t 10 -r
>
> rt_sigtimedwait([], NULL, NULL, 8) = 64
> timer_settime(0x1, TIMER_ABSTIME, {it_interval={0, 0}, it_value={0, 0}}, NULL) = 0
> timer_settime(0x1, TIMER_ABSTIME, {it_interval={0, 0}, it_value={1316698141, 166759038}}, NULL) = 0
> rt_sigtimedwait([], NULL, NULL, 8) = 64
> timer_settime(0x1, TIMER_ABSTIME, {it_interval={0, 0}, it_value={0, 0}}, NULL) = 0
> timer_settime(0x1, TIMER_ABSTIME, {it_interval={0, 0}, it_value={1316698141, 167822701}}, NULL) = 0
> rt_sigtimedwait([], NULL, NULL, 8) = 64
> timer_settime(0x1, TIMER_ABSTIME, {it_interval={0, 0}, it_value={0, 0}}, NULL) = 0
> timer_settime(0x1, TIMER_ABSTIME, {it_interval={0, 0}, it_value={1316698141, 168887375}}, NULL) = 0
> --- SIGRT_32 (Real-time signal 30) @ 0 (0) ---
> rt_sigreturn(0x40) = 0
> rt_sigtimedwait([], NULL, NULL, 8^C <unfinished ...>
I thought it was RT specific, but it's not after all, a 3.0.4 distro
desktop (preempt) kernel did the same after a bit.
-Mike
next prev parent reply other threads:[~2011-09-22 14:05 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-10 9:12 [ANNOUNCE] 3.0.4-rt13 Thomas Gleixner
2011-09-10 14:53 ` Madovsky
2011-09-10 17:27 ` Rolando Martins
2011-09-11 10:35 ` Mike Galbraith
2011-09-11 10:35 ` Mike Galbraith
2011-09-11 17:01 ` Mike Galbraith
2011-09-12 7:24 ` Thomas Gleixner
2011-09-12 8:59 ` Peter Zijlstra
2011-09-12 9:05 ` Mike Galbraith
2011-09-12 13:52 ` Mike Galbraith
2011-09-12 14:53 ` Mike Galbraith
2011-09-13 13:36 ` Peter Zijlstra
2011-09-13 15:17 ` Mike Galbraith
2011-09-13 15:08 ` Peter Zijlstra
2011-09-13 15:28 ` Mike Galbraith
2011-09-13 16:13 ` Peter Zijlstra
2011-09-21 10:17 ` rt14: strace -> migrate_disable_atomic imbalance Mike Galbraith
2011-09-21 17:01 ` Peter Zijlstra
2011-09-21 18:50 ` Peter Zijlstra
2011-09-21 18:50 ` Peter Zijlstra
2011-09-22 4:46 ` Mike Galbraith
2011-09-22 6:31 ` Peter Zijlstra
2011-09-22 8:38 ` Peter Zijlstra
2011-09-22 10:00 ` Peter Zijlstra
2011-09-22 10:00 ` Peter Zijlstra
2011-09-22 11:55 ` Mike Galbraith
2011-09-22 12:09 ` Peter Zijlstra
2011-09-22 13:42 ` Mike Galbraith
2011-09-22 14:05 ` Mike Galbraith [this message]
2011-09-22 15:20 ` Peter Zijlstra
2011-09-22 14:34 ` Peter Zijlstra
2011-09-22 14:38 ` Mike Galbraith
2011-09-22 14:41 ` Mike Galbraith
2011-09-22 14:41 ` Peter Zijlstra
2011-09-22 14:46 ` Mike Galbraith
2011-09-22 14:46 ` Mike Galbraith
2011-09-22 11:31 ` Peter Zijlstra
2011-09-22 11:46 ` Peter Zijlstra
2011-09-22 11:46 ` Peter Zijlstra
2011-09-22 14:52 ` Oleg Nesterov
2011-09-22 15:13 ` Peter Zijlstra
2011-09-14 9:57 ` [PATCH -rt] ipc/sem: Rework semaphore wakeups Peter Zijlstra
2011-09-14 13:02 ` Mike Galbraith
2011-09-14 18:48 ` Manfred Spraul
2011-09-14 19:23 ` Peter Zijlstra
2011-09-15 17:04 ` Manfred Spraul
2011-09-12 10:04 ` [ANNOUNCE] 3.0.4-rt13 Peter Zijlstra
2011-09-12 11:33 ` Mike Galbraith
2011-09-11 18:14 ` Mike Galbraith
2011-09-12 7:33 ` Thomas Gleixner
2011-09-12 8:05 ` Mike Galbraith
2011-09-12 8:43 ` Mike Galbraith
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