From: <spaminos-ker@yahoo.com>
To: Peter Williams <pwil3058@bigpond.net.au>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Scheduler fairness problem on 2.6 series (Attn: Nick Piggin and others)
Date: Fri, 27 Aug 2004 18:59:37 -0700 (PDT) [thread overview]
Message-ID: <20040828015937.50607.qmail@web13902.mail.yahoo.com> (raw)
In-Reply-To: <412DA1C3.6020505@bigpond.net.au>
--- Peter Williams <pwil3058@bigpond.net.au> wrote:
> A (gzipped) combined ZAPHOD and P9 voluntary preempt patch for 2.6.8.1
> is available at:
>
>
<http://prdownloads.sourceforge.net/cpuse/patch-2.6.8.1-zaphod-vp-v5.0.1.gz?download>
>
> This patch has had minimal testing so use with care and please let me
> know if there are any problems.
>
I tried this patch, and I get a pretty high latency in "sub_preempt_count"
00000001 0.730ms (+0.730ms): sub_preempt_count (_mmx_memcpy)
I am not sure if that makes sense and what it means.
Nicolas
Here are the full messages:
Aug 27 18:42:11 localhost kernel: (events/0/4): new 730 us maximum-latency
critical section.
Aug 27 18:42:11 localhost kernel: => started at: <kernel_fpu_begin+0x21/0x60>
Aug 27 18:42:11 localhost kernel: => ended at: <_mmx_memcpy+0x131/0x180>
Aug 27 18:42:11 localhost kernel: [<c014106a>]
check_preempt_timing+0x1aa/0x240
Aug 27 18:42:11 localhost kernel: [<c0225751>] _mmx_memcpy+0x131/0x180
Aug 27 18:42:11 localhost kernel: [<c0225751>] _mmx_memcpy+0x131/0x180
Aug 27 18:42:11 localhost kernel: [<c0141244>] sub_preempt_count+0x54/0x60
Aug 27 18:42:11 localhost kernel: [<c0141244>] sub_preempt_count+0x54/0x60
Aug 27 18:42:11 localhost kernel: [<c0225751>] _mmx_memcpy+0x131/0x180
Aug 27 18:42:11 localhost kernel: [<c02dd9fe>] vgacon_save_screen+0x7e/0x80
Aug 27 18:42:11 localhost kernel: [<c0267d32>] do_blank_screen+0x182/0x2b0
Aug 27 18:42:11 localhost kernel: [<c0122fa4>] acquire_console_sem+0x44/0x70
Aug 27 18:42:11 localhost kernel: [<c0266ab2>] console_callback+0x72/0xf0
Aug 27 18:42:11 localhost kernel: [<c0134dcb>] worker_thread+0x1eb/0x2d0
Aug 27 18:42:11 localhost kernel: [<c0266a40>] console_callback+0x0/0xf0
Aug 27 18:42:11 localhost kernel: [<c011c000>] default_wake_function+0x0/0x20
Aug 27 18:42:11 localhost kernel: [<c011c000>] default_wake_function+0x0/0x20
Aug 27 18:42:11 localhost kernel: [<c013963c>] kthread+0xbc/0xd0
Aug 27 18:42:11 localhost kernel: [<c0134be0>] worker_thread+0x0/0x2d0
Aug 27 18:42:11 localhost kernel: [<c0139580>] kthread+0x0/0xd0
Aug 27 18:42:11 localhost kernel: [<c0104389>] kernel_thread_helper+0x5/0xc
preemption latency trace v1.0.2
-------------------------------
latency: 730 us, entries: 4 (4)
-----------------
| task: events/0/4, uid:0 nice:-10 policy:0 rt_prio:0
-----------------
=> started at: kernel_fpu_begin+0x21/0x60
=> ended at: _mmx_memcpy+0x131/0x180
=======>
00000001 0.000ms (+0.000ms): kernel_fpu_begin (_mmx_memcpy)
00000001 0.730ms (+0.730ms): sub_preempt_count (_mmx_memcpy)
00000001 0.730ms (+0.000ms): _mmx_memcpy (check_preempt_timing)
00000001 0.730ms (+0.000ms): kernel_fpu_begin (_mmx_memcpy)
next prev parent reply other threads:[~2004-08-28 1:59 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <411D50AE.5020005@bigpond.net.au>
2004-08-17 23:19 ` spaminos-ker
2004-08-18 0:12 ` Peter Williams
2004-08-24 21:11 ` spaminos-ker
2004-08-24 23:04 ` Peter Williams
2004-08-24 23:22 ` Lee Revell
2004-08-26 2:30 ` spaminos-ker
2004-08-26 2:42 ` Peter Williams
2004-08-26 8:39 ` Peter Williams
2004-08-28 1:59 ` spaminos-ker [this message]
2004-08-29 0:21 ` Peter Williams
2004-08-29 0:25 ` Lee Revell
2004-08-29 0:45 ` Lee Revell
2004-08-29 2:03 ` Peter Williams
2004-08-29 2:28 ` spaminos-ker
2004-08-29 4:53 ` Peter Williams
2004-08-29 1:19 ` spaminos-ker
2004-08-29 1:22 ` Lee Revell
2004-08-29 1:31 ` Peter Williams
2004-09-13 20:09 ` spaminos-ker
2004-08-29 2:20 ` Lee Revell
[not found] <20040811093945.GA10667@elte.hu>
2004-08-17 23:08 ` spaminos-ker
[not found] <20040811010116.GL11200@holomorphy.com>
2004-08-11 2:21 ` spaminos-ker
2004-08-11 2:23 ` William Lee Irwin III
2004-08-11 2:45 ` Peter Williams
2004-08-11 2:47 ` Peter Williams
2004-08-11 3:23 ` Peter Williams
2004-08-11 3:31 ` Con Kolivas
2004-08-11 3:46 ` Peter Williams
2004-08-11 3:44 ` Peter Williams
2004-08-13 0:13 ` spaminos-ker
2004-08-13 1:44 ` Peter Williams
2004-08-11 3:09 ` Con Kolivas
2004-08-11 10:24 ` Prakash K. Cheemplavam
2004-08-12 2:04 ` spaminos-ker
2004-08-12 2:24 ` spaminos-ker
2004-08-12 2:53 ` Con Kolivas
2004-08-07 21:53 spaminos-ker
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