linux-kernel - RE: [PATCH] lock stat for -rt 2.6.20-rc2-rt2.2.lock

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Date:	Wed, 3 Jan 2007 16:46:37 -0800
From:	"Chen, Tim C" <tim.c.chen@...el.com>
To:	"Bill Huey \(hui\)" <billh@...ppy.monkey.org>
Cc:	"Ingo Molnar" <mingo@...e.hu>, <linux-kernel@...r.kernel.org>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Steven Rostedt" <rostedt@...dmis.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Daniel Walker" <dwalker@...sta.com>
Subject: RE: [PATCH] lock stat for -rt 2.6.20-rc2-rt2.2.lock_stat.patch

Bill Huey (hui) wrote:
> Can you sort the output ("sort -n" what ever..) and post it without
> the zeroed entries ?
> 
> I'm curious about how that statistical spike compares to the rest of
> the system activity. I'm sure that'll get the attention of Peter as
> well and maybe he'll do something about it ? :)
> 

Here's the lockstat trace.  You can cross reference it with my
earlier post.  
http://marc.theaimsgroup.com/?l=linux-kernel&m=116743637422465&w=2

The contention happened on mm->mmap_sem shared
by the java threads during futex_wake's invocation of _rt_down_read.

Tim

@contention events = 247149
@failure_events = 146
@lookup_failed_scope = 175
@lookup_failed_static = 43
@static_found = 16
[1, 113, 77 -- 32768, 0]            {tcp_init, net/ipv4/tcp.c, 2426}
[2, 759, 182 -- 1, 0]           	{lock_kernel, -, 0}
[13, 0, 7 -- 4, 0]              	{kmem_cache_free, -, 0}
[25, 3564, 9278 -- 1, 0]            {lock_timer_base, -, 0}
[56, 9528, 24552 -- 3, 0]           {init_timers_cpu, kernel/timer.c,
1842}
[471, 52845, 17682 -- 10448, 0]     {sock_lock_init, net/core/sock.c,
817}
[32251, 9024, 242 -- 256, 0]        {init, kernel/futex.c, 2781}
[173724, 11899638, 9886960 -- 11194, 0]         {mm_init, kernel/fork.c,
369}
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