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

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Date:	Wed, 3 Jan 2007 17:00:49 -0800
From:	Bill Huey (hui) <billh@...ppy.monkey.org>
To:	"Chen, Tim C" <tim.c.chen@...el.com>
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>,
	"Bill Huey (hui)" <billh@...ppy.monkey.org>
Subject: Re: [PATCH] lock stat for -rt 2.6.20-rc2-rt2.2.lock_stat.patch

On Wed, Jan 03, 2007 at 04:46:37PM -0800, Chen, Tim C wrote:
> 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 ? :)
... 
> @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}

Thanks, the numbers look a bit weird in that the first column should
have a bigger number of events than that second column since it is a
special case subset. Looking at the lock_stat_note() code should show
that to be the case. Did you make a change to the output ?

I can't tell which are "steal", actively running or overall contention
stats against the lock from your output.

Thanks

bill

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