linux-kernel - Re: Trace event testing time

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Message-Id: <1252942130.2964.148.camel@localhost.localdomain>
Date:	Mon, 14 Sep 2009 11:28:50 -0400
From:	Steven Rostedt <srostedt@...hat.com>
To:	Parag Warudkar <parag.lkml@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: Trace event testing time - 3s to 41s

On Sun, 2009-09-13 at 11:15 -0400, Parag Warudkar wrote:
> Somewhere between -rc9 and yesterday's git, my desktop went from using
> 3s worth of trace event testing time to 41s !
> 
> It looks like we not only added a whole bunch of tracing points but
> also are doing the tests twice post -rc9 - the addition being testing
> with function tracer.
> 
> grep "Testing event" dmesg.31rc9 |wc -l
> 100
> 
> grep "Testing event" dmesg.31git |wc -l
> 1172

This was due to the fact that we test every syscall now.

> 
> While one could get away with "don't enable that config option then"
> response, for testing kernels daily this sounds like it is going to be
> very annoying as it adds a considerable boot lag.
> 
> So I was thinking could we move this testing to a kthread with idle
> priority or something - may be disabling tracing until those tests are
> finished, if that sort of thing is necessary?
> Or does it need to happen synchronous to booting?

I don't have time at the moment, but I would not mind moving the syscall
testing to a thread. Heck, that way we can actually test syscalls
too ;-)

-- Steve


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