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From: Jesse Barnes <jbarnes@engr.sgi.com>
To: wli@holomorphy.org, linux-kernel@vger.kernel.org
Cc: steiner@sgi.com, edwardsg@sgi.com
Subject: contention on profile_lock
Date: Tue, 2 Nov 2004 11:52:15 -0800	[thread overview]
Message-ID: <200411021152.16038.jbarnes@engr.sgi.com> (raw)

Hmm, the last patch you sent me worked ok, so I'm not sure why we're seeing 
problems with profiling now.  There seems to be very heavy contention on 
profile_lock since profile_hook is called unconditionally every timer tick.  
Should it only be called if profiling is enabled?  Is there a way we can 
check the notifier list to see if it's empty before calling it or something?  
The only user appears to be oprofile timer based profiling, so in the general 
case we're taking the profile_lock and not doing anything.

Thanks,
Jesse

             reply	other threads:[~2004-11-02 19:56 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-11-02 19:52 Jesse Barnes [this message]
2004-11-02 20:02 ` Jack Steiner
2004-11-02 21:42   ` Jesse Barnes
2004-11-04 19:56     ` Jesse Barnes
2004-11-04 20:12       ` William Lee Irwin III
2004-11-04 20:49         ` Jesse Barnes
2004-11-04 21:51           ` John Levon
2004-11-04 22:08             ` Jesse Barnes
2004-11-04 21:55           ` Jesse Barnes
2004-11-04 22:16             ` Dipankar Sarma
2004-11-04 22:21             ` John Levon
2004-11-04 22:27               ` Jesse Barnes
2004-11-04 22:52                 ` John Levon

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