From: Robert Love <rml@tech9.net>
To: Valdis.Kletnieks@vt.edu
Cc: Hanna Linder <hannal@us.ibm.com>,
lse-tech@lists.sourceforge.net, linux-kernel@vger.kernel.org
Subject: Re: [RFT] port of Lockmeter on i386 2.5.64 Patch
Date: 10 Mar 2003 00:36:56 -0500 [thread overview]
Message-ID: <1047274616.7865.11.camel@phantasy.awol.org> (raw)
In-Reply-To: <200303100533.h2A5XoWS003419@turing-police.cc.vt.edu>
On Mon, 2003-03-10 at 00:33, Valdis.Kletnieks@vt.edu wrote:
> > +config LOCKMETER
> > + bool "Kernel lock metering"
> > + depends on SMP
>
> Should that be 'depends on SMP || PREEMPT'? I remember the original 2.4
> pre-empt patches had one to deal with instrumenting/breaking locks. Not sure
> if that logic still applies...
No, it depends on SMP alone.
To do the metering, it needs the actual locks compiled into the kernel.
I believe what you are thinking of is the preempt-stats patch, which
measures periods of non-preemptibility. Same idea but different.
Robert Love
prev parent reply other threads:[~2003-03-10 5:26 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-10 2:48 Hanna Linder
2003-03-10 3:00 ` [Lse-tech] " William Lee Irwin III
2003-03-10 5:33 ` Valdis.Kletnieks
2003-03-10 5:36 ` Robert Love [this message]
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