From: Mike Kravetz <kravetz@us•ibm.com>
To: Paul Mackerras <paulus@samba•org>
Cc: linuxppc-dev@ozlabs•org
Subject: Re: Collecting hypervisor call stats
Date: Wed, 31 May 2006 15:58:13 -0700 [thread overview]
Message-ID: <20060531225813.GC7909@w-mikek2.ibm.com> (raw)
In-Reply-To: <17534.7026.169023.420733@cargo.ozlabs.ibm.com>
On Thu, Jun 01, 2006 at 08:40:50AM +1000, Paul Mackerras wrote:
> I think that gathering those statistics would be useful. I suggest
> you use a per-cpu array for them, to reduce the performance impact.
Yes, that is a must do.
We need to get a timestamp before and after the call. mftb should do
the trick. Also, I'd prefer to have the code that stuffs the values
into the array be C. So, the decision is to have the assembly code
call out to the C routine -OR- create wrappers for the assembly routines.
I much prefer C wrappers to touching the assembly.
--
Mike
next prev parent reply other threads:[~2006-05-31 22:58 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-31 20:41 Collecting hypervisor call stats Mike Kravetz
2006-05-31 21:25 ` Geoff Levand
2006-05-31 22:40 ` Paul Mackerras
2006-05-31 22:58 ` Mike Kravetz [this message]
2006-06-01 5:26 ` Benjamin Herrenschmidt
2006-06-01 18:14 ` Arnd Bergmann
2006-06-01 21:57 ` Benjamin Herrenschmidt
2006-06-01 4:34 ` Jimi Xenidis
2006-06-01 5:12 ` Christopher Yeoh
2006-06-06 16:46 ` Mike Kravetz
2006-06-07 1:08 ` Christopher Yeoh
2006-06-07 22:57 ` Segher Boessenkool
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