From: Arnd Bergmann <arnd@arndb.de>
To: Anton Blanchard <anton@samba.org>
Cc: Bryan Rosenburg <rosnbrg@us.ibm.com>,
linuxppc-dev@ozlabs.org, Nathan Lynch <ntl@pobox.com>,
Paul Mackerras <paulus@samba.org>,
Christopher Yeoh <cyeoh@samba.org>
Subject: Re: [PATCH 0/3] powerpc: Instrument Hypervisor Calls
Date: Sat, 15 Jul 2006 18:42:26 +0200 [thread overview]
Message-ID: <200607151842.27568.arnd@arndb.de> (raw)
In-Reply-To: <20060715153053.GK31081@krispykreme>
On Saturday 15 July 2006 17:30, Anton Blanchard wrote:
> > What happened to the question whether to use PURR values for also measuring
> > cycles spent executing the hcall as opposed to cycles that passed before
> > the hcall returns. Did that turn out not giving extra information after all
> > or was there a different reason to drop that idea?
>
> You have to be careful with PURR since it may be context switched
> between partitions.
>
Not sure I follow you. I would expect the PURR value to be restored after
a context switch, even if we continue on a different physical CPU.
The idea behind monitoring both PURR and timebase is that the difference
between the two tells you how long the partition was suspended during
the hcall.
Arnd <><
next prev parent reply other threads:[~2006-07-15 16:42 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-14 23:37 [PATCH 0/3] powerpc: Instrument Hypervisor Calls Mike Kravetz
2006-07-14 23:39 ` [PATCH 1/3] powerpc: Instrument Hypervisor Calls: merge headers Mike Kravetz
2006-07-14 23:40 ` [PATCH 2/3] powerpc: Instrument Hypervisor Calls: add wrappers Mike Kravetz
2006-07-15 0:15 ` Nathan Lynch
2006-07-15 0:41 ` Mike Kravetz
2006-07-15 8:03 ` Nathan Lynch
2006-07-14 23:41 ` [PATCH 3/3] powerpc: Instrument Hypervisor Calls: add debugfs files Mike Kravetz
2006-07-15 0:00 ` [PATCH 0/3] powerpc: Instrument Hypervisor Calls Arnd Bergmann
2006-07-15 0:06 ` Mike Kravetz
2006-07-15 15:30 ` Anton Blanchard
2006-07-15 16:42 ` Arnd Bergmann [this message]
2006-07-15 22:07 ` Anton Blanchard
2006-07-16 23:02 ` Luke Browning
2006-07-17 2:02 ` Luke Browning
2006-07-16 3:53 ` Olof Johansson
2006-07-16 22:53 ` Luke Browning
2006-07-16 23:09 ` Olof Johansson
-- strict thread matches above, loose matches on Subject: below --
2006-07-21 6:38 Mike Kravetz
2006-07-18 20:47 Mike Kravetz
2006-07-18 21:00 ` Paul Mackerras
2006-07-19 3:36 ` Mike Kravetz
2006-07-19 22:11 ` Mike Kravetz
2006-07-18 21:29 ` Mike Kravetz
2006-07-18 22:38 ` Olof Johansson
2006-06-22 22:56 Mike Kravetz
2006-06-23 0:28 ` Segher Boessenkool
2006-07-10 20:35 ` Mike Kravetz
2006-07-10 20:49 ` Arnd Bergmann
2006-07-12 18:05 ` Mike Kravetz
2006-06-14 3:47 Mike Kravetz
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=200607151842.27568.arnd@arndb.de \
--to=arnd@arndb.de \
--cc=anton@samba.org \
--cc=cyeoh@samba.org \
--cc=linuxppc-dev@ozlabs.org \
--cc=ntl@pobox.com \
--cc=paulus@samba.org \
--cc=rosnbrg@us.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.