From: Ingo Molnar <mingo@elte.hu>
To: linux-ia64@vger.kernel.org
Subject: Re: [PATCH] SN2 user-MMIO CPU migration
Date: Tue, 24 Jan 2006 09:02:35 +0000 [thread overview]
Message-ID: <20060124090235.GA673@elte.hu> (raw)
In-Reply-To: <20060118163305.Y42462@chenjesu.americas.sgi.com>
* Brent Casavant <bcasavan@sgi.com> wrote:
> I agree with him that it's not wonderful to hook into mainline
> scheduler code to solve this, but the alternative is what I presented
> here: check if old CPU = new CPU at each context switch-in, entirely
> within IA64 code.
what's the problem with doing that? It's a single comparison [of two
values we already have accessed in that function!] and a rarely taken
branch in a single subarch of a single arch's switch_to() function. If
this use (of migration related arch functionality) becomes more
widespread then we can generalize it, but right now i just dont see the
point, given that the two solutions are almost totally equivalent in
terms of "overhead".
Ingo
next prev parent reply other threads:[~2006-01-24 9:02 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-20 0:06 [PATCH] SN2 user-MMIO CPU migration Brent Casavant
2006-01-20 2:18 ` Jesse Barnes
2006-01-20 6:47 ` Brent Casavant
2006-01-20 17:36 ` Jesse Barnes
2006-01-20 20:01 ` Brent Casavant
2006-01-20 13:26 ` Jack Steiner
2006-01-20 17:31 ` Jesse Barnes
2006-01-20 19:00 ` Jack Steiner
2006-01-20 8:36 ` Ingo Molnar
2006-01-20 16:14 ` Brent Casavant
2006-01-24 0:33 ` Brent Casavant
2006-01-24 0:48 ` Luck, Tony
2006-01-24 1:23 ` Brent Casavant
2006-01-24 1:42 ` Keith Owens
2006-01-24 3:41 ` Grant Grundler
2006-01-24 6:30 ` Brent Casavant
2006-01-24 6:41 ` Brent Casavant
2006-01-24 7:04 ` Grant Grundler
2006-01-24 9:02 ` Ingo Molnar [this message]
2006-01-24 9:14 ` Jes Sorensen
2006-01-24 12:10 ` Robin Holt
2006-01-24 16:40 ` Grant Grundler
2006-01-24 16:52 ` Brent Casavant
2006-01-24 16:57 ` Brent Casavant
2006-01-24 17:00 ` Robin Holt
2006-01-24 17:33 ` Luck, Tony
2006-01-24 18:42 ` Grant Grundler
2006-01-24 21:12 ` Brent Casavant
2006-01-24 21:41 ` Ingo Molnar
2006-01-24 21:43 ` Chen, Kenneth W
2006-01-24 21:51 ` Luck, Tony
2006-01-24 22:04 ` Brent Casavant
2006-01-24 22:07 ` Chen, Kenneth W
2006-01-24 22:12 ` Brent Casavant
2006-01-24 22:19 ` Chen, Kenneth W
2006-01-24 22:31 ` Chen, Kenneth W
2006-01-24 22:41 ` Brent Casavant
2006-01-24 23:25 ` Chen, Kenneth W
2006-01-24 23:28 ` Brent Casavant
2006-01-24 23:36 ` Chen, Kenneth W
2006-01-24 23:54 ` Brent Casavant
2006-01-25 0:10 ` Brent Casavant
2006-01-25 0:29 ` Chen, Kenneth W
2006-01-25 6:27 ` Keith Owens
2006-01-25 9:04 ` Chen, Kenneth W
2006-01-25 9:24 ` Chen, Kenneth W
2006-01-25 17:04 ` Brent Casavant
2006-01-25 17:45 ` Brent Casavant
2006-01-25 17:48 ` Brent Casavant
2006-01-25 19:01 ` Chen, Kenneth W
2006-01-25 19:15 ` Brent Casavant
2006-01-25 19:43 ` Jack Steiner
2006-01-25 22:49 ` Brent Casavant
2006-01-25 23:09 ` Brent Casavant
2006-01-25 23:49 ` Brent Casavant
2006-01-25 23:56 ` Chen, Kenneth W
2006-01-26 1:06 ` Luck, Tony
2006-01-26 1:31 ` Prarit Bhargava
2006-01-26 2:43 ` Keith Owens
2006-01-26 4:40 ` Brent Casavant
2006-01-26 16:29 ` Brent Casavant
2006-01-26 16:41 ` Prarit Bhargava
2006-01-26 19:29 ` Brent Casavant
2006-01-26 19:54 ` Luck, Tony
2006-01-26 20:28 ` Brent Casavant
2006-01-26 21:05 ` Luck, Tony
2006-01-26 21:34 ` Prarit Bhargava
2006-01-26 22:11 ` Luck, Tony
2006-01-26 23:08 ` Luck, Tony
2006-01-26 23:21 ` Prarit Bhargava
2006-01-26 23:44 ` Prarit Bhargava
2006-01-27 0:07 ` Chen, Kenneth W
2006-01-27 14:01 ` Prarit Bhargava
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=20060124090235.GA673@elte.hu \
--to=mingo@elte.hu \
--cc=linux-ia64@vger.kernel.org \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox