From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Venkatesh Pallipadi <venki@google.com>
Cc: Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Anton Blanchard <anton@au1.ibm.com>,
Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>,
Suresh Siddha <suresh.b.siddha@intel.com>,
Paul Turner <pjt@google.com>, Mike Galbraith <efault@gmx.de>,
Thomas Gleixner <tglx@linutronix.de>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Andreas Herrmann <andreas.herrmann3@amd.com>
Subject: Re: [RFC][PATCH 09/14] sched: Dynamically allocate sched_domain/sched_group data-structures
Date: Fri, 25 Mar 2011 22:06:23 +0100 [thread overview]
Message-ID: <1301087183.2250.306.camel@laptop> (raw)
In-Reply-To: <AANLkTikUGwkOwUoGcti0SOFWVKxAMZNUk9c30oBRFmMx@mail.gmail.com>
On Fri, 2011-03-18 at 18:23 -0700, Venkatesh Pallipadi wrote:
> > if (affine_sd) {
> > - if (cpu == prev_cpu || wake_affine(affine_sd, p, sync))
> > - return select_idle_sibling(p, cpu);
> > - else
> > - return select_idle_sibling(p, prev_cpu);
> > + if (wake_affine(affine_sd, p, sync))
> > + prev_cpu = cpu;
> > +
> > + new_cpu = select_idle_sibling(p, prev_cpu);
> > + goto unlock;
> > }
> >
> > while (sd) {
>
> This would result in going through wake_affine() doing all
> effective_load stuff even with cpu == prev_cpu. No?
> So, we need either if (cpu != prev_cpu && wake_affine(affine_sd, p,
> sync)) or an check at the start to have want_affine=0 for this case.
D'0h yeah, I missed the conditional execution of wake_affine there, silly me.
next prev parent reply other threads:[~2011-03-25 21:04 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-14 15:06 [RFC][PATCH 00/14] Rewrite sched_domain/sched_group creation Peter Zijlstra
2011-03-14 15:06 ` [RFC][PATCH 01/14] sched: Remove obsolete arch_ prefixes Peter Zijlstra
2011-03-14 15:06 ` [RFC][PATCH 02/14] sched: Simplify cpu_power initialization Peter Zijlstra
2011-03-14 21:35 ` Steven Rostedt
2011-03-14 21:46 ` Peter Zijlstra
2011-03-14 15:06 ` [RFC][PATCH 03/14] sched: Simplify build_sched_groups Peter Zijlstra
2011-03-14 15:06 ` [RFC][PATCH 04/14] sched: Change NODE sched_domain group creation Peter Zijlstra
2011-03-14 15:06 ` [RFC][PATCH 05/14] sched: Clean up some ALLNODES code Peter Zijlstra
2011-03-14 15:06 ` [RFC][PATCH 06/14] Simplify group creation Peter Zijlstra
2011-03-14 15:06 ` [RFC][PATCH 07/14] sched: Simplify finding the lowest sched_domain Peter Zijlstra
2011-03-14 15:06 ` [RFC][PATCH 08/14] sched: Simplify sched_groups_power initialization Peter Zijlstra
2011-03-14 15:06 ` [RFC][PATCH 09/14] sched: Dynamically allocate sched_domain/sched_group data-structures Peter Zijlstra
2011-03-18 9:08 ` Bharata B Rao
2011-03-18 9:37 ` Peter Zijlstra
2011-03-19 1:23 ` Venkatesh Pallipadi
2011-03-25 21:06 ` Peter Zijlstra [this message]
2011-03-14 15:06 ` [RFC][PATCH 10/14] sched: Simplify the free path some Peter Zijlstra
2011-03-14 15:06 ` [RFC][PATCH 11/14] sched: Reduce some allocation pressure Peter Zijlstra
2011-03-14 15:06 ` [RFC][PATCH 12/14] sched: Simplify NODE/ALLNODES domain creation Peter Zijlstra
2011-03-14 15:06 ` [RFC][PATCH 13/14] sched: Remove nodemask allocation Peter Zijlstra
2011-03-14 15:06 ` [RFC][PATCH 14/14] sched: Remove some dead code Peter Zijlstra
2011-03-25 21:46 ` [RFC][PATCH 00/14] Rewrite sched_domain/sched_group creation Peter Zijlstra
2011-03-25 21:53 ` Peter Zijlstra
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=1301087183.2250.306.camel@laptop \
--to=a.p.zijlstra@chello.nl \
--cc=andreas.herrmann3@amd.com \
--cc=anton@au1.ibm.com \
--cc=benh@kernel.crashing.org \
--cc=efault@gmx.de \
--cc=heiko.carstens@de.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=pjt@google.com \
--cc=suresh.b.siddha@intel.com \
--cc=tglx@linutronix.de \
--cc=vatsa@linux.vnet.ibm.com \
--cc=venki@google.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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox