From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Rik van Riel <riel@redhat.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Avi Kiviti <avi@redhat.com>,
Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>,
Mike Galbraith <efault@gmx.de>,
Chris Wright <chrisw@sous-sol.org>,
ttracy@redhat.com, dshaks@redhat.com
Subject: Re: [RFC -v5 PATCH 2/4] sched: Add yield_to(task, preempt) functionality.
Date: Fri, 14 Jan 2011 18:15:43 +0100 [thread overview]
Message-ID: <1295025343.2274.5.camel@twins> (raw)
In-Reply-To: <20110114030357.03c3060a@annuminas.surriel.com>
On Fri, 2011-01-14 at 03:03 -0500, Rik van Riel wrote:
> From: Mike Galbraith <efault@gmx.de>
>
> Currently only implemented for fair class tasks.
>
> Add a yield_to_task method() to the fair scheduling class. allowing the
> caller of yield_to() to accelerate another thread in it's thread group,
> task group.
>
> Implemented via a scheduler hint, using cfs_rq->next to encourage the
> target being selected. We can rely on pick_next_entity to keep things
> fair, so noone can accelerate a thread that has already used its fair
> share of CPU time.
>
> This also means callers should only call yield_to when they really
> mean it. Calling it too often can result in the scheduler just
> ignoring the hint.
>
> Signed-off-by: Rik van Riel <riel@redhat.com>
> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
> Signed-off-by: Mike Galbraith <efault@gmx.de>
Looks good to me, do you want me to merge this or will you merge it
through the kvm tree with all other patches?
next prev parent reply other threads:[~2011-01-14 17:16 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-14 8:02 [RFC -v5 PATCH 0/4] directed yield for Pause Loop Exiting Rik van Riel
2011-01-14 8:03 ` [RFC -v5 PATCH 1/4] kvm: keep track of which task is running a KVM vcpu Rik van Riel
2011-01-16 15:17 ` Avi Kivity
2011-01-14 8:03 ` [RFC -v5 PATCH 2/4] sched: Add yield_to(task, preempt) functionality Rik van Riel
2011-01-14 17:15 ` Peter Zijlstra [this message]
2011-01-14 17:47 ` Srivatsa Vaddagiri
2011-01-14 18:29 ` Rik van Riel
2011-01-17 15:53 ` Srivatsa Vaddagiri
2011-01-14 8:04 ` [RFC -v5 PATCH 3/4] export pid symbols needed for kvm_vcpu_on_spin Rik van Riel
2011-01-16 15:18 ` Avi Kivity
2011-01-14 8:05 ` [RFC -v5 PATCH 4/4] kvm: use yield_to instead of sleep in kvm_vcpu_on_spin Rik van Riel
2011-01-14 17:34 ` [RFC -v5 PATCH 0/4] directed yield for Pause Loop Exiting Rik van Riel
2011-01-14 21:29 ` Rik van Riel
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=1295025343.2274.5.camel@twins \
--to=a.p.zijlstra@chello.nl \
--cc=avi@redhat.com \
--cc=chrisw@sous-sol.org \
--cc=dshaks@redhat.com \
--cc=efault@gmx.de \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=riel@redhat.com \
--cc=ttracy@redhat.com \
--cc=vatsa@linux.vnet.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.