From: Rik van Riel <riel@redhat.com>
To: Venkatesh Pallipadi <venki@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org, Paul Turner <pjt@google.com>,
Mike Galbraith <efault@gmx.de>
Subject: Re: [PATCH] sched: next buddy hint on sleep and preempt path
Date: Tue, 01 Mar 2011 21:44:09 -0500 [thread overview]
Message-ID: <4D6DAEF9.6000806@redhat.com> (raw)
In-Reply-To: <1299022433-17233-1-git-send-email-venki@google.com>
On 03/01/2011 06:33 PM, Venkatesh Pallipadi wrote:
> When a task in a taskgroup sleeps, pick_next_task starts all the way back at
> the root and picks the task/taskgroup with the min vruntime across all
> runnable tasks. But, when there are many frequently sleeping tasks
> across different taskgroups, it makes better sense to stay with same taskgroup
> for its slice period (or until all tasks in the taskgroup sleeps) instead of
> switching cross taskgroup on each sleep after a short runtime.
> This helps specifically where taskgroups corresponds to a process with
> multiple threads. The change reduces the number of CR3 switches in this case.
Nice!
> Signed-off-by: Venkatesh Pallipadi<venki@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
--
All rights reversed
next prev parent reply other threads:[~2011-03-02 2:44 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-01 23:33 [PATCH] sched: next buddy hint on sleep and preempt path Venkatesh Pallipadi
2011-03-02 2:44 ` Rik van Riel [this message]
2011-03-02 5:43 ` Paul Turner
2011-03-02 6:47 ` Mike Galbraith
2011-03-02 7:08 ` Paul Turner
2011-03-02 7:40 ` Mike Galbraith
2011-03-02 19:12 ` Venkatesh Pallipadi
2011-03-08 0:59 ` [PATCH] sched: next buddy hint on sleep and preempt path - v1 Venkatesh Pallipadi
2011-03-08 1:29 ` Paul Turner
2011-03-08 1:47 ` Venkatesh Pallipadi
2011-04-14 1:21 ` [PATCH 0/2] sched: Avoid frequent cross taskgroup switches -v2 Venkatesh Pallipadi
2011-04-14 1:21 ` [PATCH 1/2] sched: Make set_*_buddy work on non-task entity -v2 Venkatesh Pallipadi
2011-04-19 12:05 ` [tip:sched/core] sched: Make set_*_buddy() work on non-task entities tip-bot for Venkatesh Pallipadi
2011-04-14 1:21 ` [PATCH 2/2] sched: next buddy hint on sleep and preempt path -v2 Venkatesh Pallipadi
2011-04-14 10:50 ` Peter Zijlstra
2011-04-14 17:30 ` Venkatesh Pallipadi
2011-04-15 21:45 ` Rik van Riel
2011-04-19 12:05 ` [tip:sched/core] sched: Next buddy hint on sleep and preempt path tip-bot for Venkatesh Pallipadi
2011-03-08 2:33 ` [PATCH] sched: next buddy hint on sleep and preempt path - v1 Venkatesh Pallipadi
2011-03-02 19:22 ` [PATCH] sched: next buddy hint on sleep and preempt path Venkatesh Pallipadi
2011-03-02 10:31 ` Peter Zijlstra
2011-03-02 15:25 ` Mike Galbraith
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