From: Peter Zijlstra <peterz@infradead.org>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Juri Lelli <juri.lelli@arm.com>,
LKML <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Preeti U Murthy <preeti@linux.vnet.ibm.com>,
Christoph Lameter <cl@linux.com>, Ingo Molnar <mingo@kernel.org>,
Viresh Kumar <viresh.kumar@linaro.org>,
Rik van Riel <riel@redhat.com>
Subject: Re: [PATCH 07/10] sched: Migrate sched to use new tick dependency mask model
Date: Mon, 10 Aug 2015 16:28:47 +0200 [thread overview]
Message-ID: <20150810142847.GE16853@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20150810141656.GA31251@lerouge>
On Mon, Aug 10, 2015 at 04:16:58PM +0200, Frederic Weisbecker wrote:
> I considered many times relying on hrtick btw but everyone seem to say it has a lot
> of overhead, especially due to clock reprogramming on schedule() calls.
Yeah, I have some vague ideas of how to take out much of that overhead
(tglx will launch frozen sharks at me I suspect), but we cannot get
around the overhead of actually having to program the hardware and that
is still a significant amount on many machines.
Supposedly machines with TSC deadline are better, but I've not tried
to benchmark that.
next prev parent reply other threads:[~2015-08-10 14:29 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-23 16:42 [PATCH 00/10] nohz: Tick dependency mask v2 Frederic Weisbecker
2015-07-23 16:42 ` [PATCH 01/10] nohz: Remove idle task special case Frederic Weisbecker
2015-07-23 16:42 ` [PATCH 02/10] nohz: Restart nohz full tick from irq exit Frederic Weisbecker
2015-07-23 16:42 ` [PATCH 03/10] nohz: Move tick_nohz_restart_sched_tick() above its users Frederic Weisbecker
2015-07-23 16:42 ` [PATCH 04/10] nohz: Remove useless argument on tick_nohz_task_switch() Frederic Weisbecker
2015-08-03 12:39 ` Peter Zijlstra
2015-08-03 12:49 ` Frederic Weisbecker
2015-08-03 13:04 ` Peter Zijlstra
2015-07-23 16:42 ` [PATCH 05/10] nohz: New tick dependency mask Frederic Weisbecker
2015-07-24 16:55 ` Chris Metcalf
2015-07-24 17:16 ` Frederic Weisbecker
2015-07-24 17:43 ` Chris Metcalf
2015-08-03 12:48 ` Peter Zijlstra
2015-08-03 12:43 ` Peter Zijlstra
2015-08-03 13:05 ` Frederic Weisbecker
2015-08-03 13:24 ` Peter Zijlstra
2015-08-03 13:49 ` Frederic Weisbecker
2015-08-03 12:57 ` Peter Zijlstra
2015-08-03 13:09 ` Frederic Weisbecker
2015-08-03 13:29 ` Peter Zijlstra
2015-08-03 13:55 ` Frederic Weisbecker
2015-08-03 14:11 ` Peter Zijlstra
2015-07-23 16:42 ` [PATCH 06/10] perf: Migrate perf to use new tick dependency mask model Frederic Weisbecker
2015-07-23 16:42 ` [PATCH 07/10] sched: Migrate sched " Frederic Weisbecker
2015-07-23 16:55 ` Frederic Weisbecker
2015-07-24 16:56 ` Chris Metcalf
2015-07-29 13:01 ` Frederic Weisbecker
2015-08-03 14:00 ` Peter Zijlstra
2015-08-03 14:50 ` Frederic Weisbecker
2015-08-03 17:09 ` Peter Zijlstra
2015-08-03 17:30 ` Frederic Weisbecker
2015-08-04 7:41 ` Peter Zijlstra
2015-08-10 14:02 ` Juri Lelli
2015-08-10 14:16 ` Frederic Weisbecker
2015-08-10 14:28 ` Peter Zijlstra [this message]
2015-08-10 15:11 ` Peter Zijlstra
2015-08-10 15:29 ` Frederic Weisbecker
2015-08-10 15:43 ` Juri Lelli
2015-08-10 16:41 ` Peter Zijlstra
2015-08-10 15:33 ` Christoph Lameter
2015-07-23 16:42 ` [PATCH 08/10] posix-cpu-timers: Migrate " Frederic Weisbecker
2015-07-24 16:57 ` Chris Metcalf
2015-07-29 13:23 ` Frederic Weisbecker
2015-07-29 17:24 ` Chris Metcalf
2015-07-30 0:44 ` Frederic Weisbecker
2015-07-30 14:31 ` Luiz Capitulino
2015-07-30 14:46 ` Frederic Weisbecker
2015-07-30 19:35 ` Chris Metcalf
2015-07-30 19:45 ` Frederic Weisbecker
2015-07-30 19:52 ` Chris Metcalf
2015-07-31 14:49 ` Frederic Weisbecker
2015-08-03 15:59 ` Chris Metcalf
2015-08-03 18:01 ` Frederic Weisbecker
2015-08-03 17:12 ` Peter Zijlstra
2015-08-03 17:39 ` Frederic Weisbecker
2015-08-03 19:07 ` Peter Zijlstra
2015-08-06 17:13 ` Chris Metcalf
2015-07-23 16:42 ` [PATCH 09/10] sched-clock: " Frederic Weisbecker
2015-07-23 16:42 ` [PATCH 10/10] nohz: Remove task switch obsolete tick dependency check Frederic Weisbecker
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