From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Shawn Guo <shawn.guo@linaro.org>
Cc: Stanislav Meduna <stano@meduna.org>,
"linux-rt-users@vger.kernel.org" <linux-rt-users@vger.kernel.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: scheduler clock for MXS
Date: Tue, 6 Nov 2012 20:20:38 +0000 [thread overview]
Message-ID: <20121106202038.GB32398@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20121106134630.GD27643@S2100-06.ap.freescale.net>
On Tue, Nov 06, 2012 at 09:46:31PM +0800, Shawn Guo wrote:
> On Tue, Nov 06, 2012 at 09:34:39AM +0100, Stanislav Meduna wrote:
> > Shawn: could you try change the
> > update_sched_clock();
> > to
> > sched_clock_poll(sched_clock_timer.data);
> > right after update_sched_clock call in setup_sched_clock?
> >
> With the change, it still wraps at 2 seconds.
And there's no way that such a change could ever go into mainline; it
can mean that the timer is registered into the timer subsystem before
the timer subsystem has been initialised. That's why we postpone that
part to time_init().
(And it has _always_ been intended that this sched_clock() implementation
would be usable by the time setup_arch() completes...)
next prev parent reply other threads:[~2012-11-06 20:20 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-31 21:41 Wakeup latency measured with SCHED_TRACER depends on HZ Stanislav Meduna
2012-11-02 14:29 ` Stanislav Meduna
2012-11-05 2:57 ` Shawn Guo
2012-11-05 9:14 ` scheduler clock for MXS [Was: Re: Wakeup latency measured with SCHED_TRACER depends on HZ] Stanislav Meduna
2012-11-05 13:46 ` Shawn Guo
2012-11-05 16:09 ` Stanislav Meduna
2012-11-05 22:28 ` Russell King - ARM Linux
2012-11-06 2:40 ` Shawn Guo
2012-11-06 10:12 ` Russell King - ARM Linux
2012-11-06 13:49 ` Shawn Guo
2012-11-06 20:04 ` Russell King - ARM Linux
2012-11-06 8:34 ` scheduler clock for MXS Stanislav Meduna
2012-11-06 9:45 ` Russell King - ARM Linux
2012-11-06 13:46 ` Shawn Guo
2012-11-06 20:20 ` Russell King - ARM Linux [this message]
2012-11-06 22:30 ` Stanislav Meduna
2012-11-06 22:46 ` Russell King - ARM Linux
2012-11-07 7:13 ` Shawn Guo
2012-11-08 21:27 ` Stanislav Meduna
2012-11-08 22:11 ` Russell King - ARM Linux
2012-11-08 22:45 ` [PATCH] ARM: mxs: Setup scheduler clock Stanislav Meduna
2012-11-12 1:54 ` Shawn Guo
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