From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [patch] ARM: smpboot: Enable interrupts after marking CPU online/active
Date: Tue, 13 Sep 2011 23:37:47 +0100 [thread overview]
Message-ID: <20110913223747.GA23109@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <alpine.LFD.2.02.1109132247490.2723@ionos>
On Tue, Sep 13, 2011 at 10:48:48PM +0200, Thomas Gleixner wrote:
> The question is whether you really need to calibrate the delay for
> each core or if you simply can take the calibration of the first
> core. That would avoid enabling interrupts all the way.
That depends whether you require all cores in a SMP system to be built
the same way or not (and therefore to have the same performance.) I'm
aware of at least one implementation where that isn't the case, and I
see no reason why that would not become more common.
In that case, we need the individual core delay calibration, and lock
delays to either cores or specific groups of cores, or use hardware
timers (if available, and with enough precision) for them.
next prev parent reply other threads:[~2011-09-13 22:37 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-08 21:57 [patch] ARM: smpboot: Enable interrupts after marking CPU online/active Thomas Gleixner
2011-09-09 4:17 ` Santosh
2011-09-13 13:30 ` amit kachhap
2011-09-13 13:32 ` Russell King - ARM Linux
2011-09-13 17:22 ` Vincent Guittot
2011-09-13 17:53 ` Russell King - ARM Linux
2011-09-13 20:48 ` Thomas Gleixner
2011-09-13 22:37 ` Russell King - ARM Linux [this message]
2011-09-14 1:10 ` Frank Rowand
2011-09-14 6:55 ` Vincent Guittot
2011-09-23 8:40 ` Russell King - ARM Linux
2011-09-26 7:26 ` Amit Kachhap
2011-09-29 7:40 ` Kukjin Kim
2011-09-29 20:12 ` Thomas Gleixner
2011-09-30 6:42 ` Kukjin Kim
2011-10-07 9:49 ` Kukjin Kim
2011-10-07 12:17 ` Thomas Gleixner
2011-10-07 14:09 ` Amit Kachhap
2011-10-10 4:28 ` Kukjin Kim
2011-10-19 21:16 ` Dima Zavin
2011-10-20 0:32 ` Dima Zavin
2011-11-15 21:54 ` Stepan Moskovchenko
2011-11-15 22:00 ` Thomas Gleixner
2011-11-15 22:00 ` Thomas Gleixner
2011-12-14 0:13 ` Dima Zavin
2011-12-14 0:13 ` Dima Zavin
2011-12-14 0:26 ` Thomas Gleixner
2011-12-14 0:26 ` Thomas Gleixner
2011-12-15 16:09 ` Peter Zijlstra
2011-12-15 16:09 ` Peter Zijlstra
2012-03-13 4:45 ` [tip:sched/core] sched: Cleanup cpu_active madness tip-bot for Peter Zijlstra
2011-11-15 23:27 ` [patch] ARM: smpboot: Enable interrupts after marking CPU online/active Dima Zavin
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