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From: Peter Zijlstra <peterz@infradead.org>
To: Eliezer Tamir <eliezer.tamir@linux.intel.com>
Cc: John Stultz <john.stultz@linaro.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Steven Rostedt <rostedt@goodmis.org>, Ingo Molnar <mingo@elte.hu>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Andy Lutomirski <luto@amacapital.net>,
	linux-kernel@vger.kernel.org, Tony Luck <tony.luck@gmail.com>,
	hpa@zytor.com, Peter Zijlstra <peterz@infradead.org>
Subject: [RFC][PATCH 0/7] sched: Optimize sched_clock bits
Date: Fri, 29 Nov 2013 18:36:57 +0100	[thread overview]
Message-ID: <20131129173657.252094369@infradead.org> (raw)

Hi all,

This series is supposed to optimize the kernel/sched/clock.c and x86
sched_clock() implementations.

So far its only been boot tested. So no clue if it really makes the thing
faster, but it does remove the need to disable IRQs.

I'm hoping Eliezer will test this with his benchmark where he could measure a
performance regression between using sched_clock() and local_clock().

It looks like ia64, the only other CONFIG_HAVE_UNSTABLE_SCHED_CLOCK user,
already matches the new expectations -- mostly not requiring IRQs disabled for
calling sched_clock().


             reply	other threads:[~2013-11-29 17:48 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-11-29 17:36 Peter Zijlstra [this message]
2013-11-29 17:36 ` [RFC][PATCH 1/7] math64: mul_u64_u32_shr() Peter Zijlstra
2013-11-29 17:36 ` [RFC][PATCH 2/7] x86: Use mul_u64_u32_shr() for native_sched_clock() Peter Zijlstra
2013-11-29 17:37 ` [RFC][PATCH 3/7] x86: Avoid a runtime condition in native_sched_clock() Peter Zijlstra
2013-11-29 17:37 ` [RFC][PATCH 4/7] x86: Move some code around Peter Zijlstra
2013-11-29 17:37 ` [RFC][PATCH 5/7] x86: Use latch data structure for cyc2ns Peter Zijlstra
2013-11-29 23:22   ` Andy Lutomirski
2013-11-30  9:18     ` Peter Zijlstra
2013-11-29 17:37 ` [RFC][PATCH 6/7] sched: Remove local_irq_disable() from the clocks Peter Zijlstra
2013-11-29 17:37 ` [RFC][PATCH 7/7] sched: Use a static_key for sched_clock_stable Peter Zijlstra
2013-12-01 18:08 ` [RFC][PATCH 0/7] sched: Optimize sched_clock bits Eliezer Tamir
2013-12-03 15:10   ` Peter Zijlstra
2013-12-10 14:47     ` Peter Zijlstra

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