From: Davidlohr Bueso <dave@stgolabs.net>
To: Jason Low <jason.low2@hp.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Oleg Nesterov <oleg@redhat.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
linux-kernel@vger.kernel.org,
Frederic Weisbecker <fweisbec@gmail.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Steven Rostedt <rostedt@goodmis.org>,
Andrew Morton <akpm@linux-foundation.org>,
Terry Rudd <terry.rudd@hp.com>, Rik van Riel <riel@redhat.com>,
Scott J Norton <scott.norton@hp.com>
Subject: Re: [PATCH 1/3] timer: Optimize fastpath_timer_check()
Date: Mon, 31 Aug 2015 08:15:05 -0700 [thread overview]
Message-ID: <1441034105.1831.39.camel@stgolabs.net> (raw)
In-Reply-To: <1440559068-29680-2-git-send-email-jason.low2@hp.com>
On Tue, 2015-08-25 at 20:17 -0700, Jason Low wrote:
> In fastpath_timer_check(), the task_cputime() function is always
> called to compute the utime and stime values. However, this is not
> necessary if there are no per-thread timers to check for. This patch
> modifies the code such that we compute the task_cputime values only
> when there are per-thread timers set.
>
> Signed-off-by: Jason Low <jason.low2@hp.com>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
next prev parent reply other threads:[~2015-08-31 15:15 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-26 3:17 [PATCH 0/3] timer: Improve itimers scalability Jason Low
2015-08-26 3:17 ` [PATCH 1/3] timer: Optimize fastpath_timer_check() Jason Low
2015-08-26 21:57 ` Frederic Weisbecker
2015-08-31 15:15 ` Davidlohr Bueso [this message]
2015-08-31 19:40 ` Jason Low
2015-08-26 3:17 ` [PATCH 2/3] timer: Check thread timers only when there are active thread timers Jason Low
2015-08-26 3:17 ` [PATCH 3/3] timer: Reduce unnecessary sighand lock contention Jason Low
2015-08-26 17:53 ` Linus Torvalds
2015-08-26 22:31 ` Frederic Weisbecker
2015-08-26 22:57 ` Jason Low
2015-08-26 22:56 ` Frederic Weisbecker
2015-08-26 23:32 ` Jason Low
2015-08-27 4:52 ` Jason Low
2015-08-27 12:53 ` Frederic Weisbecker
2015-08-27 20:29 ` Jason Low
2015-08-27 21:12 ` Frederic Weisbecker
2015-08-26 3:27 ` [PATCH 0/3] timer: Improve itimers scalability Andrew Morton
2015-08-26 16:33 ` Jason Low
2015-08-26 17:08 ` Oleg Nesterov
2015-08-26 22:07 ` Jason Low
2015-08-26 22:53 ` Hideaki Kimura
2015-08-26 23:13 ` Frederic Weisbecker
2015-08-26 23:45 ` Hideaki Kimura
2015-08-27 13:18 ` Frederic Weisbecker
2015-08-27 14:47 ` Steven Rostedt
2015-08-27 15:09 ` Thomas Gleixner
2015-08-27 15:17 ` Frederic Weisbecker
2015-08-26 16:57 [PATCH 1/3] timer: Optimize fastpath_timer_check() George Spelvin
2015-08-26 17:31 ` Jason Low
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