From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: linux-kernel@vger.kernel.org, mingo@kernel.org,
laijs@cn.fujitsu.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
josh@joshtriplett.org, niv@us.ibm.com, tglx@linutronix.de,
peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com,
edumazet@google.com, darren@dvhart.com, fweisbec@gmail.com,
sbw@mit.edu
Subject: Re: [PATCH tip/core/timers 4/4] timers: Reduce future __run_timers() latency for first add to empty list
Date: Wed, 15 Jan 2014 18:33:28 -0800 [thread overview]
Message-ID: <20140116023328.GS10038@linux.vnet.ibm.com> (raw)
In-Reply-To: <20140115172409.GD11499@redhat.com>
On Wed, Jan 15, 2014 at 06:24:09PM +0100, Oleg Nesterov wrote:
> On 01/14, Paul E. McKenney wrote:
> >
> > @@ -749,6 +749,7 @@ __mod_timer(struct timer_list *timer, unsigned long expires,
> >
> > base = lock_timer_base(timer, &flags);
> >
> > + (void)catchup_timer_jiffies(base);
>
> Agreed, but perhaps it would be better to do this before
> all_timers++ in internal_add_timer() ?
Excellent point, changed.
> This is funny, but I already have the same change for ->next_timer,
> if we add this optimization perhaps that trivial patch makes sense
> too.
Yep, I queued your change in my series as well, thank you!
Thanx, Paul
next prev parent reply other threads:[~2014-01-16 2:33 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-15 5:19 [PATCH v2 tip/core/timers] Crude timer-wheel latency hacks Paul E. McKenney
2014-01-15 5:20 ` [PATCH tip/core/timers 1/4] timers: Track total number of timers in list Paul E. McKenney
2014-01-15 5:20 ` [PATCH tip/core/timers 2/4] timers: Reduce __run_timers() latency for empty list Paul E. McKenney
2014-01-15 17:03 ` Oleg Nesterov
2014-01-15 17:10 ` Peter Zijlstra
2014-01-16 2:14 ` Paul E. McKenney
2014-01-15 17:38 ` Oleg Nesterov
2014-01-15 20:32 ` Josh Triplett
2014-01-15 20:47 ` Steven Rostedt
2014-01-16 2:22 ` Paul E. McKenney
2014-01-15 20:33 ` Josh Triplett
2014-01-16 2:23 ` Paul E. McKenney
2014-01-15 5:20 ` [PATCH tip/core/timers 3/4] timers: Reduce future __run_timers() latency for newly emptied list Paul E. McKenney
2014-01-15 17:08 ` Oleg Nesterov
2014-01-16 2:23 ` Paul E. McKenney
2014-01-15 20:54 ` Steven Rostedt
2014-01-15 23:41 ` Paul E. McKenney
2014-01-15 5:20 ` [PATCH tip/core/timers 4/4] timers: Reduce future __run_timers() latency for first add to empty list Paul E. McKenney
2014-01-15 17:24 ` Oleg Nesterov
2014-01-15 17:31 ` [PATCH 0/1] timers: internal_add_timer() should update ->next_timer if ->active_timers == 0 Oleg Nesterov
2014-01-15 17:31 ` [PATCH 1/1] " Oleg Nesterov
2014-01-15 20:56 ` Steven Rostedt
2014-01-16 2:10 ` Paul E. McKenney
2014-01-16 2:33 ` Paul E. McKenney [this message]
2014-01-15 22:22 ` [PATCH v2 tip/core/timers] Crude timer-wheel latency hacks Thomas Gleixner
2014-01-16 2:36 ` Paul E. McKenney
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20140116023328.GS10038@linux.vnet.ibm.com \
--to=paulmck@linux.vnet.ibm.com \
--cc=akpm@linux-foundation.org \
--cc=darren@dvhart.com \
--cc=dhowells@redhat.com \
--cc=dipankar@in.ibm.com \
--cc=edumazet@google.com \
--cc=fweisbec@gmail.com \
--cc=josh@joshtriplett.org \
--cc=laijs@cn.fujitsu.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mathieu.desnoyers@efficios.com \
--cc=mingo@kernel.org \
--cc=niv@us.ibm.com \
--cc=oleg@redhat.com \
--cc=peterz@infradead.org \
--cc=rostedt@goodmis.org \
--cc=sbw@mit.edu \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox