From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Eric Dumazet <edumazet@google.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Chris Mason <clm@fb.com>, Arjan van de Ven <arjan@infradead.org>,
rt@linutronix.de, Rik van Riel <riel@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
George Spelvin <linux@sciencehorizons.net>,
Len Brown <lenb@kernel.org>,
Josh Triplett <josh@joshtriplett.org>
Subject: Re: [patch V3 00/22] timer: Refactor the timer wheel
Date: Mon, 27 Jun 2016 16:56:16 -0700 [thread overview]
Message-ID: <20160627235616.GA18544@linux.vnet.ibm.com> (raw)
In-Reply-To: <20160627042236.GC4309@linux.vnet.ibm.com>
On Sun, Jun 26, 2016 at 09:22:36PM -0700, Paul E. McKenney wrote:
> On Fri, Jun 24, 2016 at 02:32:00PM -0000, Thomas Gleixner wrote:
> > This is the third version of the timer wheel rework series. The previous
> > versions can be found here:
> >
> > V1: http://lkml.kernel.org/r/20160613070440.950649741@linutronix.de
> > V2: http://lkml.kernel.org/r/20160617121134.417319325@linutronix.de
> >
> > The series is also available in git:
> >
> > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.timers
> >
> > Changes vs. V2:
> >
> > - Removed the 1000Hz granularity reduction to 4ms. Eric explained that
> > datacenter workloads require the granularity in the first level wheel.
> >
> > - Fixed the typo in tilepro.
> >
> > - Converted sigtimedwait() to hrtimers
> >
> > - To avoid the cascading I extended the wheel by another level. This removes
> > the rarely executed cascading code path, but increases the storage size for
> > HZ>100 slightly. If the tiny folks care, there is an simple option to cut
> > the storage size in half for the price of reduced granularity.
> >
> > Thanks,
>
> And this series avoids the strange SRCU behavior that I saw with the
> last version. So looks to be getting there!
>
> I will be torturing it more vigorously, but looking good so far.
And from RCU and rcutorture perspectives:
Tested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Thanx, Paul
> > tglx
> >
> > ----
> > arch/x86/kernel/apic/x2apic_uv_x.c | 4
> > arch/x86/kernel/cpu/mcheck/mce.c | 4
> > block/genhd.c | 5
> > drivers/cpufreq/powernv-cpufreq.c | 5
> > drivers/mmc/host/jz4740_mmc.c | 2
> > drivers/net/ethernet/tile/tilepro.c | 4
> > drivers/power/bq27xxx_battery.c | 5
> > drivers/tty/metag_da.c | 4
> > drivers/tty/mips_ejtag_fdc.c | 4
> > drivers/usb/host/ohci-hcd.c | 1
> > drivers/usb/host/xhci.c | 2
> > include/linux/list.h | 10
> > include/linux/timer.h | 34 -
> > kernel/signal.c | 24
> > kernel/time/tick-internal.h | 1
> > kernel/time/tick-sched.c | 46 -
> > kernel/time/timer.c | 1096 +++++++++++++++++++++---------------
> > lib/random32.c | 1
> > net/ipv4/inet_connection_sock.c | 7
> > net/ipv4/inet_timewait_sock.c | 5
> > 20 files changed, 734 insertions(+), 530 deletions(-)
> >
> >
prev parent reply other threads:[~2016-06-27 23:56 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-24 14:32 [patch V3 00/22] timer: Refactor the timer wheel Thomas Gleixner
2016-06-24 14:32 ` [patch V3 01/22] timer: Make pinned a timer property Thomas Gleixner
2016-07-01 13:03 ` Frederic Weisbecker
2016-06-24 14:32 ` [patch V3 02/22] x86/apic/uv: Initialize timer as pinned Thomas Gleixner
2016-06-24 14:32 ` [patch V3 03/22] x86/mce: " Thomas Gleixner
2016-06-24 14:32 ` [patch V3 04/22] cpufreq/powernv: " Thomas Gleixner
2016-06-24 14:32 ` [patch V3 05/22] driver/net/ethernet/tile: " Thomas Gleixner
2016-06-24 14:32 ` [patch V3 06/22] drivers/tty/metag_da: " Thomas Gleixner
2016-06-24 14:32 ` [patch V3 07/22] drivers/tty/mips_ejtag: " Thomas Gleixner
2016-06-24 14:32 ` [patch V3 08/22] net/ipv4/inet: Initialize timers " Thomas Gleixner
2016-06-24 14:32 ` [patch V3 09/22] timer: Remove mod_timer_pinned Thomas Gleixner
2016-06-24 14:32 ` [patch V3 10/22] signal: Use hrtimer for sigtimedwait Thomas Gleixner
2016-06-24 14:32 ` [patch V3 11/22] hlist: Add hlist_is_singular_node() helper Thomas Gleixner
2016-06-24 14:32 ` [patch V3 12/22] timer: Give a few structs and members proper names Thomas Gleixner
2016-06-24 14:32 ` [patch V3 13/22] timer: Reduce the CPU index space to 256k Thomas Gleixner
2016-07-01 14:41 ` Frederic Weisbecker
2016-06-24 14:32 ` [patch V3 14/22] timer: Switch to a non cascading wheel Thomas Gleixner
2016-06-24 14:32 ` [patch V3 15/22] timer: Remove slack leftovers Thomas Gleixner
2016-06-24 14:32 ` [patch V3 16/22] timer: Move __run_timers() function Thomas Gleixner
2016-06-24 14:32 ` [patch V3 17/22] timer: Optimize collect timers for NOHZ Thomas Gleixner
2016-06-24 14:32 ` [patch V3 18/22] tick/sched: Remove pointless empty function Thomas Gleixner
2016-06-24 14:32 ` [patch V3 19/22] timer: Forward wheel clock whenever possible Thomas Gleixner
2016-06-24 20:45 ` Richard Cochran
2016-06-25 8:55 ` Thomas Gleixner
2016-06-24 14:32 ` [patch V3 20/22] timer: Only wake softirq if necessary Thomas Gleixner
2016-06-24 14:32 ` [patch V3 21/22] timer: Split out index calculation Thomas Gleixner
2016-06-24 14:32 ` [patch V3 22/22] timer: Optimization for same expiry time in mod_timer() Thomas Gleixner
2016-06-24 17:04 ` [patch V3 00/22] timer: Refactor the timer wheel Josh Triplett
2016-06-27 4:22 ` Paul E. McKenney
2016-06-27 23:56 ` Paul E. McKenney [this message]
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