From: Thomas Gleixner <tglx@linutronix.de>
To: Sam Ravnborg <sam@ravnborg.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
Sebastian Siewior <bigeasy@linutronix.de>,
Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [patch 00/10] cpu/hotplug: Final cleanup
Date: Tue, 27 Dec 2016 12:17:54 +0100 (CET) [thread overview]
Message-ID: <alpine.DEB.2.20.1612271211490.3687@nanos> (raw)
In-Reply-To: <20161222175923.GB17658@ravnborg.org>
On Thu, 22 Dec 2016, Sam Ravnborg wrote:
> Hi Thomas.
>
> On Wed, Dec 21, 2016 at 08:19:47PM +0100, Thomas Gleixner wrote:
> > The following series completes the cpuhotplug rework stage ONE.
>
> Just curious - what is the stage TWO (and onwards) plan?
> lwn had some coverage of this work but I assume the
> article is somewhat outdated.
Stage 2 is to consolidate all the archictecture code, i.e. reduce it to
really arch specific callbacks and keep all the other things
(synchronization, state settings etc.) in the core code.
After that we can do smart things like speed up the boot hotplug process:
prepare CPU1
kick CPU1
prepare CPU2
kick CPU2
....
prepare CPUN
kick CPUN
check CPU1 alive
bringup CPU1
...
check CPUN alive
bringup CPUN
That saves ~200ms per CPU on x86, which we now spend busy waiting for the
CPU to come alive.
There is more stuff which we can do in the long run like synchrounosly
letting CPUs bring up themself after the basic init/sync checks, but that
needs lot of surgery all over the place.
Thanks,
tglx
next prev parent reply other threads:[~2016-12-27 11:21 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-21 19:19 Thomas Gleixner
2016-12-21 19:19 ` [patch 01/10] ARM: imx: mmcd: Fix broken cpu hotplug handling Thomas Gleixner
2016-12-22 20:18 ` [tip:smp/urgent] ARM/imx/mmcd: " tip-bot for Thomas Gleixner
2016-12-25 10:02 ` tip-bot for Thomas Gleixner
2016-12-21 19:19 ` [patch 02/10] cpu/hotplug: Prevent overwriting of callbacks Thomas Gleixner
2016-12-22 11:07 ` Thomas Gleixner
2016-12-26 23:04 ` ojab
2016-12-26 23:12 ` ojab
2016-12-22 20:21 ` [tip:smp/urgent] " tip-bot for Thomas Gleixner
2016-12-25 10:04 ` tip-bot for Thomas Gleixner
2016-12-21 19:19 ` [patch 03/10] scsi/bnx2fc: Convert to hotplug state machine Thomas Gleixner
2016-12-22 20:21 ` [tip:smp/urgent] " tip-bot for Sebastian Andrzej Siewior
2016-12-25 10:05 ` tip-bot for Sebastian Andrzej Siewior
2016-12-21 19:19 ` [patch 04/10] scsi/bnx2i: " Thomas Gleixner
2016-12-22 20:22 ` [tip:smp/urgent] " tip-bot for Sebastian Andrzej Siewior
2016-12-25 10:05 ` tip-bot for Sebastian Andrzej Siewior
2016-12-21 19:19 ` [patch 05/10] staging/lustre/libcfs: " Thomas Gleixner
2016-12-22 20:22 ` [tip:smp/urgent] " tip-bot for Anna-Maria Gleixner
2016-12-25 10:06 ` tip-bot for Anna-Maria Gleixner
2016-12-21 19:19 ` [patch 06/10] cpu/hotplug: Remove obsolete cpu hotplug register/unregister functions Thomas Gleixner
2016-12-22 20:23 ` [tip:smp/urgent] " tip-bot for Thomas Gleixner
2016-12-25 10:06 ` tip-bot for Thomas Gleixner
2016-12-21 19:19 ` [patch 07/10] cpu/hotplug: Cleanup state names Thomas Gleixner
2016-12-22 20:23 ` [tip:smp/urgent] " tip-bot for Thomas Gleixner
2016-12-25 10:07 ` tip-bot for Thomas Gleixner
2016-12-21 19:19 ` [patch 08/10] coresight: etm3/4x: Consolidate hotplug state space Thomas Gleixner
2016-12-22 16:30 ` Mathieu Poirier
2016-12-22 20:24 ` [tip:smp/urgent] coresight/etm3/4x: " tip-bot for Thomas Gleixner
2016-12-25 10:07 ` tip-bot for Thomas Gleixner
2016-12-21 19:19 ` [patch 09/10] irqchip/gic: " Thomas Gleixner
2016-12-22 20:24 ` [tip:smp/urgent] " tip-bot for Thomas Gleixner
2016-12-25 10:08 ` tip-bot for Thomas Gleixner
2016-12-21 19:19 ` [patch 10/10] irqchip/armada-xp: " Thomas Gleixner
2016-12-21 20:22 ` Thomas Petazzoni
2016-12-21 20:27 ` Thomas Gleixner
2016-12-22 20:25 ` [tip:smp/urgent] " tip-bot for Thomas Gleixner
2016-12-25 10:08 ` tip-bot for Thomas Gleixner
2016-12-22 17:59 ` [patch 00/10] cpu/hotplug: Final cleanup Sam Ravnborg
2016-12-27 11:17 ` Thomas Gleixner [this message]
2016-12-27 19:41 ` Sam Ravnborg
-- strict thread matches above, loose matches on Subject: below --
2016-11-26 23:13 cpu hotplug: convert more drivers (batch #6 and last) Sebastian Andrzej Siewior
2016-11-26 23:13 ` [PATCH 01/22] cpufreq/acpi-cpufreq: Convert to hotplug state machine Sebastian Andrzej Siewior
2016-11-28 5:15 ` Viresh Kumar
2016-11-28 9:49 ` Sebastian Andrzej Siewior
2016-11-28 9:51 ` [PATCH 01/22 v2] " Sebastian Andrzej Siewior
2016-11-28 9:54 ` Viresh Kumar
2016-11-28 12:46 ` Rafael J. Wysocki
2016-11-26 23:13 ` [PATCH 02/22] cpufreq/acpi-cpufreq: drop rdmsr_on_cpus() usage Sebastian Andrzej Siewior
2016-11-28 9:52 ` [PATCH 02/22 v2] " Sebastian Andrzej Siewior
2016-11-28 9:54 ` Viresh Kumar
2016-11-26 23:13 ` [PATCH 03/22] idle/intel: Remove superfluous SMP fuction call Sebastian Andrzej Siewior
2016-11-26 23:13 ` [PATCH 04/22] idle/intel: Convert to hotplug state machine Sebastian Andrzej Siewior
2016-11-28 17:29 ` Thomas Gleixner
2016-11-29 9:40 ` Sebastian Andrzej Siewior
2016-11-29 9:51 ` [PATCH 04/22 v2] " Sebastian Andrzej Siewior
2016-11-26 23:13 ` [PATCH 05/22] oprofile/nmi timer: " Sebastian Andrzej Siewior
2016-12-02 0:09 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-26 23:13 ` [PATCH 06/22] tracing/rb: " Sebastian Andrzej Siewior
2016-12-02 0:10 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-12-07 11:15 ` [linux-next] tracing/rb: NULL pointer dereference at trace_rb_cpu_prepare() Tetsuo Handa
2016-12-07 13:31 ` [PATCH] tracing/rb: init the CPU mask on allocation Sebastian Andrzej Siewior
2016-12-07 13:43 ` [tip:smp/hotplug] tracing/rb: Init " tip-bot for Sebastian Andrzej Siewior
2016-12-07 14:33 ` [PATCH] tracing/rb: init " Tetsuo Handa
2016-11-26 23:13 ` [PATCH 07/22] mm/vmstat: Drop get_online_cpus() from init_cpu_node_state/vmstat_cpu_dead() Sebastian Andrzej Siewior
2016-11-28 9:24 ` Michal Hocko
2016-12-02 0:10 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-26 23:13 ` [PATCH 08/22] mm/vmstat: Avoid on each online CPU loops Sebastian Andrzej Siewior
2016-11-28 9:28 ` Michal Hocko
2016-11-29 14:08 ` Thomas Gleixner
2016-11-29 14:44 ` Michal Hocko
2016-11-29 14:51 ` [PATCH 08/22 v2] " Sebastian Andrzej Siewior
2016-11-29 15:20 ` Michal Hocko
2016-12-02 0:11 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-26 23:13 ` [PATCH 09/22] mm/vmstat: Convert to hotplug state machine Sebastian Andrzej Siewior
2016-11-29 14:52 ` [PATCH 09/22 v2] " Sebastian Andrzej Siewior
2016-12-02 0:11 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-26 23:13 ` [PATCH 10/22] mm/zsmalloc: " Sebastian Andrzej Siewior
2016-12-02 0:12 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-26 23:13 ` [PATCH 11/22] mm/zswap: Convert dst-mem " Sebastian Andrzej Siewior
2016-12-02 0:12 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-26 23:13 ` [PATCH 12/22] mm/zswap: Convert pool " Sebastian Andrzej Siewior
2016-12-02 0:13 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-26 23:13 ` [PATCH 13/22] iommu/vt-d: Convert " Sebastian Andrzej Siewior
2016-12-02 0:13 ` [tip:smp/hotplug] " tip-bot for Anna-Maria Gleixner
2016-11-26 23:13 ` [PATCH 14/22] mm/compaction: " Sebastian Andrzej Siewior
2016-12-02 0:14 ` [tip:smp/hotplug] " tip-bot for Anna-Maria Gleixner
2016-11-26 23:13 ` [PATCH 15/22] arm64/cpuinfo: Make hotplug notifier symmetric Sebastian Andrzej Siewior
2016-11-29 17:22 ` Suzuki K Poulose
2016-12-02 0:14 ` [tip:smp/hotplug] " tip-bot for Anna-Maria Gleixner
2016-11-26 23:13 ` [PATCH 16/22] arm64/cpuinfo: Convert to hotplug state machine Sebastian Andrzej Siewior
2016-11-29 17:26 ` Suzuki K Poulose
2016-12-02 0:15 ` [tip:smp/hotplug] " tip-bot for Anna-Maria Gleixner
2016-11-26 23:13 ` [PATCH 17/22] KVM/PPC/Book3S HV: " Sebastian Andrzej Siewior
2016-12-02 0:15 ` [tip:smp/hotplug] " tip-bot for Anna-Maria Gleixner
2016-11-26 23:13 ` [PATCH 18/22] zram: " Sebastian Andrzej Siewior
2016-12-02 0:16 ` [tip:smp/hotplug] " tip-bot for Anna-Maria Gleixner
2016-11-26 23:13 ` [PATCH 19/22] soc/fsl/qbman: " Sebastian Andrzej Siewior
2016-12-02 0:16 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-26 23:13 ` [PATCH 20/22] " Sebastian Andrzej Siewior
2016-12-02 0:17 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-11-26 23:13 ` [PATCH 21/22] staging/lustre/libcfs: " Sebastian Andrzej Siewior
2016-12-02 10:18 ` [PATCH 21/22 v2] " Sebastian Andrzej Siewior
2016-12-02 10:42 ` Greg Kroah-Hartman
2016-12-02 11:00 ` [PATCH 21/22 v3] " Sebastian Andrzej Siewior
2016-11-26 23:13 ` [PATCH 22/22] Remove obsolete cpu hotplug register / unregister functions Sebastian Andrzej Siewior
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=alpine.DEB.2.20.1612271211490.3687@nanos \
--to=tglx@linutronix.de \
--cc=bigeasy@linutronix.de \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=peterz@infradead.org \
--cc=sam@ravnborg.org \
/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
Powered by JetHome