[PATCH 1/5] sched: Rename init_rq_hrtick to hrtick_rq_init

Do that rename in order to normalize the hrtick namespace. Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Christoph Lameter Cc: Luiz Capitulino Cc: Mike Galbraith Cc: Paul E. McKenney Cc: Peter Zijlstra Cc: Rik van Riel Cc: Thomas Gleixner Cc: Wanpeng Li Cc: Ingo Molnar

[PATCH 5/5] sched/isolation: Document "nohz_offload" flag

Document the interface to offload the 1Hz scheduler tick in full dynticks mode. Also improve the comment about the existing "nohz" flag in order to differentiate its behaviour. Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Christoph Lameter Cc: Luiz Capitulino Cc: Mike

[PATCH 0/5] isolation: 1Hz residual tick offloading v3

HEAD: 4b07980eaca4012852b5f02c2a55b1114c475804 Thanks, Frederic --- Frederic Weisbecker (5): sched: Rename init_rq_hrtick to hrtick_rq_init sched/isolation: Add scheduler tick offloading interface nohz: Allow to check if remote CPU tick is stopped sched/isol

[PATCH 3/5] nohz: Allow to check if remote CPU tick is stopped

This check is racy but provides a good heuristic to determine whether a CPU may need a remote tick or not. Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Christoph Lameter Cc: Luiz Capitulino Cc: Mike Galbraith Cc: Paul E. McKenney Cc: Peter Zijlstra Cc: Rik van Riel Cc: Thomas

[PATCH 2/5] sched/isolation: Add scheduler tick offloading interface

Add the boot option that will allow us to offload the 1Hz scheduler tick to the housekeeping CPU. Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Christoph Lameter Cc: Luiz Capitulino Cc: Mike Galbraith Cc: Paul E. McKenney Cc: Peter Zijlstra Cc: Rik van Riel Cc: Thomas Gleixner

Re: [patch 2/4] nohz: Prevent erroneous tick stop invocations

oft interrupt to the > conditions in tick_nohz_stop_sched_tick() which avoid calling > get_next_timer_interrupt(). That keeps the tick sched timer on the tick and > prevents a repetitive programming of an already expired timer. > > Signed-off-by: Thomas Gleixner > Cc: Peter

Re: [patch 2/4] nohz: Prevent erroneous tick stop invocations

On Fri, Dec 22, 2017 at 03:51:13PM +0100, Thomas Gleixner wrote: > The conditions in irq_exit() to invoke tick_nohz_irq_exit() are: > > if ((idle_cpu(cpu) && !need_resched()) || tick_nohz_full_cpu(cpu)) > > This is too permissive in various aspects: > > 1) If need_resched() is set, then the

Re: [patch 1/4] timer: Use deferrable base independent of base::nohz_active

al. > > Fixes: 500462a9de65 ("timers: Switch to a non-cascading wheel") > Signed-off-by: Anna-Maria Gleixner > Signed-off-by: Thomas Gleixner > Cc: sta...@vger.kernel.org > Cc: r...@linutronix.de Nice catch! Reviewed-by: Frederic Weisbecker Thanks!

[PATCH 5/5] sched/isolation: Document "nohz_offload" flag

Document the interface to offload the 1Hz scheduler tick in full dynticks mode. Also improve the comment about the existing "nohz" flag in order to differentiate its behaviour. Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Christoph Lameter Cc: Luiz Capitulino Cc: Mike

[PATCH 3/5] nohz: Allow to check if remote CPU tick is stopped

This check is racy but provides a good heuristic to determine whether a CPU may need a remote tick or not. Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Christoph Lameter Cc: Luiz Capitulino Cc: Mike Galbraith Cc: Paul E. McKenney Cc: Peter Zijlstra Cc: Rik van Riel Cc: Thomas

[PATCH 4/5] sched/isolation: Residual 1Hz scheduler tick offload

l now outsource these scheduler ticks to the global workqueue so that a housekeeping CPU handles that tick remotely. Note it's still up to the user to affine the global workqueues to the housekeeping CPUs through /sys/devices/virtual/workqueue/cpumask or domains isolation. Signed-off-by: Fre

[PATCH 2/5] sched/isolation: Add scheduler tick offloading interface

Add the boot option that will allow us to offload the 1Hz scheduler tick to the housekeeping CPU. Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Christoph Lameter Cc: Luiz Capitulino Cc: Mike Galbraith Cc: Paul E. McKenney Cc: Peter Zijlstra Cc: Rik van Riel Cc: Thomas Gleixner

[PATCH 0/5] isolation: 1Hz residual tick offloading v2

-v2 HEAD: bde624c847147fe500fa65e9c78850e43b933d2d Thanks, Frederic --- Frederic Weisbecker (5): sched: Rename init_rq_hrtick to hrtick_rq_init sched/isolation: Add scheduler tick offloading interface nohz: Allow to check if remote CPU tick is stopped sched

[PATCH 1/5] sched: Rename init_rq_hrtick to hrtick_rq_init

Do that rename in order to normalize the hrtick namespace. Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Christoph Lameter Cc: Luiz Capitulino Cc: Mike Galbraith Cc: Paul E. McKenney Cc: Peter Zijlstra Cc: Rik van Riel Cc: Thomas Gleixner Cc: Wanpeng Li Cc: Ingo Molnar

Re: [PATCH 1/5] sched: Move tick code to a separate file

2017-12-19 10:08 UTC+01:00, Peter Zijlstra : > On Tue, Dec 19, 2017 at 04:23:54AM +0100, Frederic Weisbecker wrote: >> Let's debloat some more core.c >> Also we are going to expand the tick code even further to introduce >> scheduler tick offloading. > > Not a

Re: [PATCH 4/5] sched/isolation: Residual 1Hz scheduler tick offload

2017-12-19 17:03 UTC+01:00, Christopher Lameter : > On Tue, 19 Dec 2017, Frederic Weisbecker wrote: > >> Adding the boot parameter "isolcpus=nohz_offload" will now outsource >> these scheduler ticks to the global workqueue so that a housekeeping CPU >> handles

Re: [PATCH 4/5] sched/isolation: Residual 1Hz scheduler tick offload

2017-12-19 10:19 UTC+01:00, Peter Zijlstra : > On Tue, Dec 19, 2017 at 04:23:57AM +0100, Frederic Weisbecker wrote: >> When a CPU runs in full dynticks mode, a 1Hz tick remains in order to >> keep the scheduler stats alive. However this residual tick is a burden >> for Real-

[PATCH 2/5] sched: Rename init_rq_hrtick to hrtick_rq_init

Do that rename in order to normalize the hrtick namespace. Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Christoph Lameter Cc: Luiz Capitulino Cc: Mike Galbraith Cc: Paul E. McKenney Cc: Peter Zijlstra Cc: Rik van Riel Cc: Thomas Gleixner Cc: Wanpeng Li Cc: Ingo Molnar

[PATCH 3/5] sched/isolation: Add scheduler tick offloading interface

Add the boot option that will allow us to offload the 1Hz scheduler tick to the housekeeping CPU. Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Christoph Lameter Cc: Luiz Capitulino Cc: Mike Galbraith Cc: Paul E. McKenney Cc: Peter Zijlstra Cc: Rik van Riel Cc: Thomas Gleixner

[PATCH 4/5] sched/isolation: Residual 1Hz scheduler tick offload

eduler ticks to the global workqueue so that a housekeeping CPU handles that tick remotely. Note it's still up to the user to affine the global workqueues to the housekeeping CPUs through /sys/devices/virtual/workqueue/cpumask or domains isolation. Signed-off-by: Frederic Weisbecker C

[RFC PATCH 0/5] isolation: 1Hz residual tick offloading

s boot option to offload the residual 1Hz tick. For quick testing, say on CPUs 1-7: "isolcpus=nohz_offload,domain,1-7" git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git timers/0z HEAD: a9366794579a4ff71ec3546b9983536a669fbfb9 Thanks, Freder

[PATCH 5/5] sched/isolation: Document "nohz_offload" flag

Document the interface to offload the 1Hz scheduler tick in full dynticks mode. Also improve the comment about the existing "nohz" flag in order to differentiate its behaviour. Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Christoph Lameter Cc: Luiz Capitulino Cc: Mike

[PATCH 1/5] sched: Move tick code to a separate file

Let's debloat some more core.c Also we are going to expand the tick code even further to introduce scheduler tick offloading. Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Christoph Lameter Cc: Luiz Capitulino Cc: Mike Galbraith Cc: Paul E. McKenney Cc: Peter Zijlstra Cc

[tip:sched/urgent] sched/isolation: Document boot parameters dependency on CONFIG_CPU_ISOLATION=y

Commit-ID: d94d105329e4a8a874853b5bd854b6587c41adda Gitweb: https://git.kernel.org/tip/d94d105329e4a8a874853b5bd854b6587c41adda Author: Frederic Weisbecker AuthorDate: Thu, 14 Dec 2017 19:18:27 +0100 Committer: Ingo Molnar CommitDate: Mon, 18 Dec 2017 13:46:42 +0100 sched/isolation

[tip:sched/urgent] sched/isolation: Enable CONFIG_CPU_ISOLATION=y by default

Commit-ID: 2c43838c99d9d23f17eb2bdadafcb2879cca6995 Gitweb: https://git.kernel.org/tip/2c43838c99d9d23f17eb2bdadafcb2879cca6995 Author: Frederic Weisbecker AuthorDate: Thu, 14 Dec 2017 19:18:26 +0100 Committer: Ingo Molnar CommitDate: Mon, 18 Dec 2017 13:46:42 +0100 sched/isolation

[PATCH 3/3] sched/isolation: Document boot parameters dependency on CONFIG_CPU_ISOLATION

The "isolcpus=" and "nohz_full=" boot parameters depend on CPU Isolation support. Let's document that. Signed-off-by: Frederic Weisbecker Cc: Paul E. McKenney Cc: Thomas Gleixner Cc: Chris Metcalf Cc: Christoph Lameter Cc: Linus Torvalds Cc: Luiz Capitulino Cc:

[PATCH 2/3] sched/isolation: Enable CONFIG_CPU_ISOLATION=y by default

for those who want to tinify their kernels. Signed-off-by: Frederic Weisbecker Cc: Paul E. McKenney Cc: Thomas Gleixner Cc: Chris Metcalf Cc: Christoph Lameter Cc: Linus Torvalds Cc: Luiz Capitulino Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Rik van Riel Cc: Wanpeng Li Cc: Ingo Molnar

[GIT PULL] Nohz and isolation fixes v2

Ingo, Please pull the nohz/fixes-v2 branch that can be found at: git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git nohz/fixes-v2 HEAD: 5ecdec22346b99967e8b4e8d78a5b4d23bf216f9 Thanks, Frederic --- Frederic Weisbecker (2): sched/isolation: Enable

[PATCH 1/3] sched/isolation: Make NO_HZ_FULL select CPU_ISOLATION

Cc: Luiz Capitulino Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Rik van Riel Cc: Wanpeng Li Cc: Ingo Molnar Cc: John Stultz Signed-off-by: Frederic Weisbecker --- kernel/time/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig index e776fc8..f

Re: [GIT PULL] Nohz / isolation fixes

2017-12-14 15:14 UTC+01:00, Frederic Weisbecker : > Ingo, > > Please pull the nohz/fixes branch that can be found at: > > git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git > nohz/fixes > > HEAD: 11c3146353bb83028ace8ad089a911c390395986 Sor

[PATCH 2/3] sched/isolation: Enable CONFIG_CPU_ISOLATION=y by default

e previous behaviour but keep it optable for those who want to tinify their kernels. Signed-off-by: Frederic Weisbecker Cc: Paul E. McKenney Cc: Thomas Gleixner Cc: Chris Metcalf Cc: Christoph Lameter Cc: Linus Torvalds Cc: Luiz Capitulino Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Rik van

[PATCH 3/3] sched/isolation: Document boot parameters dependency on CONFIG_CPU_ISOLATION

From: "Paul E. McKenney" The "isolcpus=" and "nohz_full=" boot parameters depend on CPU Isolation support. Let's document that. Signed-off-by: Frederic Weisbecker Cc: Paul E. McKenney Cc: Thomas Gleixner Cc: Chris Metcalf Cc: Christoph Lameter Cc: Linu

[PATCH 1/3] sched/isolation: Make NO_HZ_FULL select CPU_ISOLATION

Cc: Luiz Capitulino Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Rik van Riel Cc: Wanpeng Li Cc: Ingo Molnar Cc: John Stultz Signed-off-by: Frederic Weisbecker --- kernel/time/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig index e776fc8..f

[GIT PULL] Nohz / isolation fixes

Ingo, Please pull the nohz/fixes branch that can be found at: git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git nohz/fixes HEAD: 11c3146353bb83028ace8ad089a911c390395986 Thanks, Frederic --- Paul E. McKenney (3): sched/isolation: Make NO_HZ_FULL se

Re: [RESEND PATCH] irq_work: improve the flag definitions

2017-12-11 11:59 UTC+01:00, Bartosz Golaszewski : > 2017-11-27 11:52 GMT+01:00 Bartosz Golaszewski : > It's been a couple months since I first posted this patch. Can it be > applied for 4.16? > > @Frederic: I noticed you picked up some irq_work patches in the past > so I'm Cc'ing you. Sure, I'll t

Re: [RESEND PATCH] irq_work: improve the flag definitions

e we're at it: use the BIT() macro for all flags. > > Signed-off-by: Bartosz Golaszewski Nice! Acked-by: Frederic Weisbecker

Re: [PATCH] sched/isolation: Make NO_HZ_FULL select CPU_ISOLATION

2017-12-07 18:29 UTC+01:00, Paul E. McKenney : > On Thu, Dec 07, 2017 at 05:14:54PM +0100, Frederic Weisbecker wrote: >> 2017-12-04 18:16 UTC+01:00, Paul E. McKenney >> : >> > On Mon, Dec 04, 2017 at 04:53:15PM +0100, Frederic Weisbecker wrote: >> >> 2017-12-

Re: [PATCH] sched/isolation: Make NO_HZ_FULL select CPU_ISOLATION

2017-12-04 18:16 UTC+01:00, Paul E. McKenney : > On Mon, Dec 04, 2017 at 04:53:15PM +0100, Frederic Weisbecker wrote: >> 2017-12-02 20:24 UTC+01:00, Paul E. McKenney >> I would prefer to keep it. It's useful for automated boot testing >> based on configs such as 0-day

Re: [PATCH] sched/isolation: Make NO_HZ_FULL select CPU_ISOLATION

2017-12-02 20:24 UTC+01:00, Paul E. McKenney : > On Sat, Dec 02, 2017 at 02:59:12PM +0100, Frederic Weisbecker wrote: >> 2017-11-30 21:20 UTC+01:00, Paul E. McKenney >> : >> > Commit 5c4991e24c69 ("sched/isolation: Split out new >> > CONFIG_CPU_ISOLATION

Re: [PATCH] sched/isolation: Make NO_HZ_FULL select CPU_ISOLATION

2017-11-30 21:20 UTC+01:00, Paul E. McKenney : > Commit 5c4991e24c69 ("sched/isolation: Split out new > CONFIG_CPU_ISOLATION=y config from CONFIG_NO_HZ_FULL") can result in RCU > CPU stall warnings when running rcutorture with CONFIG_NO_HZ_FULL_ALL=y > and CONFIG_CPU_ISOLATION=n. These warnings ar

[tip:locking/core] rcu: Use lockdep to assert IRQs are disabled/enabled

Commit-ID: b04db8e19fc2e9131524dec43057c1b96d5ba3ba Gitweb: https://git.kernel.org/tip/b04db8e19fc2e9131524dec43057c1b96d5ba3ba Author: Frederic Weisbecker AuthorDate: Mon, 6 Nov 2017 16:01:30 +0100 Committer: Ingo Molnar CommitDate: Wed, 8 Nov 2017 11:13:55 +0100 rcu: Use lockdep to

[tip:locking/core] timers/posix-cpu-timers: Use lockdep to assert IRQs are disabled/enabled

Commit-ID: a69682200db9c2c26594188f81dd2df560af4683 Gitweb: https://git.kernel.org/tip/a69682200db9c2c26594188f81dd2df560af4683 Author: Frederic Weisbecker AuthorDate: Mon, 6 Nov 2017 16:01:28 +0100 Committer: Ingo Molnar CommitDate: Wed, 8 Nov 2017 11:13:54 +0100 timers/posix-cpu

[tip:locking/core] netpoll: Use lockdep to assert IRQs are disabled/enabled

Commit-ID: af0733937317e1e03b60f3af8cf9cd59d665593c Gitweb: https://git.kernel.org/tip/af0733937317e1e03b60f3af8cf9cd59d665593c Author: Frederic Weisbecker AuthorDate: Mon, 6 Nov 2017 16:01:29 +0100 Committer: Ingo Molnar CommitDate: Wed, 8 Nov 2017 11:13:54 +0100 netpoll: Use lockdep

[tip:locking/core] sched/clock, sched/cputime: Use lockdep to assert IRQs are disabled/enabled

Commit-ID: 2c11dba00a39007b457c7607c1b1a4db95ca04bc Gitweb: https://git.kernel.org/tip/2c11dba00a39007b457c7607c1b1a4db95ca04bc Author: Frederic Weisbecker AuthorDate: Mon, 6 Nov 2017 16:01:27 +0100 Committer: Ingo Molnar CommitDate: Wed, 8 Nov 2017 11:13:53 +0100 sched/clock, sched

[tip:locking/core] irq_work: Use lockdep to assert IRQs are disabled/enabled

Commit-ID: 3c7169a3bf8216a56761a8edf775072dd36a00a0 Gitweb: https://git.kernel.org/tip/3c7169a3bf8216a56761a8edf775072dd36a00a0 Author: Frederic Weisbecker AuthorDate: Mon, 6 Nov 2017 16:01:26 +0100 Committer: Ingo Molnar CommitDate: Wed, 8 Nov 2017 11:13:52 +0100 irq_work: Use

[tip:locking/core] irq/timings: Use lockdep to assert IRQs are disabled/enabled

Commit-ID: a934d4d15f040cdd254350e7270b35cc7521e12e Gitweb: https://git.kernel.org/tip/a934d4d15f040cdd254350e7270b35cc7521e12e Author: Frederic Weisbecker AuthorDate: Mon, 6 Nov 2017 16:01:25 +0100 Committer: Ingo Molnar CommitDate: Wed, 8 Nov 2017 11:13:52 +0100 irq/timings: Use

[tip:locking/core] perf/core: Use lockdep to assert IRQs are disabled/enabled

Commit-ID: 164446455a5d3f1402b5a0ea42acce33fd576ed7 Gitweb: https://git.kernel.org/tip/164446455a5d3f1402b5a0ea42acce33fd576ed7 Author: Frederic Weisbecker AuthorDate: Mon, 6 Nov 2017 16:01:24 +0100 Committer: Ingo Molnar CommitDate: Wed, 8 Nov 2017 11:13:51 +0100 perf/core: Use

[tip:locking/core] x86: Use lockdep to assert IRQs are disabled/enabled

Commit-ID: 7a10e2a9190628a4024ea394ce7bd641ae40ffd1 Gitweb: https://git.kernel.org/tip/7a10e2a9190628a4024ea394ce7bd641ae40ffd1 Author: Frederic Weisbecker AuthorDate: Mon, 6 Nov 2017 16:01:23 +0100 Committer: Ingo Molnar CommitDate: Wed, 8 Nov 2017 11:13:50 +0100 x86: Use lockdep to

[tip:locking/core] smp/core: Use lockdep to assert IRQs are disabled/enabled

Commit-ID: 83efcbd028ad3aec36b5a3882cfa32490c135df7 Gitweb: https://git.kernel.org/tip/83efcbd028ad3aec36b5a3882cfa32490c135df7 Author: Frederic Weisbecker AuthorDate: Mon, 6 Nov 2017 16:01:22 +0100 Committer: Ingo Molnar CommitDate: Wed, 8 Nov 2017 11:13:50 +0100 smp/core: Use

[tip:locking/core] timers/hrtimer: Use lockdep to assert IRQs are disabled/enabled

Commit-ID: 53bef3fd47f69e40b52c9f9acd3551dfff9f8702 Gitweb: https://git.kernel.org/tip/53bef3fd47f69e40b52c9f9acd3551dfff9f8702 Author: Frederic Weisbecker AuthorDate: Mon, 6 Nov 2017 16:01:21 +0100 Committer: Ingo Molnar CommitDate: Wed, 8 Nov 2017 11:13:49 +0100 timers/hrtimer: Use

[tip:locking/core] timers/nohz: Use lockdep to assert IRQs are disabled/enabled

Commit-ID: ebf3adbad012b89c4a51a3beae718a587d988a3a Gitweb: https://git.kernel.org/tip/ebf3adbad012b89c4a51a3beae718a587d988a3a Author: Frederic Weisbecker AuthorDate: Mon, 6 Nov 2017 16:01:20 +0100 Committer: Ingo Molnar CommitDate: Wed, 8 Nov 2017 11:13:49 +0100 timers/nohz: Use

[tip:locking/core] workqueue: Use lockdep to assert IRQs are disabled/enabled

Commit-ID: 8e8eb730759f9cfd7a761b0b4ee41d714e720993 Gitweb: https://git.kernel.org/tip/8e8eb730759f9cfd7a761b0b4ee41d714e720993 Author: Frederic Weisbecker AuthorDate: Mon, 6 Nov 2017 16:01:19 +0100 Committer: Ingo Molnar CommitDate: Wed, 8 Nov 2017 11:13:48 +0100 workqueue: Use

[tip:locking/core] irq/softirqs: Use lockdep to assert IRQs are disabled/enabled

Commit-ID: f71b74bca637fca7de78f1d44eaefde5bc900f9f Gitweb: https://git.kernel.org/tip/f71b74bca637fca7de78f1d44eaefde5bc900f9f Author: Frederic Weisbecker AuthorDate: Mon, 6 Nov 2017 16:01:18 +0100 Committer: Ingo Molnar CommitDate: Wed, 8 Nov 2017 11:13:48 +0100 irq/softirqs: Use

[tip:locking/core] locking/lockdep: Add IRQs disabled/enabled assertion APIs: lockdep_assert_irqs_enabled()/disabled()

Commit-ID: f54bb2ec02c839f6bfe3e8d438cd93d30b4809dd Gitweb: https://git.kernel.org/tip/f54bb2ec02c839f6bfe3e8d438cd93d30b4809dd Author: Frederic Weisbecker AuthorDate: Mon, 6 Nov 2017 16:01:17 +0100 Committer: Ingo Molnar CommitDate: Wed, 8 Nov 2017 11:13:47 +0100 locking/lockdep: Add

[PATCH 02/14] irq: Use lockdep to assert IRQs are disabled/enabled

Use lockdep to check that IRQs are enabled or disabled as expected. This way the sanity check only shows overhead when concurrency correctness debug code is enabled. Signed-off-by: Frederic Weisbecker Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Paul E. McKenney --- kernel

[GIT PULL] lockdep: Add lightweight IRQs disabled/enabled check v2

lags state. Thanks, Frederic --- Frederic Weisbecker (14): lockdep: Add IRQs disabled/enabled assertion irq: Use lockdep to assert IRQs are disabled/enabled workqueue: Use lockdep to assert IRQs are disabled/enabled nohz: Use lockdep to assert IRQs are disabl

[PATCH 01/14] lockdep: Add IRQs disabled/enabled assertion

its machinery. This will allow us to get rid of the flags pop and check overhead from fast path when kernel is built for production. Suggested-by: Peter Zijlstra Signed-off-by: Frederic Weisbecker Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Paul E. McKenney --- include/linux

[PATCH 03/14] workqueue: Use lockdep to assert IRQs are disabled/enabled

Use lockdep to check that IRQs are enabled or disabled as expected. This way the sanity check only shows overhead when concurrency correctness debug code is enabled. Signed-off-by: Frederic Weisbecker Acked-by: Tejun Heo Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Paul E

[PATCH 05/14] hrtimer: Use lockdep to assert IRQs are disabled/enabled

Use lockdep to check that IRQs are enabled or disabled as expected. This way the sanity check only shows overhead when concurrency correctness debug code is enabled. Signed-off-by: Frederic Weisbecker Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Paul E. McKenney --- kernel

[PATCH 06/14] smp: Use lockdep to assert IRQs are disabled/enabled

Use lockdep to check that IRQs are enabled or disabled as expected. This way the sanity check only shows overhead when concurrency correctness debug code is enabled. Signed-off-by: Frederic Weisbecker Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Paul E. McKenney --- kernel

[PATCH 04/14] nohz: Use lockdep to assert IRQs are disabled/enabled

Use lockdep to check that IRQs are enabled or disabled as expected. This way the sanity check only shows overhead when concurrency correctness debug code is enabled. Signed-off-by: Frederic Weisbecker Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Paul E. McKenney --- kernel

[PATCH 08/14] perf: Use lockdep to assert IRQs are disabled/enabled

Use lockdep to check that IRQs are enabled or disabled as expected. This way the sanity check only shows overhead when concurrency correctness debug code is enabled. Signed-off-by: Frederic Weisbecker Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Paul E. McKenney --- kernel

[PATCH 09/14] irq/timings: Use lockdep to assert IRQs are disabled/enabled

Use lockdep to check that IRQs are enabled or disabled as expected. This way the sanity check only shows overhead when concurrency correctness debug code is enabled. Signed-off-by: Frederic Weisbecker Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Paul E. McKenney --- kernel/irq

[PATCH 12/14] posix-cpu-timers: Use lockdep to assert IRQs are disabled/enabled

Use lockdep to check that IRQs are enabled or disabled as expected. This way the sanity check only shows overhead when concurrency correctness debug code is enabled. Signed-off-by: Frederic Weisbecker Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Paul E. McKenney --- kernel

[PATCH 14/14] rcu: Use lockdep to assert IRQs are disabled/enabled

Lockdep now has an integrated IRQs disabled/enabled sanity check. Just use it instead of the ad-hoc RCU version. Signed-off-by: Frederic Weisbecker Acked-by: Paul E. McKenney Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Thomas Gleixner --- kernel/rcu/tree.c| 16 kernel

[PATCH 11/14] sched: Use lockdep to assert IRQs are disabled/enabled

Use lockdep to check that IRQs are enabled or disabled as expected. This way the sanity check only shows overhead when concurrency correctness debug code is enabled. Signed-off-by: Frederic Weisbecker Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Paul E. McKenney --- kernel

[PATCH 13/14] netpoll: Use lockdep to assert IRQs are disabled/enabled

Use lockdep to check that IRQs are enabled or disabled as expected. This way the sanity check only shows overhead when concurrency correctness debug code is enabled. Signed-off-by: Frederic Weisbecker Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Paul E. McKenney Cc: David S

[PATCH 10/14] irq_work: Use lockdep to assert IRQs are disabled/enabled

Use lockdep to check that IRQs are enabled or disabled as expected. This way the sanity check only shows overhead when concurrency correctness debug code is enabled. Signed-off-by: Frederic Weisbecker Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Paul E. McKenney --- kernel

[PATCH 07/14] x86: Use lockdep to assert IRQs are disabled/enabled

. And to quote Peter Zijlstra: The whole if !disabled, disable logic is uber paranoid programming, but I don't think we've ever seen that WARN trigger, and if it does (and then burns the kernel) we at least know what happend. Signed-off-by: Frederic Weisbecker

Re: [PATCH 07/14] x86: Use lockdep to assert IRQs are disabled/enabled

2017-10-22 11:20 UTC+02:00, Peter Zijlstra : > On Fri, Oct 20, 2017 at 02:56:04AM +0200, Frederic Weisbecker wrote: >> diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c >> index 03505ff..b4f3a55 100644 >> --- a/arch/x86/entry/common.c >> +++ b/arch/x86/

[tip:sched/core] sched/isolation: Document isolcpus= boot parameter flags, mark it deprecated

Commit-ID: b0d40d2b22fe48cfcbbfb137fd198be0a1cd8a85 Gitweb: https://git.kernel.org/tip/b0d40d2b22fe48cfcbbfb137fd198be0a1cd8a85 Author: Frederic Weisbecker AuthorDate: Tue, 31 Oct 2017 04:18:34 +0100 Committer: Ingo Molnar CommitDate: Tue, 31 Oct 2017 10:29:39 +0100 sched/isolation

[PATCH v7] housekeeping: Document isolcpus flags

Document the latest updates on the isolcpus boot option. While at it, let's also fix the details about the preferred way to isolate a set of CPUs from the scheduler general domains. Cpusets offer a much better interface to achieve that. Signed-off-by: Frederic Weisbecker Cc: Chris Metcal

[PATCH] irq_work: Don't reinvent the wheel but use existing llist API

From: Byungchul Park Although llist provides proper APIs, they are not used. Make them used. Signed-off-by: Byungchul Park Cc: Peter Zijlstra Signed-off-by: Frederic Weisbecker --- kernel/irq_work.c | 6 +- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/kernel/irq_work.c b

Re: [tip:sched/core] sched/isolation: Document the isolcpus= flags

2017-10-27 20:21 UTC+02:00, Ingo Molnar : > > * Frederic Weisbecker wrote: > >> 2017-10-27 19:06 UTC+02:00, Ingo Molnar : >> > >> > * Frederic Weisbecker wrote: >> > >> >> 2017-10-27 15:58 UTC+02:00, Peter Zijlstra : >> >>

Re: [tip:sched/core] sched/isolation: Document the isolcpus= flags

2017-10-27 19:06 UTC+02:00, Ingo Molnar : > > * Frederic Weisbecker wrote: > >> 2017-10-27 15:58 UTC+02:00, Peter Zijlstra : >> > On Fri, Oct 27, 2017 at 05:06:25AM -0700, tip-bot for Frederic >> > Weisbecker >> > wrote: >> >> + isol

Re: [tip:sched/core] sched/isolation: Document the isolcpus= flags

2017-10-27 15:58 UTC+02:00, Peter Zijlstra : > On Fri, Oct 27, 2017 at 05:06:25AM -0700, tip-bot for Frederic Weisbecker > wrote: >> +isolcpus= [KNL,SMP] Isolate a given set of CPUs from disturbance. >> +Format: [flag-list,] >> + >> +

[tip:sched/core] sched/isolation: Document the isolcpus= flags

Commit-ID: 98a06af93784a6ae541e9fc6292ef26177832543 Gitweb: https://git.kernel.org/tip/98a06af93784a6ae541e9fc6292ef26177832543 Author: Frederic Weisbecker AuthorDate: Fri, 27 Oct 2017 04:42:39 +0200 Committer: Ingo Molnar CommitDate: Fri, 27 Oct 2017 09:55:32 +0200 sched/isolation

[tip:sched/core] sched/isolation: Add basic isolcpus flags

Commit-ID: 150dfee95feb913876ced5cc559a342384e8ea97 Gitweb: https://git.kernel.org/tip/150dfee95feb913876ced5cc559a342384e8ea97 Author: Frederic Weisbecker AuthorDate: Fri, 27 Oct 2017 04:42:38 +0200 Committer: Ingo Molnar CommitDate: Fri, 27 Oct 2017 09:55:31 +0200 sched/isolation

[tip:sched/core] sched/isolation: Move isolcpus= handling to the housekeeping code

Commit-ID: edb9382175c3ebdced8ffdb3e0f20052ad9fdbe9 Gitweb: https://git.kernel.org/tip/edb9382175c3ebdced8ffdb3e0f20052ad9fdbe9 Author: Frederic Weisbecker AuthorDate: Fri, 27 Oct 2017 04:42:37 +0200 Committer: Ingo Molnar CommitDate: Fri, 27 Oct 2017 09:55:30 +0200 sched/isolation

[tip:sched/core] sched/isolation: Handle the nohz_full= parameter

Commit-ID: 6f1982fedd59856bcc42a9b521be4c3ffd2f60a7 Gitweb: https://git.kernel.org/tip/6f1982fedd59856bcc42a9b521be4c3ffd2f60a7 Author: Frederic Weisbecker AuthorDate: Fri, 27 Oct 2017 04:42:36 +0200 Committer: Ingo Molnar CommitDate: Fri, 27 Oct 2017 09:55:30 +0200 sched/isolation

[tip:sched/core] sched/isolation: Introduce housekeeping flags

Commit-ID: de201559df872f83d0c08fb4effe3efd28e6cbc8 Gitweb: https://git.kernel.org/tip/de201559df872f83d0c08fb4effe3efd28e6cbc8 Author: Frederic Weisbecker AuthorDate: Fri, 27 Oct 2017 04:42:35 +0200 Committer: Ingo Molnar CommitDate: Fri, 27 Oct 2017 09:55:29 +0200 sched/isolation

[tip:sched/core] sched/isolation: Use its own static key

Commit-ID: e179f5a04ba46ee5c5439480c2bfd68c358168b7 Gitweb: https://git.kernel.org/tip/e179f5a04ba46ee5c5439480c2bfd68c358168b7 Author: Frederic Weisbecker AuthorDate: Fri, 27 Oct 2017 04:42:32 +0200 Committer: Ingo Molnar CommitDate: Fri, 27 Oct 2017 09:55:27 +0200 sched/isolation

[tip:sched/core] sched/isolation: Split out new CONFIG_CPU_ISOLATION=y config from CONFIG_NO_HZ_FULL

Commit-ID: 5c4991e24c69737bd41fc2737b1e3980abbf73f9 Gitweb: https://git.kernel.org/tip/5c4991e24c69737bd41fc2737b1e3980abbf73f9 Author: Frederic Weisbecker AuthorDate: Fri, 27 Oct 2017 04:42:34 +0200 Committer: Ingo Molnar CommitDate: Fri, 27 Oct 2017 09:55:28 +0200 sched/isolation

[tip:sched/core] sched/isolation: Rename is_housekeeping_cpu() to housekeeping_cpu()

Commit-ID: 204c083a009378dfa751175b5fcddc75988bab6c Gitweb: https://git.kernel.org/tip/204c083a009378dfa751175b5fcddc75988bab6c Author: Frederic Weisbecker AuthorDate: Fri, 27 Oct 2017 04:42:33 +0200 Committer: Ingo Molnar CommitDate: Fri, 27 Oct 2017 09:55:28 +0200 sched/isolation

[tip:sched/core] sched/isolation: Provide a dynamic off-case to housekeeping_any_cpu()

Commit-ID: 9f0ca2d97ef0b5e966be2cfef26c7c094ec14e41 Gitweb: https://git.kernel.org/tip/9f0ca2d97ef0b5e966be2cfef26c7c094ec14e41 Author: Frederic Weisbecker AuthorDate: Fri, 27 Oct 2017 04:42:30 +0200 Committer: Ingo Molnar CommitDate: Fri, 27 Oct 2017 09:55:26 +0200 sched/isolation

[tip:sched/core] sched/isolation: Make the housekeeping cpumask private

Commit-ID: 7e56a1cf4b28f5739526877b8dbad623fae2e4e7 Gitweb: https://git.kernel.org/tip/7e56a1cf4b28f5739526877b8dbad623fae2e4e7 Author: Frederic Weisbecker AuthorDate: Fri, 27 Oct 2017 04:42:31 +0200 Committer: Ingo Molnar CommitDate: Fri, 27 Oct 2017 09:55:26 +0200 sched/isolation

[tip:sched/core] sched/isolation: Move housekeeping related code to its own file

Commit-ID: 7863406143d8da07a61285c5f4c217908dfd Gitweb: https://git.kernel.org/tip/7863406143d8da07a61285c5f4c217908dfd Author: Frederic Weisbecker AuthorDate: Fri, 27 Oct 2017 04:42:28 +0200 Committer: Ingo Molnar CommitDate: Fri, 27 Oct 2017 09:55:24 +0200 sched/isolation

[tip:sched/core] sched/isolation, watchdog: Use housekeeping_cpumask() instead of ad-hoc version

Commit-ID: 13316b31fdaaa45f06793eb7992588359ba6ab9f Gitweb: https://git.kernel.org/tip/13316b31fdaaa45f06793eb7992588359ba6ab9f Author: Frederic Weisbecker AuthorDate: Fri, 27 Oct 2017 04:42:29 +0200 Committer: Ingo Molnar CommitDate: Fri, 27 Oct 2017 09:55:25 +0200 sched/isolation

[PATCH 01/12] housekeeping: Move housekeeping related code to its own file

The housekeeping code is currently tied to the nohz code. As we are planning to make housekeeping independant from it, start with moving the relevant code to its own file. Acked-by: Paul E. McKenney Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Christoph Lameter Cc: Linus Torvalds

[GIT PULL] Housekeeping subsystem v6

/isolation.c and linux/housekeeping.h to linux/sched/isolation.h * Fix tilegx build error reported by Kbuild test robot * Rebase against latest tip:sched/core Thanks, Frederic --- Frederic Weisbecker (12): housekeeping: Move housekeeping related code to its own file watchdog: Use

[PATCH 03/12] housekeeping: Provide a dynamic off-case to housekeeping_any_cpu()

housekeeping_any_cpu() doesn't handle correctly the case where CONFIG_NO_HZ_FULL=y and no CPU is in nohz_full mode. So far no caller needs this but let's prepare to avoid any future surprise. Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Christoph Lameter Cc: Linus To

[PATCH 05/12] housekeeping: Use its own static key

Housekeeping code still depends on nohz_full static key. Since we want to decouple housekeeping from nohz, let's create a housekeeping own static key. It's mostly relevant for calls to is_housekeeping_cpu() from the scheduler. Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc:

[PATCH 07/12] housekeeping: Move it under its own config, independent from NO_HZ

Split housekeeping config from CONFIG_NO_HZ_FULL. This way we finally separate the isolation code from nohz. Although a dependency to CONFIG_NO_HZ_FULL remains for now until the housekeeping code doesn't deal anymore with nohz internals directly. Signed-off-by: Frederic Weisbecker Cc:

[PATCH 11/12] housekeeping: Add basic isolcpus flags

ck offload) and timers, workqueue, RCU, kthread, watchdog, likely all merged together in a common flag ("async"?). In any case, this will have to be modifiable by cpusets. Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Rik van Riel Cc: Peter Zijlstra Cc: Thomas Gleixner Cc

[PATCH 12/12] housekeeping: Document isolcpus flags

Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Rik van Riel Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Mike Galbraith Cc: Ingo Molnar Cc: Christoph Lameter Cc: Paul E. McKenney Cc: Wanpeng Li Cc: Luiz Capitulino --- Documentation/admin-guide/kernel-parameters.txt | 35

[PATCH 09/12] housekeeping: Handle the nohz_full= parameter

be deprecated in the future. We want to control the isolation features from the isolcpus= parameter. Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Christoph Lameter Cc: Linus Torvalds Cc: Luiz Capitulino Cc: Mike Galbraith Cc: Paul E. McKenney Cc: Peter Zijlstra Cc: Rik van Riel

[PATCH 10/12] housekeeping: Move isolcpus to housekeeping

We want to centralize the isolation features on the housekeeping subsystem and scheduler domain isolation is a significant part of it. No intended behaviour change, we just reuse the housekeeping cpumask and core code. Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Rik van Riel Cc

[PATCH 04/12] housekeeping: Make housekeeping cpumask private

Nobody needs to access this detail. housekeeping_cpumask() already takes care about it. Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Christoph Lameter Cc: Linus Torvalds Cc: Luiz Capitulino Cc: Mike Galbraith Cc: Paul E. McKenney Cc: Peter Zijlstra Cc: Rik van Riel Cc: Thomas

[PATCH 08/12] housekeeping: Introduce housekeeping flags

t the risk of overcutting it right now. We can still merge some flags later if they always make sense together. Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Christoph Lameter Cc: Linus Torvalds Cc: Luiz Capitulino Cc: Mike Galbraith Cc: Paul E. McKenney Cc: Peter Zijlstra Cc: Ri

[PATCH 02/12] watchdog: Use housekeeping_cpumask() instead of ad-hoc version

While trying to disable the watchog on nohz_full CPUs, the watchdog implements an ad-hoc version of housekeeping_cpumask(). Lets replace those re-invented lines. Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Christoph Lameter Cc: Linus Torvalds Cc: Luiz Capitulino Cc: Mike

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