[PATCH v2 15/45] rcu: Use get/put_online_cpus_atomic() to prevent CPU offline

tomic() APIs to prevent CPUs from going offline, while invoking from atomic context. Cc: Dipankar Sarma Cc: "Paul E. McKenney" Signed-off-by: Srivatsa S. Bhat --- kernel/rcutree.c |4 1 file changed, 4 insertions(+) diff --git a/kernel/rcutree.c b/kernel/rcutree.c index c

[PATCH v2 14/45] sched/rt: Use get/put_online_cpus_atomic() to prevent CPU offline

Peter Zijlstra Signed-off-by: Srivatsa S. Bhat --- kernel/sched/rt.c | 14 ++ 1 file changed, 14 insertions(+) diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index 01970c8..03d9f38 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -6,6 +6,7 @@ #include &qu

[PATCH v2 13/45] timer: Use get/put_online_cpus_atomic() to prevent CPU offline

ixner Signed-off-by: Srivatsa S. Bhat --- kernel/timer.c |4 1 file changed, 4 insertions(+) diff --git a/kernel/timer.c b/kernel/timer.c index 15ffdb3..5db594c 100644 --- a/kernel/timer.c +++ b/kernel/timer.c @@ -729,6 +729,7 @@ __mod_timer(struct timer_list *timer, unsigned long ex

[PATCH v2 09/45] smp: Use get/put_online_cpus_atomic() to prevent CPU offline

n Cc: Wang YanQing Cc: Shaohua Li Cc: Jan Beulich Cc: liguang Signed-off-by: Srivatsa S. Bhat --- kernel/smp.c | 52 ++-- 1 file changed, 30 insertions(+), 22 deletions(-) diff --git a/kernel/smp.c b/kernel/smp.c index 4dba0f7..1f36d6d 100644

[PATCH v2 08/45] CPU hotplug: Convert preprocessor macros to static inline functions

Convert the macros in the CPU hotplug code to static inline C functions. Cc: Thomas Gleixner Cc: Andrew Morton Cc: Tejun Heo Cc: "Rafael J. Wysocki" Signed-off-by: Srivatsa S. Bhat --- include/linux/cpu.h |9 + 1 file changed, 5 insertions(+), 4 deletions(-) di

[PATCH v2 11/45] migration: Use raw_spin_lock/unlock since interrupts are already disabled

We need not use the raw_spin_lock_irqsave/restore primitives because all CPU_DYING notifiers run with interrupts disabled. So just use raw_spin_lock/unlock. Cc: Ingo Molnar Cc: Peter Zijlstra Signed-off-by: Srivatsa S. Bhat --- kernel/sched/core.c |4 ++-- 1 file changed, 2 insertions

[PATCH v2 10/45] sched/core: Use get/put_online_cpus_atomic() to prevent CPU offline

Peter Zijlstra Signed-off-by: Srivatsa S. Bhat --- kernel/sched/core.c | 23 +-- 1 file changed, 21 insertions(+), 2 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 195658b..accd550 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -11

[PATCH v2 05/45] CPU hotplug: Protect set_cpu_online() to avoid false-positives

Gleixner Cc: Andrew Morton Cc: Yasuaki Ishimatsu Cc: "Rafael J. Wysocki" Signed-off-by: Srivatsa S. Bhat --- kernel/cpu.c |4 1 file changed, 4 insertions(+) diff --git a/kernel/cpu.c b/kernel/cpu.c index 5297ec1..35e7115 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -832,

[PATCH v2 03/45] Documentation, CPU hotplug: Recommend usage of get/put_online_cpus_atomic()

from atomic context. Cc: Rob Landley Cc: linux-...@vger.kernel.org Signed-off-by: Srivatsa S. Bhat --- Documentation/cpu-hotplug.txt | 20 ++-- 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/Documentation/cpu-hotplug.txt b/Documentation/cpu-hotplug.txt index 9f

[PATCH v2 07/45] CPU hotplug: Expose the new debug config option

Signed-off-by: Srivatsa S. Bhat --- lib/Kconfig.debug |8 1 file changed, 8 insertions(+) diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 566cf2b..ec6be74 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -512,6 +512,14 @@ config DEBUG_PREEMPT if kernel co

[PATCH v2 02/45] CPU hotplug: Clarify the usage of different synchronization APIs

: Yasuaki Ishimatsu Cc: "Rafael J. Wysocki" Signed-off-by: Srivatsa S. Bhat --- kernel/cpu.c |7 +++ 1 file changed, 7 insertions(+) diff --git a/kernel/cpu.c b/kernel/cpu.c index 2d03398..860f51a 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -139,6 +139,13 @@ s

[PATCH v2 01/45] CPU hotplug: Provide APIs to prevent CPU offline from atomic context

ation of these APIs to a suitable synchronization scheme. Reviewed-by: Steven Rostedt Cc: Thomas Gleixner Cc: Andrew Morton Cc: Tejun Heo Cc: "Rafael J. Wysocki" Cc: Yasuaki Ishimatsu Signed-off-by: Srivatsa S. Bhat --- include/linux/cpu.h | 20 kernel/cpu.

[PATCH v2 00/45] CPU hotplug: stop_machine()-free CPU hotplug, part 1

l.org/lkml/2012/12/4/88 3. Links to previous versions of this patchset: v1: http://lwn.net/Articles/556138/ -- Srivatsa S. Bhat (45): CPU hotplug: Provide APIs to prevent CPU offline from atomic context CPU hotplug: Clarify the usage of different synchronization APIs Doc

Re: [PATCH 40/45] powerpc, irq: Use GFP_ATOMIC allocations in atomic context

t CPU. My patchset will retain these guarantees even after removing stop_machine(). And these are required for the correct execution of the code in this path, since they rely on these semantics. So I guess I'll retain the patch as it is. Thank you! Regards, Srivatsa S. Bhat -- To unsubsc

Re: [PATCH 04/45] CPU hotplug: Add infrastructure to check lacking hotplug synchronization

On 06/25/2013 04:56 AM, Steven Rostedt wrote: > On Sun, 2013-06-23 at 19:08 +0530, Srivatsa S. Bhat wrote: > > > Just to make the code a little cleaner, can you add: > >> diff --git a/kernel/cpu.c b/kernel/cpu.c >> index 860f51a..e90d9d7 100644 >> --- a/k

Re: [PATCH 22/45] percpu_counter: Use get/put_online_cpus_atomic() to prevent CPU offline

ld be superfluous in this case... But as you said, simply invoking those functions is much simpler ;-) > Can you please at least add a comment explaining that? > Sure, will do. Thanks a lot Tejun! Regards, Srivatsa S. Bhat -- To unsubscribe from this list: send the line "unsubscrib

Re: [PATCH 25/45] staging/octeon: Use get/put_online_cpus_atomic() to prevent CPU offline

On 06/24/2013 12:47 AM, Joe Perches wrote: > On Mon, 2013-06-24 at 00:25 +0530, Srivatsa S. Bhat wrote: >> On 06/23/2013 11:47 PM, Greg Kroah-Hartman wrote: >>> On Sun, Jun 23, 2013 at 07:13:33PM +0530, Srivatsa S. Bhat wrote: > [] >>>> diff --git a/drivers/sta

Re: [PATCH 07/45] CPU hotplug: Expose the new debug config option

On 06/23/2013 08:38 PM, Sergei Shtylyov wrote: > Hello. > > On 23-06-2013 17:39, Srivatsa S. Bhat wrote: > >> Now that we have all the pieces of the CPU hotplug debug infrastructure >> in place, expose the feature by growing a new Kconfig option, >> CONFIG_DEBUG

Re: [PATCH 31/45] alpha/smp: Use get/put_online_cpus_atomic() to prevent CPU offline

On 06/23/2013 11:20 PM, Matt Turner wrote: > On Sun, Jun 23, 2013 at 6:45 AM, Srivatsa S. Bhat > wrote: >> Once stop_machine() is gone from the CPU offline path, we won't be able >> to depend on disabling preemption to prevent CPUs from going offline >> fro

Re: [PATCH 25/45] staging/octeon: Use get/put_online_cpus_atomic() to prevent CPU offline

On 06/23/2013 11:47 PM, Greg Kroah-Hartman wrote: > On Sun, Jun 23, 2013 at 07:13:33PM +0530, Srivatsa S. Bhat wrote: >> Once stop_machine() is gone from the CPU offline path, we won't be able >> to depend on disabling preemption to prevent CPUs from going offline >> fr

[PATCH 01/45] CPU hotplug: Provide APIs to prevent CPU offline from atomic context

ation of these APIs to a suitable synchronization scheme. Cc: Thomas Gleixner Cc: Andrew Morton Cc: Tejun Heo Cc: "Rafael J. Wysocki" Cc: Yasuaki Ishimatsu Signed-off-by: Srivatsa S. Bhat --- include/linux/cpu.h | 18 ++ kernel/cpu.

[PATCH 45/45] tile: Use get/put_online_cpus_atomic() to prevent CPU offline

igned-off-by: Srivatsa S. Bhat --- arch/tile/kernel/module.c |3 +++ arch/tile/kernel/tlb.c| 15 +++ arch/tile/mm/homecache.c |3 +++ 3 files changed, 21 insertions(+) diff --git a/arch/tile/kernel/module.c b/arch/tile/kernel/module.c index 4918d91..db7d858 100644 --- a

[PATCH 44/45] sparc: Use get/put_online_cpus_atomic() to prevent CPU offline

iller" Cc: Sam Ravnborg Cc: Thomas Gleixner Cc: Dave Kleikamp Cc: sparcli...@vger.kernel.org Signed-off-by: Srivatsa S. Bhat --- arch/sparc/kernel/smp_64.c | 12 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel

[PATCH 43/45] sh: Use get/put_online_cpus_atomic() to prevent CPU offline

homas Gleixner Cc: linux...@vger.kernel.org Signed-off-by: Srivatsa S. Bhat --- arch/sh/kernel/smp.c | 12 ++-- 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/arch/sh/kernel/smp.c b/arch/sh/kernel/smp.c index 4569645..42ec182 100644 --- a/arch/sh/kernel/smp.c +++ b/ar

[PATCH 33/45] cris/smp: Use get/put_online_cpus_atomic() to prevent CPU offline

k Cc: Jesper Nilsson Cc: Thomas Gleixner Cc: linux-cris-ker...@axis.com Signed-off-by: Srivatsa S. Bhat --- arch/cris/arch-v32/kernel/smp.c |5 + 1 file changed, 5 insertions(+) diff --git a/arch/cris/arch-v32/kernel/smp.c b/arch/cris/arch-v32/kernel/smp.c index cdd1202..b2d4612 100644

[PATCH 36/45] ia64: smp, tlb: Use get/put_online_cpus_atomic() to prevent CPU offline

nghua Yu Cc: linux-i...@vger.kernel.org Signed-off-by: Srivatsa S. Bhat --- arch/ia64/kernel/smp.c | 12 ++-- arch/ia64/mm/tlb.c |4 ++-- 2 files changed, 8 insertions(+), 8 deletions(-) diff --git a/arch/ia64/kernel/smp.c b/arch/ia64/kernel/smp.c index 9fcd4e6..25991ba 1

[PATCH 39/45] mn10300: Use get/put_online_cpus_atomic() to prevent CPU offline

s Cc: Koichi Yasutake Cc: linux-am33-l...@redhat.com Signed-off-by: Srivatsa S. Bhat --- arch/mn10300/mm/cache-smp.c |3 +++ arch/mn10300/mm/tlb-smp.c | 17 + 2 files changed, 12 insertions(+), 8 deletions(-) diff --git a/arch/mn10300/mm/cache-smp.c b/arch/mn10300/mm/cache-

[PATCH 31/45] alpha/smp: Use get/put_online_cpus_atomic() to prevent CPU offline

ASCII character present in this file! Cc: Richard Henderson Cc: Ivan Kokshaysky Cc: Matt Turner Cc: Thomas Gleixner Cc: linux-al...@vger.kernel.org Signed-off-by: Srivatsa S. Bhat --- arch/alpha/kernel/smp.c | 19 +-- 1 file changed, 9 insertions(+), 10 deletions(-) diff

[PATCH 32/45] blackfin/smp: Use get/put_online_cpus_atomic() to prevent CPU offline

r Cc: Bob Liu Cc: Steven Miao Cc: Thomas Gleixner Cc: uclinux-dist-de...@blackfin.uclinux.org Signed-off-by: Srivatsa S. Bhat --- arch/blackfin/mach-common/smp.c |4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/blackfin/mach-common/smp.c b/arch/blackfin/mach-common/

[PATCH 35/45] ia64: irq, perfmon: Use get/put_online_cpus_atomic() to prevent CPU offline

nghua Yu Cc: Andrew Morton Cc: "Eric W. Biederman" Cc: Thomas Gleixner Cc: linux-i...@vger.kernel.org Signed-off-by: Srivatsa S. Bhat --- arch/ia64/kernel/irq_ia64.c | 15 +++ arch/ia64/kernel/perfmon.c |8 +++- 2 files changed, 22 insertions(+), 1 deletion(-

[PATCH 40/45] powerpc, irq: Use GFP_ATOMIC allocations in atomic context

: Li Zhong Cc: linuxppc-...@lists.ozlabs.org Signed-off-by: Srivatsa S. Bhat --- arch/powerpc/kernel/irq.c |2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c index ea185e0..ca39bac 100644 --- a/arch/powerpc/kernel/irq.c

[PATCH 34/45] hexagon/smp: Use get/put_online_cpus_atomic() to prevent CPU offline

o Cc: Thomas Gleixner Cc: linux-hexa...@vger.kernel.org Signed-off-by: Srivatsa S. Bhat --- arch/hexagon/kernel/smp.c |3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/hexagon/kernel/smp.c b/arch/hexagon/kernel/smp.c index 0e364ca..30d4318 100644 --- a/arch/hexagon/kernel/smp.c +++ b

[PATCH 41/45] powerpc: Use get/put_online_cpus_atomic() to prevent CPU offline

hmidt Cc: Gleb Natapov Cc: Alexander Graf Cc: Rob Herring Cc: Grant Likely Cc: Kumar Gala Cc: Zhao Chenhui Cc: linuxppc-...@lists.ozlabs.org Cc: k...@vger.kernel.org Cc: kvm-...@vger.kernel.org Cc: oprofile-l...@lists.sf.net Cc: cbe-oss-...@lists.ozlabs.org Signed-off-by: Srivatsa S.

[PATCH 42/45] powerpc: Use get/put_online_cpus_atomic() to avoid false-positive warning

: Zhao Chenhui Cc: Thomas Gleixner Cc: linuxppc-...@lists.ozlabs.org Signed-off-by: Srivatsa S. Bhat --- arch/powerpc/kernel/smp.c |2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c index 2123bec..59c9a09 100644 --- a/arch/powerpc

[PATCH 38/45] MIPS: Use get/put_online_cpus_atomic() to prevent CPU offline

e Cc: David Daney Cc: Yong Zhang Cc: Thomas Gleixner Cc: Sanjay Lal Cc: "Steven J. Hill" Cc: John Crispin Cc: Florian Fainelli Cc: linux-m...@linux-mips.org Signed-off-by: Srivatsa S. Bhat --- arch/mips/kernel/cevt-smtc.c |7 +++ arch/mips/kernel/smp.c | 16 +++

[PATCH 30/45] x86/xen: Use get/put_online_cpus_atomic() to prevent CPU offline

Wilk Cc: Jeremy Fitzhardinge Cc: Thomas Gleixner Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: x...@kernel.org Cc: xen-de...@lists.xensource.com Cc: virtualizat...@lists.linux-foundation.org Signed-off-by: Srivatsa S. Bhat --- arch/x86/xen/mmu.c |9 +++-- 1 file changed, 7 i

[PATCH 37/45] m32r: Use get/put_online_cpus_atomic() to prevent CPU offline

a Cc: linux-m...@ml.linux-m32r.org Cc: linux-m32r...@ml.linux-m32r.org Signed-off-by: Srivatsa S. Bhat --- arch/m32r/kernel/smp.c | 16 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/arch/m32r/kernel/smp.c b/arch/m32r/kernel/smp.c index ce7aea3..ffafdba 100644

[PATCH 29/45] kvm/vmx: Use get/put_online_cpus_atomic() to prevent CPU offline

v Cc: Paolo Bonzini Cc: Thomas Gleixner Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: x...@kernel.org Cc: k...@vger.kernel.org Signed-off-by: Srivatsa S. Bhat --- arch/x86/kvm/vmx.c | 13 +++-- 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/arch/x86/kvm/vmx.c b/arc

[PATCH 26/45] x86: Use get/put_online_cpus_atomic() to prevent CPU offline

r Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: x...@kernel.org Cc: Tony Luck Cc: Borislav Petkov Cc: Konrad Rzeszutek Wilk Cc: Sebastian Andrzej Siewior Cc: Joerg Roedel Cc: Jan Beulich Cc: Joonsoo Kim Cc: linux-e...@vger.kernel.org Signed-off-by: Srivatsa S. Bhat --- arch/x86/kernel

[PATCH 28/45] KVM: Use get/put_online_cpus_atomic() to prevent CPU offline

v Cc: Paolo Bonzini Cc: k...@vger.kernel.org Signed-off-by: Srivatsa S. Bhat --- virt/kvm/kvm_main.c |8 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 302681c..5bbfa30 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_m

[PATCH 25/45] staging/octeon: Use get/put_online_cpus_atomic() to prevent CPU offline

n Cc: de...@driverdev.osuosl.org Signed-off-by: Srivatsa S. Bhat --- drivers/staging/octeon/ethernet-rx.c |3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/staging/octeon/ethernet-rx.c b/drivers/staging/octeon/ethernet-rx.c index 34afc16..8588b4d 100644 --- a/drivers/staging/o

[PATCH 23/45] infiniband: ehca: Use get/put_online_cpus_atomic() to prevent CPU offline

n Cc: Christoph Raisch Cc: Roland Dreier Cc: Sean Hefty Cc: Hal Rosenstock Cc: linux-r...@vger.kernel.org Signed-off-by: Srivatsa S. Bhat --- drivers/infiniband/hw/ehca/ehca_irq.c |5 + 1 file changed, 5 insertions(+) diff --git a/drivers/infiniband/hw/ehca/ehca_irq.c b/drivers/infin

[PATCH 24/45] [SCSI] fcoe: Use get/put_online_cpus_atomic() to prevent CPU offline

e Cc: "James E.J. Bottomley" Cc: de...@open-fcoe.org Cc: linux-s...@vger.kernel.org Signed-off-by: Srivatsa S. Bhat --- drivers/scsi/fcoe/fcoe.c |7 ++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c index 292b24f.

[PATCH 22/45] percpu_counter: Use get/put_online_cpus_atomic() to prevent CPU offline

ff-by: Srivatsa S. Bhat --- lib/percpu_counter.c |2 ++ 1 file changed, 2 insertions(+) diff --git a/lib/percpu_counter.c b/lib/percpu_counter.c index ba6085d..9cf9086 100644 --- a/lib/percpu_counter.c +++ b/lib/percpu_counter.c @@ -98,6 +98,7 @@ s64 __percpu_counter_sum(struct percpu_co

[PATCH 27/45] perf/x86: Use get/put_online_cpus_atomic() to prevent CPU offline

ras Cc: Ingo Molnar Cc: Arnaldo Carvalho de Melo Cc: Thomas Gleixner Cc: "H. Peter Anvin" Cc: x...@kernel.org Signed-off-by: Srivatsa S. Bhat --- arch/x86/kernel/cpu/perf_event_intel_uncore.c |6 ++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/kernel/cpu/perf_event_i

[PATCH 21/45] block: Use get/put_online_cpus_atomic() to prevent CPU offline

d-off-by: Srivatsa S. Bhat --- block/blk-softirq.c |3 +++ 1 file changed, 3 insertions(+) diff --git a/block/blk-softirq.c b/block/blk-softirq.c index 467c8de..bbab3d3 100644 --- a/block/blk-softirq.c +++ b/block/blk-softirq.c @@ -58,6 +58,7 @@ static void trigger_softirq(void

[PATCH 16/45] tick-broadcast: Use get/put_online_cpus_atomic() to prevent CPU offline

ixner Signed-off-by: Srivatsa S. Bhat --- kernel/time/tick-broadcast.c |8 1 file changed, 8 insertions(+) diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c index d66f554..53493a6 100644 --- a/kernel/time/tick-broadcast.c +++ b/kernel/time/tick-broadcast.c @@ -2

[PATCH 20/45] net: Use get/put_online_cpus_atomic() to prevent CPU offline

iller" Cc: Eric Dumazet Cc: Alexander Duyck Cc: Cong Wang Cc: Ben Hutchings Cc: net...@vger.kernel.org Signed-off-by: Srivatsa S. Bhat --- net/core/dev.c |9 +++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/net/core/dev.c b/net/core/dev.c index fc1e289..90519

[PATCH 19/45] irq: Use get/put_online_cpus_atomic() to prevent CPU offline

ixner Signed-off-by: Srivatsa S. Bhat --- kernel/irq/manage.c |7 +++ kernel/irq/proc.c |3 +++ 2 files changed, 10 insertions(+) diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index e16caa8..4d89f19 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -18,6

[PATCH 17/45] time/clocksource: Use get/put_online_cpus_atomic() to prevent CPU offline

z Cc: Thomas Gleixner Signed-off-by: Srivatsa S. Bhat --- kernel/time/clocksource.c |5 + 1 file changed, 5 insertions(+) diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c index e713ef7..c4bbc25 100644 --- a/kernel/time/clocksource.c +++ b/kernel/time/clocksource.c @@ -30,6

[PATCH 18/45] softirq: Use get/put_online_cpus_atomic() to prevent CPU offline

ecker Cc: Thomas Gleixner Cc: Andrew Morton Cc: Sedat Dilek Cc: "Paul E. McKenney" Signed-off-by: Srivatsa S. Bhat --- kernel/softirq.c |3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/softirq.c b/kernel/softirq.c index 3d6833f..c289722 100644 --- a/kernel/softirq

[PATCH 12/45] sched/fair: Use get/put_online_cpus_atomic() to prevent CPU offline

Peter Zijlstra Signed-off-by: Srivatsa S. Bhat --- kernel/sched/fair.c | 14 +- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index c0ac2c3..88f056e 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -3338,7 +3

[PATCH 13/45] timer: Use get/put_online_cpus_atomic() to prevent CPU offline

ixner Signed-off-by: Srivatsa S. Bhat --- kernel/timer.c |4 1 file changed, 4 insertions(+) diff --git a/kernel/timer.c b/kernel/timer.c index 15ffdb3..5db594c 100644 --- a/kernel/timer.c +++ b/kernel/timer.c @@ -729,6 +729,7 @@ __mod_timer(struct timer_list *timer, unsigned long ex

[PATCH 11/45] migration: Use raw_spin_lock/unlock since interrupts are already disabled

We need not use the raw_spin_lock_irqsave/restore primitives because all CPU_DYING notifiers run with interrupts disabled. So just use raw_spin_lock/unlock. Cc: Ingo Molnar Cc: Peter Zijlstra Signed-off-by: Srivatsa S. Bhat --- kernel/sched/core.c |4 ++-- 1 file changed, 2 insertions

[PATCH 10/45] sched/core: Use get/put_online_cpus_atomic() to prevent CPU offline

Peter Zijlstra Signed-off-by: Srivatsa S. Bhat --- kernel/sched/core.c | 23 +-- 1 file changed, 21 insertions(+), 2 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 195658b..accd550 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -11

[PATCH 14/45] sched/rt: Use get/put_online_cpus_atomic() to prevent CPU offline

Peter Zijlstra Signed-off-by: Srivatsa S. Bhat --- kernel/sched/rt.c | 14 ++ 1 file changed, 14 insertions(+) diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index 01970c8..03d9f38 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -6,6 +6,7 @@ #include &qu

[PATCH 09/45] smp: Use get/put_online_cpus_atomic() to prevent CPU offline

n Cc: Wang YanQing Cc: Shaohua Li Cc: Jan Beulich Cc: liguang Signed-off-by: Srivatsa S. Bhat --- kernel/smp.c | 52 ++-- 1 file changed, 30 insertions(+), 22 deletions(-) diff --git a/kernel/smp.c b/kernel/smp.c index 4dba0f7..1f36d6d 100644

[PATCH 15/45] rcu: Use get/put_online_cpus_atomic() to prevent CPU offline

tomic() APIs to prevent CPUs from going offline, while invoking from atomic context. Cc: Dipankar Sarma Cc: "Paul E. McKenney" Signed-off-by: Srivatsa S. Bhat --- kernel/rcutree.c |4 1 file changed, 4 insertions(+) diff --git a/kernel/rcutree.c b/kernel/rcutree.c index c

[PATCH 08/45] CPU hotplug: Convert preprocessor macros to static inline functions

Convert the macros in the CPU hotplug code to static inline C functions. Cc: Thomas Gleixner Cc: Andrew Morton Cc: Tejun Heo Cc: "Rafael J. Wysocki" Signed-off-by: Srivatsa S. Bhat --- include/linux/cpu.h |9 + 1 file changed, 5 insertions(+), 4 deletions(-) di

[PATCH 06/45] CPU hotplug: Sprinkle debugging checks to catch locking bugs

Morton Cc: Joonsoo Kim Signed-off-by: Srivatsa S. Bhat --- include/linux/cpumask.h | 47 +-- lib/cpumask.c |8 2 files changed, 53 insertions(+), 2 deletions(-) diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h

[PATCH 07/45] CPU hotplug: Expose the new debug config option

Now that we have all the pieces of the CPU hotplug debug infrastructure in place, expose the feature by growing a new Kconfig option, CONFIG_DEBUG_HOTPLUG_CPU. Cc: Andrew Morton Cc: "Paul E. McKenney" Cc: Akinobu Mita Cc: Catalin Marinas Cc: Michel Lespinasse Signed-off-by: Srivat

[PATCH 05/45] CPU hotplug: Protect set_cpu_online() to avoid false-positives

Gleixner Cc: Andrew Morton Cc: Yasuaki Ishimatsu Cc: "Rafael J. Wysocki" Signed-off-by: Srivatsa S. Bhat --- kernel/cpu.c |4 1 file changed, 4 insertions(+) diff --git a/kernel/cpu.c b/kernel/cpu.c index e90d9d7..23df9ba 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -818,

[PATCH 04/45] CPU hotplug: Add infrastructure to check lacking hotplug synchronization

Gleixner Cc: Andrew Morton Cc: Yasuaki Ishimatsu Cc: "Rafael J. Wysocki" Signed-off-by: Srivatsa S. Bhat --- include/linux/cpumask.h | 12 kernel/cpu.c| 75 +++ 2 files changed, 87 insertions(+) diff --git a/inc

[PATCH 00/45] CPU hotplug: stop_machine()-free CPU hotplug, part 1

19/ v5: http://lwn.net/Articles/533553/ v4: https://lkml.org/lkml/2012/12/11/209 v3: https://lkml.org/lkml/2012/12/7/287 v2: https://lkml.org/lkml/2012/12/5/322 v1: https://lkml.org/lkml/2012/12/4/88 -- Srivatsa S. Bhat (45): CPU hotplug: Provide APIs to prevent CPU offline from

[PATCH 02/45] CPU hotplug: Clarify the usage of different synchronization APIs

: Yasuaki Ishimatsu Cc: "Rafael J. Wysocki" Signed-off-by: Srivatsa S. Bhat --- kernel/cpu.c |7 +++ 1 file changed, 7 insertions(+) diff --git a/kernel/cpu.c b/kernel/cpu.c index 2d03398..860f51a 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -139,6 +139,13 @@ s

[PATCH 03/45] Documentation, CPU hotplug: Recommend usage of get/put_online_cpus_atomic()

from atomic context. Cc: Rob Landley Cc: linux-...@vger.kernel.org Signed-off-by: Srivatsa S. Bhat --- Documentation/cpu-hotplug.txt | 20 ++-- 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/Documentation/cpu-hotplug.txt b/Documentation/cpu-hotplug.txt index 9f

Re: [RFC PATCH v2 00/15][Sorted-buddy] mm: Memory Power Management

On 05/29/2013 01:38 AM, Phillip Susi wrote: > > On 4/19/2013 3:12 AM, Srivatsa S. Bhat wrote: >> But going further, as I had mentioned in my TODO list, we can be >> smarter than this while doing compaction to evacuate memory regions >> - we can choose to migrate only the

Re: [RFC PATCH 6/8] kthread: Enable parking requests from setup() and unpark() callbacks

On 05/21/2013 02:28 PM, anish singh wrote: > On Tue, May 21, 2013 at 1:19 PM, Srivatsa S. Bhat > wrote: >> On 05/21/2013 11:04 AM, anish singh wrote: >>> On Mon, May 20, 2013 at 9:31 PM, Frederic Weisbecker >>> wrote: >>>> When the watchdog code

Re: [RFC PATCH 6/8] kthread: Enable parking requests from setup() and unpark() callbacks

thread get back in action > after the schedule call.Then sysctl and procfs will work I think. kthread_unpark() can wake up a task only if the task is in TASK_PARKED state. But since the above task would be in TASK_INTERRUPTIBLE state (since it is not parked), kthread_unpark() will be powerles

Re: [RFC PATCH 6/8] kthread: Enable parking requests from setup() and unpark() callbacks

because immediately after coming out of the parked state, the 'continue' statement helps re-evaluate the stop/park condition. So this fix is only for the ->setup() case. > callbacks look like proper way to implement cancellation in > general. So let's fix it that way. >

Re: [RFC PATCH nohz] return NOTIFY_BAD in cpu down call back to stop offlining the cpu

ak; > then the cpu > would be taken down with part of the DOWN_PREPARE notifier callbacks > called, and something bad could happen after that. > > Signed-off-by: Li Zhong > --- Reviewed-by: Srivatsa S. Bhat > kernel/time/tick-sched.c |2 +- > 1 files changed, 1 ins

Re: NOHZ: WARNING: at arch/x86/kernel/smp.c:123 native_smp_send_reschedule, round 2

be triggered via sysfs also, but it would be good to get a confirmation.] And Viresh, in the regular hotplug paths, the call to gov_cancel_work() is supposed to kill any pending workqueue functions pertaining to offline CPUs right? Could there be a synchronization bug somewhere due to which this might not be happening properly? Regards, Srivatsa S. Bhat -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/

Re: Performance issue since 3.2.6

On 05/18/2013 05:21 AM, Rafael J. Wysocki wrote: > On Saturday, May 18, 2013 01:20:10 AM Srivatsa S. Bhat wrote: >> On 05/17/2013 11:47 PM, Olivier Doucet wrote: >>> Hello, >>> >>> This performance penalty is still present in kernel 3.9.2. And >>> CONFI

Re: Performance issue since 3.2.6

- use the interfaces provided by the kernel to fix your problem: - you can give idle=poll in the kernel command line, - OR you can echo 0 > /dev/cpu_dma_latency Irrespective of your kernel configuration options (CONFIG_PM=y/n), the CPUs will not enter deep idle states, giving you th

Re: [PATCH] parisc: avoid WARNING: at kernel/cpu/idle.c:96

@@ -56,6 +56,7 @@ void __weak arch_cpu_idle_dead(void) { } > void __weak arch_cpu_idle(void) > { > cpu_idle_force_poll = 1; > + local_irq_enable(); > } > > /* > This patch looks like the correct fix to me. Reviewed-by: Srivatsa S. Bhat Regards, Srivatsa S. Bha

Re: [PATCH] cpu remove CONFIG_INIT_ALL_POSSIBLE check

config INIT_ALL_POSSIBLE Regards, Srivatsa S. Bhat > Signed-off-by: liguang > --- > kernel/cpu.c |5 - > 1 files changed, 0 insertions(+), 5 deletions(-) > > diff --git a/kernel/cpu.c b/kernel/cpu.c > index cd166d3..2697d1a 100644 > --- a/kernel/cpu.c > +++ b

[tip:core/urgent] rcu/idle: Wrap cpu-idle poll mode within rcu_idle_enter/exit

Commit-ID: b47430d3adbedbfdb5979ba4874f5dadf94f16b1 Gitweb: http://git.kernel.org/tip/b47430d3adbedbfdb5979ba4874f5dadf94f16b1 Author: Srivatsa S. Bhat AuthorDate: Tue, 14 May 2013 04:01:27 +0530 Committer: Thomas Gleixner CommitDate: Tue, 14 May 2013 17:43:29 +0200 rcu/idle: Wrap cpu

Re: [v3.10-rc1] WARNING: at kernel/rcutree.c:502

On 05/14/2013 01:50 PM, Bjørn Mork wrote: > "Srivatsa S. Bhat" writes: >> On 05/14/2013 01:08 PM, Bjørn Mork wrote: >>> "Srivatsa S. Bhat" writes: >>> >>>> The problem appears to be in the cpu idle poll implementation. You can >&g

Re: [v3.10-rc1] WARNING: at kernel/rcutree.c:502

On 05/14/2013 01:16 PM, Srivatsa S. Bhat wrote: > On 05/14/2013 01:08 PM, Bjørn Mork wrote: >> "Srivatsa S. Bhat" writes: >>> On 05/13/2013 08:09 PM, Bjørn Mork wrote: >>> >>>> Hey, hey, hey. Turns out this wasn't that wrong after all.

Re: [v3.10-rc1] WARNING: at kernel/rcutree.c:502

On 05/14/2013 01:08 PM, Bjørn Mork wrote: > "Srivatsa S. Bhat" writes: >> On 05/13/2013 08:09 PM, Bjørn Mork wrote: >> >>> Hey, hey, hey. Turns out this wasn't that wrong after all. That merge >>> includes a oneline diff in kernel/cpu/idle.c and

Re: [v3.10-rc1] WARNING: at kernel/rcutree.c:502

explain the patch properly, so I think I need some help from > Thomas here. Unless this makes you understand the real issue? > > Thomas, why does powertop trigger the > > WARNING: at kernel/rcutree.c:502 rcu_eqs_exit_common.isra.48+0x3d/0x125() > > without the attached patc

Re: [linux-pm] [PATCH] cpuidle: don't wakeup processor when set a longer latency

On 05/13/2013 08:55 PM, Daniel Lezcano wrote: > On 05/13/2013 11:04 AM, Srivatsa S. Bhat wrote: >> On 05/13/2013 12:22 PM, Lianwei Wang wrote: >>> Thank you. Patch is updated. >>> >>> From 2d0b4afb5461847dcdf08a87b02015d061b12e85 Mon Sep 17 00:00:00 2001 >&

Re: [linux-pm] [PATCH] cpuidle: don't wakeup processor when set a longer latency

dder cpu idle governors, the value set in cpu_dma_latency is used to compare with the *exit-latency* of the sleep state in order to decide which sleep state to go to. IOW, it has got *nothing* to do with the duration of the sleep!! > + if ((long)l < (long)s) { ... and hence, th

Re: [PATCH -v8 01/11] CPU hotplug: Provide a generic helper to disable/enable CPU hotplug

that what I have now is simply wrong for Robin's >> application. Robin, can you please check this? We probably want to >> make the does-something version of cpu_hotplug_disable/enable available >> if CONFIG_HOTPLUG_CPU. > > This patch came from "Srivatsa S. B

Re: 3.9.0: WARNING: at drivers/base/core.c:575

On 05/09/2013 04:15 PM, Benjamin Herrenschmidt wrote: > On Thu, 2013-05-09 at 16:03 +0530, Srivatsa S. Bhat wrote: >> Can you check if the patch posted here fixes it? >> >> http://marc.info/?l=linux-kernel&m=136791823608013&w=2 > > I believe I've alre

Re: 3.9.0: WARNING: at drivers/base/core.c:575

On 05/07/2013 12:55 PM, CAI Qian wrote: > Never saw any of those messages were floating in any of the RC testing, but > now happened in 3.9 GA on Power 7 systems. > Can you check if the patch posted here fixes it? http://marc.info/?l=linux-kernel&m=136791823608013&w=2 Regards,

[PATCH] powerpc, cpu hotplug: Fix warning on boot regarding sysfs file permission

So remove the bogus write permission to fix the warning. Reported-by: CAI Qian Signed-off-by: Srivatsa S. Bhat --- arch/powerpc/kernel/sysfs.c |2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c index 3ce1f86..e68a84

Re: 3.9.0: WARNING: at drivers/base/core.c:575

1b > [ 18.402308] ---[ end trace 3eb6a6f51fb8cafb ]--- > [ 18.402406] [ cut here ] > For the x86-64 case, does the patch posted here fix the issue? http://marc.info/?l=linux-edac&m=136731542432210&w=2 Regards, Srivatsa S. Bhat -- To unsubscrib

[PATCH] edac: Don't give write permission to read-only file

ion to get rid of the warning. Signed-off-by: Srivatsa S. Bhat --- drivers/edac/edac_mc_sysfs.c | 12 ++-- 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c index 5899a76..769d92e 100644 --- a/drivers/edac/edac_mc_

Re: [PATCH] Msleep_interruptible() on a dual processor system may wait a long time.

gt; /* Any cleanup work */ > printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus()); > smp_cpus_done(setup_max_cpus); > So you moved cpu_notify(CPU_ONLINE) from cpu_up() to the SMP boot-up code. That means, after boot, you'll never be a

Re: [PATCH] cpu: rid cpu_hotplug_disabled check for cpu_down()

On 04/29/2013 10:12 AM, li guang wrote: > 在 2013-04-29一的 10:00 +0530，Srivatsa S. Bhat写道： >> On 04/29/2013 08:19 AM, liguang wrote: >>> in cpu_down(), _cpu_down() will do >>> " >>> if (num_online_cpus() == 1) >>> return -

Re: [PATCH] cpu: rid cpu_hotplug_disabled check for cpu_down()

sons. One such case is suspend/resume. That's why, if you have noticed, the suspend/resume code invokes the _cpu_down() version, in order to bypass the flag and get its job done. So, no, I think the check needs to stay. Regards, Srivatsa S. Bhat > Signed-off-by: liguang > --- > kern

Re: [RFC PATCH v2 00/15][Sorted-buddy] mm: Memory Power Management

On 04/18/2013 10:40 PM, Dave Hansen wrote: > On 04/09/2013 02:45 PM, Srivatsa S. Bhat wrote: >> 2. Performance overhead is expected to be low: Since we retain the simplicity >>of the algorithm in the page allocation path, page allocation can >>potentially remain a

Re: [PATCH] idle: fix hlt/nohlt command-line handling in new generic idle

Rusty Russell > Cc: Paul McKenney > Cc: Peter Zijlstra > Cc: Srivatsa S. Bhat > Cc: Magnus Damm > Signed-off-by: Kevin Hilman > --- Reviewed-by: Srivatsa S. Bhat Regards, Srivatsa S. Bhat > Applies on tip/smp/hotplug where generic idle feature is added > > arch/Kcon

Re: [Patch -v4 1/4] Migrate shutdown/reboot to boot cpu.

;t offline CPU0 if any PIC irq can not be migrated out of it 80aa1df x86, Kconfig: Add config switch for CPU0 hotplug f78cff4 doc: Add x86 CPU0 online/offline feature Regards, Srivatsa S. Bhat -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body o

Re: [RFC PATCH v2 00/15][Sorted-buddy] mm: Memory Power Management

On 04/18/2013 08:43 PM, Srinivas Pandruvada wrote: > On 04/18/2013 02:54 AM, Srivatsa S. Bhat wrote: >> On 04/17/2013 10:23 PM, Srinivas Pandruvada wrote: >>> On 04/09/2013 02:45 PM, Srivatsa S. Bhat wrote: >>>> [I know, this cover letter is a little too long

Re: [RFC PATCH v2 00/15][Sorted-buddy] mm: Memory Power Management

On 04/19/2013 11:04 AM, Simon Jeons wrote: > Hi Srivatsa, > On 04/10/2013 05:45 AM, Srivatsa S. Bhat wrote: >> [I know, this cover letter is a little too long, but I wanted to clearly >> explain the overall goals and the high-level design of this patchset in >> detail. I h

Re: [RFC PATCH v2 00/15][Sorted-buddy] mm: Memory Power Management

On 04/18/2013 10:40 PM, Dave Hansen wrote: > On 04/09/2013 02:45 PM, Srivatsa S. Bhat wrote: >> 2. Performance overhead is expected to be low: Since we retain the simplicity >>of the algorithm in the page allocation path, page allocation can >>potentially remain a

Re: [RFC PATCH v2 00/15][Sorted-buddy] mm: Memory Power Management

On 04/17/2013 10:23 PM, Srinivas Pandruvada wrote: > On 04/09/2013 02:45 PM, Srivatsa S. Bhat wrote: >> [I know, this cover letter is a little too long, but I wanted to clearly >> explain the overall goals and the high-level design of this patchset in >> detail. I hope th

Re: [Patch -v4 1/4] Migrate shutdown/reboot to boot cpu.

On 04/17/2013 03:33 PM, Robin Holt wrote: > On Wed, Apr 17, 2013 at 09:48:35AM +0200, Ingo Molnar wrote: >> >> * Robin Holt wrote: >> >>> On Tue, Apr 16, 2013 at 09:18:07PM +0530, Srivatsa S. Bhat wrote: >>>> On 04/16/2013 05:36 PM, Robin Holt wrote: >

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