search for: arch_use_queued_spinlock

...s/Kconfig > index bec90fb..8a87d06 100644 > --- a/arch/powerpc/platforms/pseries/Kconfig > +++ b/arch/powerpc/platforms/pseries/Kconfig Why here? Not arch/powerpc/platforms/Kconfig? > @@ -23,6 +23,14 @@ config PPC_PSERIES > select PPC_DOORBELL > default y > > +config ARCH_USE_QUEUED_SPINLOCKS > + default y > + bool "Enable qspinlock" I think you just enable qspinlock by default for all PPC platforms. I guess you need to put depends on PPC_PSERIES || PPC_POWERNV here to achieve what you mean in you commit message. Regards, Boqun > + help > + Enabling this o...

...s/Kconfig > index bec90fb..8a87d06 100644 > --- a/arch/powerpc/platforms/pseries/Kconfig > +++ b/arch/powerpc/platforms/pseries/Kconfig Why here? Not arch/powerpc/platforms/Kconfig? > @@ -23,6 +23,14 @@ config PPC_PSERIES > select PPC_DOORBELL > default y > > +config ARCH_USE_QUEUED_SPINLOCKS > + default y > + bool "Enable qspinlock" I think you just enable qspinlock by default for all PPC platforms. I guess you need to put depends on PPC_PSERIES || PPC_POWERNV here to achieve what you mean in you commit message. Regards, Boqun > + help > + Enabling this o...

...(+) diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig index bec90fb..8a87d06 100644 --- a/arch/powerpc/platforms/pseries/Kconfig +++ b/arch/powerpc/platforms/pseries/Kconfig @@ -23,6 +23,14 @@ config PPC_PSERIES select PPC_DOORBELL default y +config ARCH_USE_QUEUED_SPINLOCKS + default y + bool "Enable qspinlock" + help + Enabling this option will let kernel use qspinlock which is a kind of + fairlock. It has shown a good performance improvement on x86 and also ppc + especially in high contention cases. + config PPC_SPLPAR depends on PPC_PSERIES b...

...00644 >> --- a/arch/powerpc/platforms/pseries/Kconfig >> +++ b/arch/powerpc/platforms/pseries/Kconfig > > Why here? Not arch/powerpc/platforms/Kconfig? > >> @@ -23,6 +23,14 @@ config PPC_PSERIES >> select PPC_DOORBELL >> default y >> >> +config ARCH_USE_QUEUED_SPINLOCKS >> + default y >> + bool "Enable qspinlock" > > I think you just enable qspinlock by default for all PPC platforms. I > guess you need to put > > depends on PPC_PSERIES || PPC_POWERNV > > here to achieve what you mean in you commit message. > yes, ano...

...dex 9fa23eb320ff..b17575109876 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -145,6 +145,8 @@ config PPC select ARCH_SUPPORTS_ATOMIC_RMW select ARCH_USE_BUILTIN_BSWAP select ARCH_USE_CMPXCHG_LOCKREF if PPC64 + select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS + select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS select ARCH_WANT_IPC_PARSE_VERSION select ARCH_WEAK_RELEASE_ACQUIRE select BINFMT_ELF @@ -490,6 +492,17 @@ config HOTPLUG_CPU Say N if you are unsure. +config PPC_QUEUED_SPINLOCKS + bool "Queued spinlocks" + depends on SMP + default "y" if...

...dex 24ac85c868db..17663ea57697 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -146,6 +146,8 @@ config PPC select ARCH_SUPPORTS_ATOMIC_RMW select ARCH_USE_BUILTIN_BSWAP select ARCH_USE_CMPXCHG_LOCKREF if PPC64 + select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS + select ARCH_USE_QUEUED_SPINLOCKS if PPC_QUEUED_SPINLOCKS select ARCH_WANT_IPC_PARSE_VERSION select ARCH_WEAK_RELEASE_ACQUIRE select BINFMT_ELF @@ -492,6 +494,17 @@ config HOTPLUG_CPU Say N if you are unsure. +config PPC_QUEUED_SPINLOCKS + bool "Queued spinlocks" + depends on SMP + default "y" if...

Hi All, this is the fairlock patchset. You can apply them and build successfully. patches are based on linux-next qspinlock can avoid waiter starved issue. It has about the same speed in single-thread and it can be much faster in high contention situations especially when the spinlock is embedded within the data structure to be protected. v7 -> v8: add one patch to drop a function call

Hi All, this is the fairlock patchset. You can apply them and build successfully. patches are based on linux-next qspinlock can avoid waiter starved issue. It has about the same speed in single-thread and it can be much faster in high contention situations especially when the spinlock is embedded within the data structure to be protected. v7 -> v8: add one patch to drop a function call

From: Pan Xinhui <xinhui.pan at linux.vnet.ibm.com> This patch aims to enable qspinlock on PPC. And on pseries platform, it also support paravirt qspinlock. Signed-off-by: Pan Xinhui <xinhui.pan at linux.vnet.ibm.com> --- arch/powerpc/include/asm/qspinlock.h | 37 +++++++++++++++ arch/powerpc/include/asm/qspinlock_paravirt.h | 36 +++++++++++++++

From: Pan Xinhui <xinhui.pan at linux.vnet.ibm.com> This patch aims to enable qspinlock on PPC. And on pseries platform, it also support paravirt qspinlock. Signed-off-by: Pan Xinhui <xinhui.pan at linux.vnet.ibm.com> --- arch/powerpc/include/asm/qspinlock.h | 37 +++++++++++++++ arch/powerpc/include/asm/qspinlock_paravirt.h | 36 +++++++++++++++

change fome v1: separate into 6 pathes from one patch some minor code changes. benchmark test results are below. run 3 tests on pseries IBM,8408-E8E with 32cpus, 64GB memory perf bench futex hash perf bench futex lock-pi perf record -advRT || perf bench sched messaging -g 1000 || perf report summary: _____test________________spinlcok______________pv-qspinlcok_____ |futex hash | 556370 ops |

change fome v1: separate into 6 pathes from one patch some minor code changes. benchmark test results are below. run 3 tests on pseries IBM,8408-E8E with 32cpus, 64GB memory perf bench futex hash perf bench futex lock-pi perf record -advRT || perf bench sched messaging -g 1000 || perf report summary: _____test________________spinlcok______________pv-qspinlcok_____ |futex hash | 556370 ops |

change from v2: __spin_yeild_cpu() will yield slices to lpar if target cpu is running. remove unnecessary rmb() in __spin_yield/wake_cpu. __pv_wait() will check the *ptr == val. some commit message change change fome v1: separate into 6 pathes from one patch some minor code changes. I do several tests on pseries IBM,8408-E8E with 32cpus, 64GB memory. benchmark test results are below. 2

change from v2: __spin_yeild_cpu() will yield slices to lpar if target cpu is running. remove unnecessary rmb() in __spin_yield/wake_cpu. __pv_wait() will check the *ptr == val. some commit message change change fome v1: separate into 6 pathes from one patch some minor code changes. I do several tests on pseries IBM,8408-E8E with 32cpus, 64GB memory. benchmark test results are below. 2

change from v4: BUG FIX. thanks boqun reporting this issue. struct __qspinlock has different layout in bigendian mahcine. native_queued_spin_unlock() may write value to a wrong address. now fix it. sorry for not even doing a test on bigendian machine before!!! change from v3: a big change in [PATCH v4 4/6] pv-qspinlock: powerpc support pv-qspinlock no other patch changed. and the patch

change from v4: BUG FIX. thanks boqun reporting this issue. struct __qspinlock has different layout in bigendian mahcine. native_queued_spin_unlock() may write value to a wrong address. now fix it. sorry for not even doing a test on bigendian machine before!!! change from v3: a big change in [PATCH v4 4/6] pv-qspinlock: powerpc support pv-qspinlock no other patch changed. and the patch

From: root <root at ltcalpine2-lp13.aus.stglabs.ibm.com> change from v4: BUG FIX. thanks boqun reporting this issue. struct __qspinlock has different layout in bigendian mahcine. native_queued_spin_unlock() may write value to a wrong address. now fix it. change from v3: a big change in [PATCH v4 4/6] pv-qspinlock: powerpc support pv-qspinlock no other patch changed. and the patch

From: root <root at ltcalpine2-lp13.aus.stglabs.ibm.com> change from v4: BUG FIX. thanks boqun reporting this issue. struct __qspinlock has different layout in bigendian mahcine. native_queued_spin_unlock() may write value to a wrong address. now fix it. change from v3: a big change in [PATCH v4 4/6] pv-qspinlock: powerpc support pv-qspinlock no other patch changed. and the patch

Hi All, this is the fairlock patchset. You can apply them and build successfully. patches are based on linux-next qspinlock can avoid waiter starved issue. It has about the same speed in single-thread and it can be much faster in high contention situations especially when the spinlock is embedded within the data structure to be protected. v8 -> v9: mv qspinlocm config entry to

Hi All, this is the fairlock patchset. You can apply them and build successfully. patches are based on linux-next qspinlock can avoid waiter starved issue. It has about the same speed in single-thread and it can be much faster in high contention situations especially when the spinlock is embedded within the data structure to be protected. v8 -> v9: mv qspinlocm config entry to