linux-kernel - [PATCH v3 0/6] powerpc use pv-qpsinlock as the default spinlock implemention

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Date:	Wed, 25 May 2016 16:18:03 +0800
From:	Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	virtualization@...ts.linux-foundation.org
Cc:	benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
	peterz@...radead.org, mingo@...hat.com, paulmck@...ux.vnet.ibm.com,
	jeremy@...p.org, chrisw@...s-sol.org, akataria@...are.com,
	rusty@...tcorp.com.au, Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>
Subject: [PATCH v3 0/6]  powerpc use pv-qpsinlock as the default spinlock implemention

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 perf tests:
perf bench futex hash
perf bench futex lock-pi

_____test________________spinlcok______________pv-qspinlcok_____
|futex hash	|	556370 ops	|	629634 ops	|
|futex lock-pi	|	362 ops		|	367 ops		|

scheduler test:
Test how many loops of schedule() can finish within 10 seconds on all cpus.

_____test________________spinlcok______________pv-qspinlcok_____
|schedule() loops|	322811921 	|	311449290	|

kernel compiling test:
build a linux kernel image to see how long it took

_____test________________spinlcok______________pv-qspinlcok_____
| compiling takes|	22m 		|	22m		|

Pan Xinhui (6):
  qspinlock: powerpc support qspinlock
  powerpc: pseries/Kconfig: Add qspinlock build config
  powerpc: lib/locks.c: Add cpu yield/wake helper function
  pv-qspinlock: powerpc support pv-qspinlock
  pv-qspinlock: use cmpxchg_release in __pv_queued_spin_unlock
  powerpc: pseries: Add pv-qspinlock build config/make

 arch/powerpc/include/asm/qspinlock.h               | 39 +++++++++++++++++++
 arch/powerpc/include/asm/qspinlock_paravirt.h      | 38 ++++++++++++++++++
 .../powerpc/include/asm/qspinlock_paravirt_types.h | 13 +++++++
 arch/powerpc/include/asm/spinlock.h                | 31 +++++++++------
 arch/powerpc/include/asm/spinlock_types.h          |  4 ++
 arch/powerpc/kernel/Makefile                       |  1 +
 arch/powerpc/kernel/paravirt.c                     | 45 ++++++++++++++++++++++
 arch/powerpc/lib/locks.c                           | 37 ++++++++++++++++++
 arch/powerpc/platforms/pseries/Kconfig             |  9 +++++
 arch/powerpc/platforms/pseries/setup.c             |  5 +++
 kernel/locking/qspinlock_paravirt.h                |  2 +-
 11 files changed, 211 insertions(+), 13 deletions(-)
 create mode 100644 arch/powerpc/include/asm/qspinlock.h
 create mode 100644 arch/powerpc/include/asm/qspinlock_paravirt.h
 create mode 100644 arch/powerpc/include/asm/qspinlock_paravirt_types.h
 create mode 100644 arch/powerpc/kernel/paravirt.c

-- 
1.9.1