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Subject[PATCH v2 0/7] Enable queued rwlock and queued spinlock for SPARC
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This series of patches enables queued rwlock and queued spinlock support
for SPARC. These features were introduced some time ago in upstream.
Here are some of the earlier discussions.
https://lwn.net/Articles/572765/
https://lwn.net/Articles/582200/
https://lwn.net/Articles/561775/
https://lwn.net/Articles/590243/

Tests: Ran AIM7 benchmark to verify the performance on various workloads.
https://github.com/davidlohr/areaim. Same benchmark was used when this
feature was introduced and enabled on x86. Here are the test results.

Kernel 4.11.0-rc6 4.11.0-rc6 + Change
baseline queued locks
(Avg No.of jobs) (Avg No.of jobs)
Workload
High systime 10-100 user 17290.48 17295.18 +0.02
High systime 200-1000 users 109814.95 110248.87 +0.39
High systime 1200-2000 users 107912.40 127923.16 +18.54

Disk IO 10-100 users 168910.16 158834.17 -5.96
Disk IO 200-1000 users 242781.74 281285.80 +15.85
Disk IO 1200-2000 users 228518.23 218421.23 -4.41

Disk IO 10-100 users 183933.77 207928.67 +13.04
Disk IO 200-1000 users 491981.56 500162.33 +1.66
Disk IO 1200-2000 users 463395.66 467312.70 +0.84

fserver 10-100 users 254177.53 270283.08 +6.33
fserver IO 200-1000 users 269017.35 324812.2 +20.74
fserver IO 1200-2000 users 229538.87 284713.77 +24.03

Disk I/O results are little bit in negative territory. But majority of the
performance changes are in positive and it is significant in some cases.

Changes:
v1->v2:
Addressed the comments from David Miller.
1. Added CPU_BIG_ENDIAN for all SPARC
2. Removed #ifndef __LINUX_SPINLOCK_TYPES_H guard from spinlock_types.h
3. Removed check for CONFIG_QUEUED_RWLOCKS in SPARC64 as it is the
default definition for SPARC64 now. Cleaned-up the previous arch_read_xxx
and arch_write_xxx definitions as it is defined now in qrwlock.h.
4. Removed check for CONFIG_QUEUED_SPINLOCKS in SPARC64 as it is the default
definition now for SPARC64 now. Cleaned-up the previous arch_spin_xxx
definitions as it is defined in qspinlock.h.

v1: Initial version

Babu Moger (7):
kernel/locking: Fix compile error with qrwlock.c
arch/sparc: Remove the check #ifndef __LINUX_SPINLOCK_TYPES_H
arch/sparc: Define config parameter CPU_BIG_ENDIAN
arch/sparc: Introduce cmpxchg_u8 SPARC
arch/sparc: Enable queued rwlocks for SPARC
arch/sparc: Introduce xchg16 for SPARC
arch/sparc: Enable queued spinlock support for SPARC

arch/sparc/Kconfig | 6 +
arch/sparc/include/asm/cmpxchg_64.h | 76 ++++++++++--
arch/sparc/include/asm/qrwlock.h | 7 +
arch/sparc/include/asm/qspinlock.h | 7 +
arch/sparc/include/asm/spinlock_64.h | 208 +------------------------------
arch/sparc/include/asm/spinlock_types.h | 12 ++-
include/asm-generic/qrwlock_types.h | 6 +-
kernel/locking/qrwlock.c | 1 +
8 files changed, 101 insertions(+), 222 deletions(-)
create mode 100644 arch/sparc/include/asm/qrwlock.h
create mode 100644 arch/sparc/include/asm/qspinlock.h

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