linux-kernel - [PATCH v3 0/7] Enable queued rwlock and queued spinlock for SPARC

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Message-Id: <1495575958-1022566-1-git-send-email-babu.moger@oracle.com>
Date:   Tue, 23 May 2017 15:45:51 -0600
From:   Babu Moger <babu.moger@...cle.com>
To:     davem@...emloft.net, peterz@...radead.org, mingo@...hat.com,
        arnd@...db.de
Cc:     babu.moger@...cle.com, shannon.nelson@...cle.com,
        haakon.bugge@...cle.com, steven.sistare@...cle.com,
        vijay.ac.kumar@...cle.com, jane.chu@...cle.com,
        sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: [PATCH v3 0/7] Enable queued rwlock and queued spinlock for SPARC

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:
v2 -> v3:
 1. Rebased the patches on top of 4.12-rc2.
 2. Re-ordered the patch #1 and patch #2. That is the same order I have seen 
    the issues. So, it should be addressed in the same order. Patch #1 removes
    the check __LINUX_SPINLOCK_TYPES_H. Patch #2 addreses the compile error
    with qrwlock.c. This addresses the comments from Dave Miller on v2.

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):
  arch/sparc: Remove the check #ifndef __LINUX_SPINLOCK_TYPES_H
  kernel/locking: Fix compile error with qrwlock.c
  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 ++-
 kernel/locking/qrwlock.c                |    1 +
 7 files changed, 98 insertions(+), 219 deletions(-)
 create mode 100644 arch/sparc/include/asm/qrwlock.h
 create mode 100644 arch/sparc/include/asm/qspinlock.h