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author | Anton Blanchard <anton@samba.org> | 2010-02-10 00:57:28 +0000 |
---|---|---|
committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-02-17 14:03:14 +1100 |
commit | 4e14a4d17a8cd66ccab180d32c977091922cfbed (patch) | |
tree | 5d6c9c97853ada47c4748d6965fca54692dbf665 /arch/powerpc/include/asm/asm-compat.h | |
parent | 17081102a6e0fe32cf47cdbdf8f2e9ab55273b08 (diff) | |
download | blackbird-op-linux-4e14a4d17a8cd66ccab180d32c977091922cfbed.tar.gz blackbird-op-linux-4e14a4d17a8cd66ccab180d32c977091922cfbed.zip |
powerpc: Use lwarx hint in spinlocks
Recent versions of the PowerPC architecture added a hint bit to the larx
instructions to differentiate between an atomic operation and a lock operation:
> 0 Other programs might attempt to modify the word in storage addressed by EA
> even if the subsequent Store Conditional succeeds.
>
> 1 Other programs will not attempt to modify the word in storage addressed by
> EA until the program that has acquired the lock performs a subsequent store
> releasing the lock.
To avoid a binutils dependency this patch create macros for the extended lwarx
format and uses it in the spinlock code. To test this change I used a simple
test case that acquires and releases a global pthread mutex:
pthread_mutex_lock(&mutex);
pthread_mutex_unlock(&mutex);
On a 32 core POWER6, running 32 test threads we spend almost all our time in
the futex spinlock code:
94.37% perf [kernel] [k] ._raw_spin_lock
|
|--99.95%-- ._raw_spin_lock
| |
| |--63.29%-- .futex_wake
| |
| |--36.64%-- .futex_wait_setup
Which is a good test for this patch. The results (in lock/unlock operations per
second) are:
before: 1538203 ops/sec
after: 2189219 ops/sec
An improvement of 42%
A 32 core POWER7 improves even more:
before: 1279529 ops/sec
after: 2282076 ops/sec
An improvement of 78%
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm/asm-compat.h')
0 files changed, 0 insertions, 0 deletions