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vppinfra: implement CLIB_PAUSE () for aarch64 platforms

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Define CLIB_PAUSE () to generate the "yield" instruction. No significant
performance changes were observed for clib_spinlock_t and clib_rwlock_t.

Type: feature

Change-Id: I59eb996e61c7a16007517e57e6996567302c1657
Signed-off-by: Jason Zhang <jason.zhang2@arm.com>
Reviewed-by: Lijian Zhang <Lijian.Zhang@arm.com>
(cherry picked from commit 18512b002da5da312aa2638b67a8ec4bb2c10236)
This commit is contained in:
jaszha03
2019-09-27 11:48:23 -05:00
committed by Andrew Yourtchenko
parent 3642782a27
commit a3c45242b1
1 changed files with 2 additions and 0 deletions
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2
src/vppinfra/lock.h
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@ -21,6 +21,8 @@
#if __x86_64__
#define CLIB_PAUSE() __builtin_ia32_pause ()
#elif defined (__aarch64__) || defined (__arm__)
#define CLIB_PAUSE() __asm__ ("yield")
#else
#define CLIB_PAUSE()
#endif