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| author | Paul Murphy <murphyp@linux.vnet.ibm.com> | 2015-08-27 09:48:04 -0500 |
|---|---|---|
| committer | Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com> | 2015-10-27 17:27:41 -0200 |
| commit | 72f1463df85a522bfd1568e47bd81371522ee358 (patch) | |
| tree | a257dcbec150b619574c29326f89ee10d013891f /sysdeps/powerpc | |
| parent | 76c5ae00284d98f1994434c570bdcde9dbc6b49e (diff) | |
| download | glibc-72f1463df85a522bfd1568e47bd81371522ee358.tar glibc-72f1463df85a522bfd1568e47bd81371522ee358.tar.gz glibc-72f1463df85a522bfd1568e47bd81371522ee358.tar.bz2 glibc-72f1463df85a522bfd1568e47bd81371522ee358.zip | |
powerpc: Fix usage of elision transient failure adapt param
The skip_lock_out_of_tbegin_retries adaptive parameter was
not being used correctly, nor as described. This prevents
a fallback for all users of the lock if a transient abort
occurs within the accepted number of retries.
[BZ #19174]
* sysdeps/powerpc/nptl/elide.h (__elide_lock): Fix usage of
.skip_lock_out_of_tbegin_retries.
* sysdeps/unix/sysv/linux/powerpc/elision-lock.c
(__lll_lock_elision): Likewise, and respect a value of
try_tbegin <= 0.
Diffstat (limited to 'sysdeps/powerpc')
| -rw-r--r-- | sysdeps/powerpc/nptl/elide.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/sysdeps/powerpc/nptl/elide.h b/sysdeps/powerpc/nptl/elide.h index 12171f45dc..2e1e443278 100644 --- a/sysdeps/powerpc/nptl/elide.h +++ b/sysdeps/powerpc/nptl/elide.h @@ -27,7 +27,7 @@ configurations. Returns true if the system should retry again or false otherwise. */ static inline bool -__get_new_count (uint8_t *adapt_count) +__get_new_count (uint8_t *adapt_count, int attempt) { /* A persistent failure indicates that a retry will probably result in another failure. Use normal locking now and @@ -40,7 +40,7 @@ __get_new_count (uint8_t *adapt_count) } /* Same logic as above, but for a number of temporary failures in a a row. */ - else if (__elision_aconf.skip_lock_out_of_tbegin_retries > 0 + else if (attempt <= 1 && __elision_aconf.skip_lock_out_of_tbegin_retries > 0 && __elision_aconf.try_tbegin > 0) *adapt_count = __elision_aconf.skip_lock_out_of_tbegin_retries; return true; @@ -78,7 +78,7 @@ __get_new_count (uint8_t *adapt_count) __builtin_tabort (_ABORT_LOCK_BUSY); \ } \ else \ - if (!__get_new_count(&adapt_count)) \ + if (!__get_new_count (&adapt_count,i)) \ break; \ } \ ret; \ |