diff options
| author | Stefan Liebler <stli@linux.vnet.ibm.com> | 2017-02-06 13:44:23 +0100 |
|---|---|---|
| committer | Stefan Liebler <stli@linux.vnet.ibm.com> | 2017-02-06 13:46:01 +0100 |
| commit | df3a4e104fb63f96f05b29931dd83e272c2b7936 (patch) | |
| tree | 522482c35a920df919a91102c0b4a54bd897d97a /ChangeLog | |
| parent | f2d7f23a300f57e36cd849ce80a93ccbcebd9968 (diff) | |
| download | glibc-df3a4e104fb63f96f05b29931dd83e272c2b7936.tar.gz glibc-df3a4e104fb63f96f05b29931dd83e272c2b7936.tar.xz glibc-df3a4e104fb63f96f05b29931dd83e272c2b7936.zip | |
Add __glibc_unlikely hint in lll_trylock, lll_cond_trylock.
The macros lll_trylock, lll_cond_trylock are extended by an __glibc_unlikely hint. Now the trylock macros are based on the same assumption about a free/busy lock as lll_lock. With the hint gcc emits code in e.g. pthread_mutex_trylock which does not use jumps if the lock is free. Without the hint it had to jump away if the lock is free. Tested on s390x, ppc. ChangeLog: * sysdeps/nptl/lowlevellock.h (lll_trylock, lll_cond_trylock): Add __glibc_unlikely hint.
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index dd0a0b519f..e4885cf260 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,8 @@ +2017-02-06 Stefan Liebler <stli@linux.vnet.ibm.com> + + * sysdeps/nptl/lowlevellock.h (lll_trylock, lll_cond_trylock): + Add __glibc_unlikely hint. + 2017-02-06 Adhemerval Zanella <adhemerval.zanella@linaro.org> [BZ #16640] |