about summary refs log tree commit diff
path: root/NEWS
diff options
context:
space:
mode:
authorDominik Vogt <vogt@linux.vnet.ibm.com>2014-05-09 16:58:46 +0200
committerAndreas Krebbel <krebbel@linux.vnet.ibm.com>2014-05-09 16:58:46 +0200
commit5a414ff70c3a45e52b5f5c0741bd459a84cf56b8 (patch)
tree036ad6a707ea587149cb057f3e41b7bdd086cbdd /NEWS
parentf63c86fed0ddf38f53de486c5ec537455c00bd52 (diff)
downloadglibc-5a414ff70c3a45e52b5f5c0741bd459a84cf56b8.tar.gz
glibc-5a414ff70c3a45e52b5f5c0741bd459a84cf56b8.tar.xz
glibc-5a414ff70c3a45e52b5f5c0741bd459a84cf56b8.zip
S/390: Port of lock elision to System/z
Added support for TX lock elision of pthread mutexes on s390 and
s390x.  This may improve lock scaling of existing programs on TX
capable systems.  The lock elision code is only built with
--enable-lock-elision=yes and then requires a GCC version supporting
the TX builtins.  With lock elision default mutexes are elided via
__builtin_tbegin, if the cpu supports transactions. By default lock
elision is not enabled and the elision code is not built.
Diffstat (limited to 'NEWS')
-rw-r--r--NEWS8
1 files changed, 8 insertions, 0 deletions
diff --git a/NEWS b/NEWS
index 40068712dc..fae2b82607 100644
--- a/NEWS
+++ b/NEWS
@@ -40,6 +40,14 @@ Version 2.20
   test macros defined.
 
 * Optimized strcmp implementation for ARMv7.  Contributed by ARM Ltd.
+
+* Added support for TX lock elision of pthread mutexes on s390 and s390x.
+  This may improve lock scaling of existing programs on TX capable systems.
+  The lock elision code is only built with --enable-lock-elision=yes and
+  then requires a GCC version supporting the TX builtins.  With lock elision
+  default mutexes are elided via __builtin_tbegin, if the cpu supports
+  transactions. By default lock elision is not enabled and the elision code
+  is not built.
 
 Version 2.19