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authorAndi Kleen <ak@linux.intel.com>2014-03-31 08:07:46 -0700
committerAndi Kleen <ak@linux.intel.com>2014-06-13 13:15:28 -0700
commit8491ed6d70b60e4c75cdcfde10ae759898547b08 (patch)
treef26bd7e65ec2a860474297d5c8b87d49193ca4f2 /sysdeps/unix
parenta832bdd36203fcb37fa5ad25200ef3c1ae205efe (diff)
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Add adaptive elision to rwlocks
This patch relies on the C version of the rwlocks posted earlier.
With C rwlocks it is very straight forward to do adaptive elision
using TSX. It is based on the infrastructure added earlier
for mutexes, but uses its own elision macros. The macros
are fairly general purpose and could be used for other
elision purposes too.

This version is much cleaner than the earlier assembler based
version, and in particular implements adaptation which makes
it safer.

I changed the behavior slightly to not require any changes
in the test suite and fully conform to all expected
behaviors (generally at the cost of not eliding in
various situations). In particular this means the timedlock
variants are not elided.  Nested trylock aborts.
Diffstat (limited to 'sysdeps/unix')
-rw-r--r--sysdeps/unix/sysv/linux/aarch64/nptl/bits/pthreadtypes.h2
-rw-r--r--sysdeps/unix/sysv/linux/alpha/bits/pthreadtypes.h2
-rw-r--r--sysdeps/unix/sysv/linux/hppa/nptl/bits/pthreadtypes.h2
-rw-r--r--sysdeps/unix/sysv/linux/ia64/nptl/bits/pthreadtypes.h2
-rw-r--r--sysdeps/unix/sysv/linux/m68k/nptl/bits/pthreadtypes.h2
-rw-r--r--sysdeps/unix/sysv/linux/microblaze/nptl/bits/pthreadtypes.h2
-rw-r--r--sysdeps/unix/sysv/linux/mips/nptl/bits/pthreadtypes.h2
-rw-r--r--sysdeps/unix/sysv/linux/powerpc/bits/pthreadtypes.h2
-rw-r--r--sysdeps/unix/sysv/linux/x86/elision-conf.c2
9 files changed, 18 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/aarch64/nptl/bits/pthreadtypes.h b/sysdeps/unix/sysv/linux/aarch64/nptl/bits/pthreadtypes.h
index 1a44bb6101..5ad0e700be 100644
--- a/sysdeps/unix/sysv/linux/aarch64/nptl/bits/pthreadtypes.h
+++ b/sysdeps/unix/sysv/linux/aarch64/nptl/bits/pthreadtypes.h
@@ -141,6 +141,8 @@ typedef union
   long int __align;
 } pthread_rwlock_t;
 
+#define __PTHREAD_RWLOCK_ELISION_EXTRA 0
+
 typedef union
 {
   char __size[__SIZEOF_PTHREAD_RWLOCKATTR_T];
diff --git a/sysdeps/unix/sysv/linux/alpha/bits/pthreadtypes.h b/sysdeps/unix/sysv/linux/alpha/bits/pthreadtypes.h
index 3dbe6127dd..55f1067c70 100644
--- a/sysdeps/unix/sysv/linux/alpha/bits/pthreadtypes.h
+++ b/sysdeps/unix/sysv/linux/alpha/bits/pthreadtypes.h
@@ -142,6 +142,8 @@ typedef union
   long int __align;
 } pthread_rwlock_t;
 
+#define __PTHREAD_RWLOCK_ELISION_EXTRA 0
+
 typedef union
 {
   char __size[__SIZEOF_PTHREAD_RWLOCKATTR_T];
diff --git a/sysdeps/unix/sysv/linux/hppa/nptl/bits/pthreadtypes.h b/sysdeps/unix/sysv/linux/hppa/nptl/bits/pthreadtypes.h
index a79c195d9a..d6fdc2c44d 100644
--- a/sysdeps/unix/sysv/linux/hppa/nptl/bits/pthreadtypes.h
+++ b/sysdeps/unix/sysv/linux/hppa/nptl/bits/pthreadtypes.h
@@ -196,6 +196,8 @@ typedef union
   long int __align;
 } pthread_rwlock_t;
 
+#define __PTHREAD_RWLOCK_ELISION_EXTRA 0
+
 typedef union
 {
   char __size[__SIZEOF_PTHREAD_RWLOCKATTR_T];
diff --git a/sysdeps/unix/sysv/linux/ia64/nptl/bits/pthreadtypes.h b/sysdeps/unix/sysv/linux/ia64/nptl/bits/pthreadtypes.h
index 9468329000..71e4785e64 100644
--- a/sysdeps/unix/sysv/linux/ia64/nptl/bits/pthreadtypes.h
+++ b/sysdeps/unix/sysv/linux/ia64/nptl/bits/pthreadtypes.h
@@ -143,6 +143,8 @@ typedef union
   long int __align;
 } pthread_rwlock_t;
 
+#define __PTHREAD_RWLOCK_ELISION_EXTRA 0
+
 typedef union
 {
   char __size[__SIZEOF_PTHREAD_RWLOCKATTR_T];
diff --git a/sysdeps/unix/sysv/linux/m68k/nptl/bits/pthreadtypes.h b/sysdeps/unix/sysv/linux/m68k/nptl/bits/pthreadtypes.h
index 1e1fed82dc..fd46c781b3 100644
--- a/sysdeps/unix/sysv/linux/m68k/nptl/bits/pthreadtypes.h
+++ b/sysdeps/unix/sysv/linux/m68k/nptl/bits/pthreadtypes.h
@@ -146,6 +146,8 @@ typedef union
   long int __align;
 } pthread_rwlock_t;
 
+#define __PTHREAD_RWLOCK_ELISION_EXTRA 0
+
 typedef union
 {
   char __size[__SIZEOF_PTHREAD_RWLOCKATTR_T];
diff --git a/sysdeps/unix/sysv/linux/microblaze/nptl/bits/pthreadtypes.h b/sysdeps/unix/sysv/linux/microblaze/nptl/bits/pthreadtypes.h
index 9c7e620e2e..943445384b 100644
--- a/sysdeps/unix/sysv/linux/microblaze/nptl/bits/pthreadtypes.h
+++ b/sysdeps/unix/sysv/linux/microblaze/nptl/bits/pthreadtypes.h
@@ -150,6 +150,8 @@ typedef union
   long int __align;
 } pthread_rwlock_t;
 
+#define __PTHREAD_RWLOCK_ELISION_EXTRA 0
+
 typedef union
 {
   char __size[__SIZEOF_PTHREAD_RWLOCKATTR_T];
diff --git a/sysdeps/unix/sysv/linux/mips/nptl/bits/pthreadtypes.h b/sysdeps/unix/sysv/linux/mips/nptl/bits/pthreadtypes.h
index cefd2b6316..843031e854 100644
--- a/sysdeps/unix/sysv/linux/mips/nptl/bits/pthreadtypes.h
+++ b/sysdeps/unix/sysv/linux/mips/nptl/bits/pthreadtypes.h
@@ -203,6 +203,8 @@ typedef union
   long int __align;
 } pthread_rwlock_t;
 
+#define __PTHREAD_RWLOCK_ELISION_EXTRA 0
+
 typedef union
 {
   char __size[__SIZEOF_PTHREAD_RWLOCKATTR_T];
diff --git a/sysdeps/unix/sysv/linux/powerpc/bits/pthreadtypes.h b/sysdeps/unix/sysv/linux/powerpc/bits/pthreadtypes.h
index eda3d1a3e4..4e9c5184aa 100644
--- a/sysdeps/unix/sysv/linux/powerpc/bits/pthreadtypes.h
+++ b/sysdeps/unix/sysv/linux/powerpc/bits/pthreadtypes.h
@@ -194,6 +194,8 @@ typedef union
   long int __align;
 } pthread_rwlock_t;
 
+#define __PTHREAD_RWLOCK_ELISION_EXTRA 0
+
 typedef union
 {
   char __size[__SIZEOF_PTHREAD_RWLOCKATTR_T];
diff --git a/sysdeps/unix/sysv/linux/x86/elision-conf.c b/sysdeps/unix/sysv/linux/x86/elision-conf.c
index e6f5d6d1ab..28e48d9e92 100644
--- a/sysdeps/unix/sysv/linux/x86/elision-conf.c
+++ b/sysdeps/unix/sysv/linux/x86/elision-conf.c
@@ -66,6 +66,8 @@ elision_init (int argc __attribute__ ((unused)),
 #ifdef ENABLE_LOCK_ELISION
   __pthread_force_elision = __libc_enable_secure ? 0 : __elision_available;
 #endif
+  if (!HAS_RTM)
+    __elision_aconf.retry_try_xbegin = 0; /* Disable elision on rwlocks */
 }
 
 #ifdef SHARED