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[ping2][PATCH 2/2] Port of lock elision to System/z v2


> Implementation of lock elision for pthread_mutexes.  Similar to
> the Intel patches, but with significant modifications regarding
> performance of the patches.
> 
> Ciao
> 
> Dominik ^_^  ^_^
> 
> -- 
> 
> Dominik Vogt
> IBM Germany
>From 5015d7e930d7057f2af4f9df9e6ba86747b3c178 Mon Sep 17 00:00:00 2001
From: Dominik Vogt <vogt@de.ibm.com>
Date: Wed, 10 Apr 2013 15:14:17 +0200
Subject: [PATCH 02/10] s390: Elided pthread_mutexes.

---
 nptl/sysdeps/unix/sysv/linux/s390/Makefile         |  2 +-
 .../unix/sysv/linux/s390/bits/pthreadtypes.h       | 12 +++-
 nptl/sysdeps/unix/sysv/linux/s390/elision-common.c | 22 ------
 nptl/sysdeps/unix/sysv/linux/s390/elision-common.h | 25 -------
 nptl/sysdeps/unix/sysv/linux/s390/elision-conf.c   |  7 +-
 nptl/sysdeps/unix/sysv/linux/s390/elision-conf.h   |  3 +-
 nptl/sysdeps/unix/sysv/linux/s390/elision-lock.c   | 78 ++++++++++++----------
 .../sysdeps/unix/sysv/linux/s390/elision-trylock.c | 57 +++++++++-------
 nptl/sysdeps/unix/sysv/linux/s390/elision-unlock.c | 16 +++--
 nptl/sysdeps/unix/sysv/linux/s390/force-elision.h  | 31 +++++++++
 nptl/sysdeps/unix/sysv/linux/s390/htm.h            |  8 ++-
 .../unix/sysv/linux/s390/pthread_mutex_cond_lock.c | 22 ++++++
 .../unix/sysv/linux/s390/pthread_mutex_lock.c      | 22 ++++++
 .../unix/sysv/linux/s390/pthread_mutex_timedlock.c | 22 ++++++
 .../unix/sysv/linux/s390/pthread_mutex_trylock.c   | 22 ++++++
 .../unix/sysv/linux/s390/pthread_mutex_unlock.c    | 19 ++++++
 16 files changed, 246 insertions(+), 122 deletions(-)
 delete mode 100644 nptl/sysdeps/unix/sysv/linux/s390/elision-common.c
 delete mode 100644 nptl/sysdeps/unix/sysv/linux/s390/elision-common.h
 create mode 100644 nptl/sysdeps/unix/sysv/linux/s390/force-elision.h
 create mode 100644 nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_cond_lock.c
 create mode 100644 nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_lock.c
 create mode 100644 nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_timedlock.c
 create mode 100644 nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_trylock.c
 create mode 100644 nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_unlock.c

diff --git a/nptl/sysdeps/unix/sysv/linux/s390/Makefile b/nptl/sysdeps/unix/sysv/linux/s390/Makefile
index 6a6b455..01a4004 100644
--- a/nptl/sysdeps/unix/sysv/linux/s390/Makefile
+++ b/nptl/sysdeps/unix/sysv/linux/s390/Makefile
@@ -1,2 +1,2 @@
 libpthread-sysdep_routines += elision-lock elision-unlock elision-timed \
-			      elision-trylock elision-common
+			      elision-trylock
diff --git a/nptl/sysdeps/unix/sysv/linux/s390/bits/pthreadtypes.h b/nptl/sysdeps/unix/sysv/linux/s390/bits/pthreadtypes.h
index 75785d9..2a7c998 100644
--- a/nptl/sysdeps/unix/sysv/linux/s390/bits/pthreadtypes.h
+++ b/nptl/sysdeps/unix/sysv/linux/s390/bits/pthreadtypes.h
@@ -89,13 +89,23 @@ typedef union
        binary compatibility.  */
     int __kind;
 #if __WORDSIZE == 64
-    int __spins;
+    short __spins;
+    short __elision;
     __pthread_list_t __list;
 # define __PTHREAD_MUTEX_HAVE_PREV	1
+# define __PTHREAD_MUTEX_HAVE_ELISION   1
 #else
     unsigned int __nusers;
     __extension__ union
     {
+      struct
+      {
+	short __espins;
+	short __elision;
+# define __spins d.__espins
+# define __elision d.__elision
+# define __PTHREAD_MUTEX_HAVE_ELISION   2
+      } d;
       int __spins;
       __pthread_slist_t __list;
     };
diff --git a/nptl/sysdeps/unix/sysv/linux/s390/elision-common.c b/nptl/sysdeps/unix/sysv/linux/s390/elision-common.c
deleted file mode 100644
index e44e4ed..0000000
--- a/nptl/sysdeps/unix/sysv/linux/s390/elision-common.c
+++ /dev/null
@@ -1,22 +0,0 @@
-/* elision-common.c: Code shared by specific elision function implementations.
-   Copyright (C) 2011, 2012, 2013 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#include <elision-common.h>
-
-__thread uint64_t __attribute__ ((aligned(8))) __rtm_explicit_abort_rc = 0;
-libc_hidden_def (__rtm_explicit_abort_rc);
diff --git a/nptl/sysdeps/unix/sysv/linux/s390/elision-common.h b/nptl/sysdeps/unix/sysv/linux/s390/elision-common.h
deleted file mode 100644
index 182d4a3..0000000
--- a/nptl/sysdeps/unix/sysv/linux/s390/elision-common.h
+++ /dev/null
@@ -1,25 +0,0 @@
-/* elision-common.h: Code shared by specific elision function implementations.
-   Copyright (C) 2011, 2012, 2013 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-#ifndef _ELISION_COMMON_H
-#define _ELISION_COMMON_H 1
-
-#include <tls.h>
-
-extern __thread uint64_t __rtm_explicit_abort_rc;
-
-#endif
diff --git a/nptl/sysdeps/unix/sysv/linux/s390/elision-conf.c b/nptl/sysdeps/unix/sysv/linux/s390/elision-conf.c
index 76df37f..df6f516 100644
--- a/nptl/sysdeps/unix/sysv/linux/s390/elision-conf.c
+++ b/nptl/sysdeps/unix/sysv/linux/s390/elision-conf.c
@@ -35,10 +35,13 @@ struct elision_config __elision_aconf =
        to reasons other than other threads' memory accesses.  Expressed in
        number of lock acquisition attempts.  */
     .skip_lock_internal_abort = 3,
-    /* How often we retry using elision if there is chance for the transaction
+    /* How often to not attempt to use elision if a lock used up all retries
+       without success.  Expressed in number of lock acquisition attempts.  */
+    .skip_lock_out_of_xbegin_retries = 3,
+    /* How often we try using elision if there is chance for the transaction
        to finish execution (e.g., it wasn't aborted due to the lock being
        already acquired.  */
-    .retry_try_xbegin = 3,
+    .try_xbegin = 3,
     /* Same as SKIP_LOCK_INTERNAL_ABORT but for trylock.  */
     .skip_trylock_internal_abort = 3,
   };
diff --git a/nptl/sysdeps/unix/sysv/linux/s390/elision-conf.h b/nptl/sysdeps/unix/sysv/linux/s390/elision-conf.h
index c62b723..c4695d1 100644
--- a/nptl/sysdeps/unix/sysv/linux/s390/elision-conf.h
+++ b/nptl/sysdeps/unix/sysv/linux/s390/elision-conf.h
@@ -27,7 +27,8 @@ struct elision_config
 {
   int skip_lock_busy;
   int skip_lock_internal_abort;
-  int retry_try_xbegin;
+  int skip_lock_out_of_xbegin_retries;
+  int try_xbegin;
   int skip_trylock_internal_abort;
 };

diff --git a/nptl/sysdeps/unix/sysv/linux/s390/elision-lock.c b/nptl/sysdeps/unix/sysv/linux/s390/elision-lock.c
index ec0db56..b9ff8fd 100644
--- a/nptl/sysdeps/unix/sysv/linux/s390/elision-lock.c
+++ b/nptl/sysdeps/unix/sysv/linux/s390/elision-lock.c
@@ -1,5 +1,5 @@
 /* elision-lock.c: Elided pthread mutex lock.
-   Copyright (C) 2011-2013 Free Software Foundation, Inc.
+   Copyright (C) 2013 Free Software Foundation, Inc.
    This file is part of the GNU C Library.

    The GNU C Library is free software; you can redistribute it and/or
@@ -21,7 +21,6 @@
 #include <lowlevellock.h>
 #include "htm.h"
 #include <elision-conf.h>
-#include "elision-common.h"

 #if !defined(LLL_LOCK) && !defined(EXTRAARG)
 /* Make sure the configuration code is always linked in for static
@@ -47,59 +46,68 @@ __lll_lock_elision (int *futex, short *adapt_count, EXTRAARG int private)
 {
   if (*adapt_count <= 0)
     {
-      unsigned status;
       int try_xbegin;
-      uint64_t explicit_abort_rc;

-      for (try_xbegin = aconf.retry_try_xbegin;
+      for (try_xbegin = aconf.try_xbegin;
 	   try_xbegin > 0;
 	   try_xbegin--)
 	{
+	  unsigned status;
+
 	  if (__builtin_expect
 	      ((status = __builtin_tbegin((void *)0)) == _TBEGIN_OK, 1))
 	    {
 	      if (*futex == 0)
 		return 0;
-
-	      /* Lock was busy.  Fall back to normal locking.  We cannot use
-		 _tend here because this might not be the outermost
-		 transaction.  */
-	      __builtin_non_tx_store (&__rtm_explicit_abort_rc,
-				      _ABORT_LOCK_BUSY);
-	      __builtin_tabort (_ABORT_LOCK_BUSY);
+	      /* Lock was busy.  Fall back to normal locking.  */
+	      if (__builtin_expect (__builtin_tx_nesting_depth (), 1))
+		{
+		  /* In a non-nested transaction there is no need to abort,
+		     which is expensive.  */
+		  __builtin_tend ();
+		  if (aconf.skip_lock_busy > 0)
+		    *adapt_count = aconf.skip_lock_busy;
+		  goto use_lock;
+		}
+	      else /* nesting depth is > 1 */
+		{
+		  if (aconf.skip_lock_busy > 0)
+		    __builtin_non_tx_store (*adapt_count, aconf.skip_lock_busy);
+		  /* A nested transaction will abort eventually because it
+		     cannot make any progress before *futex changes back to 0.
+		     So we may as well abort immediately.  */
+		  __builtin_tabort (_ABORT_USER_TEMPORARY);
+		}
 	    }
-
-	  asm volatile (
-	    "" ::: "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", "f8", "f9",
-	    "f10", "f11", "f12", "f13", "f14", "f15", "cc", "memory");
-	  explicit_abort_rc = __rtm_explicit_abort_rc;
-	  __rtm_explicit_abort_rc = 0;
-
-	  if (status != _TABORT_RETRY)
+	  else
 	    {
-	      if (explicit_abort_rc == _ABORT_LOCK_BUSY)
-	        {
-		  /* Right now we skip here.  Better would be to wait a bit
-		     and retry.  This likely needs some spinning.  */
-		  if (*adapt_count != aconf.skip_lock_busy)
-		    *adapt_count = aconf.skip_lock_busy;
+	      asm volatile ("" ::: "f0", "f1", "f2", "f3", "f4", "f5", "f6",
+			    "f7", "f8", "f9", "f10", "f11", "f12", "f13",
+			    "f14", "f15", "cc", "memory");
+	      if (status != _TABORT_RETRY)
+		{
+		  /* A persistent abort (cc 1 or 3) indicates that a retry is
+		     probably futile.  Use the normal locking now and for the
+		     next couple of calls.
+		     Be careful to avoid writing to the lock.  */
+		  if (aconf.skip_lock_internal_abort > 0)
+		    *adapt_count = aconf.skip_lock_internal_abort;
+		  goto use_lock;
 		}
-	      /* The condition code indicates that a retry is probably futile.
-		 Use the normal locking and next time use lock.
-		 Be careful to avoid writing to the lock.  */
-	      else if (*adapt_count != aconf.skip_lock_internal_abort)
-		*adapt_count = aconf.skip_lock_internal_abort;
-	      break;
 	    }
 	}
+      /* Same logic as above, but for for a number of tepmorary failures in a
+	 row.  */
+      if (aconf.skip_lock_out_of_xbegin_retries > 0 && aconf.try_xbegin > 0)
+	*adapt_count = aconf.skip_lock_out_of_xbegin_retries;
     }
   else
     {
-      /* Use a normal lock until the threshold counter runs out.
-	 Lost updates possible.  */
+      /* Lost updates are possible, but harmless.  Due to races this might lead
+	 to *adapt_count becoming less than zero.  */
       (*adapt_count)--;
     }

-  /* Use a normal lock here.  */
+  use_lock:
   return LLL_LOCK ((*futex), private);
 }
diff --git a/nptl/sysdeps/unix/sysv/linux/s390/elision-trylock.c b/nptl/sysdeps/unix/sysv/linux/s390/elision-trylock.c
index 9eed967..ee28a1e 100644
--- a/nptl/sysdeps/unix/sysv/linux/s390/elision-trylock.c
+++ b/nptl/sysdeps/unix/sysv/linux/s390/elision-trylock.c
@@ -1,4 +1,4 @@
-/* elision-trylock.c: Lock eliding trylock for pthreads.
+/* elision-trylock.c: Elided pthread mutex trylock.
    Copyright (C) 2013 Free Software Foundation, Inc.
    This file is part of the GNU C Library.

@@ -21,7 +21,6 @@
 #include <lowlevellock.h>
 #include "htm.h"
 #include <elision-conf.h>
-#include "elision-common.h"

 #define aconf __elision_aconf

@@ -31,14 +30,15 @@
 int
 __lll_trylock_elision (int *futex, short *adapt_count)
 {
-  /* Implement POSIX semantics by forbiding nesting
-     trylock.  Sorry.  After the abort the code is re-executed
+  /* Implement POSIX semantics by forbiding nesting elided trylocks.
+     Sorry.  After the abort the code is re-executed
      non transactional and if the lock was already locked
      return an error.  */
   if (__builtin_tx_nesting_depth () > 0)
     {
-      __builtin_non_tx_store (&__rtm_explicit_abort_rc, _ABORT_NESTED_TRYLOCK);
-      __builtin_tabort (_ABORT_NESTED_TRYLOCK);
+      /* Note that this abort may terminate an outermost transaction that
+	 was created outside glibc.  */
+      __builtin_tabort (_ABORT_USER_PERSISTENT);
     }

   /* Only try a transaction if it's worth it.  */
@@ -51,30 +51,37 @@ __lll_trylock_elision (int *futex, short *adapt_count)
 	{
 	  if (*futex == 0)
 	    return 0;
-
-	  /* Lock was busy.  Fall back to normal locking.  We cannot use
-	     _tend here because this might not be the outermost
-	     transaction.  */
-	  __builtin_non_tx_store (&__rtm_explicit_abort_rc, _ABORT_LOCK_BUSY);
-	  __builtin_tabort (_ABORT_LOCK_BUSY);
+	  /* Lock was busy.  Fall back to normal locking.  */
+	  /* Since we are in a non-nested transaction there is no need to abort,
+	     which is expensive.  */
+	  __builtin_tend ();
+	  /* Note: Changing the adapt_count here might abort a transaction on a
+	     different cpu, but that could happen anyway when the futex is
+	     acquired, so there's no need to check the nesting depth here.  */
+	  if (aconf.skip_lock_busy > 0)
+	    *adapt_count = aconf.skip_lock_busy;
+	}
+      else
+	{
+	  asm volatile ("" ::: "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
+			"f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
+			"cc", "memory");
+	  if (status != _TABORT_RETRY)
+	    {
+	      /* A persistent abort (cc 1 or 3) indicates that a retry is
+		 probably futile.  Use the normal locking now and for the
+		 next couple of calls.
+		 Be careful to avoid writing to the lock.  */
+	      if (aconf.skip_trylock_internal_abort > 0)
+		*adapt_count = aconf.skip_trylock_internal_abort;
+	    }
 	}
-
-      asm volatile (
-	"" ::: "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", "f8", "f9",
-	"f10", "f11", "f12", "f13", "f14", "f15", "cc", "memory");
-      __rtm_explicit_abort_rc = 0;
-      if (status != _TABORT_RETRY)
-        {
-          /* The condition code indicates that a retry is probably futile.
-	     For future locks don't try speculation for some time.  */
-          if (*adapt_count != aconf.skip_trylock_internal_abort)
-            *adapt_count = aconf.skip_trylock_internal_abort;
-        }
       /* Could do some retries here.  */
     }
   else
     {
-      /* Lost updates are possible, but harmless.  */
+      /* Lost updates are possible, but harmless.  Due to races this might lead
+	 to *adapt_count becoming less than zero.  */
       (*adapt_count)--;
     }

diff --git a/nptl/sysdeps/unix/sysv/linux/s390/elision-unlock.c b/nptl/sysdeps/unix/sysv/linux/s390/elision-unlock.c
index ac42d24..d7e27fe 100644
--- a/nptl/sysdeps/unix/sysv/linux/s390/elision-unlock.c
+++ b/nptl/sysdeps/unix/sysv/linux/s390/elision-unlock.c
@@ -23,16 +23,18 @@
 int
 __lll_unlock_elision(int *lock, int private)
 {
-  /* When the lock was free we're in a transaction.
-     When you crash here you unlocked a free lock.  */
+  /* If the lock is free, we elided the lock earlier.  This does not
+     necessarily mean that we are in a transaction, because the user code may
+     have closed the transaction.  Although the program might then fail, the
+     unlock function needs to handle this situation without crashing.  */
   if (*lock == 0)
     {
-      /* The instruction ETND is slower than TEND, so the latter is used to
-	 check whether there was an active transaction.  */
-      if (__builtin_expect (__builtin_tend() != 0, 0))
+      /* Although on zEC12 the instruction ETND is slower than TEND, we cannot
+	 use TEND here because if no elided lock is pending, TEND could close a
+	 transaction that was started outside glibc.  */
+      if (__builtin_tx_nesting_depth () > 0)
 	{
-	  /* Lock released outside a transaction.  */
-	  abort ();
+	  __builtin_tend();
 	}
     }
   else
diff --git a/nptl/sysdeps/unix/sysv/linux/s390/force-elision.h b/nptl/sysdeps/unix/sysv/linux/s390/force-elision.h
new file mode 100644
index 0000000..9789905
--- /dev/null
+++ b/nptl/sysdeps/unix/sysv/linux/s390/force-elision.h
@@ -0,0 +1,31 @@
+/* force-elision.h: Automatic enabling of elision for mutexes
+   Copyright (C) 2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* Check for elision on this lock without upgrading.  */
+#define DO_ELISION(m)							\
+  (__pthread_force_elision						\
+   && (m->__data.__kind & PTHREAD_MUTEX_NO_ELISION_NP) == 0)		\
+
+/* Automatically enable elision for existing user lock kinds.  */
+#define FORCE_ELISION(m, s)						\
+  if (__pthread_force_elision						\
+      && (m->__data.__kind & PTHREAD_MUTEX_ELISION_FLAGS_NP) == 0)	\
+    {									\
+      mutex->__data.__kind |= PTHREAD_MUTEX_ELISION_NP;			\
+      s;								\
+    }
diff --git a/nptl/sysdeps/unix/sysv/linux/s390/htm.h b/nptl/sysdeps/unix/sysv/linux/s390/htm.h
index 3e0fbd1..49f76a5 100644
--- a/nptl/sysdeps/unix/sysv/linux/s390/htm.h
+++ b/nptl/sysdeps/unix/sysv/linux/s390/htm.h
@@ -38,11 +38,13 @@

 #define _TBEGIN_OK		(0u)
 #define _TABORT_RETRY		(2u)
+#define _TABORT_NO_RETRY	(3u)
 #define _TABORT_CODE(x)		(((x) >> 24) & 0xff)

-#define _ABORT_LOCK_BUSY 	0x1ff
-#define _ABORT_LOCK_IS_LOCKED	0x1fe
-#define _ABORT_NESTED_TRYLOCK	0x1fd
+/* Odd abort codes are persistent failures (cc 3), even abort codes are
+   temporary failures (cc 2). */
+#define _ABORT_USER_TEMPORARY	0x100
+#define _ABORT_USER_PERSISTENT	0x101
 #endif

 #ifndef __ASSEMBLER__
diff --git a/nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_cond_lock.c b/nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_cond_lock.c
new file mode 100644
index 0000000..fe64e02
--- /dev/null
+++ b/nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_cond_lock.c
@@ -0,0 +1,22 @@
+/* Copyright (C) 2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* The cond lock is not actually elided yet, but we still need to handle
+   already elided locks.  */
+#include <elision-conf.h>
+
+#include "sysdeps/unix/sysv/linux/pthread_mutex_cond_lock.c"
diff --git a/nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_lock.c b/nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_lock.c
new file mode 100644
index 0000000..37b122f
--- /dev/null
+++ b/nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_lock.c
@@ -0,0 +1,22 @@
+/* Elided version of pthread_mutex_lock.
+   Copyright (C) 2011, 2012, 2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <elision-conf.h>
+#include "force-elision.h"
+
+#include "nptl/pthread_mutex_lock.c"
diff --git a/nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_timedlock.c b/nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_timedlock.c
new file mode 100644
index 0000000..ddc6d92
--- /dev/null
+++ b/nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_timedlock.c
@@ -0,0 +1,22 @@
+/* Elided version of pthread_mutex_timedlock.
+   Copyright (C) 2011, 2012, 2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <elision-conf.h>
+#include "force-elision.h"
+
+#include "nptl/pthread_mutex_timedlock.c"
diff --git a/nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_trylock.c b/nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_trylock.c
new file mode 100644
index 0000000..0148aca
--- /dev/null
+++ b/nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_trylock.c
@@ -0,0 +1,22 @@
+/* Elided version of pthread_mutex_trylock.
+   Copyright (C) 2011, 2012, 2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <elision-conf.h>
+#include "force-elision.h"
+
+#include "nptl/pthread_mutex_trylock.c"
diff --git a/nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_unlock.c b/nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_unlock.c
new file mode 100644
index 0000000..5af5c59
--- /dev/null
+++ b/nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_unlock.c
@@ -0,0 +1,19 @@
+/* Elided version of pthread_mutex_trylock.
+   Copyright (C) 2011, 2012, 2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include "nptl/pthread_mutex_unlock.c"
-- 
1.7.11.4


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