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GNU C Library master sources branch lxoliva/malloc-probes-bz742038 created. glibc-2.18-120-g2d70a4e


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The branch, lxoliva/malloc-probes-bz742038 has been created
        at  2d70a4e190f791c8876845078ae388a7753e5582 (commit)

- Log -----------------------------------------------------------------
http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=2d70a4e190f791c8876845078ae388a7753e5582

commit 2d70a4e190f791c8876845078ae388a7753e5582
Author: Alexandre Oliva <aoliva@redhat.com>
Date:   Tue Sep 17 16:45:31 2013 -0300

    Add malloc probes for sbrk and heap resizing.
    
    for ChangeLog
    
    	* malloc/arena.c (new_heap): New memory_heap_new probe.
    	(grow_heap): New memory_heap_more probe.
    	(shrink_heap): New memory_heap_less probe.
    	(heap_trim): New memory_heap_free probe.
    	* malloc/malloc.c (sysmalloc): New memory_sbrk_more probe.
    	(systrim): New memory_sbrk_less probe.
    	* manual/probes.texi: Document them.

diff --git a/malloc/arena.c b/malloc/arena.c
index 9ace186..d81ed0d 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -581,6 +581,7 @@ new_heap(size_t size, size_t top_pad)
   h->size = size;
   h->mprotect_size = size;
   THREAD_STAT(stat_n_heaps++);
+  LIBC_PROBE (memory_heap_new, 2, h, h->size);
   return h;
 }
 
@@ -606,6 +607,7 @@ grow_heap(heap_info *h, long diff)
   }
 
   h->size = new_size;
+  LIBC_PROBE (memory_heap_more, 2, h, h->size);
   return 0;
 }
 
@@ -633,6 +635,7 @@ shrink_heap(heap_info *h, long diff)
   /*fprintf(stderr, "shrink %p %08lx\n", h, new_size);*/
 
   h->size = new_size;
+  LIBC_PROBE (memory_heap_less, 2, h, h->size);
   return 0;
 }
 
@@ -674,6 +677,7 @@ heap_trim(heap_info *heap, size_t pad)
       break;
     ar_ptr->system_mem -= heap->size;
     arena_mem -= heap->size;
+    LIBC_PROBE (memory_heap_free, 2, heap, heap->size);
     delete_heap(heap);
     heap = prev_heap;
     if(!prev_inuse(p)) { /* consolidate backward */
diff --git a/malloc/malloc.c b/malloc/malloc.c
index 5b4fcff..2938234 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -2448,8 +2448,10 @@ static void* sysmalloc(INTERNAL_SIZE_T nb, mstate av)
     below even if we cannot call MORECORE.
   */
 
-  if (size > 0)
+  if (size > 0) {
     brk = (char*)(MORECORE(size));
+    LIBC_PROBE (memory_sbrk_more, 2, brk, size);
+  }
 
   if (brk != (char*)(MORECORE_FAILURE)) {
     /* Call the `morecore' hook if necessary.  */
@@ -2747,6 +2749,8 @@ static int systrim(size_t pad, mstate av)
 	(*hook) ();
       new_brk = (char*)(MORECORE(0));
 
+      LIBC_PROBE (memory_sbrk_less, 2, new_brk, extra);
+
       if (new_brk != (char*)MORECORE_FAILURE) {
 	released = (long)(current_brk - new_brk);
 
diff --git a/manual/probes.texi b/manual/probes.texi
index cb81011..a93532a 100644
--- a/manual/probes.texi
+++ b/manual/probes.texi
@@ -24,6 +24,46 @@ arguments.
 These probes are designed to signal relatively unusual situations within
 the virtual memory subsystem of @theglibc{}.
 
+@deftp Probe memory_sbrk_more (void *@var{$arg1}, size_t @var{$arg2})
+This probe is hit after the main arena is extended by calling
+@code{sbrk}.  Argument @var{$arg1} is the additional size requested to
+@code{sbrk}, and @var{$arg2} is the pointer that marks the end of the
+@code{sbrk} area, returned in response to the request.
+@end deftp
+
+@deftp Probe memory_sbrk_less (void *@var{$arg1}, size_t @var{$arg2})
+This probe is hit after the main arena is shortened by calling
+@code{sbrk}.  Argument @var{$arg1} is the size released by @code{sbrk}
+(the positive value, rather than the negated number passed to
+@code{sbrk}), and @var{$arg2} is the pointer that marks the end of the
+@code{sbrk} area, returned in response to the request.
+@end deftp
+
+@deftp Probe memory_heap_new (void *@var{$arg1}, size_t @var{$arg2})
+This probe is hit after a new heap is @code{mmap}ed.  Argument
+@var{$arg1} is a pointer to the base of the memory area, where the
+@code{heap_info} data structure is held, and @var{$arg2} is the size of
+the heap.
+@end deftp
+
+@deftp Probe memory_heap_free (void *@var{$arg1}, size_t @var{$arg2})
+This probe is hit before (unlike the other sbrk and heap probes) a heap
+is completely un@code{mmap}ped.  Argument @var{$arg1} is a pointer to
+the heap, and @var{$arg2} is the size of the heap.
+@end deftp
+
+@deftp Probe memory_heap_less (void *@var{$arg1}, size_t @var{$arg2})
+This probe is hit after a trailing portion of an @code{mmap}ed heap is
+released.  Argument @var{$arg1} is a pointer to the heap, and
+@var{$arg2} is the new size of the heap.
+@end deftp
+
+@deftp Probe memory_heap_more (void *@var{$arg1}, size_t @var{$arg2})
+This probe is hit after a trailing portion of an @code{mmap}ed heap is
+extended.  Argument @var{$arg1} is a pointer to the heap, and
+@var{$arg2} is the new size of the heap.
+@end deftp
+
 @deftp Probe memory_malloc_retry (size_t @var{$arg1})
 @deftpx Probe memory_realloc_retry (size_t @var{$arg1}, void *@var{$arg2})
 @deftpx Probe memory_memalign_retry (size_t @var{$arg1}, size_t @var{$arg2})

http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=295e5c35ffbf500bb55f39e9ab3761738fab085c

commit 295e5c35ffbf500bb55f39e9ab3761738fab085c
Author: Alexandre Oliva <aoliva@redhat.com>
Date:   Tue Sep 17 16:45:31 2013 -0300

    Add catch-all alloc retry probe.
    
    for ChangeLog
    
    	* malloc/arena.c (arena_get_retry): Add memory_arena_retry probe.
    	* manual/probes.texi: Document it.

diff --git a/malloc/arena.c b/malloc/arena.c
index 89e8b92..9ace186 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -932,6 +932,7 @@ arena_get2(mstate a_tsd, size_t size, mstate avoid_arena)
 static mstate
 arena_get_retry (mstate ar_ptr, size_t bytes)
 {
+  LIBC_PROBE (memory_arena_retry, 2, bytes, ar_ptr);
   if(ar_ptr != &main_arena) {
     (void)mutex_unlock(&ar_ptr->mutex);
     ar_ptr = &main_arena;
diff --git a/manual/probes.texi b/manual/probes.texi
index f28f923..cb81011 100644
--- a/manual/probes.texi
+++ b/manual/probes.texi
@@ -44,6 +44,18 @@ two-argument functions, so that in all of these probes the
 user-requested allocation size is in @var{$arg1}.
 @end deftp
 
+@deftp Probe memory_arena_retry (size_t @var{$arg1}, void *@var{$arg2})
+This probe is hit within @code{arena_get_retry}, the function used by
+all of the corresponding functions above to select the alternate arena
+in which to retry the allocation, before the selection takes place.
+This probe is redundant, but much easier to use when it's not important
+to determine which memory allocation functions are failing to allocate
+in the first try.  Argument @var{$arg1} is the same as in the
+function-specific probes, except for extra room for padding introduced
+by functions that have to ensure stricter alignment.  Argument
+@var{$arg2} is the arena in which allocation failed.
+@end deftp
+
 @deftp Probe memory_arena_new (void *@var{$arg1}, size_t @var{$arg2})
 This probe is hit when @code{malloc} allocated and initialized an
 additional allocation arena (not the main arena), but before it is

http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=061d9d04bdc895811e9882aad982ecb000a56452

commit 061d9d04bdc895811e9882aad982ecb000a56452
Author: Alexandre Oliva <aoliva@redhat.com>
Date:   Tue Sep 17 16:45:31 2013 -0300

    Add probes for malloc retries.
    
    for ChangeLog
    
    	* malloc/malloc.c (__libc_malloc): Add memory_malloc_retry probe.
    	(__libc_realloc): Add memory_realloc_retry probe.
    	(__libc_memalign): Add memory_memalign_retry probe.
    	(__libc_valloc): Add memory_valloc_retry probe.
    	(__libc_pvalloc): Add memory_pvalloc_retry probe.
    	(__libc_calloc): Add memory_calloc_retry probe.
    	* manual/probes.texi: Document them.

diff --git a/malloc/malloc.c b/malloc/malloc.c
index c5b3c7c..5b4fcff 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -2856,6 +2856,7 @@ __libc_malloc(size_t bytes)
     return 0;
   victim = _int_malloc(ar_ptr, bytes);
   if(!victim) {
+    LIBC_PROBE (memory_malloc_retry, 1, bytes);
     ar_ptr = arena_get_retry(ar_ptr, bytes);
     if (__builtin_expect(ar_ptr != NULL, 1)) {
       victim = _int_malloc(ar_ptr, bytes);
@@ -2991,6 +2992,7 @@ __libc_realloc(void* oldmem, size_t bytes)
   if (newp == NULL)
     {
       /* Try harder to allocate memory in other arenas.  */
+      LIBC_PROBE (memory_realloc_retry, 2, bytes, oldmem);
       newp = __libc_malloc(bytes);
       if (newp != NULL)
 	{
@@ -3032,6 +3034,7 @@ __libc_memalign(size_t alignment, size_t bytes)
     return 0;
   p = _int_memalign(ar_ptr, alignment, bytes);
   if(!p) {
+    LIBC_PROBE (memory_memalign_retry, 2, bytes, alignment);
     ar_ptr = arena_get_retry (ar_ptr, bytes);
     if (__builtin_expect(ar_ptr != NULL, 1)) {
       p = _int_memalign(ar_ptr, alignment, bytes);
@@ -3075,6 +3078,7 @@ __libc_valloc(size_t bytes)
     return 0;
   p = _int_valloc(ar_ptr, bytes);
   if(!p) {
+    LIBC_PROBE (memory_valloc_retry, 1, bytes);
     ar_ptr = arena_get_retry (ar_ptr, bytes);
     if (__builtin_expect(ar_ptr != NULL, 1)) {
       p = _int_memalign(ar_ptr, pagesz, bytes);
@@ -3116,6 +3120,7 @@ __libc_pvalloc(size_t bytes)
   arena_get(ar_ptr, bytes + 2*pagesz + MINSIZE);
   p = _int_pvalloc(ar_ptr, bytes);
   if(!p) {
+    LIBC_PROBE (memory_pvalloc_retry, 1, bytes);
     ar_ptr = arena_get_retry (ar_ptr, bytes + 2*pagesz + MINSIZE);
     if (__builtin_expect(ar_ptr != NULL, 1)) {
       p = _int_memalign(ar_ptr, pagesz, rounded_bytes);
@@ -3192,6 +3197,7 @@ __libc_calloc(size_t n, size_t elem_size)
 	 av == arena_for_chunk(mem2chunk(mem)));
 
   if (mem == 0) {
+    LIBC_PROBE (memory_calloc_retry, 1, sz);
     av = arena_get_retry (av, sz);
     if (__builtin_expect(av != NULL, 1)) {
       mem = _int_malloc(av, sz);
diff --git a/manual/probes.texi b/manual/probes.texi
index 73b6158..f28f923 100644
--- a/manual/probes.texi
+++ b/manual/probes.texi
@@ -24,6 +24,26 @@ arguments.
 These probes are designed to signal relatively unusual situations within
 the virtual memory subsystem of @theglibc{}.
 
+@deftp Probe memory_malloc_retry (size_t @var{$arg1})
+@deftpx Probe memory_realloc_retry (size_t @var{$arg1}, void *@var{$arg2})
+@deftpx Probe memory_memalign_retry (size_t @var{$arg1}, size_t @var{$arg2})
+@deftpx Probe memory_valloc_retry (size_t @var{$arg1})
+@deftpx Probe memory_pvalloc_retry (size_t @var{$arg1})
+@deftpx Probe memory_calloc_retry (size_t @var{$arg1})
+These probes are hit when the corresponding functions fail to obtain the
+requested amount of memory from the arena in use, before it retries on
+another arena.  Argument @var{$arg1} is the amount of memory requested
+by the user; in the @code{calloc} case, that is the total size computed
+from both function arguments.  In the @code{realloc} case, @var{$arg2}
+is the pointer to the memory area being resized.  In the @code{memalign}
+case, @var{$arg2} is the alignment to be used for the request, which may
+be stricter than the value passed to the @code{memalign} function.
+
+Note that the argument order does NOT match that of the corresponding
+two-argument functions, so that in all of these probes the
+user-requested allocation size is in @var{$arg1}.
+@end deftp
+
 @deftp Probe memory_arena_new (void *@var{$arg1}, size_t @var{$arg2})
 This probe is hit when @code{malloc} allocated and initialized an
 additional allocation arena (not the main arena), but before it is

http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=e2f2acc1b77651287e6357fd4cc751fa47c7054e

commit e2f2acc1b77651287e6357fd4cc751fa47c7054e
Author: Alexandre Oliva <aoliva@redhat.com>
Date:   Tue Sep 17 16:45:30 2013 -0300

    Add probes for malloc arena changes.
    
    for ChangeLog
    
    	* malloc/arena.c (get_free_list): Add probe
    	memory_arena_reuse_free_list.
    	(reused_arena) [PER_THREAD]: Add probes memory_arena_reuse_wait
    	and memory_arena_reuse.
    	(arena_get2) [!PER_THREAD]: Likewise.
    	* malloc/malloc.c (__libc_realloc) [!PER_THREAD]: Add probe
    	memory_arena_reuse_realloc.
    	* manual/probes.texi: Document them.

diff --git a/malloc/arena.c b/malloc/arena.c
index 0822fc8..89e8b92 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -775,6 +775,7 @@ get_free_list (void)
 
       if (result != NULL)
 	{
+	  LIBC_PROBE (memory_arena_reuse_free_list, 1, result);
 	  (void)mutex_lock(&result->mutex);
 	  tsd_setspecific(arena_key, (void *)result);
 	  THREAD_STAT(++(result->stat_lock_loop));
@@ -811,9 +812,11 @@ reused_arena (mstate avoid_arena)
     result = result->next;
 
   /* No arena available.  Wait for the next in line.  */
+  LIBC_PROBE (memory_arena_reuse_wait, 3, &result->mutex, result, avoid_arena);
   (void)mutex_lock(&result->mutex);
 
  out:
+  LIBC_PROBE (memory_arena_reuse, 2, result, avoid_arena);
   tsd_setspecific(arena_key, (void *)result);
   THREAD_STAT(++(result->stat_lock_loop));
   next_to_use = result->next;
@@ -892,6 +895,7 @@ arena_get2(mstate a_tsd, size_t size, mstate avoid_arena)
       if (retried)
 	(void)mutex_unlock(&list_lock);
       THREAD_STAT(++(a->stat_lock_loop));
+      LIBC_PROBE (memory_arena_reuse, 2, a, a_tsd);
       tsd_setspecific(arena_key, (void *)a);
       return a;
     }
@@ -904,6 +908,7 @@ arena_get2(mstate a_tsd, size_t size, mstate avoid_arena)
      locks. */
   if(!retried && mutex_trylock(&list_lock)) {
     /* We will block to not run in a busy loop.  */
+    LIBC_PROBE (memory_arena_reuse_wait, 3, &list_lock, NULL, a_tsd);
     (void)mutex_lock(&list_lock);
 
     /* Since we blocked there might be an arena available now.  */
diff --git a/malloc/malloc.c b/malloc/malloc.c
index 8f1ddf3..c5b3c7c 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -2977,6 +2977,7 @@ __libc_realloc(void* oldmem, size_t bytes)
 #endif
 
 #if !defined PER_THREAD
+  LIBC_PROBE (memory_arena_reuse_realloc, 1, ar_ptr);
   /* As in malloc(), remember this arena for the next allocation. */
   tsd_setspecific(arena_key, (void *)ar_ptr);
 #endif
diff --git a/manual/probes.texi b/manual/probes.texi
index 37fd2f8..73b6158 100644
--- a/manual/probes.texi
+++ b/manual/probes.texi
@@ -33,6 +33,66 @@ located at @var{$arg1}, within a newly-allocated heap big enough to hold
 at least @var{$arg2} bytes.
 @end deftp
 
+@deftp Probe memory_arena_reuse (void *@var{$arg1}, void *@var{$arg2})
+This probe is hit when @code{malloc} has just selected an existing arena
+to reuse, and (temporarily) reserved it for exclusive use.  Argument
+@var{$arg1} is a pointer to the newly-selected arena, and @var{$arg2} is
+a pointer to the arena previously used by that thread.
+
+When per-thread arenas are enabled, this occurs within
+@code{reused_arena}, right after the mutex mentioned in probe
+@code{memory_arena_reuse_wait} is acquired; argument @var{$arg1} will
+point to the same arena.  In this configuration, this will usually only
+occur once per thread.  The exception is when a thread first selected
+the main arena, but a subsequent allocation from it fails: then, and
+only then, may we switch to another arena to retry that allocations, and
+for further allocations within that thread.
+
+When per-thread arenas are disabled, this occurs within
+@code{arena_get2}, whenever the mutex for the previously-selected arena
+cannot be immediately acquired.
+@end deftp
+
+@deftp Probe memory_arena_reuse_wait (void *@var{$arg1}, void *@var{$arg2}, void *@var{$arg3})
+This probe is hit when @code{malloc} is about to wait for an arena to
+become available for reuse.  Argument @var{$arg1} holds a pointer to the
+mutex the thread is going to wait on, @var{$arg2} is a pointer to a
+newly-chosen arena to be reused, and @var{$arg3} is a pointer to the
+arena previously used by that thread.
+
+When per-thread arenas are enabled, this occurs within
+@code{reused_arena}, when a thread first tries to allocate memory or
+needs a retry after a failure to allocate from the main arena, there
+isn't any free arena, the maximum number of arenas has been reached, and
+an existing arena was chosen for reuse, but its mutex could not be
+immediately acquired.  The mutex in @var{$arg1} is the mutex of the
+selected arena.
+
+When per-thread arenas are disabled, this occurs within
+@code{arena_get2}, when a thread first tries to allocate memory or the
+mutex of the arena it previously used could not be immediately acquired,
+and none of the existing arenas could be immediately reserved for
+exclusive use.  The mutex in @var{$arg1} is that of the list of arenas,
+and since the arena won't have been selected yet, @var{$arg2} will be
+@code{NULL}.
+@end deftp
+
+@deftp Probe memory_arena_reuse_free_list (void *@var{$arg1})
+This probe is hit when @code{malloc} has chosen an arena that is in the
+free list for use by a thread, within the @code{get_free_list} function.
+This probe is only available when @code{malloc} is configured to use
+per-thread arenas.  The argument @var{$arg1} holds a pointer to the
+selected arena.
+@end deftp
+
+@deftp Probe memory_arena_reuse_realloc (void *@var{$arg1})
+This probe is hit within @code{realloc}, as the arena of the current
+thread is changed to match that in which the given address was
+allocated.  This probe is not available when @code{malloc} is configured
+to use per-thread arenas.  The argument @var{$arg1} holds a pointer to
+the newly-selected arena.
+@end deftp
+
 @deftp Probe memory_mallopt (int @var{$arg1}, int @var{$arg2})
 This probe is hit when function @code{mallopt} is called to change
 @code{malloc} internal configuration parameters, before any change to

http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=24fe55e8d0420ce58c1786ee5c8cfef7bbd2f429

commit 24fe55e8d0420ce58c1786ee5c8cfef7bbd2f429
Author: Alexandre Oliva <aoliva@redhat.com>
Date:   Tue Sep 17 16:45:10 2013 -0300

    Add probes for all changes to malloc options.
    
    for ChangeLog
    
    	* malloc/malloc.c (__libc_free): Add
    	memory_mallopt_free_dyn_thresholds probe.
    	(__libc_mallopt): Add multiple memory_mallopt probes.
    	* manual/probes.texi: Document them.

diff --git a/malloc/malloc.c b/malloc/malloc.c
index 97ba34f..8f1ddf3 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -2896,6 +2896,8 @@ __libc_free(void* mem)
       {
 	mp_.mmap_threshold = chunksize (p);
 	mp_.trim_threshold = 2 * mp_.mmap_threshold;
+	LIBC_PROBE (memory_mallopt_free_dyn_thresholds, 2,
+		    mp_.mmap_threshold, mp_.trim_threshold);
       }
     munmap_chunk(p);
     return;
@@ -4701,19 +4703,25 @@ int __libc_mallopt(int param_number, int value)
 
   switch(param_number) {
   case M_MXFAST:
-    if (value >= 0 && value <= MAX_FAST_SIZE) {
-      set_max_fast(value);
-    }
+    if (value >= 0 && value <= MAX_FAST_SIZE)
+      {
+	LIBC_PROBE (memory_mallopt_mxfast, 2, value, get_max_fast ());
+	set_max_fast(value);
+      }
     else
       res = 0;
     break;
 
   case M_TRIM_THRESHOLD:
+    LIBC_PROBE (memory_mallopt_trim_threshold, 3, value,
+		mp_.trim_threshold, mp_.no_dyn_threshold);
     mp_.trim_threshold = value;
     mp_.no_dyn_threshold = 1;
     break;
 
   case M_TOP_PAD:
+    LIBC_PROBE (memory_mallopt_top_pad, 3, value,
+		mp_.top_pad, mp_.no_dyn_threshold);
     mp_.top_pad = value;
     mp_.no_dyn_threshold = 1;
     break;
@@ -4724,33 +4732,45 @@ int __libc_mallopt(int param_number, int value)
       res = 0;
     else
       {
+	LIBC_PROBE (memory_mallopt_mmap_threshold, 3, value,
+		    mp_.mmap_threshold, mp_.no_dyn_threshold);
 	mp_.mmap_threshold = value;
 	mp_.no_dyn_threshold = 1;
       }
     break;
 
   case M_MMAP_MAX:
+    LIBC_PROBE (memory_mallopt_mmap_max, 3, value,
+		mp_.n_mmaps_max, mp_.no_dyn_threshold);
     mp_.n_mmaps_max = value;
     mp_.no_dyn_threshold = 1;
     break;
 
   case M_CHECK_ACTION:
+    LIBC_PROBE (memory_mallopt_check_action, 2, value, check_action);
     check_action = value;
     break;
 
   case M_PERTURB:
+    LIBC_PROBE (memory_mallopt_perturb, 2, value, perturb_byte);
     perturb_byte = value;
     break;
 
 #ifdef PER_THREAD
   case M_ARENA_TEST:
     if (value > 0)
-      mp_.arena_test = value;
+      {
+	LIBC_PROBE (memory_mallopt_arena_test, 2, value, mp_.arena_test);
+	mp_.arena_test = value;
+      }
     break;
 
   case M_ARENA_MAX:
     if (value > 0)
-      mp_.arena_max = value;
+      {
+	LIBC_PROBE (memory_mallopt_arena_max, 2, value, mp_.arena_max);
+	mp_.arena_max = value;
+      }
     break;
 #endif
   }
diff --git a/manual/probes.texi b/manual/probes.texi
index b0c45cb..37fd2f8 100644
--- a/manual/probes.texi
+++ b/manual/probes.texi
@@ -39,3 +39,81 @@ This probe is hit when function @code{mallopt} is called to change
 the parameters is made.  The arguments @var{$arg1} and @var{$arg2} are
 the ones passed to the @code{mallopt} function.
 @end deftp
+
+@deftp Probe memory_mallopt_mxfast (int @var{$arg1}, int @var{$arg2})
+This probe is hit shortly after the @code{mallopt} probe, when the
+parameter to be changed is @code{M_MXFAST}, and the requested value is
+in an acceptable range.  Argument @var{$arg1} is the requested value,
+and @var{$arg2} is the previous value of this @code{malloc} parameter.
+@end deftp
+
+@deftp Probe memory_mallopt_trim_threshold (int @var{$arg1}, int @var{$arg2}, int @var{$arg3})
+This probe is hit shortly after the @code{mallopt} probe, when the
+parameter to be changed is @code{M_TRIM_THRESHOLD}.  Argument
+@var{$arg1} is the requested value, @var{$arg2} is the previous value of
+this @code{malloc} parameter, and @var{$arg3} is nonzero if dynamic
+threshold adjustments was already disabled.
+@end deftp
+
+@deftp Probe memory_mallopt_top_pad (int @var{$arg1}, int @var{$arg2}, int @var{$arg3})
+This probe is hit shortly after the @code{mallopt} probe, when the
+parameter to be changed is @code{M_TOP_PAD}.  Argument @var{$arg1} is
+the requested value, @var{$arg2} is the previous value of this
+@code{malloc} parameter, and @var{$arg3} is nonzero if dynamic threshold
+adjustments was already disabled.
+@end deftp
+
+@deftp Probe memory_mallopt_mmap_threshold (int @var{$arg1}, int @var{$arg2}, int @var{$arg3})
+This probe is hit shortly after the @code{mallopt} probe, when the
+parameter to be changed is @code{M_MMAP_THRESHOLD}, and the requested
+value is in an acceptable range.  Argument @var{$arg1} is the requested
+value, @var{$arg2} is the previous value of this @code{malloc}
+parameter, and @var{$arg3} is nonzero if dynamic threshold adjustments
+was already disabled.
+@end deftp
+
+@deftp Probe memory_mallopt_mmap_max (int @var{$arg1}, int @var{$arg2}, int @var{$arg3})
+This probe is hit shortly after the @code{mallopt} probe, when the
+parameter to be changed is @code{M_MMAP_MAX}.  Argument @var{$arg1} is
+the requested value, @var{$arg2} is the previous value of this
+@code{malloc} parameter, and @var{$arg3} is nonzero if dynamic threshold
+adjustments was already disabled.
+@end deftp
+
+@deftp Probe memory_mallopt_check_action (int @var{$arg1}, int @var{$arg2})
+This probe is hit shortly after the @code{mallopt} probe, when the
+parameter to be changed is @code{M_CHECK_ACTION}.  Argument @var{$arg1}
+is the requested value, and @var{$arg2} is the previous value of this
+@code{malloc} parameter.
+@end deftp
+
+@deftp Probe memory_mallopt_perturb (int @var{$arg1}, int @var{$arg2})
+This probe is hit shortly after the @code{mallopt} probe, when the
+parameter to be changed is @code{M_PERTURB}.  Argument @var{$arg1} is
+the requested value, and @var{$arg2} is the previous value of this
+@code{malloc} parameter.
+@end deftp
+
+@deftp Probe memory_mallopt_arena_test (int @var{$arg1}, int @var{$arg2})
+This probe is hit shortly after the @code{mallopt} probe, when the
+parameter to be changed is @code{M_ARENA_TEST}, and the requested value
+is in an acceptable range.  Argument @var{$arg1} is the requested value,
+and @var{$arg2} is the previous value of this @code{malloc} parameter.
+This probe is not available if @code{malloc} is compiled without
+per-thread arenas (@samp{-DPER_THREAD}).
+@end deftp
+
+@deftp Probe memory_mallopt_arena_max (int @var{$arg1}, int @var{$arg2})
+This probe is hit shortly after the @code{mallopt} probe, when the
+parameter to be changed is @code{M_ARENA_MAX}, and the requested value
+is in an acceptable range.  Argument @var{$arg1} is the requested value,
+and @var{$arg2} is the previous value of this @code{malloc} parameter.
+This probe is not available if @code{malloc} is compiled without
+per-thread arenas (@samp{-DPER_THREAD}).
+@end deftp
+
+@deftp Probe memory_mallopt_free_dyn_thresholds (int @var{$arg1}, int @var{$arg2})
+This probe is hit when function @code{free} decides to adjust the
+dynamic brk/mmap thresholds.  Argument @var{$arg1} and @var{$arg2} are
+the adjusted mmap and trim thresholds, respectively.
+@end deftp

http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=7b3bbef36daa055826d69fe855d2312cd15c9969

commit 7b3bbef36daa055826d69fe855d2312cd15c9969
Author: Alexandre Oliva <aoliva@redhat.com>
Date:   Tue Sep 17 16:44:42 2013 -0300

    Add first set of memory probes.
    
    for ChangeLog
    
    	* malloc/malloc.c: Include stap-probe.h.
    	(__libc_mallopt): Add memory_mallopt probe.
    	* malloc/arena.c (_int_new_arena): Add memory_arena_new probe.
    	* manual/probes.texi: New.
    	* manual/Makefile (chapters): Add probes.
    	* manual/threads.texi: Set next node.

diff --git a/malloc/arena.c b/malloc/arena.c
index 12a48ad..0822fc8 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -736,6 +736,7 @@ _int_new_arena(size_t size)
   top(a) = (mchunkptr)ptr;
   set_head(top(a), (((char*)h + h->size) - ptr) | PREV_INUSE);
 
+  LIBC_PROBE (memory_arena_new, 2, a, size);
   tsd_setspecific(arena_key, (void *)a);
   mutex_init(&a->mutex);
   (void)mutex_lock(&a->mutex);
diff --git a/malloc/malloc.c b/malloc/malloc.c
index f7718a9..97ba34f 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -1878,6 +1878,8 @@ static int perturb_byte;
 #define free_perturb(p, n) memset (p, perturb_byte & 0xff, n)
 
 
+#include <stap-probe.h>
+
 /* ------------------- Support for multiple arenas -------------------- */
 #include "arena.c"
 
@@ -4695,6 +4697,8 @@ int __libc_mallopt(int param_number, int value)
   /* Ensure initialization/consolidation */
   malloc_consolidate(av);
 
+  LIBC_PROBE (memory_mallopt, 2, param_number, value);
+
   switch(param_number) {
   case M_MXFAST:
     if (value >= 0 && value <= MAX_FAST_SIZE) {
diff --git a/manual/Makefile b/manual/Makefile
index 44c0fd4..7bb419a 100644
--- a/manual/Makefile
+++ b/manual/Makefile
@@ -42,7 +42,7 @@ chapters = $(addsuffix .texi, \
 		       message search pattern io stdio llio filesys	\
 		       pipe socket terminal syslog math arith time	\
 		       resource setjmp signal startup process job nss	\
-		       users sysinfo conf crypt debug threads)
+		       users sysinfo conf crypt debug threads probes)
 add-chapters = $(wildcard $(foreach d, $(add-ons), ../$d/$d.texi))
 appendices = lang.texi header.texi install.texi maint.texi platform.texi \
 	     contrib.texi
diff --git a/manual/probes.texi b/manual/probes.texi
new file mode 100644
index 0000000..b0c45cb
--- /dev/null
+++ b/manual/probes.texi
@@ -0,0 +1,41 @@
+@node Internal Probes
+@c @node Internal Probes, , POSIX Threads, Top
+@c %MENU% Probes to monitor libc internal behavior
+@chapter Internal probes
+
+In order to aid in debugging and monitoring @glibcadj{} internal
+behavior, @theglibc{} exposes nearly-zero-overhead probes as SystemTap
+process marks with the @code{libc} provider.
+
+These probes are not part of the @glibcadj{} stable ABI, and they are
+subject to change or removal across releases.  Our only promise with
+regard to them is that, if we find a need to remove or modify the
+arguments of a probe, the modified probe will have a different name, so
+that program monitors relying on the old probe will not get unexpected
+arguments.
+
+@menu
+* Memory Allocation Probes::  Probes in the memory allocation subsystem
+@end menu
+
+@node Memory Allocation Probes
+@section Memory Allocation Probes
+
+These probes are designed to signal relatively unusual situations within
+the virtual memory subsystem of @theglibc{}.
+
+@deftp Probe memory_arena_new (void *@var{$arg1}, size_t @var{$arg2})
+This probe is hit when @code{malloc} allocated and initialized an
+additional allocation arena (not the main arena), but before it is
+assigned to the running thread and inserted in the internal linked list
+of arenas.  The arena's @code{malloc_state} internal data structure is
+located at @var{$arg1}, within a newly-allocated heap big enough to hold
+at least @var{$arg2} bytes.
+@end deftp
+
+@deftp Probe memory_mallopt (int @var{$arg1}, int @var{$arg2})
+This probe is hit when function @code{mallopt} is called to change
+@code{malloc} internal configuration parameters, before any change to
+the parameters is made.  The arguments @var{$arg1} and @var{$arg2} are
+the ones passed to the @code{mallopt} function.
+@end deftp
diff --git a/manual/threads.texi b/manual/threads.texi
index a23ac26..6b7523c 100644
--- a/manual/threads.texi
+++ b/manual/threads.texi
@@ -1,5 +1,5 @@
 @node POSIX Threads
-@c @node POSIX Threads, , Cryptographic Functions, Top
+@c @node POSIX Threads, Intenal Probes, Cryptographic Functions, Top
 @chapter POSIX Threads
 @c %MENU% POSIX Threads
 @cindex pthreads

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