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Diffstat (limited to 'manual/probes.texi')
| -rw-r--r-- | manual/probes.texi | 40 |
1 files changed, 6 insertions, 34 deletions
diff --git a/manual/probes.texi b/manual/probes.texi index 7ba7bd32c3..437d10dbbe 100644 --- a/manual/probes.texi +++ b/manual/probes.texi @@ -23,9 +23,7 @@ arguments. @section Memory Allocation Probes These probes are designed to signal relatively unusual situations within -the virtual memory subsystem of @theglibc{}. The location and the -availability of some probes depend on whether per-thread arenas are -enabled (the default) or disabled at the time @theglibc{} is compiled. +the virtual memory subsystem of @theglibc{}. @deftp Probe memory_sbrk_more (void *@var{$arg1}, size_t @var{$arg2}) This probe is triggered after the main arena is extended by calling @@ -116,7 +114,7 @@ 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 +This occurs within @code{reused_arena}, right after the mutex mentioned in probe @code{memory_arena_reuse_wait} is acquired; argument @var{$arg1} will point to the same arena. In this configuration, this will usually only @@ -125,11 +123,6 @@ the main arena, but a subsequent allocation from it fails: then, and only then, may we switch to another arena to retry that allocations, and for further allocations within that thread. -When per-thread arenas are disabled, this occurs within -@code{arena_get2}, whenever the mutex for the previously-selected arena -cannot be immediately acquired. -@end deftp - @deftp Probe memory_arena_reuse_wait (void *@var{$arg1}, void *@var{$arg2}, void *@var{$arg3}) This probe is triggered when @code{malloc} is about to wait for an arena to become available for reuse. Argument @var{$arg1} holds a pointer to @@ -137,7 +130,7 @@ the mutex the thread is going to wait on, @var{$arg2} is a pointer to a newly-chosen arena to be reused, and @var{$arg3} is a pointer to the arena previously used by that thread. -When per-thread arenas are enabled, this occurs within +This occurs within @code{reused_arena}, when a thread first tries to allocate memory or needs a retry after a failure to allocate from the main arena, there isn't any free arena, the maximum number of arenas has been reached, and @@ -145,29 +138,10 @@ an existing arena was chosen for reuse, but its mutex could not be immediately acquired. The mutex in @var{$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{$arg1}) This probe is triggered when @code{malloc} has chosen an arena that is in the free list for use by a thread, within the @code{get_free_list} -function. This probe is only available when @code{malloc} is configured -to use per-thread arenas. The argument @var{$arg1} holds a pointer to -the selected arena. -@end deftp - -@deftp Probe memory_arena_reuse_realloc (void *@var{$arg1}) -This probe is triggered within @code{realloc}, as the arena of the -current thread is changed to match that in which the given address was -allocated. This probe is @emph{not} available when @code{malloc} is -configured to use per-thread arenas. The argument @var{$arg1} holds a -pointer to the newly-selected arena. +function. The argument @var{$arg1} holds a pointer to the selected arena. @end deftp @deftp Probe memory_mallopt (int @var{$arg1}, int @var{$arg2}) @@ -237,8 +211,7 @@ This probe is triggered shortly after the @code{memory_mallopt} probe, when the parameter to be changed is @code{M_ARENA_TEST}, and the requested value is in an acceptable range. Argument @var{$arg1} is the requested value, and @var{$arg2} is the previous value of this -@code{malloc} parameter. This probe is only available when per-thread -arenas are enabled. +@code{malloc} parameter. @end deftp @deftp Probe memory_mallopt_arena_max (int @var{$arg1}, int @var{$arg2}) @@ -246,8 +219,7 @@ This probe is triggered shortly after the @code{memory_mallopt} probe, when the parameter to be changed is @code{M_ARENA_MAX}, and the requested value is in an acceptable range. Argument @var{$arg1} is the requested value, and @var{$arg2} is the previous value of this -@code{malloc} parameter. This probe is only available when per-thread -arenas are enabled. +@code{malloc} parameter. @end deftp @deftp Probe memory_mallopt_free_dyn_thresholds (int @var{$arg1}, int @var{$arg2}) |