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Update documentation after dropping PER_THREAD conditional.

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In probes documentation we described what happens when PER_THREAD is
disabled which is now not relevant.
This commit is contained in:
Ondřej Bílka 2013-12-18 11:16:47 +01:00
parent 1818483b15
commit 4d84e6addd
2 changed files with 11 additions and 34 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2013-12-18 Ondřej Bílka <neleai@seznam.cz>
* manual/probes.texi: Remove cases when per-thread arenas are
disabled.
2013-12-18 Andreas Schwab <schwab@suse.de>
* sysdeps/i386/i686/multiarch/strstr.c: Remove.

40
manual/probes.texi
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@ -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})