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Re: [PATCH 5/6] Add catch-all alloc retry probe.
- From: Alexandre Oliva <aoliva at redhat dot com>
- To: "Carlos O'Donell" <carlos at redhat dot com>
- Cc: libc-alpha at sourceware dot org, aj at suse dot com
- Date: Fri, 20 Sep 2013 13:15:26 -0300
- Subject: Re: [PATCH 5/6] Add catch-all alloc retry probe.
- Authentication-results: sourceware.org; auth=none
- References: <orob7o33xs dot fsf at livre dot home> <20130920023029 dot 9898 dot 44407 dot stgit at frit dot home> <523BC86A dot 9070301 at redhat dot com>
On Sep 20, 2013, "Carlos O'Donell" <carlos@redhat.com> wrote:
> On 09/19/2013 10:30 PM, Alexandre Oliva wrote:
> s/takes place/of an alternate arena./g.
> OK to commit with that change.
Thanks, here's what I've just pushed along with the other patches in the
set.
for ChangeLog
* malloc/arena.c (arena_get_retry): Add memory_arena_retry probe.
* manual/probes.texi: Document it.
---
malloc/arena.c | 1 +
manual/probes.texi | 12 ++++++++++++
2 files changed, 13 insertions(+)
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 50e0fc2..696525d 100644
--- a/manual/probes.texi
+++ b/manual/probes.texi
@@ -48,6 +48,18 @@ corresponding two-argument functions, so that in all of these probes the
user-requested allocation size is in @var{$arg1}.
@end deftp
+@deftp Probe memory_arena_retry (size_t @var{$arg1}, void *@var{$arg2})
+This probe is triggered within @code{arena_get_retry} (the function
+called to select the alternate arena in which to retry an allocation
+that failed on the first attempt), before the selection of an alternate
+arena. This probe is redundant, but much easier to use when it's not
+important to determine which of the various memory allocation functions
+is failing to allocate on the first try. Argument @var{$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 triggered when @code{malloc} allocates and initializes an
additional arena (not the main arena), but before the arena is assigned
--
Alexandre Oliva, freedom fighter http://FSFLA.org/~lxoliva/
You must be the change you wish to see in the world. -- Gandhi
Be Free! -- http://FSFLA.org/ FSF Latin America board member
Free Software Evangelist Red Hat Brazil Compiler Engineer