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MINOR: activity/memprofile: offer a function to unregister stale info

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There's actually a problem with memprofiles: the pool pointer is stored
in ->info but some pools are replaced during startup, such as the trash
pool, leaving a dangling pointer there.

Let's complete the API with a new function memprof_remove_stale_info()
that will remove all stale references to this info pointer. It's also
present when USE_MEMORY_PROFILING is not set so as to ease the job on
callers.

(cherry picked from commit 859341c1ec583c586ef36db0b63cd84f3843bfab)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
This commit is contained in:
Willy Tarreau 2024-11-21 11:27:52 +01:00 committed by Christopher Faulet
parent 992c3c2b67
commit 3b5cfb28e1
2 changed files with 23 additions and 0 deletions
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6
include/haproxy/activity.h
View File

@ -35,6 +35,12 @@ struct sched_activity *sched_activity_entry(struct sched_activity *array, const
#ifdef USE_MEMORY_PROFILING
struct memprof_stats *memprof_get_bin(const void *ra, enum memprof_method meth);
void memprof_remove_stale_info(const void *info);
#else
static inline void memprof_remove_stale_info(const void *info)
{
/* nothing to do */
}
#endif
#endif /* _HAPROXY_ACTIVITY_H */

17
src/activity.c
View File

@ -324,6 +324,23 @@ void free(void *ptr)
_HA_ATOMIC_ADD(&bin->free_tot, size_before);
}
/* remove info from entries matching <info>. This needs to be used by callers
* of pool_destroy() so that we don't keep a reference to a dead pool. Nothing
* is done if <info> is NULL.
*/
void memprof_remove_stale_info(const void *info)
{
int i;
if (!info)
return;
for (i = 0; i < MEMPROF_HASH_BUCKETS; i++) {
if (_HA_ATOMIC_LOAD(&memprof_stats[i].info) == info)
_HA_ATOMIC_STORE(&memprof_stats[i].info, NULL);
}
}
#endif // USE_MEMORY_PROFILING
/* Updates the current thread's statistics about stolen CPU time. The unit for