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malloc: Account for all heaps in an arena in malloc_info [BZ #22439]

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This commit adds a "subheaps" field to the malloc_info output that
shows the number of heaps that were allocated to extend a non-main
arena.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
This commit is contained in:
Florian Weimer
2017-11-15 11:40:41 +01:00
parent 7a9368a117
commit 34eb41579c
3 changed files with 22 additions and 4 deletions
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17
malloc/malloc.c
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@ -5457,11 +5457,19 @@ __malloc_info (int options, FILE *fp)
size_t heap_size = 0;
size_t heap_mprotect_size = 0;
size_t heap_count = 0;
if (ar_ptr != &main_arena)
{
/* Iterate over the arena heaps from back to front. */
heap_info *heap = heap_for_ptr (top (ar_ptr));
heap_size = heap->size;
heap_mprotect_size = heap->mprotect_size;
do
{
heap_size += heap->size;
heap_mprotect_size += heap->mprotect_size;
heap = heap->prev;
++heap_count;
}
while (heap != NULL);
}
__libc_lock_unlock (ar_ptr->mutex);
@ -5499,8 +5507,9 @@ __malloc_info (int options, FILE *fp)
{
fprintf (fp,
"<aspace type=\"total\" size=\"%zu\"/>\n"
"<aspace type=\"mprotect\" size=\"%zu\"/>\n",
heap_size, heap_mprotect_size);
"<aspace type=\"mprotect\" size=\"%zu\"/>\n"
"<aspace type=\"subheaps\" size=\"%zu\"/>\n",
heap_size, heap_mprotect_size, heap_count);
total_aspace += heap_size;
total_aspace_mprotect += heap_mprotect_size;
}