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* mmap.c (backtrace_free_locked): Don't put more than 16 entries

on the free list.

Fixes #5
Fixes rust-lang/rust#29293
Fixes rust-lang/rust#37477
lib
Ian Lance Taylor 5 years ago
parent
commit
b0d690331d
  1. 24
      mmap.c

24
mmap.c

@ -69,11 +69,33 @@ struct backtrace_freelist_struct @@ -69,11 +69,33 @@ struct backtrace_freelist_struct
static void
backtrace_free_locked (struct backtrace_state *state, void *addr, size_t size)
{
/* Just leak small blocks. We don't have to be perfect. */
/* Just leak small blocks. We don't have to be perfect. Don't put
more than 16 entries on the free list, to avoid wasting time
searching when allocating a block. If we have more than 16
entries, leak the smallest entry. */
if (size >= sizeof (struct backtrace_freelist_struct))
{
size_t c;
struct backtrace_freelist_struct **ppsmall;
struct backtrace_freelist_struct **pp;
struct backtrace_freelist_struct *p;
c = 0;
ppsmall = NULL;
for (pp = &state->freelist; *pp != NULL; pp = &(*pp)->next)
{
if (ppsmall == NULL || (*pp)->size < (*ppsmall)->size)
ppsmall = pp;
++c;
}
if (c >= 16)
{
if (size <= (*ppsmall)->size)
return;
*ppsmall = (*ppsmall)->next;
}
p = (struct backtrace_freelist_struct *) addr;
p->next = state->freelist;
p->size = size;

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