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r12934@catbus: nickm | 2007-05-24 14:11:18 -0400

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When freeing slack buffers, free the buffers at the end of the freelist first.


svn:r10313
This commit is contained in:
Nick Mathewson 2007-05-24 18:12:41 +00:00
parent 79707437d9
commit 9aaf3d182f
1 changed files with 21 additions and 2 deletions
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23
src/or/buffers.c
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@ -259,18 +259,37 @@ buf_shrink_freelists(void)
for (j = 0; j < 2; ++j) {
free_mem_list_t *list = j ? &free_mem_list_16k : &free_mem_list_4k;
if (list->lowwater > list->slack) {
int i;
int i, n_to_skip, n_to_free;
char **ptr;
log_info(LD_GENERAL, "We haven't used %d/%d allocated %d-byte buffer "
"memory chunks since the last call; freeing all but %d of them",
list->lowwater, list->len, (int)list->chunksize, list->slack);
/* Skip over the slack and non-lowwater entries */
n_to_free = list->lowwater - list->slack;
n_to_skip = list->len - n_to_free;
for (ptr = &list->list, i = 0; i < n_to_skip; ++i) {
char *mem = *ptr;
tor_assert(mem);
ptr = (char**)mem;
}
/* And free the remaining entries. */
for (i = 0; i < n_to_free; ++i) {
char *mem = *ptr;
tor_assert(mem);
*ptr = *(char**)mem;
tor_free(mem);
--list->len;
}
#if 0
/* XXXX020 Put this code back if the above gives us nasty segfaults. */
for (i = list->slack; i < list->lowwater; ++i) {
/* XXXX we should really free the last few entries, not the first. */
char *mem = list->list;
tor_assert(mem);
list->list = *(char**)mem;
tor_free(mem);
--list->len;
}
#endif
}
list->lowwater = list->len;
}