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Changed kheap_getused so that it doesn't double-count the pages it's using for

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subpage allocation. We run into problems in determining memory leaks due to
kmalloc framgmentation, which can happen because of delayed thread cleanup.
This commit is contained in:
Scott Haseley 2016-03-25 11:09:15 -04:00
parent 922370ebd4
commit 25a1d7debc
1 changed files with 11 additions and 1 deletions
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12
kern/vm/kmalloc.c
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@ -828,13 +828,23 @@ unsigned long
kheap_getused(void) {
struct pageref *pr;
unsigned long total = 0;
unsigned int num_pages = 0, coremap_bytes = 0;
/* compute with interrupts off */
spinlock_acquire(&kmalloc_spinlock);
for (pr = allbase; pr != NULL; pr = pr->next_all) {
total += subpage_stats(pr, true);
num_pages++;
}
total += coremap_used_bytes();
coremap_bytes = coremap_used_bytes();
// Don't double-count the pages we're using for subpage allocation;
// we've already accounted for the used portion.
if (coremap_bytes > 0) {
total += coremap_bytes - (num_pages * PAGE_SIZE);
}
spinlock_release(&kmalloc_spinlock);
return total;