d/freebsd-skq
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When searching for a suitable block of memory on the free list,

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skip blocks that are too big by a factor of two or greater. This
avoids some cases of extremely inefficient memory use that can occur
when large (e.g. 64k) blocks on the free list get used when allocating
a 4k chunk of 64-byte fragments. Because fragments have their own
free list, the 60k difference got lost forever every time.
This commit is contained in:
iedowse 2004-08-02 13:59:02 +00:00
parent 5b775a536b
commit 6d68eec474
1 changed files with 2 additions and 1 deletions
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3
sys/dev/usb/usb_mem.c
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@ -142,7 +142,8 @@ usb_block_allocmem(bus_dma_tag_t tag, size_t size, size_t align,
s = splusb();
/* First check the free list. */
for (p = LIST_FIRST(&usb_blk_freelist); p; p = LIST_NEXT(p, next)) {
if (p->tag == tag && p->size >= size && p->align >= align) {
if (p->tag == tag && p->size >= size && p->size < size * 2 &&
p->align >= align) {
LIST_REMOVE(p, next);
usb_blk_nfree--;
splx(s);