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net: don't wait for order-3 page allocation 

We saw excessive direct memory compaction triggered by skb_page_frag_refill.
This causes performance issues and add latency. Commit 5640f76858
introduces the order-3 allocation. According to the changelog, the order-3
allocation isn't a must-have but to improve performance. But direct memory
compaction has high overhead. The benefit of order-3 allocation can't
compensate the overhead of direct memory compaction.

This patch makes the order-3 page allocation atomic. If there is no memory
pressure and memory isn't fragmented, the alloction will still success, so we
don't sacrifice the order-3 benefit here. If the atomic allocation fails,
direct memory compaction will not be triggered, skb_page_frag_refill will
fallback to order-0 immediately, hence the direct memory compaction overhead is
avoided. In the allocation failure case, kswapd is waken up and doing
compaction, so chances are allocation could success next time.

alloc_skb_with_frags is the same.

The mellanox driver does similar thing, if this is accepted, we must fix
the driver too.

V3: fix the same issue in alloc_skb_with_frags as pointed out by Eric
V2: make the changelog clearer

Cc: Eric Dumazet <edumazet@google.com>
Cc: Chris Mason <clm@fb.com>
Cc: Debabrata Banerjee <dbavatar@gmail.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Shaohua Li 2015-06-11 16:50:48 -07:00 committed by David S. Miller
parent 0fae3bf018
commit fb05e7a89f
2 changed files with 2 additions and 2 deletions
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2
net/core/skbuff.c
View File

@ -4398,7 +4398,7 @@ struct sk_buff *alloc_skb_with_frags(unsigned long header_len,
while (order) { while (order) {
if (npages >= 1 << order) { if (npages >= 1 << order) {
page = alloc_pages(gfp_mask | page = alloc_pages((gfp_mask & ~__GFP_WAIT) |
__GFP_COMP | __GFP_COMP |
__GFP_NOWARN | __GFP_NOWARN |
__GFP_NORETRY, __GFP_NORETRY,

2
net/core/sock.c
View File

@ -1880,7 +1880,7 @@ bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
pfrag->offset = 0; pfrag->offset = 0;
if (SKB_FRAG_PAGE_ORDER) { if (SKB_FRAG_PAGE_ORDER) {
pfrag->page = alloc_pages(gfp | __GFP_COMP | pfrag->page = alloc_pages((gfp & ~__GFP_WAIT) | __GFP_COMP |
__GFP_NOWARN | __GFP_NORETRY, __GFP_NOWARN | __GFP_NORETRY,
SKB_FRAG_PAGE_ORDER); SKB_FRAG_PAGE_ORDER);
if (likely(pfrag->page)) { if (likely(pfrag->page)) {