diff options
| author | Eric Dumazet <edumazet@google.com> | 2015-04-22 07:33:36 -0700 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2015-05-11 07:07:58 -0400 |
| commit | cfe7befc7d598ad55d0010af03d0dc82ba808492 (patch) | |
| tree | 3c359536faba86faa8908e578a1bbce6749074c2 /net | |
| parent | b5635e4539d82648f109c45d7ac09e4a7b3719a3 (diff) | |
net: do not deplete pfmemalloc reserve
[ Upstream commit 79930f5892e134c6da1254389577fffb8bd72c66 ]
build_skb() should look at the page pfmemalloc status.
If set, this means page allocator allocated this page in the
expectation it would help to free other pages. Networking
stack can do that only if skb->pfmemalloc is also set.
Also, we must refrain using high order pages from the pfmemalloc
reserve, so __page_frag_refill() must also use __GFP_NOMEMALLOC for
them. Under memory pressure, using order-0 pages is probably the best
strategy.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/skbuff.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 17fd8dca921e..e278d6b721bc 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -309,7 +309,11 @@ struct sk_buff *build_skb(void *data, unsigned int frag_size) memset(skb, 0, offsetof(struct sk_buff, tail)); skb->truesize = SKB_TRUESIZE(size); - skb->head_frag = frag_size != 0; + if (frag_size) { + skb->head_frag = 1; + if (virt_to_head_page(data)->pfmemalloc) + skb->pfmemalloc = 1; + } atomic_set(&skb->users, 1); skb->head = data; skb->data = data; @@ -352,7 +356,8 @@ refill: gfp_t gfp = gfp_mask; if (order) - gfp |= __GFP_COMP | __GFP_NOWARN; + gfp |= __GFP_COMP | __GFP_NOWARN | + __GFP_NOMEMALLOC; nc->frag.page = alloc_pages(gfp, order); if (likely(nc->frag.page)) break; |