This is a note to let you know that I've just added the patch titled
net: do not deplete pfmemalloc reserve
to the 4.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-do-not-deplete-pfmemalloc-reserve.patch
and it can be found in the queue-4.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Wed Apr 29 11:59:49 CEST 2015
From: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Wed, 22 Apr 2015 07:33:36 -0700
Subject: net: do not deplete pfmemalloc reserve
From: Eric Dumazet <edumazet@xxxxxxxxxx>
[ 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@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/core/skbuff.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -311,7 +311,11 @@ struct sk_buff *build_skb(void *data, un
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;
@@ -348,7 +352,8 @@ static struct page *__page_frag_refill(s
gfp_t gfp = gfp_mask;
if (order) {
- gfp_mask |= __GFP_COMP | __GFP_NOWARN | __GFP_NORETRY;
+ gfp_mask |= __GFP_COMP | __GFP_NOWARN | __GFP_NORETRY |
+ __GFP_NOMEMALLOC;
page = alloc_pages_node(NUMA_NO_NODE, gfp_mask, order);
nc->frag.size = PAGE_SIZE << (page ? order : 0);
}
Patches currently in stable-queue which might be from edumazet@xxxxxxxxxx are
queue-4.0/net-rfs-fix-crash-in-get_rps_cpus.patch
queue-4.0/net-fix-crash-in-build_skb.patch
queue-4.0/tcp-avoid-looping-in-tcp_send_fin.patch
queue-4.0/net-do-not-deplete-pfmemalloc-reserve.patch
queue-4.0/tcp-fix-possible-deadlock-in-tcp_send_fin.patch
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