diff options
| author | Eric Dumazet <edumazet@google.com> | 2013-08-08 14:37:32 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-08-10 01:16:44 -0700 |
| commit | e370a7236321773245c5522d8bb299380830d3b2 (patch) | |
| tree | e374e13b5fcccdd9aa28fcb5ab0dd3df05b4d384 /include/net | |
| parent | 149479d019e06df5a7f4096f95c00cfb1380309c (diff) | |
af_unix: improve STREAM behavior with fragmented memory
unix_stream_sendmsg() currently uses order-2 allocations,
and we had numerous reports this can fail.
The __GFP_REPEAT flag present in sock_alloc_send_pskb() is
not helping.
This patch extends the work done in commit eb6a24816b247c
("af_unix: reduce high order page allocations) for
datagram sockets.
This opens the possibility of zero copy IO (splice() and
friends)
The trick is to not use skb_pull() anymore in recvmsg() path,
and instead add a @consumed field in UNIXCB() to track amount
of already read payload in the skb.
There is a performance regression for large sends
because of extra page allocations that will be addressed
in a follow-up patch, allowing sock_alloc_send_pskb()
to attempt high order page allocations.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/af_unix.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/af_unix.h b/include/net/af_unix.h index 05442df4ca89..a175ba4a7adb 100644 --- a/include/net/af_unix.h +++ b/include/net/af_unix.h @@ -35,6 +35,7 @@ struct unix_skb_parms { #ifdef CONFIG_SECURITY_NETWORK u32 secid; /* Security ID */ #endif + u32 consumed; }; #define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb)) |