diff options
author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2009-10-13 02:40:10 -0400 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2009-10-13 02:40:10 -0400 |
commit | a2e2725541fad72416326798c2d7fa4dafb7d337 (patch) | |
tree | 6174be11da607e83eb8efb3775114ad4d6e0ca3a /kernel | |
parent | c05e85a06e376f6b6d59e71e5333d707e956d78b (diff) |
net: Introduce recvmmsg socket syscall
Meaning receive multiple messages, reducing the number of syscalls and
net stack entry/exit operations.
Next patches will introduce mechanisms where protocols that want to
optimize this operation will provide an unlocked_recvmsg operation.
This takes into account comments made by:
. Paul Moore: sock_recvmsg is called only for the first datagram,
sock_recvmsg_nosec is used for the rest.
. Caitlin Bestler: recvmmsg now has a struct timespec timeout, that
works in the same fashion as the ppoll one.
If the underlying protocol returns a datagram with MSG_OOB set, this
will make recvmmsg return right away with as many datagrams (+ the OOB
one) it has received so far.
. RĂ©mi Denis-Courmont & Steven Whitehouse: If we receive N < vlen
datagrams and then recvmsg returns an error, recvmmsg will return
the successfully received datagrams, store the error and return it
in the next call.
This paves the way for a subsequent optimization, sk_prot->unlocked_recvmsg,
where we will be able to acquire the lock only at batch start and end, not at
every underlying recvmsg call.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/sys_ni.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c index e06d0b8d1951..f050ba85d420 100644 --- a/kernel/sys_ni.c +++ b/kernel/sys_ni.c | |||
@@ -48,8 +48,10 @@ cond_syscall(sys_shutdown); | |||
48 | cond_syscall(sys_sendmsg); | 48 | cond_syscall(sys_sendmsg); |
49 | cond_syscall(compat_sys_sendmsg); | 49 | cond_syscall(compat_sys_sendmsg); |
50 | cond_syscall(sys_recvmsg); | 50 | cond_syscall(sys_recvmsg); |
51 | cond_syscall(sys_recvmmsg); | ||
51 | cond_syscall(compat_sys_recvmsg); | 52 | cond_syscall(compat_sys_recvmsg); |
52 | cond_syscall(compat_sys_recvfrom); | 53 | cond_syscall(compat_sys_recvfrom); |
54 | cond_syscall(compat_sys_recvmmsg); | ||
53 | cond_syscall(sys_socketcall); | 55 | cond_syscall(sys_socketcall); |
54 | cond_syscall(sys_futex); | 56 | cond_syscall(sys_futex); |
55 | cond_syscall(compat_sys_futex); | 57 | cond_syscall(compat_sys_futex); |