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authorArnaldo Carvalho de Melo <acme@redhat.com>2009-10-12 23:40:10 -0700
committerDavid S. Miller <davem@davemloft.net>2009-10-12 23:40:10 -0700
commita2e2725541fad72416326798c2d7fa4dafb7d337 (patch)
tree6174be11da607e83eb8efb3775114ad4d6e0ca3a /arch/arm/kernel/calls.S
parentc05e85a06e376f6b6d59e71e5333d707e956d78b (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 'arch/arm/kernel/calls.S')
-rw-r--r--arch/arm/kernel/calls.S1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
index fafce1b5c69f..f58c1156e779 100644
--- a/arch/arm/kernel/calls.S
+++ b/arch/arm/kernel/calls.S
@@ -374,6 +374,7 @@
CALL(sys_pwritev)
CALL(sys_rt_tgsigqueueinfo)
CALL(sys_perf_event_open)
+/* 365 */ CALL(sys_recvmmsg)
#ifndef syscalls_counted
.equ syscalls_padding, ((NR_syscalls + 3) & ~3) - NR_syscalls
#define syscalls_counted