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authorArnaldo Carvalho de Melo <acme@redhat.com>2009-10-13 10:40:10 +0400
committerDavid S. Miller <davem@davemloft.net>2009-10-13 10:40:10 +0400
commita2e2725541fad72416326798c2d7fa4dafb7d337 (patch)
tree6174be11da607e83eb8efb3775114ad4d6e0ca3a /arch/ia64
parentc05e85a06e376f6b6d59e71e5333d707e956d78b (diff)
downloadlinux-a2e2725541fad72416326798c2d7fa4dafb7d337.tar.xz
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/ia64')
-rw-r--r--arch/ia64/kernel/entry.S1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S
index d0e7d37017b4..d75b872ca4dc 100644
--- a/arch/ia64/kernel/entry.S
+++ b/arch/ia64/kernel/entry.S
@@ -1806,6 +1806,7 @@ sys_call_table:
data8 sys_preadv
data8 sys_pwritev // 1320
data8 sys_rt_tgsigqueueinfo
+ data8 sys_recvmmsg
.org sys_call_table + 8*NR_syscalls // guard against failures to increase NR_syscalls
#endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */