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| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2009-10-12 23:40:10 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-10-12 23:40:10 -0700 |
| commit | a2e2725541fad72416326798c2d7fa4dafb7d337 (patch) | |
| tree | 6174be11da607e83eb8efb3775114ad4d6e0ca3a /arch/xtensa | |
| parent | c05e85a06e376f6b6d59e71e5333d707e956d78b (diff) | |
| download | lwn-a2e2725541fad72416326798c2d7fa4dafb7d337.tar.gz lwn-a2e2725541fad72416326798c2d7fa4dafb7d337.zip | |
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.
. Rémi 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/xtensa')
| -rw-r--r-- | arch/xtensa/include/asm/unistd.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/xtensa/include/asm/unistd.h b/arch/xtensa/include/asm/unistd.h index c092c8fbb2cf..4e55dc763021 100644 --- a/arch/xtensa/include/asm/unistd.h +++ b/arch/xtensa/include/asm/unistd.h @@ -681,8 +681,10 @@ __SYSCALL(304, sys_signalfd, 3) __SYSCALL(305, sys_ni_syscall, 0) #define __NR_eventfd 306 __SYSCALL(306, sys_eventfd, 1) +#define __NR_recvmmsg 307 +__SYSCALL(307, sys_recvmmsg, 5) -#define __NR_syscall_count 307 +#define __NR_syscall_count 308 /* * sysxtensa syscall handler |