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author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2009-10-12 23:40:10 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2009-10-12 23:40:10 -0700 |
commit | a2e2725541fad72416326798c2d7fa4dafb7d337 (patch) | |
tree | 6174be11da607e83eb8efb3775114ad4d6e0ca3a /arch/x86/include/asm/unistd_64.h | |
parent | c05e85a06e376f6b6d59e71e5333d707e956d78b (diff) | |
download | blackbird-op-linux-a2e2725541fad72416326798c2d7fa4dafb7d337.tar.gz blackbird-op-linux-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/x86/include/asm/unistd_64.h')
-rw-r--r-- | arch/x86/include/asm/unistd_64.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/include/asm/unistd_64.h b/arch/x86/include/asm/unistd_64.h index 8d3ad0adbc68..4843f7ba754a 100644 --- a/arch/x86/include/asm/unistd_64.h +++ b/arch/x86/include/asm/unistd_64.h @@ -661,6 +661,8 @@ __SYSCALL(__NR_pwritev, sys_pwritev) __SYSCALL(__NR_rt_tgsigqueueinfo, sys_rt_tgsigqueueinfo) #define __NR_perf_event_open 298 __SYSCALL(__NR_perf_event_open, sys_perf_event_open) +#define __NR_recvmmsg 299 +__SYSCALL(__NR_recvmmsg, sys_recvmmsg) #ifndef __NO_STUBS #define __ARCH_WANT_OLD_READDIR |