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net: add scheduling point in recvmmsg/sendmmsg

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Applications often have to reduce number of datagrams
they receive or send per system call to avoid starvation problems.

Really the kernel should take care of this by using cond_resched(),
so that applications can experiment bigger batch sizes.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2016-01-08 08:37:20 -08:00 committed by David S. Miller
parent 3d171f3907
commit a78cb84c62
1 changed files with 2 additions and 0 deletions
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2
net/socket.c
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@ -2041,6 +2041,7 @@ int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
if (err)
break;
++datagrams;
cond_resched();
}
fput_light(sock->file, fput_needed);
@ -2236,6 +2237,7 @@ int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
/* Out of band data, return right away */
if (msg_sys.msg_flags & MSG_OOB)
break;
cond_resched();
}
out_put: