tree fb7c5e29238657e89d33320091d8b8ae3d5f78e9
parent ad1e7b97b3adb91d46f3adb70a7867a50fc274cf
author Sowmini Varadhan <sowmini.varadhan@oracle.com> 1442004528 -0400
committer David S. Miller <davem@davemloft.net> 1442355902 -0700

rtnetlink: RTEXT_FILTER_SKIP_STATS support to avoid dumping inet/inet6 stats

Many commonly used functions like getifaddrs() invoke RTM_GETLINK
to dump the interface information, and do not need the
the AF_INET6 statististics that are always returned by default
from rtnl_fill_ifinfo().

Computing the statistics can be an expensive operation that impacts
scaling, so it is desirable to avoid this if the information is
not needed.

This patch adds a the RTEXT_FILTER_SKIP_STATS extended info flag that
can be passed with netlink_request() to avoid statistics computation
for the ifinfo path.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>