On 09/11/2015 03:04 AM, Sowmini Varadhan wrote:
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.varad...@oracle.com> --- v2: David Miller comments: pass u32 ext_filter_mask down. include/net/rtnetlink.h | 3 ++- include/uapi/linux/rtnetlink.h | 1 + net/core/rtnetlink.c | 2 +- net/ipv4/devinet.c | 3 ++- net/ipv6/addrconf.c | 13 +++++++++---- 5 files changed, 15 insertions(+), 7 deletions(-)
Sowmini, Thanks for the patch which is more cleaner way without breaking current behaviour. [ Though RTEXT_FILTER_NEED_STATS flag with reverse effect would have helped immediately :)] /me waits for the RTEXT_FILTER_SKIP_STATS to be supported in gccgo/golang, so that it can be used in docker newNetlinkRequest() to exploit this. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
