leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity
9451980a66
linux/net
History
Alexander Duyck 9451980a66 net: Use cached copy of pfmemalloc to avoid accessing page 
While testing I found that the testing for pfmemalloc in build_skb was
rather expensive.  I found the issue to be two-fold.  First we have to get
from the virtual address to the head page and that comes at the cost of
something like 11 cycles.  Then there is the cost for reading pfmemalloc out
of the head page which can be cache cold due to the fact that
put_page_testzero is likely invalidating the cache-line on one or more
CPUs as the fragments can be shared.

To avoid this extra expense I have added a pfmemalloc member to the
netdev_alloc_cache.  I then pushed pieces of __alloc_rx_skb into
__napi_alloc_skb and __netdev_alloc_skb so that I could rewrite them to
make use of the cached pfmemalloc value.  The result is that my perf traces
show a reduction from 9.28% overhead to 3.7% for the code covered by
build_skb, __alloc_rx_skb, and __napi_alloc_skb when performing a test with
the packet being dropped instead of being handed to napi_gro_receive.

Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-05-12 10:39:26 -04:00
..
6lowpan 6lowpan: nhc: add other known rfc6282 compressions 2015-02-14 23:08:44 +01:00
9p 9p: patches for 4.1 merge window 2015-04-18 17:45:30 -04:00
802 net: Kill dev_rebuild_header 2015-03-02 16:43:41 -05:00
8021q vlan: implement ndo_get_iflink 2015-04-02 14:05:00 -04:00
appletalk net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
atm net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
ax25 net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
batman-adv dev: introduce dev_get_iflink() 2015-04-02 14:04:59 -04:00
bluetooth net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
bridge ebtables: Use eth_proto_is_802_3 2015-05-05 19:24:42 -04:00
caif net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
can net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
ceph net: Add a struct net parameter to sock_create_kern 2015-05-11 10:50:17 -04:00
core net: Use cached copy of pfmemalloc to avoid accessing page 2015-05-12 10:39:26 -04:00
dcb net/dcb: Add IEEE QCN attribute 2015-03-06 21:50:02 -05:00
dccp inet: fix possible panic in reqsk_queue_unlink() 2015-04-24 11:39:15 -04:00
decnet net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
dns_resolver
dsa net: dsa: Add lockdep class to tx queues to avoid lockdep splat 2015-05-09 16:05:54 -04:00
ethernet etherdev: Fix sparse error, make test usable by other functions 2015-05-05 19:24:42 -04:00
hsr net/hsr: Fix NULL pointer dereference and refcnt bugs when deleting a HSR interface. 2015-03-01 13:40:23 -05:00
ieee802154 net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
ipv4 net: Modify sk_alloc to not reference count the netns of kernel sockets. 2015-05-11 10:50:18 -04:00
ipv6 net: Modify sk_alloc to not reference count the netns of kernel sockets. 2015-05-11 10:50:18 -04:00
ipx net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
irda net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
iucv net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
key net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
l2tp net: Modify sk_alloc to not reference count the netns of kernel sockets. 2015-05-11 10:50:18 -04:00
lapb
llc net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
mac80211 mac80211: add missing documentation for rate_ctrl_lock 2015-05-06 16:00:32 +02:00
mac802154 mac802154: cleanup concurrent check 2015-03-27 19:18:50 +01:00
mpls mpls: Prevent use of implicit NULL label as outgoing label 2015-04-22 14:24:54 -04:00
netfilter net: Modify sk_alloc to not reference count the netns of kernel sockets. 2015-05-11 10:50:18 -04:00
netlabel netlink: implement nla_put_in_addr and nla_put_in6_addr 2015-03-31 13:58:35 -04:00
netlink netlink: Create kernel netlink sockets in the proper network namespace 2015-05-11 10:50:18 -04:00
netrom net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
nfc net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
openvswitch openvswitch: Use eth_proto_is_802_3 2015-05-05 19:24:42 -04:00
packet net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
phonet net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
rds net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
rfkill Last round of updates for net-next: 2015-02-04 14:57:45 -08:00
rose net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
rxrpc net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
sched net: sched: deprecate enqueue_root() 2015-05-11 14:17:32 -04:00
sctp net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
sunrpc NFS client updates for Linux 4.1 2015-04-26 17:33:59 -07:00
switchdev switchdev: fix stp update API to work with layered netdevices 2015-03-23 16:44:56 -04:00
tipc net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
unix net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
vmw_vsock net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
wimax
wireless cfg80211: change GO_CONCURRENT to IR_CONCURRENT for STA 2015-05-06 15:50:02 +02:00
x25 net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
xfrm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-04-14 15:44:14 -04:00
compat.c net: switch importing msghdr from userland to {compat_,}import_iovec() 2015-04-09 00:02:26 -04:00
Kconfig kconfig: use bool instead of boolean for type definition attributes 2015-01-07 13:08:04 +01:00
Makefile mpls: Refactor how the mpls module is built 2015-03-04 00:26:06 -05:00
socket.c net: Add a struct net parameter to sock_create_kern 2015-05-11 10:50:17 -04:00
sysctl_net.c