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6eac560407
android_kernel_xiaomi_sm8350/net/ipv4
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Andi Kleen 6eac560407 tcp: Skip empty hash buckets faster in /proc/net/tcp 
On most systems most of the TCP established/time-wait hash buckets are empty.
When walking the hash table for /proc/net/tcp their read locks would
always be aquired just to find out they're empty. This patch changes the code
to check first if the buckets have any entries before taking the lock, which
is much cheaper than taking a lock. Since the hash tables are large
this makes a measurable difference on processing /proc/net/tcp, 
especially on architectures with slow read_lock (e.g. PPC) 

On a 2GB Core2 system time cat /proc/net/tcp > /dev/null (with a mostly
empty hash table) goes from 0.046s to 0.005s.

On systems with slower atomics (like P4 or POWER4) or larger hash tables
(more RAM) the difference is much higher.

This can be noticeable because there are some daemons around who regularly
scan /proc/net/tcp.

Original idea for this patch from Marcus Meissner, but redone by me.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-08-28 01:08:02 -07:00
..
ipvs IPVS: Rename ip_vs_proto_ah.c to ip_vs_proto_ah_esp.c 2008-08-27 13:50:37 +10:00
netfilter nf_nat: use secure_ipv4_port_ephemeral() for NAT port randomization 2008-08-18 21:32:32 -07:00
af_inet.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2008-07-26 20:23:44 -07:00
ah4.c
arp.c mib: add net to NET_INC_STATS_BH 2008-07-16 20:31:16 -07:00
cipso_ipv4.c cipso: Relax too much careful cipso hash function. 2008-05-13 23:23:55 -07:00
datagram.c mib: add net to IP_INC_STATS_BH 2008-07-16 20:20:11 -07:00
devinet.c net: convert BUG_TRAP to generic WARN_ON 2008-07-25 21:43:18 -07:00
esp4.c ipsec: Interfamily IPSec BEET 2008-08-06 02:39:30 -07:00
fib_frontend.c netns: add namespace parameter to rt_cache_flush 2008-07-05 19:00:44 -07:00
fib_hash.c netns: add namespace parameter to rt_cache_flush 2008-07-05 19:00:44 -07:00
fib_lookup.h
fib_rules.c net: add fib_rules_ops to flush_cache method 2008-07-05 19:01:28 -07:00
fib_semantics.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-06-13 20:52:39 -07:00
fib_trie.c proc: consolidate per-net single-release callers 2008-07-18 04:07:44 -07:00
icmp.c mib: put icmpmsg statistics on struct net 2008-07-18 04:04:22 -07:00
igmp.c netns: Fix crash by making igmp per namespace 2008-08-13 16:15:57 -07:00
inet_connection_sock.c net: convert BUG_TRAP to generic WARN_ON 2008-07-25 21:43:18 -07:00
inet_diag.c net: remove CVS keywords 2008-06-11 21:00:38 -07:00
inet_fragment.c net: convert BUG_TRAP to generic WARN_ON 2008-07-25 21:43:18 -07:00
inet_hashtables.c net: convert BUG_TRAP to generic WARN_ON 2008-07-25 21:43:18 -07:00
inet_lro.c net/inet_lro: remove setting skb->ip_summed when not LRO-able 2008-06-27 20:09:00 -07:00
inet_timewait_sock.c net: convert BUG_TRAP to generic WARN_ON 2008-07-25 21:43:18 -07:00
inetpeer.c net: remove CVS keywords 2008-06-11 21:00:38 -07:00
ip_forward.c mib: add net to IP_INC_STATS_BH 2008-07-16 20:20:11 -07:00
ip_fragment.c net: convert BUG_TRAP to generic WARN_ON 2008-07-25 21:43:18 -07:00
ip_gre.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-05-25 23:26:10 -07:00
ip_input.c mib: put ip statistics on struct net 2008-07-18 04:02:42 -07:00
ip_options.c net: remove CVS keywords 2008-06-11 21:00:38 -07:00
ip_output.c net: convert BUG_TRAP to generic WARN_ON 2008-07-25 21:43:18 -07:00
ip_sockglue.c net: remove CVS keywords 2008-06-11 21:00:38 -07:00
ipcomp.c ipcomp: Fix warnings after ipcomp consolidation. 2008-07-27 03:59:24 -07:00
ipconfig.c netns: Use net_eq() to compare net-namespaces for optimization. 2008-07-19 22:34:43 -07:00
ipip.c net: remove CVS keywords 2008-06-11 21:00:38 -07:00
ipmr.c netns: Use net_eq() to compare net-namespaces for optimization. 2008-07-19 22:34:43 -07:00
Kconfig ipsec: ipcomp - Merge IPComp implementations 2008-07-25 02:54:40 -07:00
Makefile
netfilter.c [NETFILTER]: Add partial checksum validation helper 2008-04-14 11:15:49 +02:00
proc.c tcp: MD5: Use MIB counter instead of warning for MD5 mismatch. 2008-07-30 03:27:25 -07:00
protocol.c net: remove CVS keywords 2008-06-11 21:00:38 -07:00
raw.c mib: add net to IP_INC_STATS 2008-07-16 20:19:49 -07:00
route.c ipv4: Disable route secret interval on zero interval 2008-08-15 13:44:31 -07:00
syncookies.c syncookies: Make sure ECN is disabled 2008-07-26 02:21:54 -07:00
sysctl_net_ipv4.c net: Add missing extra2 parameter for ip_default_ttl sysctl 2008-08-03 14:06:44 -07:00
tcp_bic.c
tcp_cong.c tcp: Limit cwnd growth when deferring for GSO 2008-04-29 03:13:52 -07:00
tcp_cubic.c rename div64_64 to div64_u64 2008-05-01 08:03:58 -07:00
tcp_diag.c net: remove CVS keywords 2008-06-11 21:00:38 -07:00
tcp_highspeed.c
tcp_htcp.c
tcp_hybla.c net: fix returning void-valued expression warnings 2008-05-01 02:47:38 -07:00
tcp_illinois.c
tcp_input.c tcp: Add tcp_parse_aligned_timestamp 2008-08-23 05:12:29 -07:00
tcp_ipv4.c tcp: Skip empty hash buckets faster in /proc/net/tcp 2008-08-28 01:08:02 -07:00
tcp_lp.c
tcp_minisocks.c tcp: (whitespace only) fix confusing indentation 2008-08-07 20:27:45 -07:00
tcp_output.c tcp: Fix bitmask test in tcp_syn_options() 2008-07-21 18:45:34 -07:00
tcp_probe.c tcp: correct kcalloc usage 2008-07-10 16:51:32 -07:00
tcp_scalable.c
tcp_timer.c net: convert BUG_TRAP to generic WARN_ON 2008-07-25 21:43:18 -07:00
tcp_vegas.c net: fix returning void-valued expression warnings 2008-05-01 02:47:38 -07:00
tcp_vegas.h
tcp_veno.c net: fix returning void-valued expression warnings 2008-05-01 02:47:38 -07:00
tcp_westwood.c
tcp_yeah.c
tcp.c net: convert BUG_TRAP to generic WARN_ON 2008-07-25 21:43:18 -07:00
tunnel4.c [IPV4] TUNNEL4: Fix incoming packet length check for inter-protocol tunnel. 2008-06-05 04:02:33 +09:00
udp_impl.h net: change proto destroy method to return void 2008-06-14 17:04:49 -07:00
udp.c udp: Drop socket lock for encapsulated packets 2008-08-09 00:35:05 -07:00
udplite.c mib: put udplite statistics on struct net 2008-07-18 04:03:45 -07:00
xfrm4_input.c
xfrm4_mode_beet.c ipsec: Interfamily IPSec BEET 2008-08-06 02:39:30 -07:00
xfrm4_mode_transport.c
xfrm4_mode_tunnel.c xfrm: fix fragmentation for ipv4 xfrm tunnel 2008-06-17 16:38:23 -07:00
xfrm4_output.c
xfrm4_policy.c
xfrm4_state.c
xfrm4_tunnel.c