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| author | Coco Li <lixiaoyan@google.com> | 2023-11-29 07:27:54 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-12-02 22:24:36 +0000 |
| commit | 18fd64d2542292713b0322e6815be059bdee440c (patch) | |
| tree | f42aebe19e9c791d92b0bdce2f176ace5601848d /net/core | |
| parent | aeb9ce058d7c6193dc41e06b3a5b29d22c446b14 (diff) | |
| download | linux-18fd64d2542292713b0322e6815be059bdee440c.tar.gz | |
netns-ipv4: reorganize netns_ipv4 fast path variables
Reorganize fast path variables on tx-txrx-rx order.
Fastpath cacheline ends after sysctl_tcp_rmem.
There are only read-only variables here. (write is on the control path
and not considered in this case)
Below data generated with pahole on x86 architecture.
Fast path variables span cache lines before change: 4
Fast path variables span cache lines after change: 2
Suggested-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Wei Wang <weiwan@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Coco Li <lixiaoyan@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/net_namespace.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c index f4183c4c1ec82f..cb8bcbff9e83a1 100644 --- a/net/core/net_namespace.c +++ b/net/core/net_namespace.c @@ -1099,11 +1099,56 @@ out: rtnl_set_sk_err(net, RTNLGRP_NSID, err); } +#ifdef CONFIG_NET_NS +static void __init netns_ipv4_struct_check(void) +{ + /* TX readonly hotpath cache lines */ + CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_tx, + sysctl_tcp_early_retrans); + CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_tx, + sysctl_tcp_tso_win_divisor); + CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_tx, + sysctl_tcp_tso_rtt_log); + CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_tx, + sysctl_tcp_autocorking); + CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_tx, + sysctl_tcp_min_snd_mss); + CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_tx, + sysctl_tcp_notsent_lowat); + CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_tx, + sysctl_tcp_limit_output_bytes); + CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_tx, + sysctl_tcp_min_rtt_wlen); + CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_tx, + sysctl_tcp_wmem); + CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_tx, + sysctl_ip_fwd_use_pmtu); + CACHELINE_ASSERT_GROUP_SIZE(struct netns_ipv4, netns_ipv4_read_tx, 33); + + /* TXRX readonly hotpath cache lines */ + CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_txrx, + sysctl_tcp_moderate_rcvbuf); + CACHELINE_ASSERT_GROUP_SIZE(struct netns_ipv4, netns_ipv4_read_txrx, 1); + + /* RX readonly hotpath cache line */ + CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_rx, + sysctl_ip_early_demux); + CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_rx, + sysctl_tcp_early_demux); + CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_rx, + sysctl_tcp_reordering); + CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_rx, + sysctl_tcp_rmem); + CACHELINE_ASSERT_GROUP_SIZE(struct netns_ipv4, netns_ipv4_read_rx, 18); +} +#endif + void __init net_ns_init(void) { struct net_generic *ng; #ifdef CONFIG_NET_NS + netns_ipv4_struct_check(); net_cachep = kmem_cache_create("net_namespace", sizeof(struct net), SMP_CACHE_BYTES, SLAB_PANIC|SLAB_ACCOUNT, NULL); |