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net: force inlining of netif_tx_start/stop_queue, sock_hold, __sock_put 

Sometimes gcc mysteriously doesn't inline
very small functions we expect to be inlined. See
    https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66122
Arguably, gcc should do better, but gcc people aren't willing
to invest time into it, asking to use __always_inline instead.

With this .config:
http://busybox.net/~vda/kernel_config_OPTIMIZE_INLINING_and_Os,
the following functions get deinlined many times.

netif_tx_stop_queue: 207 copies, 590 calls:
	55                      push   %rbp
	48 89 e5                mov    %rsp,%rbp
	f0 80 8f e0 01 00 00 01 lock orb $0x1,0x1e0(%rdi)
	5d                      pop    %rbp
	c3                      retq

netif_tx_start_queue: 47 copies, 111 calls
	55                      push   %rbp
	48 89 e5                mov    %rsp,%rbp
	f0 80 a7 e0 01 00 00 fe lock andb $0xfe,0x1e0(%rdi)
	5d                      pop    %rbp
	c3                      retq

sock_hold: 39 copies, 124 calls
	55                      push   %rbp
	48 89 e5                mov    %rsp,%rbp
	f0 ff 87 80 00 00 00    lock incl 0x80(%rdi)
	5d                      pop    %rbp
	c3                      retq

__sock_put: 6 copies, 13 calls
	55                      push   %rbp
	48 89 e5                mov    %rsp,%rbp
	f0 ff 8f 80 00 00 00    lock decl 0x80(%rdi)
	5d                      pop    %rbp
	c3                      retq

This patch fixes this via s/inline/__always_inline/.

Code size decrease after the patch is ~2.5k:

    text      data      bss       dec     hex filename
56719876  56364551 36196352 149280779 8e5d80b vmlinux_before
56717440  56364551 36196352 149278343 8e5ce87 vmlinux

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
CC: David S. Miller <davem@davemloft.net>
CC: linux-kernel@vger.kernel.org
CC: netdev@vger.kernel.org
CC: netfilter-devel@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Denys Vlasenko 2016-04-08 17:51:54 +02:00 committed by David S. Miller
parent bf91795e4a
commit f9a7cbbf18
2 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/netdevice.h
View File

@ -2787,7 +2787,7 @@ static inline void netif_tx_schedule_all(struct net_device *dev)
netif_schedule_queue(netdev_get_tx_queue(dev, i));
}
static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
static __always_inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
{
clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
}
@ -2837,7 +2837,7 @@ static inline void netif_tx_wake_all_queues(struct net_device *dev)
}
}
static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
static __always_inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
{
set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
}

4
include/net/sock.h
View File

@ -569,7 +569,7 @@ static inline bool __sk_del_node_init(struct sock *sk)
modifications.
*/
static inline void sock_hold(struct sock *sk)
static __always_inline void sock_hold(struct sock *sk)
{
atomic_inc(&sk->sk_refcnt);
}
@ -577,7 +577,7 @@ static inline void sock_hold(struct sock *sk)
/* Ungrab socket in the context, which assumes that socket refcnt
cannot hit zero, f.e. it is true in context of any socketcall.
*/
static inline void __sock_put(struct sock *sk)
static __always_inline void __sock_put(struct sock *sk)
{
atomic_dec(&sk->sk_refcnt);
}