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@xxxxxxxxxx>
CC: David S. Miller <davem@xxxxxxxxxxxxx>
CC: linux-kernel@xxxxxxxxxxxxxxx
CC: netdev@xxxxxxxxxxxxxxx
CC: netfilter-devel@xxxxxxxxxxxxxxx
---
include/linux/netdevice.h | 4 ++--
include/net/sock.h | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index cb0d5d0..f924ddc 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2801,7 +2801,7 @@ 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);
}
@@ -2851,7 +2851,7 @@ 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);
}
diff --git a/include/net/sock.h b/include/net/sock.h
index 255d3e0..fd15eb1 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -564,7 +564,7 @@ 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);
}
@@ -572,7 +572,7 @@ 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);
}
--
1.8.1.4
--
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