diff mbox series

[bpf-next,3/3] bpf, x86: Inline bpf_kptr_xchg() on x86-64

Message ID 20231219135615.2656572-4-houtao@huaweicloud.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series bpf: inline bpf_kptr_xchg() | expand

Checks

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netdev/apply fail Patch does not apply to bpf-next
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Commit Message

Hou Tao Dec. 19, 2023, 1:56 p.m. UTC 
From: Hou Tao <houtao1@huawei.com>

x86-64 supports BPF_XCHG atomic operation. The implementation of xchg()
and atomic_xchg() are also the same, because both of these two APIs
use arch_xchg() to implement the exchange. So enabling the inlining of
bpf_kptr_xchg() on x86-64.

After the optimization, the performance of an artificial test which
fetches the pointers through bpf_kptr_xchg() and frees the pointers
through bpf_obj_drop() increases 4%.

Signed-off-by: Hou Tao <houtao1@huawei.com>
---
 arch/x86/net/bpf_jit_comp.c | 5 +++++
 1 file changed, 5 insertions(+)
diff mbox series

Patch

diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index 49dac4d22a7b..9466c979ef9a 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -3201,3 +3201,8 @@  void arch_bpf_stack_walk(bool (*consume_fn)(void *cookie, u64 ip, u64 sp, u64 bp
 #endif
 	WARN(1, "verification of programs using bpf_throw should have failed\n");
 }
+
+bool bpf_jit_supports_ptr_xchg(void)
+{
+	return true;
+}