From nobody Tue Dec 16 09:56:23 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F0EA921ABDC; Mon, 21 Apr 2025 21:46:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745272005; cv=none; b=jdvO8/guHXtR7Jwv9D1wIQT3bZJc2v1PJT4qDOeHahpBDCihOagHgdngY2gkjJvbXz4k1GSChCDegCWE4oVMihZXMN4huPIuPEbTlljQgRbsQBfASBCG11UWpB237ha+ULGQdEgos4jDkwEo1p93/4N8wooseVYmUPCvUCTIfIk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745272005; c=relaxed/simple; bh=ArFi6LYnws/zK5pbLN4Y6WDU1aVkoTA4UhqE31uFzpc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=iFyATc3O9uIv+GSCOZ0c+fvpUi7a4WoGb/Zf9mZ7UjcFMiiNpD+D//DrDA7Mv81hN4XILDQy/Ac8NwlhwqYtrENGO28i0jiRl256Ipmwg9PvYQ1YfuT9yC155nitp75ya5GbWDZ/ebFBfryQK1o9e7BVLs8s4PciX+y22ATKnzI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XFbitown; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="XFbitown" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 73373C4CEEA; Mon, 21 Apr 2025 21:46:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1745272004; bh=ArFi6LYnws/zK5pbLN4Y6WDU1aVkoTA4UhqE31uFzpc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XFbitownCgJkrcx4SgKZj55+9VkZsd8302JYCpb6h4fdy+5cl8LqwYAozlGxIB8kn i8TyXOvEL4Zk5eqWbbEf4HPXqiv1l/uw+Xrxwve1UKDCyo3DVvhqRrzc0XXGzMtB6l M3zIOhNOu8XAtaH5K9h1CTFIbhYst/OZ3UOn25PAM4asosE5/T2/jycBfnQkVwfwMl h3ImtZuj31sGZqtxKUXHKvQfMlp6tlI2y7JMv+o2ZvfhzwaYxX2fqzDw1Wn6Kq8kfg 177Gp8T3X0XqfGnZWlVGtJ6jDzU2d25Ubt571iq5tzzIJmwVdZwfZFGhJYOXQFyG0I FC+c4PrvOhnUQ== From: Jiri Olsa To: Oleg Nesterov , Peter Zijlstra , Andrii Nakryiko Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, x86@kernel.org, Song Liu , Yonghong Song , John Fastabend , Hao Luo , Steven Rostedt , Masami Hiramatsu , Alan Maguire , David Laight , =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= , Ingo Molnar Subject: [PATCH perf/core 11/22] selftests/bpf: Use 5-byte nop for x86 usdt probes Date: Mon, 21 Apr 2025 23:44:11 +0200 Message-ID: <20250421214423.393661-12-jolsa@kernel.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250421214423.393661-1-jolsa@kernel.org> References: <20250421214423.393661-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Using 5-byte nop for x86 usdt probes so we can switch to optimized uprobe them. Signed-off-by: Jiri Olsa --- tools/testing/selftests/bpf/sdt.h | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/bpf/sdt.h b/tools/testing/selftests/bp= f/sdt.h index 1fcfa5160231..1d62c06f5ddc 100644 --- a/tools/testing/selftests/bpf/sdt.h +++ b/tools/testing/selftests/bpf/sdt.h @@ -236,6 +236,13 @@ __extension__ extern unsigned long long __sdt_unsp; #define _SDT_NOP nop #endif =20 +/* Use 5 byte nop for x86_64 to allow optimizing uprobes. */ +#if defined(__x86_64__) +# define _SDT_DEF_NOP _SDT_ASM_5(990: .byte 0x0f, 0x1f, 0x44, 0x00, 0x00) +#else +# define _SDT_DEF_NOP _SDT_ASM_1(990: _SDT_NOP) +#endif + #define _SDT_NOTE_NAME "stapsdt" #define _SDT_NOTE_TYPE 3 =20 @@ -288,7 +295,7 @@ __extension__ extern unsigned long long __sdt_unsp; =20 #define _SDT_ASM_BODY(provider, name, pack_args, args, ...) \ _SDT_DEF_MACROS \ - _SDT_ASM_1(990: _SDT_NOP) \ + _SDT_DEF_NOP \ _SDT_ASM_3( .pushsection .note.stapsdt,_SDT_ASM_AUTOGROUP,"note") \ _SDT_ASM_1( .balign 4) \ _SDT_ASM_3( .4byte 992f-991f, 994f-993f, _SDT_NOTE_TYPE) \ --=20 2.49.0