From patchwork Sat Oct 26 05:14:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rong Xu X-Patchwork-Id: 13852068 Received: from mail-yw1-f201.google.com (mail-yw1-f201.google.com [209.85.128.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9230B17D8BF for ; Sat, 26 Oct 2024 05:14:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729919666; cv=none; b=AJCwHxWKcrgKl0wsHesMIMnoIbr2siGS+KNczjiyn9Zo2QjnWY6+DKABdA0wERdhXS2fZDXb+LUtYTaf6vSoTRl7YtLDFSeg2o+uWfeg0dYAgZNj3y/AP16/Lq9XGOpd92FNlOQour2RfOQbgC/2LkMdaqxx0FVyvO4Y6FhaxFw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729919666; c=relaxed/simple; bh=tzMXMzN/wgMUOmEGyjDqmLEvBh2AhaCjj6RzEgw1Vr0=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=bOi50Mb5YGGLbipM82JXAQaKooKPESYT7CWVtbpgTdRS44FaAudVpRqJljp+N3aOjolLhveEqO+VcQ4K0KZPDn8RUjTUICuSkBl8rndrhbz/T+VZQ3ZFjyHJ2Zi9NI8SkCX3Zai87u+IO9qXpgQuvxrktBsa3P4GtLozIiwgFZE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--xur.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=tV8Tmlu+; arc=none smtp.client-ip=209.85.128.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--xur.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="tV8Tmlu+" Received: by mail-yw1-f201.google.com with SMTP id 00721157ae682-6e59dc7df64so33519447b3.1 for ; Fri, 25 Oct 2024 22:14:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1729919661; x=1730524461; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=u2CNgeIiMQMsQ3BQwy/JhDpCL0QGG7OlUJ2Ao2DLrpQ=; b=tV8Tmlu++RiNzMQDeOZFi1Hl/KAkGycV8oaWMAKribDkXYXF95YLFFjmvCRxxYj0c7 /AfBeD8rL3Ka125fCGaVFI+RTc1hJ6tqpWtNtk4tnPZogwtnRqch9cIc8x3UORE+gxS8 ceki0B53vmE6b3wDv7GklO3oRM/UlN3xdpXwfm9xAEIUikhnsCoud9CYM1tk4pTrcdgU tO8luHCp+D0+8OfaQWGzgs4YZOvN58C+YDbBpSdwE9w4XvJ+CrD6wRdfk4SJ3TnHP0MH U23T80G1BzFimn8qyVP6K7JrJUH2lV1OZtVyiDtkZbxepI6RvliFsOBsZ5BhaUX7OjyM BAxA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1729919661; x=1730524461; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=u2CNgeIiMQMsQ3BQwy/JhDpCL0QGG7OlUJ2Ao2DLrpQ=; b=KY5YkyIAORz+q13VzwlYJcwm3w6xg0DWVfS1fi1U3SZp5GAWQ5Ns8p62s7h1jAixLJ zYDSMVcGgsHg0ncIL8w8ShMroTkJcfagXTRgvzk+Y7gq9qvRtz4IaXxn+B+6gkrP9sr8 ErMtaU5+DnDLu7e9XD1c+ays5DMpO70IBuX+c9FZ73z1L3D9HSONY+bNlBjvBgDjl0NN byWCQwvR+8DF8s1SfR1xXFktKabbnlRie8/U/oKJ4j0beccc4Ii4TVAG+9q2WT57pE9i eViAdGGQPCpHluXQyRHFlM+mVb8Ymi+yh48NhKHPNgen5qtOiyj4lMbxorLJUk7wXbxO dB/g== X-Forwarded-Encrypted: i=1; AJvYcCVJCO0jPh2ZjJ8ZYBmZnEEQsuvTsN7/TFCfbfZ0qnK0YUbIirLT+E8wTsNnhef6CL4Xc78K9ia0faqQzQ4=@vger.kernel.org X-Gm-Message-State: AOJu0YywSgONxLdT5sQVx8FRnPFYB3w0wy4az3tAFVhgqfYefIszJLAC mdUxCw+tBCcThKBHf2Ng5CN+ZSB5OXkTZE5httPagJJNIMGyDsaxXD236W8utKb0Jw== X-Google-Smtp-Source: AGHT+IG4wzkxOGVXqJpc/NqCJl7J1Bo+g7i9iACOlnzSbC72EPPc9/I9m6FoCmV9xT7sOQL/GxBtQGI= X-Received: from xur.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:2330]) (user=xur job=sendgmr) by 2002:a05:690c:82c:b0:620:32ea:e1d4 with SMTP id 00721157ae682-6e9d870c0e4mr333647b3.0.1729919661525; Fri, 25 Oct 2024 22:14:21 -0700 (PDT) Date: Fri, 25 Oct 2024 22:14:06 -0700 In-Reply-To: <20241026051410.2819338-1-xur@google.com> Precedence: bulk X-Mailing-List: linux-kbuild@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241026051410.2819338-1-xur@google.com> X-Mailer: git-send-email 2.47.0.163.g1226f6d8fa-goog Message-ID: <20241026051410.2819338-5-xur@google.com> Subject: [PATCH v6 4/7] Add markers for text_unlikely and text_hot sections From: Rong Xu To: Alice Ryhl , Andrew Morton , Arnd Bergmann , Bill Wendling , Borislav Petkov , Breno Leitao , Brian Gerst , Dave Hansen , David Li , Han Shen , Heiko Carstens , "H. Peter Anvin" , Ingo Molnar , Jann Horn , Jonathan Corbet , Josh Poimboeuf , Juergen Gross , Justin Stitt , Kees Cook , Masahiro Yamada , "Mike Rapoport (IBM)" , Nathan Chancellor , Nick Desaulniers , Nicolas Schier , "Paul E. McKenney" , Peter Zijlstra , Rong Xu , Sami Tolvanen , Thomas Gleixner , Wei Yang , workflows@vger.kernel.org, Miguel Ojeda , Maksim Panchenko , "David S. Miller" , Andreas Larsson , Yonghong Song , Yabin Cui , Krzysztof Pszeniczny , Sriraman Tallam , Stephane Eranian Cc: x86@kernel.org, linux-arch@vger.kernel.org, sparclinux@vger.kernel.org, linux-doc@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev Add markers like __hot_text_start, __hot_text_end, __unlikely_text_start, and __unlikely_text_end which will be included in System.map. These markers indicate how the compiler groups functions, providing valuable information to developers about the layout and optimization of the code. Co-developed-by: Han Shen Signed-off-by: Han Shen Signed-off-by: Rong Xu Suggested-by: Sriraman Tallam Tested-by: Yonghong Song Tested-by: Yabin Cui Change-Id: Ie7688587adf89a14661ceca108680903b546d5d9 --- include/asm-generic/vmlinux.lds.h | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index fd901951549c0..e02973f3b4189 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -549,6 +549,16 @@ __cpuidle_text_end = .; \ __noinstr_text_end = .; +#define TEXT_UNLIKELY \ + __unlikely_text_start = .; \ + *(.text.unlikely .text.unlikely.*) \ + __unlikely_text_end = .; + +#define TEXT_HOT \ + __hot_text_start = .; \ + *(.text.hot .text.hot.*) \ + __hot_text_end = .; + /* * .text section. Map to function alignment to avoid address changes * during second ld run in second ld pass when generating System.map @@ -565,9 +575,9 @@ ALIGN_FUNCTION(); \ *(.text.asan.* .text.tsan.*) \ *(.text.unknown .text.unknown.*) \ - *(.text.unlikely .text.unlikely.*) \ + TEXT_UNLIKELY \ . = ALIGN(PAGE_SIZE); \ - *(.text.hot .text.hot.*) \ + TEXT_HOT \ *(TEXT_MAIN .text.fixup) \ NOINSTR_TEXT \ *(.ref.text)