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Message-ID: <20241102175115.1769468-5-xur@google.com>
Date: Sat, 2 Nov 2024 10:51:11 -0700
From: Rong Xu <xur@...gle.com>
To: Alice Ryhl <aliceryhl@...gle.com>, Andrew Morton <akpm@...ux-foundation.org>,
Arnd Bergmann <arnd@...db.de>, Bill Wendling <morbo@...gle.com>, Borislav Petkov <bp@...en8.de>,
Breno Leitao <leitao@...ian.org>, Brian Gerst <brgerst@...il.com>,
Dave Hansen <dave.hansen@...ux.intel.com>, David Li <davidxl@...gle.com>,
Han Shen <shenhan@...gle.com>, Heiko Carstens <hca@...ux.ibm.com>, "H. Peter Anvin" <hpa@...or.com>,
Ingo Molnar <mingo@...hat.com>, Jann Horn <jannh@...gle.com>, Jonathan Corbet <corbet@....net>,
Josh Poimboeuf <jpoimboe@...nel.org>, Juergen Gross <jgross@...e.com>,
Justin Stitt <justinstitt@...gle.com>, Kees Cook <kees@...nel.org>,
Masahiro Yamada <masahiroy@...nel.org>, "Mike Rapoport (IBM)" <rppt@...nel.org>,
Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>,
Nicolas Schier <nicolas@...sle.eu>, "Paul E. McKenney" <paulmck@...nel.org>,
Peter Zijlstra <peterz@...radead.org>, Rong Xu <xur@...gle.com>,
Sami Tolvanen <samitolvanen@...gle.com>, Thomas Gleixner <tglx@...utronix.de>,
Wei Yang <richard.weiyang@...il.com>, workflows@...r.kernel.org,
Miguel Ojeda <miguel.ojeda.sandonis@...il.com>, Maksim Panchenko <max4bolt@...il.com>,
"David S. Miller" <davem@...emloft.net>, Andreas Larsson <andreas@...sler.com>,
Yonghong Song <yonghong.song@...ux.dev>, Yabin Cui <yabinc@...gle.com>,
Krzysztof Pszeniczny <kpszeniczny@...gle.com>, Sriraman Tallam <tmsriram@...gle.com>,
Stephane Eranian <eranian@...gle.com>
Cc: x86@...nel.org, linux-arch@...r.kernel.org, sparclinux@...r.kernel.org,
linux-doc@...r.kernel.org, linux-kbuild@...r.kernel.org,
linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: [PATCH v7 4/7] Add markers for text_unlikely and text_hot sections
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 <shenhan@...gle.com>
Signed-off-by: Han Shen <shenhan@...gle.com>
Signed-off-by: Rong Xu <xur@...gle.com>
Suggested-by: Sriraman Tallam <tmsriram@...gle.com>
Tested-by: Yonghong Song <yonghong.song@...ux.dev>
Tested-by: Yabin Cui <yabinc@...gle.com>
Tested-by: Nathan Chancellor <nathan@...nel.org>
Reviewed-by: Kees Cook <kees@...nel.org>
---
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)
--
2.47.0.163.g1226f6d8fa-goog
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