linux-kernel - [RFC][PATCH V2] GCOV: profile by modules

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Message-Id: <20200520083821.9602-1-gengcixi@gmail.com>
Date:   Wed, 20 May 2020 16:38:21 +0800
From:   gengcixi@...il.com
To:     oberpar@...ux.ibm.com, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org, jslaby@...e.com,
        gregkh@...uxfoundation.org, orsonzhai@...il.com,
        zhang.lyra@...il.com
Cc:     Cixi Geng <cixi.geng1@...soc.com>
Subject: [RFC][PATCH V2] GCOV: profile by modules

From: Cixi Geng <cixi.geng1@...soc.com>

---
Replace symbol GCOV_PROFILE_MODULES with GCOV_PROFILE_PREREQS
---
The CONFIG_GCOV_PROFILE_ALL will compile kernel by profiling entire
kernel which will lead to kernel run slower.Use GCOV_PROFILE_PREREQS
to control part of the kernel modules to open gcov.

Only add SERIAL_GCOV for an example.

Signed-off-by: Cixi Geng <cixi.geng1@...soc.com>
---
 drivers/tty/serial/Kconfig  |  6 ++++++
 drivers/tty/serial/Makefile |  1 +
 kernel/gcov/Kconfig         | 14 ++++++++++++++
 3 files changed, 21 insertions(+)

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index adf9e80e7dc9..964df1a2989c 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1566,3 +1566,9 @@ endmenu
 
 config SERIAL_MCTRL_GPIO
 	tristate
+
+config SERIAL_GCOV
+       bool "open gcov for serial"
+       depends on GCOV_PROFILE_PREREQS
+       help
+         Say Y here to enable gcov in serial.
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index d056ee6cca33..7be1202286d2 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -2,6 +2,7 @@
 #
 # Makefile for the kernel serial device drivers.
 #
+GCOV_PROFILE := $(CONFIG_SERIAL_GCOV)
 
 obj-$(CONFIG_SERIAL_CORE) += serial_core.o
 
diff --git a/kernel/gcov/Kconfig b/kernel/gcov/Kconfig
index 3941a9c48f83..91cc8f3c7c43 100644
--- a/kernel/gcov/Kconfig
+++ b/kernel/gcov/Kconfig
@@ -51,6 +51,20 @@ config GCOV_PROFILE_ALL
 	larger and run slower. Also be sure to exclude files from profiling
 	which are not linked to the kernel image to prevent linker errors.
 
+config GCOV_PROFILE_PREREQS
+	bool "Profile Kernel subsytem"
+	depends on !COMPILE_TEST
+	depends on GCOV_KERNEL
+	default n
+	help
+	This options activates profiling for the specified kernel modules.
+
+	If unsure, say N.
+
+	When some modules need Gcov data, enable this config, then configure
+	with gcov on the corresponding modules configs.The directories or files
+	of these modules will be added profiling flags after kernel compile.
+
 choice
 	prompt "Specify GCOV format"
 	depends on GCOV_KERNEL
-- 
2.17.1