[Buildroot] [PATCHv2 1/3] linux: automatically set CONFIG_PERF_EVENTS when perf is enabled
Thomas De Schampheleire
thomas.de_schampheleire at nokia.com
Thu Jul 5 07:56:51 UTC 2018
From: Jan Heylen <jan.heylen at nokia.com>
Perf profiling cannot be used if CONFIG_PERF_EVENTS is not enabled in the
kernel configuration. Similar to other tools, like ktap, we can enable the
right options automatically.
Signed-off-by: Jan Heylen <jan.heylen at nokia.com>
Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire at nokia.com>
---
linux/linux.mk | 2 ++
package/linux-tools/Config.in | 8 +++++---
2 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/linux/linux.mk b/linux/linux.mk
index 6b5f5344ed..7f4c916671 100644
--- a/linux/linux.mk
+++ b/linux/linux.mk
@@ -292,6 +292,8 @@ define LINUX_KCONFIG_FIXUP_CMDS
$(call KCONFIG_ENABLE_OPT,CONFIG_ENABLE_DEFAULT_TRACERS,$(@D)/.config)
$(call KCONFIG_ENABLE_OPT,CONFIG_PERF_EVENTS,$(@D)/.config)
$(call KCONFIG_ENABLE_OPT,CONFIG_FUNCTION_TRACER,$(@D)/.config))
+ $(if $(BR2_PACKAGE_LINUX_TOOLS_PERF),
+ $(call KCONFIG_ENABLE_OPT,CONFIG_PERF_EVENTS,$(@D)/.config))
$(if $(BR2_PACKAGE_SYSTEMD),
$(call KCONFIG_ENABLE_OPT,CONFIG_CGROUPS,$(@D)/.config)
$(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,$(@D)/.config)
diff --git a/package/linux-tools/Config.in b/package/linux-tools/Config.in
index 2527c90257..349dc6bf0d 100644
--- a/package/linux-tools/Config.in
+++ b/package/linux-tools/Config.in
@@ -47,9 +47,11 @@ config BR2_PACKAGE_LINUX_TOOLS_PERF
code), single CPU or severals threads.
This will build and install the userspace 'perf'
- command. It is up to the user to ensure that the kernel
- configuration has all the suitable options enabled to allow a
- proper operation of 'perf'.
+ command.
+
+ Your kernel must have CONFIG_PERF_EVENTS enabled to use perf
+ profiling. Buildroot automatically enables this in the kernel
+ configuration.
https://perf.wiki.kernel.org/
--
2.16.4
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