package/perf: migrate perf to use the new linux-tools infrastructure

Remove the perf package and add legacy handling.

[Thomas:
  - improve the Config.in.legacy help text
  - improve the comment explaining why we pass O= when building perf]

Signed-off-by: Romain Naour <romain.naour@openwide.fr>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/linux/Config.tools.in b/linux/Config.tools.in
index 008e68c5f4..24ef8cd743 100644
--- a/linux/Config.tools.in
+++ b/linux/Config.tools.in
@@ -8,4 +8,22 @@ config BR2_LINUX_KERNEL_TOOL_CPUPOWER
 	  cpupower is a collection of tools to examine and tune power
 	  saving related features of your processor.
 
+config BR2_LINUX_KERNEL_TOOL_PERF
+	bool "perf"
+	help
+	  perf (sometimes "Perf Events" or perf tools, originally
+	  "Performance Counters for Linux") - is a performance
+	  analyzing tool in Linux, available from kernel version
+	  2.6.31. User-space controlling utility, called 'perf' has
+	  git-like interface with subcommands. It is capable of
+	  statistical profiling of entire system (both kernel and user
+	  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'.
+
+	  https://perf.wiki.kernel.org/
+
 endmenu