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When trying to perform a custom uprobe recording on a target with perf
built by buildroot, the recording step fails as perf can not record
uprobes without libtraceevent support:
$ perf probe -x linked_list insert_name index
Target program is compiled without optimization. Skipping prologue.
Probe on address 0x808 to force probing at the function entry.
Added new event:
probe_linked_list:insert_name (on insert_name in /root/gdb/linked_list with index)
perf is not linked with libtraceevent, to use the new probe you can use tracefs:
cd /sys/kernel/tracing/
echo 1 > events/probe_linked_list/insert_name/enable
echo 1 > tracing_on
cat trace_pipe
Before removing the probe, echo 0 > events/probe_linked_list/insert_name/enable
$ perf record -e probe_linked_list:insert_name ./linked_list
event syntax error: 'probe_linked_list:insert_name'
\___ unsupported tracepoint
libtraceevent is necessary for tracepoint support
Run 'perf list' for a list of valid events
Usage: perf record [<options>] [<command>]
or: perf record [<options>] -- <command> [<options>]
-e, --event <event> event selector. use 'perf list' to list available events
libtraceevent support for perf has been disabled with commit
b4ab45a5c1 ("package/linux-tools: disable libtracevent detection")
because there was no libtraceevent package in buildroot to replace the
former libtraceevent removed from the kernel sources. Since then, commit
1474f1b34b ("package/libtraceevent: new package") has introduced a
libtraceevent package. We can then expose again the possibility to build
perf with libtraceevent support.
Make buildroot perf makefile detect if libtraceevent package has been
enabled, and if so, allow to build perf with libtraceevent support.
Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Tested-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on OFTC IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches