On Sat, Apr 26, 2014 at 01:17:55PM -0400, Richard Yao wrote:
> Modules installed outside of the kernel's build system should go into
> "%s/lib/modules/%s/extra", but at present, perf will only look at them
> when they are in "%s/lib/modules/%s/kernel". Lets encourage good
> citizenship by relaxing this requirement to "%s/lib/modules/%s". This
> way open source modules that are out-of-tree have no incentive to start
> populating a directory reserved for in-kernel modules and I can stop
> hex-editing my system's perf binary when profiling OSS out-of-tree
> modules.
>
> Feedback from Namhyung Kim correctly revealed that the hex-edits that I
> had been doing meant that perf was also traversing the build and source
> symlinks in %s/lib/modules/%s. That is undesireable, so we explicitly
> exclude them from traversal with a minor tweak to the traversal routine.
looks good to me, Namhyung?
thanks,
jirka
>
> Signed-off-by: Richard Yao <r...@gentoo.org>
> ---
> tools/perf/util/machine.c | 16 ++++++++++++----
> 1 file changed, 12 insertions(+), 4 deletions(-)
>
> diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
> index a53cd0b..27c2a5e 100644
> --- a/tools/perf/util/machine.c
> +++ b/tools/perf/util/machine.c
> @@ -717,7 +717,7 @@ static char *get_kernel_version(const char *root_dir)
> }
>
> static int map_groups__set_modules_path_dir(struct map_groups *mg,
> - const char *dir_name)
> + const char *dir_name, int depth)
> {
> struct dirent *dent;
> DIR *dir = opendir(dir_name);
> @@ -742,7 +742,15 @@ static int map_groups__set_modules_path_dir(struct
> map_groups *mg,
> !strcmp(dent->d_name, ".."))
> continue;
>
> - ret = map_groups__set_modules_path_dir(mg, path);
> + /* Do not follow top-level source and build symlinks */
> + if (depth == 0) {
> + if (!strcmp(dent->d_name, "source") ||
> + !strcmp(dent->d_name, "build"))
> + continue;
> + }
> +
> + ret = map_groups__set_modules_path_dir(mg, path,
> + depth + 1);
> if (ret < 0)
> goto out;
> } else {
> @@ -786,11 +794,11 @@ static int machine__set_modules_path(struct machine
> *machine)
> if (!version)
> return -1;
>
> - snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
> + snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s",
> machine->root_dir, version);
> free(version);
>
> - return map_groups__set_modules_path_dir(&machine->kmaps, modules_path);
> + return map_groups__set_modules_path_dir(&machine->kmaps, modules_path,
> 0);
> }
>
> static int machine__create_module(void *arg, const char *name, u64 start)
> --
> 1.8.3.2
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
