[tip:perf/core] perf config: Document 'buildid.dir' variable in man page

[tip-bot for Taeung Song]

Commit-ID:  2733525b8c1a5f9b6e55338d836b835c9c698913
Gitweb:     http://git.kernel.org/tip/2733525b8c1a5f9b6e55338d836b835c9c698913
Author:     Taeung Song <treeze.taeung@xxxxxxxxx>
AuthorDate: Fri, 8 Jan 2016 20:39:33 +0900
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Tue, 26 Jan 2016 11:52:47 -0300

perf config: Document 'buildid.dir' variable in man page

Explain 'buildid.dir' variable.

Signed-off-by: Taeung Song <treeze.taeung@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1452253193-30502-4-git-send-email-treeze.taeung@xxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/Documentation/perf-config.txt | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt
index ccbdb64..a095f0c 100644
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -154,6 +154,21 @@ tui.*, gtk.*::
 	will make the TUI be the default for the 'top' subcommand. Those will be
 	available if the required libs were detected at tool build time.
 
+buildid.*::
+	buildid.dir::
+		Each executable and shared library in modern distributions comes with a
+		content based identifier that, if available, will be inserted in a
+		'perf.data' file header to, at analysis time find what is needed to do
+		symbol resolution, code annotation, etc.
+
+		The recording tools also stores a hard link or copy in a per-user
+		directory, $HOME/.debug/, of binaries, shared libraries, /proc/kallsyms
+		and /proc/kcore files to be used at analysis time.
+
+		The buildid.dir variable can be used to either change this directory
+		cache location, or to disable it altogether. If you want to disable it,
+		set buildid.dir to /dev/null. The default is $HOME/.debug
+
 SEE ALSO
 --------
 linkperf:perf[1]