Explain 'record.build-id' variable.

Cc: Namhyung Kim <[email protected]>
Cc: Jiri Olsa <[email protected]>
Signed-off-by: Taeung Song <[email protected]>
---
 tools/perf/Documentation/perf-config.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/perf/Documentation/perf-config.txt 
b/tools/perf/Documentation/perf-config.txt
index 1d24d94..88bc921 100644
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -429,6 +429,14 @@ kmem.*::
                This option decides which allocator is to be analyzed if neither
                '--slab' nor '--page' option is used. Default is 'slab'.
 
+record.*::
+       record.build-id::
+               This option can be 'cache', 'no-cache' or 'skip'.
+               'cache' is to post-process data and save/update the binaries 
into
+               the build-id cache (in ~/.debug). This is the default.
+               But if this option is 'no-cache', not update the build-id cache.
+               'skip' mean that skip post-processing and do not update the 
cache.
+
 SEE ALSO
 --------
 linkperf:perf[1]
-- 
2.5.0

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