Explain 'kmem.default' variable.

Cc: Namhyung Kim <[email protected]>
Cc: Jiri Olsa <[email protected]>
Signed-off-by: Taeung Song <[email protected]>
---
 tools/perf/Documentation/perf-config.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/perf/Documentation/perf-config.txt 
b/tools/perf/Documentation/perf-config.txt
index be6bb28..8730feb 100644
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -427,6 +427,11 @@ pager.*::
                When the subcommand is run on stdio, determine whether it uses
                pager or not based on this value. Default is 'unspecified'.
 
+kmem.*::
+       kmem.default::
+               This option decides which allocator is to be analyzed if neither
+               '--slab' nor '--page' option is used. Default is 'slab'.
+
 SEE ALSO
 --------
 linkperf:perf[1]
-- 
1.9.1

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