[DOC] Clarify PAPI counters + privileges

diff --git a/doc/doxygen/options.doc b/doc/doxygen/options.doc
index 9f33858..cdb3654 100644 (file)
--- a/doc/doxygen/options.doc
+++ b/doc/doxygen/options.doc
@@ -851,6 +851,8 @@ This is the default value:
     This feature currently requires superuser privileges, as registers are queried.
     Only use this feature with code you trust! Call smpirun for instance via
         smpirun -wrapper "sudo " <your-parameters>
     This feature currently requires superuser privileges, as registers are queried.
     Only use this feature with code you trust! Call smpirun for instance via
         smpirun -wrapper "sudo " <your-parameters>

+    or run sudo sh -c "echo 0 > /proc/sys/kernel/perf_event_paranoid"
+    In the later case, sudo will not be required.

 
 \note
     This option is only available when SimGrid was compiled with PAPI support.
 
 \note
     This option is only available when SimGrid was compiled with PAPI support.