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-rw-r--r--tools/perf/Documentation/itrace.txt12
1 files changed, 12 insertions, 0 deletions
diff --git a/tools/perf/Documentation/itrace.txt b/tools/perf/Documentation/itrace.txt
index 82ff7dad40c2..5961e8a3ef3a 100644
--- a/tools/perf/Documentation/itrace.txt
+++ b/tools/perf/Documentation/itrace.txt
@@ -10,6 +10,7 @@
e synthesize error events
d create a debug log
g synthesize a call chain (use with i or x)
+ G synthesize a call chain on existing event records
l synthesize last branch entries (use with i or x)
s skip initial number of events
@@ -37,3 +38,14 @@
--itrace=i0nss1000000
skips the first million instructions.
+
+ The 'e' option may be followed by flags which affect what errors will or
+ will not be reported. Each flag must be preceded by either '+' or '-'.
+ The flags are:
+ o overflow
+ l trace data lost
+
+ If supported, the 'd' option may be followed by flags which affect what
+ debug messages will or will not be logged. Each flag must be preceded
+ by either '+' or '-'. The flags are:
+ a all perf events