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9 Tracepoints (see Documentation/trace/tracepoints.txt) can be used without
13 Simplistically, tracepoints represent important events that can be
17 this document describes some of the methods that can be used.
59 can be enabled system-wide. A short example of enabling all events related
93 for a duration of time can be examined.
119 Events can be activated and tracked for the duration of a process on a local
144 Any workload can exhibit variances between runs and it can be important
147 occurrences are useful to the performance analyst, then perf can be used.
186 When events are enabled the events that are triggering can be read from
188 options exist as well. By post-processing the output, further information can
196 script that can read trace_pipe from STDIN or a copy of a trace. When used
197 on-line, it can be interrupted once to generate a report without exiting
201 also can do more such as
207   o It can aggregate based on PID or individual process number
210   o When receiving an event about a PID, it can record who the parent was so
213     can be identified
230 period is quite high to minimise overhead but the information collected can be
233 This record outputted a file called perf.data which can be analysed using