perf/Documentation/cpu-and-latency-overheads.txt

1 CPU and latency overheads
9 'latency' columns for CPU and wall-clock time correspondingly).
12 latency overhead is useful to improve 'latency'. It's important to understand
16 latency of a single interactive program build.
21 While the latency overhead is: 'foo' - 90%, 'bar' - 10%. If we try to optimize
26 By default, perf shows only CPU overhead. To show latency overhead, use
27 'perf record --latency' and 'perf report':
30 Overhead  Latency  Command
38 To sort by latency overhead, use 'perf report --latency':
41 Latency  Overhead  Command
50 parallelization histogram with '--sort=latency,parallelism,comm,symbol --hierarchy'
58   Latency  Overhead     Parallelism / Command / Symbol
72   Latency  Overhead     Parallelism / Command / Symbol
85 of a workload use '--latency --parallelism=1-2' flags.