On 12/8/16 7:47 AM, Namhyung Kim wrote: > Hi, > > This patchset implements the idle hist feature which analyze reason of system > idle. Sometimes I need to investigate what makes CPUs to go idle even though > I have jobs to do. It may be due to I/O, waiting on lock or whatever. >
... > Namhyung Kim (6): > perf sched timehist: Split is_idle_sample() > perf sched timehist: Introduce struct idle_time_data > perf sched timehist: Save callchain when entering idle > perf sched timehist: Skip non-idle events when necessary > perf sched timehist: Add -I/--idle-hist option > perf sched timehist: Show callchains for idle stat > > tools/perf/Documentation/perf-sched.txt | 4 + > tools/perf/builtin-sched.c | 252 > +++++++++++++++++++++++++++----- > 2 files changed, 222 insertions(+), 34 deletions(-) > LGTM Acked-by: David Ahern <dsah...@gmail.com> Suggested improvement: Add the length of the time window. ie., data collected (or analyzed over if --time is used) for N.M seconds. Puts the amount of idle time into perspective.
