From: Tomas Glozar <tglo...@redhat.com> Add option to limit deepest idle state on CPUs where timerlat is running for the duration of the workload.
Signed-off-by: Tomas Glozar <tglo...@redhat.com> --- tools/tracing/rtla/src/timerlat_top.c | 46 ++++++++++++++++++++++++++- 1 file changed, 45 insertions(+), 1 deletion(-) diff --git a/tools/tracing/rtla/src/timerlat_top.c b/tools/tracing/rtla/src/timerlat_top.c index 8c16419fe22a..ef1d3affef95 100644 --- a/tools/tracing/rtla/src/timerlat_top.c +++ b/tools/tracing/rtla/src/timerlat_top.c @@ -48,6 +48,7 @@ struct timerlat_top_params { int pretty_output; int warmup; int buffer_size; + int deepest_idle_state; cpu_set_t hk_cpu_set; struct sched_attr sched_param; struct trace_events *events; @@ -447,7 +448,7 @@ static void timerlat_top_usage(char *usage) "", " usage: rtla timerlat [top] [-h] [-q] [-a us] [-d s] [-D] [-n] [-p us] [-i us] [-T us] [-s us] \\", " [[-t[file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] [-c cpu-list] [-H cpu-list]\\", - " [-P priority] [--dma-latency us] [--aa-only us] [-C[=cgroup_name]] [-u|-k] [--warm-up s]", + " [-P priority] [--dma-latency us] [--aa-only us] [-C[=cgroup_name]] [-u|-k] [--warm-up s] [--deepest-idle-state n]", "", " -h/--help: print this menu", " -a/--auto: set automatic trace mode, stopping the session if argument in us latency is hit", @@ -481,6 +482,7 @@ static void timerlat_top_usage(char *usage) " -U/--user-load: enable timerlat for user-defined user-space workload", " --warm-up s: let the workload run for s seconds before collecting data", " --trace-buffer-size kB: set the per-cpu trace buffer size in kB", + " --deepest-idle-state n: only go down to idle state n on cpus used by timerlat to reduce exit from idle latency", NULL, }; @@ -518,6 +520,9 @@ static struct timerlat_top_params /* disabled by default */ params->dma_latency = -1; + /* disabled by default */ + params->deepest_idle_state = -2; + /* display data in microseconds */ params->output_divisor = 1000; @@ -550,6 +555,7 @@ static struct timerlat_top_params {"aa-only", required_argument, 0, '5'}, {"warm-up", required_argument, 0, '6'}, {"trace-buffer-size", required_argument, 0, '7'}, + {"deepest-idle-state", required_argument, 0, '8'}, {0, 0, 0, 0} }; @@ -726,6 +732,9 @@ static struct timerlat_top_params case '7': params->buffer_size = get_llong_from_str(optarg); break; + case '8': + params->deepest_idle_state = get_llong_from_str(optarg); + break; default: timerlat_top_usage("Invalid option"); } @@ -922,6 +931,9 @@ int timerlat_top_main(int argc, char *argv[]) int return_value = 1; char *max_lat; int retval; +#ifdef HAVE_LIBCPUPOWER_SUPPORT + int i; +#endif /* HAVE_LIBCPUPOWER_SUPPORT */ params = timerlat_top_parse_args(argc, argv); if (!params) @@ -971,6 +983,26 @@ int timerlat_top_main(int argc, char *argv[]) } } + if (params->deepest_idle_state >= -1) { +#ifdef HAVE_LIBCPUPOWER_SUPPORT + for (i = 0; i < sysconf(_SC_NPROCESSORS_CONF); i++) { + if (params->cpus && !CPU_ISSET(i, ¶ms->monitored_cpus)) + continue; + if (save_cpu_idle_disable_state(i) < 0) { + err_msg("Could not save cpu idle state.\n"); + goto out_free; + } + if (set_deepest_cpu_idle_state(i, params->deepest_idle_state) < 0) { + err_msg("Could not set deepest cpu idle state.\n"); + goto out_free; + } + } +#else + err_msg("rtla built without libcpupower, --deepest-idle-state is not supported\n"); + goto out_free; +#endif /* HAVE_LIBCPUPOWER_SUPPORT */ + } + if (params->trace_output) { record = osnoise_init_trace_tool("timerlat"); if (!record) { @@ -1125,6 +1157,15 @@ int timerlat_top_main(int argc, char *argv[]) timerlat_aa_destroy(); if (dma_latency_fd >= 0) close(dma_latency_fd); +#ifdef HAVE_LIBCPUPOWER_SUPPORT + if (params->deepest_idle_state >= -1) { + for (i = 0; i < sysconf(_SC_NPROCESSORS_CONF); i++) { + if (params->cpus && !CPU_ISSET(i, ¶ms->monitored_cpus)) + continue; + restore_cpu_idle_disable_state(i); + } + } +#endif /* HAVE_LIBCPUPOWER_SUPPORT */ trace_events_destroy(&record->trace, params->events); params->events = NULL; out_free: @@ -1134,6 +1175,9 @@ int timerlat_top_main(int argc, char *argv[]) osnoise_destroy_tool(record); osnoise_destroy_tool(top); free(params); +#ifdef HAVE_LIBCPUPOWER_SUPPORT + free_cpu_idle_disable_states(); +#endif /* HAVE_LIBCPUPOWER_SUPPORT */ out_exit: exit(return_value); } -- 2.45.2