diff options
Diffstat (limited to 'tools/tracing/rtla/src/timerlat_top.c')
-rw-r--r-- | tools/tracing/rtla/src/timerlat_top.c | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/tools/tracing/rtla/src/timerlat_top.c b/tools/tracing/rtla/src/timerlat_top.c index bf2a50350e61..53f4cdfd395e 100644 --- a/tools/tracing/rtla/src/timerlat_top.c +++ b/tools/tracing/rtla/src/timerlat_top.c @@ -29,6 +29,7 @@ struct timerlat_top_params { int duration; int quiet; int set_sched; + int dma_latency; struct sched_attr sched_param; struct trace_events *events; }; @@ -269,7 +270,7 @@ 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] \\", - " [-P priority]", + " [-P priority] [--dma-latency us]", "", " -h/--help: print this menu", " -a/--auto: set automatic trace mode, stopping the session if argument in us latency is hit", @@ -286,6 +287,7 @@ static void timerlat_top_usage(char *usage) " --trigger <command>: enable a trace event trigger to the previous -e event", " -n/--nano: display data in nanoseconds", " -q/--quiet print only a summary at the end", + " --dma-latency us: set /dev/cpu_dma_latency latency <us> to reduce exit from idle latency", " -P/--priority o:prio|r:prio|f:prio|d:runtime:period : set scheduling parameters", " o:prio - use SCHED_OTHER with prio", " r:prio - use SCHED_RR with prio", @@ -322,6 +324,9 @@ static struct timerlat_top_params if (!params) exit(1); + /* disabled by default */ + params->dma_latency = -1; + /* display data in microseconds */ params->output_divisor = 1000; @@ -343,13 +348,14 @@ static struct timerlat_top_params {"trace", optional_argument, 0, 't'}, {"trigger", required_argument, 0, '0'}, {"filter", required_argument, 0, '1'}, + {"dma-latency", required_argument, 0, '2'}, {0, 0, 0, 0} }; /* getopt_long stores the option index here. */ int option_index = 0; - c = getopt_long(argc, argv, "a:c:d:De:hi:np:P:qs:t::T:0:1:", + c = getopt_long(argc, argv, "a:c:d:De:hi:np:P:qs:t::T:0:1:2:", long_options, &option_index); /* detect the end of the options. */ @@ -454,6 +460,13 @@ static struct timerlat_top_params timerlat_top_usage("--filter requires a previous -e\n"); } break; + case '2': /* dma-latency */ + params->dma_latency = get_llong_from_str(optarg); + if (params->dma_latency < 0 || params->dma_latency > 10000) { + err_msg("--dma-latency needs to be >= 0 and < 10000"); + exit(EXIT_FAILURE); + } + break; default: timerlat_top_usage("Invalid option"); } @@ -582,6 +595,7 @@ int timerlat_top_main(int argc, char *argv[]) struct osnoise_tool *record = NULL; struct osnoise_tool *top = NULL; struct trace_instance *trace; + int dma_latency_fd = -1; int return_value = 1; int retval; @@ -617,6 +631,14 @@ int timerlat_top_main(int argc, char *argv[]) } } + if (params->dma_latency >= 0) { + dma_latency_fd = set_cpu_dma_latency(params->dma_latency); + if (dma_latency_fd < 0) { + err_msg("Could not set /dev/cpu_dma_latency.\n"); + goto out_top; + } + } + trace_instance_start(trace); if (params->trace_output) { @@ -673,6 +695,8 @@ int timerlat_top_main(int argc, char *argv[]) } out_top: + if (dma_latency_fd >= 0) + close(dma_latency_fd); trace_events_destroy(&record->trace, params->events); params->events = NULL; timerlat_free_top(top->data); |