perf trace: Beautify sched_[gs]et_attr return value
Both return errno, show the string associated then. More work needed to capture the sched_attr arg to beautify it in turn, probably using BPF. Before: 0.210 ( 0.001 ms): sched_setattr(uattr: 0x7ffc684f02b0) = -22 After the patch, for this sched_attr, all other parms are zero, so not shown: struct sched_attr attr = { .size = sizeof(attr), .sched_policy = SCHED_DEADLINE, .sched_runtime = 10 * USECS_PER_SEC, .sched_period = 30 * USECS_PER_SEC, .sched_deadline = attr.sched_period, }; 0.321 ( 0.002 ms): sched_setattr(uattr: 0x7ffc44116da0) = -1 EINVAL Invalid argument [root@jouet c]# perf trace -e sched_setattr ./sched_deadline Couldn't negotiate deadline: Invalid argument 0.229 ( 0.003 ms): sched_setattr(uattr: 0x7ffd8dcd8df0) = -1 EINVAL Invalid argument [root@jouet c]# Now to figure out the reason for this EINVAL. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Clark Williams <williams@redhat.com> Cc: Daniel Bristot de Oliveira <bristot@redhat.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-tyot2n7e48zm8pdw8tbcm3sl@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -742,6 +742,8 @@ static struct syscall_fmt {
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.arg_scnprintf = { [1] = SCA_SIGNUM, /* sig */ }, },
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{ .name = "rt_tgsigqueueinfo", .errmsg = true,
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.arg_scnprintf = { [2] = SCA_SIGNUM, /* sig */ }, },
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{ .name = "sched_getattr", .errmsg = true, },
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{ .name = "sched_setattr", .errmsg = true, },
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{ .name = "sched_setscheduler", .errmsg = true,
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.arg_scnprintf = { [1] = SCA_SCHED_POLICY, /* policy */ }, },
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{ .name = "seccomp", .errmsg = true,
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