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  4. 28 Sep, 2016 1 commit
    • Arnaldo Carvalho de Melo's avatar
      perf trace: Beautify sched_[gs]et_attr return value · f0bbd602
      Arnaldo Carvalho de Melo authored
      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.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      f0bbd602