logger: new relative timestamps option, relative to first entry seen

[marc-hb]

2 commits. The only big and main one:

Add a new sof-logger -e 0/1 relative timestamps option where the
TIMESTAMP column is relative to the first entry seen.

Removes many digits and makes the TIMESTAMP column much more readable in
short logs.

Also stop showing "NaN" as the first DELTA like something went
wrong. Show zero instead.

The new option is off by default when using -r(aw) and on otherwise.

The first entry is kept always absolute.

Before:

         TIMESTAMP              DELTA C# COMPONENT     LOCATION                      CONTENT
[6653843012.343750] (             NaN) c0 dma-trace    src/trace/dma-trace.c:339     ERROR FW ...
[6653843111.510417] (       99.166664) c0 ll-schedule  ./schedule/ll_schedule.c:229  perf ll_work
[6653843309.010417] (      197.500000) c0 ll-schedule  ./schedule/ll_schedule.c:399  task add
[6653843314.166667] (        5.156250) c0 ll-schedule  ./schedule/ll_schedule.c:403  task params
[6653843322.031250] (        7.864583) c0 ll-schedule  ./schedule/ll_schedule.c:309  new added
[6653843327.031250] (        5.000000) c0 ll-schedule  ./schedule/ll_schedule.c:312  num_tasks 2
[6653844109.531250] (      782.500000) c0 sa                    src/lib/agent.c:65   perf sys_load
[6653844155.156250] (       45.625000) c0 ll-schedule  ./schedule/ll_schedule.c:229  perf ll_work
[6653844384.218750] (      229.062500) c0 component       src/audio/component.c:130  comp new host

After:

         TIMESTAMP              DELTA C# COMPONENT     LOCATION                      CONTENT
[686125142.395834] (        0.000000) c0 dma-trace    src/trace/dma-trace.c:339     ERROR FW ...
[       94.270833] (       94.270836) c0 ll-schedule   ./schedule/ll_schedule.c:229  perf ll_work
[      296.770833] (      202.500000) c0 ll-schedule   ./schedule/ll_schedule.c:399  task add
[      301.979167] (        5.208333) c0 ll-schedule   ./schedule/ll_schedule.c:403  task params
[      309.843750] (        7.864583) c0 ll-schedule   ./schedule/ll_schedule.c:309  new added
[      314.843750] (        5.000000) c0 ll-schedule   ./schedule/ll_schedule.c:312  num_tasks 2
[     1092.395833] (      777.552063) c0 sa                     src/lib/agent.c:65   perf sys_load
[     1137.968750] (       45.572918) c0 ll-schedule   ./schedule/ll_schedule.c:229  perf ll_work
[     1850.208333] (      712.239563) c0 component        src/audio/component.c:130  comp new host

[dbaluta]

I think it is better to add strreror(errno). In my case most common problem is that I forget to add sof debugging support in linux so the debugfs file isn't even there.

[lgirdwood]

ack, IIUC the strerror() also has language translations.

[paulstelian97]

Please resubmit with "main" as PR base branch.

[marc-hb]

As the strerror() patch grew much bigger I split this into two different PRs re-submitted to the main branch:

logger: new relative timestamps option, relative to first entry seen #3985
logger: use strerror() #3984