perf evlist: Refactor evlist__scnprintf_evsels()

Switch output to using a strbuf so the storage can be resized.

Add a maximum size argument to avoid too much output that may happen for
uncore events.

Rename as scnprintf is no longer used.

Committer testing:

  With the patch applied:

  root@number:~# perf probe -x ~/bin/perf evlist__format_evsels
  Added new event:
    probe_perf:evlist_format_evsels (on evlist__format_evsels in /home/acme/bin/perf)

  You can now use it in all perf tools, such as:

  	perf record -e probe_perf:evlist_format_evsels -aR sleep 1

  root@number:~# perf probe -l
    probe_perf:evlist_format_evsels (on evlist__format_evsels@util/evlist.c in /home/acme/bin/perf)
  root@number:~# perf trace -e probe_perf:*/max-stack=10/ perf record -e cycles,instructions,cache-misses /tmp/bla
  Failed to collect 'cycles,instructions,cache-misses' for the '/tmp/bla' workload: Permission denied
       0.000 perf/3893011 probe_perf:evlist_format_evsels(__probe_ip: 6183397)
                                         evlist__format_evsels (/home/acme/bin/perf)
                                         __cmd_record (/home/acme/bin/perf)
                                         cmd_record (/home/acme/bin/perf)
                                         run_builtin (/home/acme/bin/perf)
                                         handle_internal_command (/home/acme/bin/perf)
                                         run_argv (/home/acme/bin/perf)
                                         main (/home/acme/bin/perf)
                                         __libc_start_call_main (/usr/lib64/libc.so.6)
                                         __libc_start_main@@GLIBC_2.34 (/usr/lib64/libc.so.6)
                                         _start (/home/acme/bin/perf)
  root@number:~#

Reviewed-by: Kan Liang <[email protected]>
Signed-off-by: Ian Rogers <[email protected]>
Tested-by: Arnaldo Carvalho de Melo <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Dominique Martinet <[email protected]>
Cc: Dr. David Alan Gilbert <[email protected]>
Cc: Howard Chu <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Levi Yun <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Weilin Wang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

0 files changed, 0 insertions, 0 deletions