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perf evsel: Adjust hybrid event and global event mixed group
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A group mixed with hybrid event and global event is allowed. For
example, group leader is 'intel_pt//' and the group member is
'cpu_atom/cycles/'.

e.g.:

  # perf record --aux-sample -e '{intel_pt//,cpu_atom/cycles/}:u'

The challenge is that their available cpus are not fully matched. For
example, 'intel_pt//' is available on CPU0-CPU23, but 'cpu_atom/cycles/'
is available on CPU16-CPU23.

When getting the group id for group member, we must be very careful.
Because the cpu for 'intel_pt//' is not equal to the cpu for
'cpu_atom/cycles/'. Actually the cpu here is the index of evsel->core.cpus,
not the real CPU ID.

e.g. cpu0 for 'intel_pt//' is CPU0, but cpu0 for 'cpu_atom/cycles/' is CPU16.

Before:

  # perf record --aux-sample -e '{intel_pt//,cpu_atom/cycles/}:u' -vv uname
  ...
  ------------------------------------------------------------
  perf_event_attr:
    type                             10
    size                             128
    config                           0xe601
    { sample_period, sample_freq }   1
    sample_type                      IP|TID|TIME|CPU|IDENTIFIER
    read_format                      ID
    disabled                         1
    inherit                          1
    exclude_kernel                   1
    exclude_hv                       1
    enable_on_exec                   1
    sample_id_all                    1
    exclude_guest                    1
  ------------------------------------------------------------
  sys_perf_event_open: pid 4084  cpu 0  group_fd -1  flags 0x8 = 5
  sys_perf_event_open: pid 4084  cpu 1  group_fd -1  flags 0x8 = 6
  sys_perf_event_open: pid 4084  cpu 2  group_fd -1  flags 0x8 = 7
  sys_perf_event_open: pid 4084  cpu 3  group_fd -1  flags 0x8 = 9
  sys_perf_event_open: pid 4084  cpu 4  group_fd -1  flags 0x8 = 10
  sys_perf_event_open: pid 4084  cpu 5  group_fd -1  flags 0x8 = 11
  sys_perf_event_open: pid 4084  cpu 6  group_fd -1  flags 0x8 = 12
  sys_perf_event_open: pid 4084  cpu 7  group_fd -1  flags 0x8 = 13
  sys_perf_event_open: pid 4084  cpu 8  group_fd -1  flags 0x8 = 14
  sys_perf_event_open: pid 4084  cpu 9  group_fd -1  flags 0x8 = 15
  sys_perf_event_open: pid 4084  cpu 10  group_fd -1  flags 0x8 = 16
  sys_perf_event_open: pid 4084  cpu 11  group_fd -1  flags 0x8 = 17
  sys_perf_event_open: pid 4084  cpu 12  group_fd -1  flags 0x8 = 18
  sys_perf_event_open: pid 4084  cpu 13  group_fd -1  flags 0x8 = 19
  sys_perf_event_open: pid 4084  cpu 14  group_fd -1  flags 0x8 = 20
  sys_perf_event_open: pid 4084  cpu 15  group_fd -1  flags 0x8 = 21
  sys_perf_event_open: pid 4084  cpu 16  group_fd -1  flags 0x8 = 22
  sys_perf_event_open: pid 4084  cpu 17  group_fd -1  flags 0x8 = 23
  sys_perf_event_open: pid 4084  cpu 18  group_fd -1  flags 0x8 = 24
  sys_perf_event_open: pid 4084  cpu 19  group_fd -1  flags 0x8 = 25
  sys_perf_event_open: pid 4084  cpu 20  group_fd -1  flags 0x8 = 26
  sys_perf_event_open: pid 4084  cpu 21  group_fd -1  flags 0x8 = 27
  sys_perf_event_open: pid 4084  cpu 22  group_fd -1  flags 0x8 = 28
  sys_perf_event_open: pid 4084  cpu 23  group_fd -1  flags 0x8 = 29
  ------------------------------------------------------------
  perf_event_attr:
    size                             128
    config                           0x800000000
    { sample_period, sample_freq }   4000
    sample_type                      IP|TID|TIME|PERIOD|IDENTIFIER|AUX
    read_format                      ID
    inherit                          1
    exclude_kernel                   1
    exclude_hv                       1
    freq                             1
    sample_id_all                    1
    exclude_guest                    1
    aux_sample_size                  4096
  ------------------------------------------------------------
  sys_perf_event_open: pid 4084  cpu 16  group_fd 5  flags 0x8
  sys_perf_event_open failed, error -22

The group_fd 5 is not correct. It should be 22 (the fd of
'intel_pt' on CPU16).

After:

  # perf record --aux-sample -e '{intel_pt//,cpu_atom/cycles/}:u' -vv uname
  ...
  ------------------------------------------------------------
  perf_event_attr:
    type                             10
    size                             128
    config                           0xe601
    { sample_period, sample_freq }   1
    sample_type                      IP|TID|TIME|CPU|IDENTIFIER
    read_format                      ID
    disabled                         1
    inherit                          1
    exclude_kernel                   1
    exclude_hv                       1
    enable_on_exec                   1
    sample_id_all                    1
    exclude_guest                    1
  ------------------------------------------------------------
  sys_perf_event_open: pid 5162  cpu 0  group_fd -1  flags 0x8 = 5
  sys_perf_event_open: pid 5162  cpu 1  group_fd -1  flags 0x8 = 6
  sys_perf_event_open: pid 5162  cpu 2  group_fd -1  flags 0x8 = 7
  sys_perf_event_open: pid 5162  cpu 3  group_fd -1  flags 0x8 = 9
  sys_perf_event_open: pid 5162  cpu 4  group_fd -1  flags 0x8 = 10
  sys_perf_event_open: pid 5162  cpu 5  group_fd -1  flags 0x8 = 11
  sys_perf_event_open: pid 5162  cpu 6  group_fd -1  flags 0x8 = 12
  sys_perf_event_open: pid 5162  cpu 7  group_fd -1  flags 0x8 = 13
  sys_perf_event_open: pid 5162  cpu 8  group_fd -1  flags 0x8 = 14
  sys_perf_event_open: pid 5162  cpu 9  group_fd -1  flags 0x8 = 15
  sys_perf_event_open: pid 5162  cpu 10  group_fd -1  flags 0x8 = 16
  sys_perf_event_open: pid 5162  cpu 11  group_fd -1  flags 0x8 = 17
  sys_perf_event_open: pid 5162  cpu 12  group_fd -1  flags 0x8 = 18
  sys_perf_event_open: pid 5162  cpu 13  group_fd -1  flags 0x8 = 19
  sys_perf_event_open: pid 5162  cpu 14  group_fd -1  flags 0x8 = 20
  sys_perf_event_open: pid 5162  cpu 15  group_fd -1  flags 0x8 = 21
  sys_perf_event_open: pid 5162  cpu 16  group_fd -1  flags 0x8 = 22
  sys_perf_event_open: pid 5162  cpu 17  group_fd -1  flags 0x8 = 23
  sys_perf_event_open: pid 5162  cpu 18  group_fd -1  flags 0x8 = 24
  sys_perf_event_open: pid 5162  cpu 19  group_fd -1  flags 0x8 = 25
  sys_perf_event_open: pid 5162  cpu 20  group_fd -1  flags 0x8 = 26
  sys_perf_event_open: pid 5162  cpu 21  group_fd -1  flags 0x8 = 27
  sys_perf_event_open: pid 5162  cpu 22  group_fd -1  flags 0x8 = 28
  sys_perf_event_open: pid 5162  cpu 23  group_fd -1  flags 0x8 = 29
  ------------------------------------------------------------
  perf_event_attr:
    size                             128
    config                           0x800000000
    { sample_period, sample_freq }   4000
    sample_type                      IP|TID|TIME|PERIOD|IDENTIFIER|AUX
    read_format                      ID
    inherit                          1
    exclude_kernel                   1
    exclude_hv                       1
    freq                             1
    sample_id_all                    1
    exclude_guest                    1
    aux_sample_size                  4096
  ------------------------------------------------------------
  sys_perf_event_open: pid 5162  cpu 16  group_fd 22  flags 0x8 = 30
  sys_perf_event_open: pid 5162  cpu 17  group_fd 23  flags 0x8 = 31
  sys_perf_event_open: pid 5162  cpu 18  group_fd 24  flags 0x8 = 32
  sys_perf_event_open: pid 5162  cpu 19  group_fd 25  flags 0x8 = 33
  sys_perf_event_open: pid 5162  cpu 20  group_fd 26  flags 0x8 = 34
  sys_perf_event_open: pid 5162  cpu 21  group_fd 27  flags 0x8 = 35
  sys_perf_event_open: pid 5162  cpu 22  group_fd 28  flags 0x8 = 36
  sys_perf_event_open: pid 5162  cpu 23  group_fd 29  flags 0x8 = 37
  ------------------------------------------------------------
  ...

Signed-off-by: Jin Yao <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Jin Yao <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
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@acmel
Jin Yao authored and acmel committed Jun 10, 2021
1 parent 0808b3d commit 1fcc57b
Showing 1 changed file with 25 additions and 0 deletions.
25 changes: 25 additions & 0 deletions tools/perf/util/evsel.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1581,6 +1581,27 @@ int __evsel__read_on_cpu(struct evsel *evsel, int cpu, int thread, bool scale)
return 0;
}

static int evsel__match_other_cpu(struct evsel *evsel, struct evsel *other,
int cpu)
{
int cpuid;

cpuid = perf_cpu_map__cpu(evsel->core.cpus, cpu);
return perf_cpu_map__idx(other->core.cpus, cpuid);
}

static int evsel__hybrid_group_cpu(struct evsel *evsel, int cpu)
{
struct evsel *leader = evsel->leader;

if ((evsel__is_hybrid(evsel) && !evsel__is_hybrid(leader)) ||
(!evsel__is_hybrid(evsel) && evsel__is_hybrid(leader))) {
return evsel__match_other_cpu(evsel, leader, cpu);
}

return cpu;
}

static int get_group_fd(struct evsel *evsel, int cpu, int thread)
{
struct evsel *leader = evsel->leader;
Expand All @@ -1595,6 +1616,10 @@ static int get_group_fd(struct evsel *evsel, int cpu, int thread)
*/
BUG_ON(!leader->core.fd);

cpu = evsel__hybrid_group_cpu(evsel, cpu);
if (cpu == -1)
return -1;

fd = FD(leader, cpu, thread);
BUG_ON(fd == -1);

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