[PATCH 2/4] perf parse-events: Don't move topdown metrics events when sorting events

Dapeng Mi
2024-07-02T06:39:47Z

when running below perf command, we say error is reported.

perf record -e "{slots,instructions,topdown-retiring}:S" -vv -C0 sleep 1

------------------------------------------------------------
perf_event_attr:
type 4 (cpu)
size 168
config 0x400 (slots)
sample_type IP|TID|TIME|READ|CPU|PERIOD|IDENTIFIER
read_format ID|GROUP|LOST
disabled 1
sample_id_all 1
exclude_guest 1
------------------------------------------------------------
sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 = 5
------------------------------------------------------------
perf_event_attr:
type 4 (cpu)
size 168
config 0x8000 (topdown-retiring)
{ sample_period, sample_freq } 4000
sample_type IP|TID|TIME|READ|CPU|PERIOD|IDENTIFIER
read_format ID|GROUP|LOST
freq 1
sample_id_all 1
exclude_guest 1
------------------------------------------------------------
sys_perf_event_open: pid -1 cpu 0 group_fd 5 flags 0x8
sys_perf_event_open failed, error -22

Error:
The sys_perf_event_open() syscall returned with 22 (Invalid argument) for event (topdown-retiring).

The reason of error is that the events are regrouped and
topdown-retiring event is moved to closely after the slots event and
topdown-retiring event needs to do the sampling, but Intel PMU driver
doesn't support to sample topdown metrics events.

For topdown metrics events, it just requires to be in a group which has
slots event as leader. It doesn't require topdown metrics event must be
closely after slots event. Thus it's a overkill to move topdown metrics
event closely after slots event in events regrouping and furtherly cause
the above issue.

Thus delete the code that moving topdown metrics events to fix the
issue.

Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
---
tools/perf/arch/x86/util/evlist.c | 5 -----
1 file changed, 5 deletions(-)

diff --git a/tools/perf/arch/x86/util/evlist.c b/tools/perf/arch/x86/util/evlist.c
index b1ce0c52d88d..7215c7c7b435 100644
--- a/tools/perf/arch/x86/util/evlist.c
+++ b/tools/perf/arch/x86/util/evlist.c
@@ -82,11 +82,6 @@ int arch_evlist__cmp(const struct evsel *lhs, const struct evsel *rhs)
return -1;
if (strcasestr(rhs->name, "slots") && !strcasestr(rhs->name, "uops_retired.slots"))
return 1;
- /* Followed by topdown events. */
- if (strcasestr(lhs->name, "topdown") && !strcasestr(rhs->name, "topdown"))
- return -1;
- if (!strcasestr(lhs->name, "topdown") && strcasestr(rhs->name, "topdown"))
- return 1;
}

/* Default ordering by insertion index. */
--
2.40.1