perf python tracepoint: Switch to using parse_events

Rather than manually configuring an evsel, switch to using
parse_events for greater commonality with the rest of the perf code.

Reviewed-by: Howard Chu <howardchu95@gmail.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: https://lore.kernel.org/r/20250228222308.626803-12-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

tools/perf/python/tracepoint.py

@@ -5,24 +5,23 @@
 
 import perf
 
-class tracepoint(perf.evsel):
-    def __init__(self, sys, name):
-        config = perf.tracepoint(sys, name)
-        perf.evsel.__init__(self,
-                            type   = perf.TYPE_TRACEPOINT,
-                            config = config,
-                            freq = 0, sample_period = 1, wakeup_events = 1,
-                            sample_type = perf.SAMPLE_PERIOD | perf.SAMPLE_TID | perf.SAMPLE_CPU | perf.SAMPLE_RAW | perf.SAMPLE_TIME)
-
 def main():
-    tp      = tracepoint("sched", "sched_switch")
     cpus    = perf.cpu_map()
     threads = perf.thread_map(-1)
+    evlist = perf.parse_events("sched:sched_switch", cpus, threads)
+    # Disable tracking of mmaps and similar that are unnecessary.
+    for ev in evlist:
+        ev.tracking = False
+    # Configure evsels with default record options.
+    evlist.config()
+    # Simplify the sample_type and read_format of evsels
+    for ev in evlist:
+        ev.sample_type = ev.sample_type & ~perf.SAMPLE_IP
+        ev.read_format = 0
 
-    evlist = perf.evlist(cpus, threads)
-    evlist.add(tp)
     evlist.open()
     evlist.mmap()
+    evlist.enable();
 
     while True:
         evlist.poll(timeout = -1)