libbpf: Remove sample_period init in perf_buffer

It seems that sample_period is not used in perf buffer. Actually, only
wakeup_events are meaningful to enable events aggregation for wakeup notification.
Remove sample_period setting code to avoid confusion.

Fixes: fb84b82 ("libbpf: add perf buffer API")
Signed-off-by: Tao Chen <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

Author: Tao Chen

tools/lib/bpf/libbpf.c

@@ -13375,7 +13375,6 @@ struct perf_buffer *perf_buffer__new(int map_fd, size_t page_cnt,
 	attr.config = PERF_COUNT_SW_BPF_OUTPUT;
 	attr.type = PERF_TYPE_SOFTWARE;
 	attr.sample_type = PERF_SAMPLE_RAW;
-	attr.sample_period = sample_period;
 	attr.wakeup_events = sample_period;
 
 	p.attr = &attr;