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libbpf: Add sample_period to creation options

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Add option to set when the perf buffer should wake up, by default the
perf buffer becomes signaled for every event that is being pushed to it.

In case of a high throughput of events it will be more efficient to wake
up only once you have X events ready to be read.

So your application can wakeup once and drain the entire perf buffer.

Signed-off-by: Jon Doron <jond@wiz.io>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20230207081916.3398417-1-arilou@gmail.com
This commit is contained in:
Jon Doron
2023-02-07 10:19:16 +02:00
committed by Andrii Nakryiko
parent 6333ea6a3a
commit 8c8243a409
2 changed files with 10 additions and 3 deletions
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9
src/libbpf.c
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@@ -11673,17 +11673,22 @@ struct perf_buffer *perf_buffer__new(int map_fd, size_t page_cnt,
const size_t attr_sz = sizeof(struct perf_event_attr);
struct perf_buffer_params p = {};
struct perf_event_attr attr;
__u32 sample_period;
if (!OPTS_VALID(opts, perf_buffer_opts))
return libbpf_err_ptr(-EINVAL);
sample_period = OPTS_GET(opts, sample_period, 1);
if (!sample_period)
sample_period = 1;
memset(&attr, 0, attr_sz);
attr.size = attr_sz;
attr.config = PERF_COUNT_SW_BPF_OUTPUT;
attr.type = PERF_TYPE_SOFTWARE;
attr.sample_type = PERF_SAMPLE_RAW;
attr.sample_period = 1;
attr.wakeup_events = 1;
attr.sample_period = sample_period;
attr.wakeup_events = sample_period;
p.attr = &attr;
p.sample_cb = sample_cb;