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libbpf: Add sample_period to creation options 

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 9b0651e429
commit ab8684b8ce
2 changed files with 10 additions and 3 deletions
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9
tools/lib/bpf/libbpf.c
View File

@ -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;

4
tools/lib/bpf/libbpf.h
View File

@ -1247,8 +1247,10 @@ typedef void (*perf_buffer_lost_fn)(void *ctx, int cpu, __u64 cnt);
/* common use perf buffer options */
struct perf_buffer_opts {
size_t sz;
__u32 sample_period;
size_t :0;
};
#define perf_buffer_opts__last_field sz
#define perf_buffer_opts__last_field sample_period
/**
* @brief **perf_buffer__new()** creates BPF perfbuf manager for a specified