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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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4
src/libbpf.h
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@@ -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