mirror/libbpf
1
0
Fork 0
mirror of https://github.com/netdata/libbpf.git synced 2026-04-01 14:19:07 +08:00
Code Issues Packages Projects Releases Wiki Activity

libbpf: Add ring__consume_n / ring_buffer__consume_n

Browse Source 
Introduce a new API to consume items from a ring buffer, limited to a
specified amount, and return to the caller the actual number of items
consumed.

Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/lkml/20240310154726.734289-1-andrea.righi@canonical.com/T
Link: https://lore.kernel.org/bpf/20240406092005.92399-4-andrea.righi@canonical.com
This commit is contained in:
Andrea Righi
2024-04-06 11:15:43 +02:00
committed by Andrii Nakryiko
parent 98de9ace4d
commit b521a722b9
3 changed files with 50 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
src/ringbuf.c
View File

@@ -277,6 +277,33 @@ done:
return cnt;
}
/* Consume available ring buffer(s) data without event polling, up to n
* records.
*
* Returns number of records consumed across all registered ring buffers (or
* n, whichever is less), or negative number if any of the callbacks return
* error.
*/
int ring_buffer__consume_n(struct ring_buffer *rb, size_t n)
{
int64_t err, res = 0;
int i;
for (i = 0; i < rb->ring_cnt; i++) {
struct ring *ring = rb->rings[i];
err = ringbuf_process_ring(ring, n);
if (err < 0)
return libbpf_err(err);
res += err;
n -= err;
if (n == 0)
break;
}
return res;
}
/* Consume available ring buffer(s) data without event polling.
* Returns number of records consumed across all registered ring buffers (or
* INT_MAX, whichever is less), or negative number if any of the callbacks
@@ -376,17 +403,22 @@ int ring__map_fd(const struct ring *r)
return r->map_fd;
}
int ring__consume(struct ring *r)
int ring__consume_n(struct ring *r, size_t n)
{
int64_t res;
int res;
res = ringbuf_process_ring(r, INT_MAX);
res = ringbuf_process_ring(r, n);
if (res < 0)
return libbpf_err(res);
return res > INT_MAX ? INT_MAX : res;
}
int ring__consume(struct ring *r)
{
return ring__consume_n(r, INT_MAX);
}
static void user_ringbuf_unmap_ring(struct user_ring_buffer *rb)
{
if (rb->consumer_pos) {