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examples/link-cp: improve memory use

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Put the data at the end so we don't have to offset the actual buffer.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2019-05-15 14:11:10 -06:00
parent 5c6e5d2745
commit 9511863658
1 changed files with 9 additions and 4 deletions
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13
examples/link-cp.c
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@@ -66,11 +66,13 @@ static void queue_rw_pair(struct io_uring *ring, off_t size, off_t offset)
{ {
struct io_uring_sqe *sqe; struct io_uring_sqe *sqe;
struct io_data *data; struct io_data *data;
void *ptr;
data = malloc(size + sizeof(*data)); ptr = malloc(size + sizeof(*data));
data = ptr + size;
data->index = 0; data->index = 0;
data->offset = offset; data->offset = offset;
data->iov.iov_base = data + 1; data->iov.iov_base = ptr;
data->iov.iov_len = size; data->iov.iov_len = size;
sqe = io_uring_get_sqe(ring); sqe = io_uring_get_sqe(ring);
@@ -100,8 +102,11 @@ static int handle_cqe(struct io_uring *ring, struct io_uring_cqe *cqe)
} }
} }
if (data->index == 2) if (data->index == 2) {
free(data); void *ptr = (void *) data - data->iov.iov_len;
free(ptr);
}
io_uring_cqe_seen(ring, cqe); io_uring_cqe_seen(ring, cqe);
return ret; return ret;
} }