From: Hristo Venev <hristo@venev.name>
To: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org, Hristo Venev <hristo@venev.name>
Subject: [PATCH 2/2] liburing: Use the single mmap feature
Date: Fri, 6 Sep 2019 20:12:52 +0100 [thread overview]
Message-ID: <20190906191252.30332-2-hristo@venev.name> (raw)
In-Reply-To: <20190906191252.30332-1-hristo@venev.name>
Signed-off-by: Hristo Venev <hristo@venev.name>
---
src/setup.c | 35 ++++++++++++++++++++++++++---------
1 file changed, 26 insertions(+), 9 deletions(-)
diff --git a/src/setup.c b/src/setup.c
index 47b0deb..48c96a0 100644
--- a/src/setup.c
+++ b/src/setup.c
@@ -16,10 +16,30 @@ static int io_uring_mmap(int fd, struct io_uring_params *p,
int ret;
sq->ring_sz = p->sq_off.array + p->sq_entries * sizeof(unsigned);
+ cq->ring_sz = p->cq_off.cqes + p->cq_entries * sizeof(struct io_uring_cqe);
+
+ if (p->features & IORING_FEAT_SINGLE_MMAP) {
+ if (cq->ring_sz > sq->ring_sz) {
+ sq->ring_sz = cq->ring_sz;
+ }
+ cq->ring_sz = sq->ring_sz;
+ }
sq->ring_ptr = mmap(0, sq->ring_sz, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_POPULATE, fd, IORING_OFF_SQ_RING);
if (sq->ring_ptr == MAP_FAILED)
return -errno;
+
+ if (p->features & IORING_FEAT_SINGLE_MMAP) {
+ cq->ring_ptr = sq->ring_ptr;
+ } else {
+ cq->ring_ptr = mmap(0, cq->ring_sz, PROT_READ | PROT_WRITE,
+ MAP_SHARED | MAP_POPULATE, fd, IORING_OFF_CQ_RING);
+ if (cq->ring_ptr == MAP_FAILED) {
+ ret = -errno;
+ goto err;
+ }
+ }
+
sq->khead = sq->ring_ptr + p->sq_off.head;
sq->ktail = sq->ring_ptr + p->sq_off.tail;
sq->kring_mask = sq->ring_ptr + p->sq_off.ring_mask;
@@ -34,19 +54,14 @@ static int io_uring_mmap(int fd, struct io_uring_params *p,
IORING_OFF_SQES);
if (sq->sqes == MAP_FAILED) {
ret = -errno;
+ if (cq->ring_ptr != sq->ring_ptr) {
+ munmap(cq->ring_ptr, cq->ring_sz);
+ }
err:
munmap(sq->ring_ptr, sq->ring_sz);
return ret;
}
- cq->ring_sz = p->cq_off.cqes + p->cq_entries * sizeof(struct io_uring_cqe);
- cq->ring_ptr = mmap(0, cq->ring_sz, PROT_READ | PROT_WRITE,
- MAP_SHARED | MAP_POPULATE, fd, IORING_OFF_CQ_RING);
- if (cq->ring_ptr == MAP_FAILED) {
- ret = -errno;
- munmap(sq->sqes, *sq->kring_entries * sizeof(struct io_uring_sqe));
- goto err;
- }
cq->khead = cq->ring_ptr + p->cq_off.head;
cq->ktail = cq->ring_ptr + p->cq_off.tail;
cq->kring_mask = cq->ring_ptr + p->cq_off.ring_mask;
@@ -105,6 +120,8 @@ void io_uring_queue_exit(struct io_uring *ring)
munmap(sq->sqes, *sq->kring_entries * sizeof(struct io_uring_sqe));
munmap(sq->ring_ptr, sq->ring_sz);
- munmap(cq->ring_ptr, cq->ring_sz);
+ if (cq->ring_ptr != sq->ring_ptr) {
+ munmap(cq->ring_ptr, cq->ring_sz);
+ }
close(ring->ring_fd);
}
--
2.21.0
next prev parent reply other threads:[~2019-09-06 19:13 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-26 17:23 [PATCH] io_uring: allocate the two rings together Hristo Venev
2019-08-27 15:50 ` Jens Axboe
2019-08-27 19:35 ` Hristo Venev
2019-08-29 15:04 ` Jens Axboe
2019-09-06 16:26 ` Jens Axboe
2019-09-06 19:12 ` [PATCH 1/2] liburing/test: There are now 4 reserved fields Hristo Venev
2019-09-06 19:12 ` Hristo Venev [this message]
2019-09-06 19:30 ` [PATCH 2/2] liburing: Use the single mmap feature Jens Axboe
2019-09-06 19:24 ` [PATCH 1/2] liburing/test: There are now 4 reserved fields Jens Axboe
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