From: Jens Axboe <axboe@kernel.dk>
To: linux-aio@kvack.org, linux-block@vger.kernel.org,
linux-api@vger.kernel.org
Cc: hch@lst.de, jmoyer@redhat.com, avi@scylladb.com,
jannh@google.com, viro@ZenIV.linux.org.uk,
Jens Axboe <axboe@kernel.dk>
Subject: [PATCH 10/19] io_uring: batch io_kiocb allocation
Date: Sat, 9 Feb 2019 14:13:37 -0700
Message-ID: <20190209211346.26060-11-axboe@kernel.dk> (raw)
In-Reply-To: <20190209211346.26060-1-axboe@kernel.dk>
Similarly to how we use the state->ios_left to know how many references
to get to a file, we can use it to allocate the io_kiocb's we need in
bulk.
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
fs/io_uring.c | 45 ++++++++++++++++++++++++++++++++++++++-------
1 file changed, 38 insertions(+), 7 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index faf329e81570..d9f7e90766c8 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -148,6 +148,13 @@ struct io_kiocb {
struct io_submit_state {
struct blk_plug plug;
+ /*
+ * io_kiocb alloc cache
+ */
+ void *reqs[IO_IOPOLL_BATCH];
+ unsigned int free_reqs;
+ unsigned int cur_req;
+
/*
* File reference cache
*/
@@ -281,20 +288,40 @@ static void io_ring_drop_ctx_refs(struct io_ring_ctx *ctx, unsigned refs)
wake_up(&ctx->wait);
}
-static struct io_kiocb *io_get_req(struct io_ring_ctx *ctx)
+static struct io_kiocb *io_get_req(struct io_ring_ctx *ctx,
+ struct io_submit_state *state)
{
struct io_kiocb *req;
if (!percpu_ref_tryget(&ctx->refs))
return NULL;
- req = kmem_cache_alloc(req_cachep, __GFP_NOWARN);
- if (req) {
- req->ctx = ctx;
- req->flags = 0;
- return req;
+ if (!state) {
+ req = kmem_cache_alloc(req_cachep, __GFP_NOWARN);
+ if (unlikely(!req))
+ goto out;
+ } else if (!state->free_reqs) {
+ size_t sz;
+ int ret;
+
+ sz = min_t(size_t, state->ios_left, ARRAY_SIZE(state->reqs));
+ ret = kmem_cache_alloc_bulk(req_cachep, __GFP_NOWARN, sz,
+ state->reqs);
+ if (unlikely(ret <= 0))
+ goto out;
+ state->free_reqs = ret - 1;
+ state->cur_req = 1;
+ req = state->reqs[0];
+ } else {
+ req = state->reqs[state->cur_req];
+ state->free_reqs--;
+ state->cur_req++;
}
+ req->ctx = ctx;
+ req->flags = 0;
+ return req;
+out:
io_ring_drop_ctx_refs(ctx, 1);
return NULL;
}
@@ -980,7 +1007,7 @@ static int io_submit_sqe(struct io_ring_ctx *ctx, const struct sqe_submit *s,
if (unlikely(s->sqe->flags))
return -EINVAL;
- req = io_get_req(ctx);
+ req = io_get_req(ctx, state);
if (unlikely(!req))
return -EAGAIN;
@@ -1006,6 +1033,9 @@ static void io_submit_state_end(struct io_submit_state *state)
{
blk_finish_plug(&state->plug);
io_file_put(state, NULL);
+ if (state->free_reqs)
+ kmem_cache_free_bulk(req_cachep, state->free_reqs,
+ &state->reqs[state->cur_req]);
}
/*
@@ -1015,6 +1045,7 @@ static void io_submit_state_start(struct io_submit_state *state,
struct io_ring_ctx *ctx, unsigned max_ios)
{
blk_start_plug(&state->plug);
+ state->free_reqs = 0;
state->file = NULL;
state->ios_left = max_ios;
}
--
2.17.1
next prev parent reply index
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-09 21:13 [PATCHSET v14] io_uring IO interface Jens Axboe
2019-02-09 21:13 ` [PATCH 01/19] fs: add an iopoll method to struct file_operations Jens Axboe
2019-02-09 21:13 ` [PATCH 02/19] block: wire up block device iopoll method Jens Axboe
2019-02-09 21:13 ` [PATCH 03/19] block: add bio_set_polled() helper Jens Axboe
2019-02-09 21:13 ` [PATCH 04/19] iomap: wire up the iopoll method Jens Axboe
2019-02-09 21:13 ` [PATCH 05/19] Add io_uring IO interface Jens Axboe
2019-02-10 12:03 ` Thomas Gleixner
2019-02-10 14:19 ` Jens Axboe
2019-02-09 21:13 ` [PATCH 06/19] io_uring: add fsync support Jens Axboe
2019-02-09 21:13 ` [PATCH 07/19] io_uring: support for IO polling Jens Axboe
2019-02-09 21:13 ` [PATCH 08/19] fs: add fget_many() and fput_many() Jens Axboe
2019-02-09 21:13 ` [PATCH 09/19] io_uring: use fget/fput_many() for file references Jens Axboe
2019-02-09 21:13 ` Jens Axboe [this message]
2019-02-09 21:13 ` [PATCH 11/19] block: implement bio helper to add iter bvec pages to bio Jens Axboe
2019-02-09 21:13 ` [PATCH 12/19] io_uring: add support for pre-mapped user IO buffers Jens Axboe
2019-02-09 21:13 ` [PATCH 13/19] net: split out functions related to registering inflight socket files Jens Axboe
2019-02-09 21:13 ` [PATCH 14/19] io_uring: add file set registration Jens Axboe
2019-02-09 23:52 ` Matt Mullins
2019-02-10 0:47 ` Jens Axboe
[not found] ` <60e4c6a489549daad1fb2c5e8eee5496c668d79a.camel@fb.com>
2019-02-10 2:34 ` Jens Axboe
2019-02-10 2:57 ` Jens Axboe
2019-02-10 19:55 ` Matt Mullins
2019-02-09 21:13 ` [PATCH 15/19] io_uring: add submission polling Jens Axboe
2019-02-09 21:13 ` [PATCH 16/19] io_uring: add io_kiocb ref count Jens Axboe
2019-02-10 9:19 ` Hannes Reinecke
2019-02-09 21:13 ` [PATCH 17/19] io_uring: add support for IORING_OP_POLL Jens Axboe
2019-02-10 9:28 ` Hannes Reinecke
2019-02-09 21:13 ` [PATCH 18/19] io_uring: allow workqueue item to handle multiple buffered requests Jens Axboe
2019-02-10 9:31 ` Hannes Reinecke
2019-02-09 21:13 ` [PATCH 19/19] io_uring: add io_uring_event cache hit information Jens Axboe
2019-02-10 9:36 ` Hannes Reinecke
2019-02-10 13:39 ` Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2019-02-11 19:00 [PATCHSET v15] io_uring IO interface Jens Axboe
2019-02-11 19:00 ` [PATCH 10/19] io_uring: batch io_kiocb allocation Jens Axboe
2019-02-08 17:34 [PATCHSET v13] io_uring IO interface Jens Axboe
2019-02-08 17:34 ` [PATCH 10/19] io_uring: batch io_kiocb allocation Jens Axboe
2019-02-09 9:43 ` Hannes Reinecke
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