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] io_uring: add io_uring_event cache hit information Date: Mon, 11 Feb 2019 12:00:31 -0700 [thread overview] Message-ID: <20190211190049.7888-3-axboe@kernel.dk> (raw) In-Reply-To: <20190211190049.7888-1-axboe@kernel.dk> Add hint on whether a read was served out of the page cache, or if it hit media. This is useful for buffered async IO, O_DIRECT reads would never have this set (for obvious reasons). If the read hit page cache, cqe->flags will have IOCQE_FLAG_CACHEHIT set. Signed-off-by: Jens Axboe <axboe@kernel.dk> --- fs/io_uring.c | 7 ++++++- include/uapi/linux/io_uring.h | 5 +++++ 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index 00c7c11ca699..8114723517d6 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -611,11 +611,16 @@ static void io_fput(struct io_kiocb *req) static void io_complete_rw(struct kiocb *kiocb, long res, long res2) { struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw); + unsigned ev_flags = 0; kiocb_end_write(kiocb); io_fput(req); - io_cqring_add_event(req->ctx, req->user_data, res, 0); + + if (res > 0 && (req->flags & REQ_F_FORCE_NONBLOCK)) + ev_flags = IOCQE_FLAG_CACHEHIT; + + io_cqring_add_event(req->ctx, req->user_data, res, ev_flags); io_free_req(req); } diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index e23408692118..24906e99fdc7 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -69,6 +69,11 @@ struct io_uring_cqe { __u32 flags; }; +/* + * io_uring_event->flags + */ +#define IOCQE_FLAG_CACHEHIT (1U << 0) /* IO did not hit media */ + /* * Magic offsets for the application to mmap the data it needs */ -- 2.17.1
WARNING: multiple messages have this Message-ID (diff)
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] io_uring: add io_uring_event cache hit information Date: Mon, 11 Feb 2019 12:00:31 -0700 [thread overview] Message-ID: <20190211190049.7888-3-axboe@kernel.dk> (raw) In-Reply-To: <20190211190049.7888-1-axboe@kernel.dk> Add hint on whether a read was served out of the page cache, or if it hit media. This is useful for buffered async IO, O_DIRECT reads would never have this set (for obvious reasons). If the read hit page cache, cqe->flags will have IOCQE_FLAG_CACHEHIT set. Signed-off-by: Jens Axboe <axboe@kernel.dk> --- fs/io_uring.c | 7 ++++++- include/uapi/linux/io_uring.h | 5 +++++ 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index 00c7c11ca699..8114723517d6 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -611,11 +611,16 @@ static void io_fput(struct io_kiocb *req) static void io_complete_rw(struct kiocb *kiocb, long res, long res2) { struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw); + unsigned ev_flags = 0; kiocb_end_write(kiocb); io_fput(req); - io_cqring_add_event(req->ctx, req->user_data, res, 0); + + if (res > 0 && (req->flags & REQ_F_FORCE_NONBLOCK)) + ev_flags = IOCQE_FLAG_CACHEHIT; + + io_cqring_add_event(req->ctx, req->user_data, res, ev_flags); io_free_req(req); } diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index e23408692118..24906e99fdc7 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -69,6 +69,11 @@ struct io_uring_cqe { __u32 flags; }; +/* + * io_uring_event->flags + */ +#define IOCQE_FLAG_CACHEHIT (1U << 0) /* IO did not hit media */ + /* * Magic offsets for the application to mmap the data it needs */ -- 2.17.1 -- To unsubscribe, send a message with 'unsubscribe linux-aio' in the body to majordomo@kvack.org. For more info on Linux AIO, see: http://www.kvack.org/aio/ Don't email: <a href=mailto:"aart@kvack.org">aart@kvack.org</a>
next prev parent reply other threads:[~2019-02-11 19:00 UTC|newest] Thread overview: 109+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-02-11 19:00 [PATCHSET v15] io_uring IO interface Jens Axboe 2019-02-11 19:00 ` Jens Axboe 2019-02-11 19:00 ` [PATCH 01/19] fs: add an iopoll method to struct file_operations Jens Axboe 2019-02-11 19:00 ` Jens Axboe 2019-02-11 19:00 ` Jens Axboe [this message] 2019-02-11 19:00 ` [PATCH] io_uring: add io_uring_event cache hit information Jens Axboe 2019-02-11 19:00 ` [PATCH 02/19] block: wire up block device iopoll method Jens Axboe 2019-02-11 19:00 ` Jens Axboe 2019-02-11 19:00 ` [PATCH 03/19] block: add bio_set_polled() helper Jens Axboe 2019-02-11 19:00 ` Jens Axboe 2019-02-11 19:00 ` [PATCH 04/19] iomap: wire up the iopoll method Jens Axboe 2019-02-11 19:00 ` Jens Axboe 2019-02-11 19:00 ` [PATCH 05/19] Add io_uring IO interface Jens Axboe 2019-02-11 19:00 ` Jens Axboe 2019-02-11 19:00 ` [PATCH 06/19] io_uring: add fsync support Jens Axboe 2019-02-11 19:00 ` Jens Axboe 2019-02-11 19:00 ` [PATCH 07/19] io_uring: support for IO polling Jens Axboe 2019-02-11 19:00 ` Jens Axboe 2019-02-11 19:00 ` [PATCH 08/19] fs: add fget_many() and fput_many() Jens Axboe 2019-02-11 19:00 ` Jens Axboe 2019-02-11 19:00 ` [PATCH 09/19] io_uring: use fget/fput_many() for file references Jens Axboe 2019-02-11 19:00 ` Jens Axboe 2019-02-11 19:00 ` [PATCH 10/19] io_uring: batch io_kiocb allocation Jens Axboe 2019-02-11 19:00 ` Jens Axboe 2019-02-11 19:00 ` [PATCH 11/19] block: implement bio helper to add iter bvec pages to bio Jens Axboe 2019-02-11 19:00 ` Jens Axboe 2019-02-20 22:58 ` Ming Lei 2019-02-20 22:58 ` Ming Lei 2019-02-21 17:45 ` Jens Axboe 2019-02-21 17:45 ` Jens Axboe 2019-02-26 3:46 ` Eric Biggers 2019-02-26 3:46 ` Eric Biggers 2019-02-26 4:34 ` Jens Axboe 2019-02-26 4:34 ` Jens Axboe 2019-02-26 15:54 ` Jens Axboe 2019-02-26 15:54 ` Jens Axboe 2019-02-27 1:21 ` Ming Lei 2019-02-27 1:21 ` Ming Lei 2019-02-27 1:47 ` Jens Axboe 2019-02-27 1:47 ` Jens Axboe 2019-02-27 1:53 ` Ming Lei 2019-02-27 1:53 ` Ming Lei 2019-02-27 1:57 ` Jens Axboe 2019-02-27 1:57 ` Jens Axboe 2019-02-27 2:03 ` Jens Axboe 2019-02-27 2:21 ` Ming Lei 2019-02-27 2:21 ` Ming Lei 2019-02-27 2:28 ` Jens Axboe 2019-02-27 2:28 ` Jens Axboe 2019-02-27 2:37 ` Ming Lei 2019-02-27 2:37 ` Ming Lei 2019-02-27 2:43 ` Jens Axboe 2019-02-27 2:43 ` Jens Axboe 2019-02-27 3:09 ` Ming Lei 2019-02-27 3:09 ` Ming Lei 2019-02-27 3:37 ` Jens Axboe 2019-02-27 3:37 ` Jens Axboe 2019-02-27 3:43 ` Jens Axboe 2019-02-27 3:43 ` Jens Axboe 2019-02-27 3:44 ` Ming Lei 2019-02-27 3:44 ` Ming Lei 2019-02-27 4:05 ` Jens Axboe 2019-02-27 4:05 ` Jens Axboe 2019-02-27 4:06 ` Jens Axboe 2019-02-27 4:06 ` Jens Axboe 2019-02-27 19:42 ` Christoph Hellwig 2019-02-27 19:42 ` Christoph Hellwig 2019-02-28 8:37 ` Ming Lei 2019-02-28 8:37 ` Ming Lei 2019-02-27 23:35 ` Ming Lei 2019-02-27 23:35 ` Ming Lei 2019-03-08 7:55 ` Christoph Hellwig 2019-03-08 7:55 ` Christoph Hellwig 2019-03-08 9:12 ` Ming Lei 2019-03-08 9:12 ` Ming Lei 2019-03-08 8:18 ` Christoph Hellwig 2019-03-08 8:18 ` Christoph Hellwig 2019-02-11 19:00 ` [PATCH 12/19] io_uring: add support for pre-mapped user IO buffers Jens Axboe 2019-02-11 19:00 ` Jens Axboe 2019-02-19 19:08 ` Jann Horn 2019-02-19 19:08 ` Jann Horn 2019-02-22 22:29 ` Jens Axboe 2019-02-22 22:29 ` Jens Axboe 2019-02-11 19:00 ` [PATCH 13/19] net: split out functions related to registering inflight socket files Jens Axboe 2019-02-11 19:00 ` Jens Axboe 2019-02-11 19:00 ` [PATCH 14/19] io_uring: add file set registration Jens Axboe 2019-02-11 19:00 ` Jens Axboe 2019-02-19 16:12 ` Jann Horn 2019-02-19 16:12 ` Jann Horn 2019-02-22 22:29 ` Jens Axboe 2019-02-22 22:29 ` Jens Axboe 2019-02-11 19:00 ` [PATCH 15/19] io_uring: add submission polling Jens Axboe 2019-02-11 19:00 ` Jens Axboe 2019-02-11 19:00 ` [PATCH 16/19] io_uring: add io_kiocb ref count Jens Axboe 2019-02-11 19:00 ` Jens Axboe 2019-02-11 19:00 ` [PATCH 17/19] io_uring: add support for IORING_OP_POLL Jens Axboe 2019-02-11 19:00 ` Jens Axboe 2019-02-11 19:00 ` [PATCH 18/19] io_uring: allow workqueue item to handle multiple buffered requests Jens Axboe 2019-02-11 19:00 ` Jens Axboe 2019-02-11 19:00 ` [PATCH 19/19] io_uring: add io_uring_event cache hit information Jens Axboe 2019-02-11 19:00 ` Jens Axboe 2019-02-21 12:10 ` [PATCHSET v15] io_uring IO interface Marek Majkowski 2019-02-21 12:10 ` Marek Majkowski 2019-02-21 17:48 ` Jens Axboe 2019-02-21 17:48 ` Jens Axboe 2019-02-22 15:01 ` Marek Majkowski 2019-02-22 15:01 ` Marek Majkowski 2019-02-22 22:32 ` Jens Axboe 2019-02-22 22:32 ` Jens Axboe
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