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bh=IEAFON+hr5+n1awEgCwMEXAzM+U05ZCkmeleR6HDrlU=; b=HcyWgtO++1EefDyNfHcIKkxNzyeQkAUj0E3y1xld9w/ePhaqWzg22Ngprw3TCn6rpe77dK Cwin5Nql9RjxdVpPsQ+6PV2GcBcbo+KMUPCY2sZMZ6ciEbkq87Ut64snXcUy4ooIEmxud6 F8F9XrB4h2KCnLhxDBxnmtr/2SUSwIA= X-MC-Unique: NfF8E6MEP6igM5QSH257xA-1 From: Prasad Pandit To: qemu-block@nongnu.org Cc: qemu-devel@nongnu.org, kwolf@redhat.com, stefanha@redhat.com, Prasad Pandit Subject: [PATCH v2] linux-aio: add IO_CMD_FDSYNC command support Date: Mon, 11 Mar 2024 11:13:33 +0530 Message-ID: <20240311054333.1264776-1-ppandit@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.8 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=ppandit@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.945, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1710135878977100001 Content-Type: text/plain; charset="utf-8" From: Prasad Pandit Libaio defines IO_CMD_FDSYNC command to sync all outstanding asynchronous I/O operations, by flushing out file data to the disk storage. Enable linux-aio to submit such aio request. This helps to reduce latency induced via pthread_create calls by thread-pool (aio=3Dthreads). Signed-off-by: Prasad Pandit Reviewed-by: Stefan Hajnoczi --- block/file-posix.c | 12 ++++++++++++ block/linux-aio.c | 5 ++++- 2 files changed, 16 insertions(+), 1 deletion(-) v2: if IO_CMD_FDSYNC is not supported by the kernel, fallback on thread-pool flush. -> https://lists.nongnu.org/archive/html/qemu-devel/2024-03/msg01986.html diff --git a/block/file-posix.c b/block/file-posix.c index 35684f7e21..4f2195d01d 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -2599,6 +2599,18 @@ static int coroutine_fn raw_co_flush_to_disk(BlockDr= iverState *bs) if (raw_check_linux_io_uring(s)) { return luring_co_submit(bs, s->fd, 0, NULL, QEMU_AIO_FLUSH); } +#endif +#ifdef CONFIG_LINUX_AIO + if (raw_check_linux_aio(s)) { + ret =3D laio_co_submit(s->fd, 0, NULL, QEMU_AIO_FLUSH, 0); + if (ret >=3D 0) { + /* + * if AIO_FLUSH is supported return + * else fallback on thread-pool flush. + */ + return ret; + } + } #endif return raw_thread_pool_submit(handle_aiocb_flush, &acb); } diff --git a/block/linux-aio.c b/block/linux-aio.c index ec05d946f3..d940d029e3 100644 --- a/block/linux-aio.c +++ b/block/linux-aio.c @@ -384,6 +384,9 @@ static int laio_do_submit(int fd, struct qemu_laiocb *l= aiocb, off_t offset, case QEMU_AIO_READ: io_prep_preadv(iocbs, fd, qiov->iov, qiov->niov, offset); break; + case QEMU_AIO_FLUSH: + io_prep_fdsync(iocbs, fd); + break; /* Currently Linux kernel does not support other operations */ default: fprintf(stderr, "%s: invalid AIO request type 0x%x.\n", @@ -412,7 +415,7 @@ int coroutine_fn laio_co_submit(int fd, uint64_t offset= , QEMUIOVector *qiov, AioContext *ctx =3D qemu_get_current_aio_context(); struct qemu_laiocb laiocb =3D { .co =3D qemu_coroutine_self(), - .nbytes =3D qiov->size, + .nbytes =3D qiov ? qiov->size : 0, .ctx =3D aio_get_linux_aio(ctx), .ret =3D -EINPROGRESS, .is_read =3D (type =3D=3D QEMU_AIO_READ), --=20 2.44.0