From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 906581A9F8C for ; Mon, 1 Sep 2025 10:02:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756720977; cv=none; b=azaxaO6Hil9MCGkTwoHdDIbWPgKLdAiQeKv3qbhTyh6CWXzpEwSFRoLBoWXlxMcBRmq5ZnIwgJjI6ImykMwf8au5IGtqhXx3kAj3OAEH2we1TwOq6P/VYhsfmGKGYSbr6avVsyOc6RWh6sFGkzWtvB9DYBLfZeHfMbRjTmCMXLM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756720977; c=relaxed/simple; bh=Q6zGO7uiPA/2rX2ZBn8KT9Mrjlgez6p/EgOH20/wWfg=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=S3+bnqsrnyxhJJlGosM3JuXs+1vMF4PhDmQWRwlur4PmYoUzVCyfwBq32Km5YaGbuddrlT0Tcc5hnS8npZb0R41FPNqBWU39/qP5JdZN1ExC0PSqaqr/wQHJF3/4DZRPA+vWh/GzJwj16TYE2AAyEzeyVdi2EIVyFPoF/dpkcEs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=IrDPFRgS; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="IrDPFRgS" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1756720974; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=FcgwTCck96hmtVaUIWTvtBdoB4O8lXvfgaZyvdNdAzg=; b=IrDPFRgSHl0MJut43CNcYlgMZwneB32slAGdPg2QQoCzznyyd8++kyiic+z/sAT6+mgxoD IneJKBzFv14eTClcyPQSUI+rol4gufBpJY3O8v1zY9AxRzSBEIH8wSWqGET+DZkUPNncF2 QuQVAphPTs5DeV1LYVf4tE+Gg8zA8BA= Received: from mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-664-00SUfkOmN_2KI88N-3_bIA-1; Mon, 01 Sep 2025 06:02:53 -0400 X-MC-Unique: 00SUfkOmN_2KI88N-3_bIA-1 X-Mimecast-MFC-AGG-ID: 00SUfkOmN_2KI88N-3_bIA_1756720972 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id E3D881800561; Mon, 1 Sep 2025 10:02:51 +0000 (UTC) Received: from localhost (unknown [10.72.116.17]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id C4AB430001B5; Mon, 1 Sep 2025 10:02:50 +0000 (UTC) From: Ming Lei To: Jens Axboe , linux-block@vger.kernel.org Cc: Uday Shankar , Caleb Sander Mateos , Ming Lei Subject: [PATCH 00/23] ublk: add UBLK_F_BATCH_IO Date: Mon, 1 Sep 2025 18:02:17 +0800 Message-ID: <20250901100242.3231000-1-ming.lei@redhat.com> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Hello, This patchset adds UBLK_F_BATCH_IO feature for communicating between kernel and ublk server in batching way: - **Per-queue vs Per-I/O**: Commands operate on queues rather than individual I/Os - **Batch processing**: Multiple I/Os are handled in single operation - **Multishot commands**: Use io_uring multishot for reducing submission overhead - **Flexible task assignment**: Any task can handle any I/O (no per-I/O daemons) - **Better load balancing**: Tasks can adjust their workload dynamically - **help for following future optimizations**: - blk-mq batch tags allocation/free, - easier to support io-poll - per-task batch for avoiding per-io lock selftest for this feature are provided. This patchset depends on uring_cmd multishot support, which is merged to for-6.18/io_uring. Thanks, Ming Ming Lei (23): ublk: add parameter `struct io_uring_cmd *` to ublk_prep_auto_buf_reg() ublk: add `union ublk_io_buf` with improved naming ublk: refactor auto buffer register in ublk_dispatch_req() ublk: add helper of __ublk_fetch() ublk: define ublk_ch_batch_io_fops for the coming feature F_BATCH_IO ublk: prepare for not tracking task context for command batch ublk: add new batch command UBLK_U_IO_PREP_IO_CMDS & UBLK_U_IO_COMMIT_IO_CMDS ublk: handle UBLK_U_IO_PREP_IO_CMDS ublk: handle UBLK_U_IO_COMMIT_IO_CMDS ublk: add io events fifo structure ublk: add batch I/O dispatch infrastructure ublk: add UBLK_U_IO_FETCH_IO_CMDS for batch I/O processing ublk: abort requests filled in event kfifo ublk: add new feature UBLK_F_BATCH_IO ublk: document feature UBLK_F_BATCH_IO selftests: ublk: replace assert() with ublk_assert() selftests: ublk: add ublk_io_buf_idx() for returning io buffer index selftests: ublk: add batch buffer management infrastructure selftests: ublk: handle UBLK_U_IO_PREP_IO_CMDS selftests: ublk: handle UBLK_U_IO_COMMIT_IO_CMDS selftests: ublk: handle UBLK_U_IO_FETCH_IO_CMDS selftests: ublk: add --batch/-b for enabling F_BATCH_IO selftests: ublk: support arbitrary threads/queues combination Documentation/block/ublk.rst | 60 +- drivers/block/ublk_drv.c | 1208 +++++++++++++++-- include/uapi/linux/ublk_cmd.h | 91 ++ tools/testing/selftests/ublk/Makefile | 7 +- tools/testing/selftests/ublk/batch.c | 610 +++++++++ tools/testing/selftests/ublk/common.c | 2 +- tools/testing/selftests/ublk/file_backed.c | 11 +- tools/testing/selftests/ublk/kublk.c | 128 +- tools/testing/selftests/ublk/kublk.h | 190 ++- tools/testing/selftests/ublk/null.c | 18 +- tools/testing/selftests/ublk/stripe.c | 17 +- .../testing/selftests/ublk/test_generic_13.sh | 32 + .../testing/selftests/ublk/test_generic_14.sh | 30 + .../testing/selftests/ublk/test_generic_15.sh | 30 + .../testing/selftests/ublk/test_stress_06.sh | 45 + .../testing/selftests/ublk/test_stress_07.sh | 44 + tools/testing/selftests/ublk/utils.h | 64 + 17 files changed, 2431 insertions(+), 156 deletions(-) create mode 100644 tools/testing/selftests/ublk/batch.c create mode 100755 tools/testing/selftests/ublk/test_generic_13.sh create mode 100755 tools/testing/selftests/ublk/test_generic_14.sh create mode 100755 tools/testing/selftests/ublk/test_generic_15.sh create mode 100755 tools/testing/selftests/ublk/test_stress_06.sh create mode 100755 tools/testing/selftests/ublk/test_stress_07.sh -- 2.47.0