From patchwork Thu Feb 29 15:29:54 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabiano Rosas X-Patchwork-Id: 13577272 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E5181C48BF6 for ; Thu, 29 Feb 2024 15:31:31 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rfiMl-0005TQ-RM; Thu, 29 Feb 2024 10:30:35 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rfiMh-0005R7-9Y for qemu-devel@nongnu.org; Thu, 29 Feb 2024 10:30:31 -0500 Received: from smtp-out2.suse.de ([2a07:de40:b251:101:10:150:64:2]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1rfiMb-0005qZ-RG for qemu-devel@nongnu.org; Thu, 29 Feb 2024 10:30:30 -0500 Received: from imap1.dmz-prg2.suse.org (imap1.dmz-prg2.suse.org [10.150.64.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id D8C361F7F6; Thu, 29 Feb 2024 15:30:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1709220622; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=WeZKMKYZrEXwJ12mXttpzW480bpIspYp3MAFmFvfwwA=; b=YURW8xlw++RdlHW7JVXoMEAQZ0F8yz3gcFmP9G4Fe3qDwDRqPMuXx+5gvJsQ+Ytn6P2Dg7 RXbE7xhgPIAYetVxBUzql37Gxzyy8/Bfevr9tWABKHElQFr7wIBkCOs6flciBLK+d5W1/7 veK4vMYf4Nqx1U47gNphqIviguyFS4E= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1709220622; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=WeZKMKYZrEXwJ12mXttpzW480bpIspYp3MAFmFvfwwA=; b=JDm7Dij4CxFAwiXIILE/gV3ulgzK5ne4S3rwxecppTJsD2himtU8KtLLvSNk7M4YquhD0l vXPcdF+m+1ClxUDA== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1709220621; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=WeZKMKYZrEXwJ12mXttpzW480bpIspYp3MAFmFvfwwA=; b=BqwhZuVT1YUukGA7ZziV/Fbg8FwKVvu7goB/rUFeIB7bJHuvfAyuTZ60f4bvrqkvszVA6G FDsgnx5oq3DPdfdgBYtX1YYuIcvtwL4RzB7kyFVJZkfVPLIqFMLkf/3GuZXzCFTU6PQjUV 9ocYoLs8LlP8pP6Z/JKuciifMCftYT8= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1709220621; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=WeZKMKYZrEXwJ12mXttpzW480bpIspYp3MAFmFvfwwA=; b=tcjsj2v4CnfYPjBgPj0AISgoerkuS0ewSVCB+qgedHUCczrp2He4vUPJLtADXy3LpZnszp QxHtQ1DUrYNxQpDw== Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 42E1C13503; Thu, 29 Feb 2024 15:30:20 +0000 (UTC) Received: from dovecot-director2.suse.de ([10.150.64.162]) by imap1.dmz-prg2.suse.org with ESMTPSA id Yw6yAgyj4GU/MAAAD6G6ig (envelope-from ); Thu, 29 Feb 2024 15:30:20 +0000 From: Fabiano Rosas To: qemu-devel@nongnu.org Cc: berrange@redhat.com, armbru@redhat.com, Peter Xu , Claudio Fontana Subject: [PATCH v6 00/23] migration: File based migration with multifd and mapped-ram Date: Thu, 29 Feb 2024 12:29:54 -0300 Message-Id: <20240229153017.2221-1-farosas@suse.de> X-Mailer: git-send-email 2.35.3 MIME-Version: 1.0 Authentication-Results: smtp-out2.suse.de; none X-Spamd-Result: default: False [-2.10 / 50.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; RCPT_COUNT_FIVE(0.00)[5]; RCVD_COUNT_THREE(0.00)[3]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; MID_CONTAINS_FROM(1.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[gitlab.com:url]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_ALL(0.00)[]; BAYES_HAM(-3.00)[100.00%] Received-SPF: pass client-ip=2a07:de40:b251:101:10:150:64:2; envelope-from=farosas@suse.de; helo=smtp-out2.suse.de X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Based-on: 74aa0fb297 (migration: options incompatible with cpr) # peterx/migration-next Hi, In this v6: - Minor fixes to 17/23 and 19/23 CI run: https://gitlab.com/farosas/qemu/-/pipelines/1195796010 Series structure ================ This series enables mapped-ram in steps: 0) Cleanups [1] 1) QIOChannel interfaces [2-6] 2) Mapped-ram format for precopy [7-11] 3) Multifd adaptation without packets [12-15] 4) Mapped-ram format for multifd [16-23] * below will be sent separately * 5) Direct-io generic support [TODO] 6) Direct-io for mapped-ram multifd with file: URI [TODO] 7) Fdset interface for mapped-ram multifd [TODO] About mapped-ram ================ Mapped-ram is a new stream format for the RAM section designed to supplement the existing ``file:`` migration and make it compatible with ``multifd``. This enables parallel migration of a guest's RAM to a file. The core of the feature is to map RAM pages to migration file offsets. This enables the ``multifd`` threads to write exclusively to those offsets even if the guest is constantly dirtying pages (i.e. live migration). Another benefit is that the resulting file will have a bounded size, since pages which are dirtied multiple times will always go to a fixed location in the file, rather than constantly being added to a sequential stream. Having the pages at fixed offsets also allows the usage of O_DIRECT for save/restore of the migration stream as the pages are ensured to be written respecting O_DIRECT alignment restrictions. Latest numbers (unchanged from v4) ============== => guest: 128 GB RAM - 120 GB dirty - 1 vcpu in tight loop dirtying memory => host: 128 CPU AMD EPYC 7543 - 2 NVMe disks in RAID0 (8586 MiB/s) - xfs => pinned vcpus w/ NUMA shortest distances - average of 3 runs - results from query-migrate non-live | time (ms) pages/s mb/s MB/s -------------------+----------------------------------- file | 110512 256258 9549 1193 + bg-snapshot | 245660 119581 4303 537 -------------------+----------------------------------- mapped-ram | 157975 216877 6672 834 + multifd 8 ch. | 95922 292178 10982 1372 + direct-io | 23268 1936897 45330 5666 ------------------------------------------------------- live | time (ms) pages/s mb/s MB/s -------------------+----------------------------------- file | - - - - (file grew 4x the VM size) + bg-snapshot | 357635 141747 2974 371 -------------------+----------------------------------- mapped-ram | - - - - (no convergence in 5 min) + multifd 8 ch. | 230812 497551 14900 1862 + direct-io | 27475 1788025 46736 5842 ------------------------------------------------------- v5: https://lore.kernel.org/r/20240228152127.18769-1-farosas@suse.de v4: https://lore.kernel.org/r/20240220224138.24759-1-farosas@suse.de v3: https://lore.kernel.org/r/20231127202612.23012-1-farosas@suse.de v2: https://lore.kernel.org/r/20231023203608.26370-1-farosas@suse.de v1: https://lore.kernel.org/r/20230330180336.2791-1-farosas@suse.de Fabiano Rosas (20): migration/multifd: Cleanup multifd_recv_sync_main io: fsync before closing a file channel migration/qemu-file: add utility methods for working with seekable channels migration/ram: Introduce 'mapped-ram' migration capability migration: Add mapped-ram URI compatibility check migration/ram: Add outgoing 'mapped-ram' migration migration/ram: Add incoming 'mapped-ram' migration tests/qtest/migration: Add tests for mapped-ram file-based migration migration/multifd: Rename MultiFDSend|RecvParams::data to compress_data migration/multifd: Decouple recv method from pages migration/multifd: Allow multifd without packets migration/multifd: Allow receiving pages without packets migration/multifd: Add a wrapper for channels_created migration/multifd: Add outgoing QIOChannelFile support migration/multifd: Add incoming QIOChannelFile support migration/multifd: Prepare multifd sync for mapped-ram migration migration/multifd: Support outgoing mapped-ram stream format migration/multifd: Support incoming mapped-ram stream format migration/multifd: Add mapped-ram support to fd: URI tests/qtest/migration: Add a multifd + mapped-ram migration test Nikolay Borisov (3): io: add and implement QIO_CHANNEL_FEATURE_SEEKABLE for channel file io: Add generic pwritev/preadv interface io: implement io_pwritev/preadv for QIOChannelFile docs/devel/migration/features.rst | 1 + docs/devel/migration/mapped-ram.rst | 138 ++++++++++ include/exec/ramblock.h | 13 + include/io/channel.h | 83 ++++++ include/migration/qemu-file-types.h | 2 + include/qemu/bitops.h | 13 + io/channel-file.c | 69 +++++ io/channel.c | 58 ++++ migration/fd.c | 44 +++ migration/fd.h | 2 + migration/file.c | 149 +++++++++- migration/file.h | 8 + migration/migration.c | 56 +++- migration/multifd-zlib.c | 26 +- migration/multifd-zstd.c | 26 +- migration/multifd.c | 405 ++++++++++++++++++++++------ migration/multifd.h | 27 +- migration/options.c | 35 +++ migration/options.h | 1 + migration/qemu-file.c | 106 ++++++++ migration/qemu-file.h | 6 + migration/ram.c | 345 ++++++++++++++++++++++-- migration/ram.h | 1 + migration/savevm.c | 1 + migration/trace-events | 2 +- qapi/migration.json | 6 +- tests/qtest/migration-test.c | 127 +++++++++ 27 files changed, 1607 insertions(+), 143 deletions(-) create mode 100644 docs/devel/migration/mapped-ram.rst