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[202.39.79.13]) by smtp.gmail.com with ESMTPSA id q6sm9589537pff.79.2020.06.20.19.10.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 20 Jun 2020 19:10:12 -0700 (PDT) From: Derek Su To: qemu-devel@nongnu.org Subject: [PATCH v1 0/1] COLO: migrate dirty ram pages before colo checkpoint Date: Sun, 21 Jun 2020 10:10:03 +0800 Message-Id: <20200621021004.5559-1-dereksu@qnap.com> X-Mailer: git-send-email 2.17.1 Received-SPF: pass client-ip=2607:f8b0:4864:20::52b; envelope-from=dereksu@qnap.com; helo=mail-pg1-x52b.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. 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=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: zhang.zhanghailiang@huawei.com, chyang@qnap.com, quintela@redhat.com, Derek Su , dgilbert@redhat.com, ctcheng@qnap.com, jwsu1986@gmail.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This series is to reduce the guest's downtime during colo checkpoint by migrating dirty ram pages as many as possible before colo checkpoint. If the iteration count reaches COLO_RAM_MIGRATE_ITERATION_MAX or ram pending size is lower than 'x-colo-migrate-ram-threshold', stop the ram migration and do colo checkpoint. Test environment: The both primary VM and secondary VM has 1GiB ram and 10GbE NIC for FT traffic. One fio buffer write job runs on the guest. The result shows the total primary VM downtime is decreased by ~40%. Please help to review it and suggestions are welcomed. Thanks. Derek Su (1): migration/colo.c: migrate dirty ram pages before colo checkpoint migration/colo.c | 79 ++++++++++++++++++++++++++++++++++++++++++ migration/migration.c | 20 +++++++++++ migration/trace-events | 2 ++ monitor/hmp-cmds.c | 8 +++++ qapi/migration.json | 18 ++++++++-- 5 files changed, 125 insertions(+), 2 deletions(-) -- 2.17.1