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Mon, 09 Sep 2024 06:48:33 -0700 (PDT) Received: from localhost.localdomain ([118.114.94.226]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2dab2c6b0b9sm7841031a91.0.2024.09.09.06.48.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Sep 2024 06:48:32 -0700 (PDT) From: Hyman Huang To: qemu-devel@nongnu.org Cc: Peter Xu , Fabiano Rosas , Eric Blake , Markus Armbruster , David Hildenbrand , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Paolo Bonzini , yong.huang@smartx.com Subject: [PATCH RFC 00/10] migration: auto-converge refinements for huge VM Date: Mon, 9 Sep 2024 21:47:12 +0800 Message-Id: X-Mailer: git-send-email 2.39.1 MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::52b; envelope-from=yong.huang@smartx.com; helo=mail-pg1-x52b.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Currently, a huge VM with high memory overload may take a long time to increase its maximum throttle percentage. The root cause is that the current auto-converge throttle logic doesn't look like it will scale because migration_trigger_throttle() is only called for each iteration, so it won't be invoked for a long time if one iteration can take a long time. This patchset provides two refinements aiming at the above case. 1: The periodic CPU throttle. As Peter points out, "throttle only for each sync, sync for each iteration" may make sense in the old days, but perhaps not anymore. So we introduce perioidic CPU throttle implementation for migration, which is a trade-off between synchronization overhead and CPU throttle impact. 2: The responsive CPU throttle. We present new criteria called "dirty ratio" to help improve the detection accuracy and hence accelerate the throttle's invocation. The RFC version of the refinement may be a rudimentary implementation, I would appreciate hearing more feedback. Yong, thanks. Hyman Huang (10): migration: Introduce structs for periodic CPU throttle migration: Refine util functions to support periodic CPU throttle qapi/migration: Introduce periodic CPU throttling parameters qapi/migration: Introduce the iteration-count migration: Introduce util functions for periodic CPU throttle migration: Support periodic CPU throttle tests/migration-tests: Add test case for periodic throttle migration: Introduce cpu-responsive-throttle parameter migration: Support responsive CPU throttle tests/migration-tests: Add test case for responsive CPU throttle include/exec/ram_addr.h | 117 ++++++++++++++++-- include/exec/ramblock.h | 45 +++++++ migration/migration-hmp-cmds.c | 25 ++++ migration/migration-stats.h | 4 + migration/migration.c | 12 ++ migration/options.c | 74 +++++++++++ migration/options.h | 3 + migration/ram.c | 218 ++++++++++++++++++++++++++++++--- migration/ram.h | 4 + migration/trace-events | 4 + qapi/migration.json | 45 ++++++- tests/qtest/migration-test.c | 77 +++++++++++- 12 files changed, 600 insertions(+), 28 deletions(-)