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[99.254.144.39]) by smtp.gmail.com with ESMTPSA id x11-20020a0cfe0b000000b0065af657ddf7sm2330515qvr.144.2023.10.22.13.12.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 22 Oct 2023 13:12:33 -0700 (PDT) From: Peter Xu To: qemu-devel@nongnu.org Cc: Juan Quintela , Fabiano Rosas , peterx@redhat.com Subject: [PATCH RFC 0/7] migration/multifd: quit unitifications and separate sync packet Date: Sun, 22 Oct 2023 16:12:04 -0400 Message-ID: <20231022201211.452861-1-peterx@redhat.com> X-Mailer: git-send-email 2.41.0 MIME-Version: 1.0 Received-SPF: pass client-ip=170.10.129.124; envelope-from=peterx@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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=0.001, RCVD_IN_MSPIKE_WL=0.001, 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 This is an RFC series, at least for 9.0, so not urgent for this release. Just for early reviews. Said so, patch 1 could be a bugfix, didn't copy stable as I don't think it's worthwhile. Maybe worth picking up even soon. This series majorly does two things as mentioned in the subject, namely: 1) Quit unifications: after read Fabiano's patch, I moved that further to drop p->quit, meanwhile I found some path that may miss things here and there. Got all of them cleaned/fixed up. 2) Separate SYNC packet: it seems the SYNC packet is confusing in multifd, where it's the only case that main thread can modify p->flags too. The field "pending_job" is also confusing to be an integer. Split it can be helpful to make multifd code more readable, meanwhile making pending_job a boolean (with yet another one added pending_sync for SYNC). I think I'm more confident 1) is a good idea, maybe not 2). The last patch I put it last because I think it reduces duplication, but I'm not sure whether that's a common flavour of how code should be written. Let me know your opinions. Thanks, Peter Xu (7): migration: Drop stale comment for multifd zero copy migration: Fix error leak in multifd_tls_outgoing_handshake() migration: multifd_send_kick_main() migration: Drop MultiFDSendParams.quit and cleanup error paths migration: Modulize multifd send threads with a few helpers migration: Split multifd pending_job into two booleans migration: Further unify paths for multifd normal or sync requests migration/multifd.h | 18 +-- migration/multifd.c | 307 +++++++++++++++++++++++--------------------- 2 files changed, 170 insertions(+), 155 deletions(-)