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[70.53.122.15]) by smtp.gmail.com with ESMTPSA id l38sm2319889qtl.58.2020.09.03.08.26.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 03 Sep 2020 08:26:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1599146812; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=q9eafikgUXeUM2nyemK+4rrXIL5OR+qKMW3xwigy0Do=; b=brND23z47sYRAVHqO/QqTegf4scpbizoAwiELPL6EX6qMeLl93Vpy10sDqad/L5P+TstF4 rGjZh3HsxYb+nB2pe2/JngxXAvbNyXm9rZOO25HcgMhbNwv3cTa8ijWMHRx3+ud3tXCfWE fQZ1qRqqsTX0K8eYy1/7n/2LQLjaw/g= X-MC-Unique: R7K1qk2nPm25vKxMv7kwdw-1 X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=q9eafikgUXeUM2nyemK+4rrXIL5OR+qKMW3xwigy0Do=; b=cfyVjAKCcF4qjVuDMfM805Viz9GcMOXxPmxAyET5WLZVzfGqiBNY1bX0taTnmQTtYI Tib3pq2j/4401Zt+RFKCjmyku5fKfyp62Gmk5Iri4pA80Tqp0HuQGMzPheUA1q7FkAq5 zPaLbTJ9rWdQ3a31yiiJMJ99VIpyj3n1JtaOiaXR81N9BEUg/GQxsebnuyKlnIb2GPyj WY01e3YV/mjmRGWHeeFg8RnObmn5kc9WMjBlmmlYScbn1CyfFL0yBQF5QBWDWgZEUijP 52IZqBHU0fhEBRMv0j7ExjEwYl0sg3N7GZRbr8VIpMiXYLjy+zVyczuJL3bQe5UQzC/8 DYGg== X-Gm-Message-State: AOAM5320J/704eoq0WHyPOD1St7d9yV4AIPdmV4EIe2JGZALnmYEb2ox j09Q7hzvnhGBggqJwDkVO2pBuCuyPZ66f+nFFpjPdbTf15G9M+G/U3SmNB/B768rmbk4ARS3EP2 1Wz14vqhHIdQgFE8= X-Received: by 2002:ac8:474d:: with SMTP id k13mr4050440qtp.20.1599146810641; Thu, 03 Sep 2020 08:26:50 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwa02dLLYxCKWZewAX/vzPnpK9Hkt5gxeRJ1DAD5hd+LVSyV5gy6uyRg5nukDwORqq44rDZ8w== X-Received: by 2002:ac8:474d:: with SMTP id k13mr4050409qtp.20.1599146810383; Thu, 03 Sep 2020 08:26:50 -0700 (PDT) From: Peter Xu To: qemu-devel@nongnu.org Subject: [PATCH 1/5] migration: Rework migrate_send_rp_req_pages() function Date: Thu, 3 Sep 2020 11:26:42 -0400 Message-Id: <20200903152646.93336-2-peterx@redhat.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200903152646.93336-1-peterx@redhat.com> References: <20200903152646.93336-1-peterx@redhat.com> MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=peterx@redhat.com X-Mimecast-Spam-Score: 0.002 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=207.211.31.120; envelope-from=peterx@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/03 00:24:51 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] 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_H2=-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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Xiaohui Li , "Dr . David Alan Gilbert" , peterx@redhat.com, Juan Quintela Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" We duplicated the logic of maintaining the last_rb variable at both callers= of this function. Pass *rb pointer into the function so that we can avoid duplicating the logic. Also, when we have the rb pointer, it's also easier= to remove the original 2nd & 4th parameters, because both of them (name of the ramblock when needed, or the page size) can be fetched from the ramblock pointer too. Signed-off-by: Peter Xu Reviewed-by: Dr. David Alan Gilbert --- migration/migration.c | 26 ++++++++++++++++++-------- migration/migration.h | 4 ++-- migration/postcopy-ram.c | 24 ++---------------------- 3 files changed, 22 insertions(+), 32 deletions(-) diff --git a/migration/migration.c b/migration/migration.c index 58a5452471..6761e3f233 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -311,25 +311,35 @@ error: return ret; } =20 -/* Request a range of pages from the source VM at the given - * start address. - * rbname: Name of the RAMBlock to request the page in, if NULL it's the= same - * as the last request (a name must have been given previously) +/* Request one page from the source VM at the given start address. + * rb: the RAMBlock to request the page in * Start: Address offset within the RB * Len: Length in bytes required - must be a multiple of pagesize */ -int migrate_send_rp_req_pages(MigrationIncomingState *mis, const char *rbn= ame, - ram_addr_t start, size_t len) +int migrate_send_rp_req_pages(MigrationIncomingState *mis, RAMBlock *rb, + ram_addr_t start) { uint8_t bufc[12 + 1 + 255]; /* start (8), len (4), rbname up to 256 */ size_t msglen =3D 12; /* start + len */ + size_t len =3D qemu_ram_pagesize(rb); enum mig_rp_message_type msg_type; + const char *rbname; + int rbname_len; =20 *(uint64_t *)bufc =3D cpu_to_be64((uint64_t)start); *(uint32_t *)(bufc + 8) =3D cpu_to_be32((uint32_t)len); =20 - if (rbname) { - int rbname_len =3D strlen(rbname); + /* + * We maintain the last ramblock that we requested for page. Note tha= t we + * don't need locking because this function will only be called within= the + * postcopy ram fault thread. + */ + if (rb !=3D mis->last_rb) { + mis->last_rb =3D rb; + + rbname =3D qemu_ram_get_idstr(rb); + rbname_len =3D strlen(rbname); + assert(rbname_len < 256); =20 bufc[msglen++] =3D rbname_len; diff --git a/migration/migration.h b/migration/migration.h index ae497bd45a..ca8dc4c773 100644 --- a/migration/migration.h +++ b/migration/migration.h @@ -328,8 +328,8 @@ void migrate_send_rp_shut(MigrationIncomingState *mis, uint32_t value); void migrate_send_rp_pong(MigrationIncomingState *mis, uint32_t value); -int migrate_send_rp_req_pages(MigrationIncomingState *mis, const char* rbn= ame, - ram_addr_t start, size_t len); +int migrate_send_rp_req_pages(MigrationIncomingState *mis, RAMBlock *rb, + ram_addr_t start); void migrate_send_rp_recv_bitmap(MigrationIncomingState *mis, char *block_name); void migrate_send_rp_resume_ack(MigrationIncomingState *mis, uint32_t valu= e); diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c index 1bb22f2b6c..11a70441a6 100644 --- a/migration/postcopy-ram.c +++ b/migration/postcopy-ram.c @@ -684,14 +684,7 @@ int postcopy_request_shared_page(struct PostCopyFD *pc= fd, RAMBlock *rb, qemu_ram_get_idstr(rb), rb_offset); return postcopy_wake_shared(pcfd, client_addr, rb); } - if (rb !=3D mis->last_rb) { - mis->last_rb =3D rb; - migrate_send_rp_req_pages(mis, qemu_ram_get_idstr(rb), - aligned_rbo, pagesize); - } else { - /* Save some space */ - migrate_send_rp_req_pages(mis, NULL, aligned_rbo, pagesize); - } + migrate_send_rp_req_pages(mis, rb, aligned_rbo); return 0; } =20 @@ -986,20 +979,7 @@ retry: * Send the request to the source - we want to request one * of our host page sizes (which is >=3D TPS) */ - if (rb !=3D mis->last_rb) { - mis->last_rb =3D rb; - ret =3D migrate_send_rp_req_pages(mis, - qemu_ram_get_idstr(rb), - rb_offset, - qemu_ram_pagesize(rb)); - } else { - /* Save some space */ - ret =3D migrate_send_rp_req_pages(mis, - NULL, - rb_offset, - qemu_ram_pagesize(rb)); - } - + ret =3D migrate_send_rp_req_pages(mis, rb, rb_offset); if (ret) { /* May be network failure, try to wait for recovery */ if (ret =3D=3D -EIO && postcopy_pause_fault_thread(mis)) { --=20 2.26.2