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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=205.220.177.32; envelope-from=elena.ufimtseva@oracle.com; helo=mx0b-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 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_LOW=-0.7, RCVD_IN_MSPIKE_H5=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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @oracle.com) X-ZM-MESSAGEID: 1697049907344100001 Content-Type: text/plain; charset="utf-8" In migration rate limiting atomic operations are used to read the rate limit variables and transferred bytes and they are expensive. Check first if rate_limit_max is equal to RATE_LIMIT_DISABLED and return false immediately if so. Note that with this patch we will also will stop flushing by not calling qemu_fflush() from migration_transferred_bytes() if the migration rate is not exceeded. This should be fine since migration thread calls in the loop migration_update_counters from migration_rate_limit() that calls the migration_transferred_bytes() and flushes there. Signed-off-by: Elena Ufimtseva Reviewed-by: Fabiano Rosas Reviewed-by: Peter Xu Reviewed-by: Juan Quintela --- migration/migration-stats.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/migration/migration-stats.c b/migration/migration-stats.c index 84e11e6dd8..4cc989d975 100644 --- a/migration/migration-stats.c +++ b/migration/migration-stats.c @@ -24,14 +24,15 @@ bool migration_rate_exceeded(QEMUFile *f) return true; } =20 + uint64_t rate_limit_max =3D migration_rate_get(); + if (rate_limit_max =3D=3D RATE_LIMIT_DISABLED) { + return false; + } + uint64_t rate_limit_start =3D stat64_get(&mig_stats.rate_limit_start); uint64_t rate_limit_current =3D migration_transferred_bytes(f); uint64_t rate_limit_used =3D rate_limit_current - rate_limit_start; - uint64_t rate_limit_max =3D stat64_get(&mig_stats.rate_limit_max); =20 - if (rate_limit_max =3D=3D RATE_LIMIT_DISABLED) { - return false; - } if (rate_limit_max > 0 && rate_limit_used > rate_limit_max) { return true; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=205.220.177.32; envelope-from=elena.ufimtseva@oracle.com; helo=mx0b-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 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_LOW=-0.7, RCVD_IN_MSPIKE_H5=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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @oracle.com) X-ZM-MESSAGEID: 1697049931254100001 Content-Type: text/plain; charset="utf-8" next_packet_size name is a bit misleading, so add more comments where its defined. We send data in two chunks in multifd thread: - send the packet with normal (non-zero) guest pages offsets that are dirty. This uses the packet_len and we increment number of packets for this thread that are sent; - send the normal (non-zero) guest dirty pages themselves in iovs. The total size of the data pointed by all iovs for this chunk is next_packet_size. We do not increment the packet_num for this thread when sending actual pages; When compression is enabled, next_packet_size is used to indicate the size of the compressed buffer on source and destination. Will be it helpful to rename it as data_size or dirty_data_size? Signed-off-by: Elena Ufimtseva --- migration/multifd.h | 35 ++++++++++++++++++++++++++++++----- 1 file changed, 30 insertions(+), 5 deletions(-) diff --git a/migration/multifd.h b/migration/multifd.h index a835643b48..37da9b68c2 100644 --- a/migration/multifd.h +++ b/migration/multifd.h @@ -45,7 +45,13 @@ typedef struct { uint32_t pages_alloc; /* non zero pages */ uint32_t normal_pages; - /* size of the next packet that contains pages */ + /* + * amount of data to be sent to the destination + * that is calculated as + * - number of the normal guest dirty pages * page_size in non + * compression case; + * - equals of the compressed data size to be received; + */ uint32_t next_packet_size; uint64_t packet_num; uint64_t unused[4]; /* Reserved for future use */ @@ -79,11 +85,18 @@ typedef struct { QIOChannel *c; /* is the yank function registered */ bool registered_yank; - /* packet allocated len */ + /* + * allocated length of a packet to be transferred. + * It has a size of MultiFDPacket struct plus + * the size of the array of guest page offsets (page_count * page_size= ). + */ uint32_t packet_len; /* guest page size */ uint32_t page_size; - /* number of pages in a full packet */ + /* + * maximum number of dirty pages in a full packet calculated as + * MULTIFD_PACKET_SIZE / qemu_target_page_size() + */ uint32_t page_count; /* multifd flags for sending ram */ int write_flags; @@ -116,7 +129,13 @@ typedef struct { =20 /* pointer to the packet */ MultiFDPacket_t *packet; - /* size of the next packet that contains pages */ + /* + * amount of data to be sent to the destination + * that is calculated as + * - number of the normal guest dirty pages * page_size in non + * compression case; + * - equals of the compressed data size to be received; + */ uint32_t next_packet_size; /* packets sent through this channel */ uint64_t num_packets; @@ -171,7 +190,13 @@ typedef struct { =20 /* pointer to the packet */ MultiFDPacket_t *packet; - /* size of the next packet that contains pages */ + /* + * amount of data to be received by the destination + * that is calculated as + * - number of the normal guest dirty pages * page_size in non + * compression case; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=205.220.177.32; envelope-from=elena.ufimtseva@oracle.com; helo=mx0b-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 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_LOW=-0.7, RCVD_IN_MSPIKE_H5=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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @oracle.com) X-ZM-MESSAGEID: 1697049917186100007 Content-Type: text/plain; charset="utf-8" Previous commit cbec7eb76879d419e7dbf531ee2506ec0722e825 "migration/multifd: Compute transferred bytes correctly" removed accounting for packet_len in non-rdma case, but the next_packet_size only accounts for pages, not for the header packet (normal_pages * PAGE_SIZE) that is being sent as iov[0]. The packet_len part should be added to account for the size of MultiFDPacket and the array of the offsets. Signed-off-by: Elena Ufimtseva Reviewed-by: Fabiano Rosas Reviewed-by: Juan Quintela --- migration/multifd.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/migration/multifd.c b/migration/multifd.c index 0f6b203877..e6e0013c16 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -714,8 +714,6 @@ static void *multifd_send_thread(void *opaque) if (ret !=3D 0) { break; } - stat64_add(&mig_stats.multifd_bytes, p->packet_len); - stat64_add(&mig_stats.transferred, p->packet_len); } else { /* Send header using the same writev call */ p->iov[0].iov_len =3D p->packet_len; @@ -728,8 +726,10 @@ static void *multifd_send_thread(void *opaque) break; } =20 - stat64_add(&mig_stats.multifd_bytes, p->next_packet_size); - stat64_add(&mig_stats.transferred, p->next_packet_size); + stat64_add(&mig_stats.multifd_bytes, + p->next_packet_size + p->packet_len); + stat64_add(&mig_stats.transferred, + p->next_packet_size + p->packet_len); qemu_mutex_lock(&p->mutex); p->pending_job--; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=205.220.177.32; envelope-from=elena.ufimtseva@oracle.com; helo=mx0b-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 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_LOW=-0.7, RCVD_IN_MSPIKE_H5=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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @oracle.com) X-ZM-MESSAGEID: 1697049915195100001 Content-Type: text/plain; charset="utf-8" Sometimes multifd sends just sync packet with no pages (normal_num is 0). In this case the old value is being preserved and being accounted for while only packet_len is being transferred. Reset it to 0 after sending and accounting for. Signed-off-by: Elena Ufimtseva Reviewed-by: Fabiano Rosas Reviewed-by: Juan Quintela --- migration/multifd.c | 1 + 1 file changed, 1 insertion(+) diff --git a/migration/multifd.c b/migration/multifd.c index e6e0013c16..c45f5015f8 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -730,6 +730,7 @@ static void *multifd_send_thread(void *opaque) p->next_packet_size + p->packet_len); stat64_add(&mig_stats.transferred, p->next_packet_size + p->packet_len); + p->next_packet_size =3D 0; qemu_mutex_lock(&p->mutex); p->pending_job--; qemu_mutex_unlock(&p->mutex); --=20 2.34.1