From 3b57c876e1eaca34fb5bd9067553de945013d4be Mon Sep 17 00:00:00 2001 From: Juan Quintela Date: Wed, 18 May 2022 02:52:24 -0300 Subject: [PATCH 16/37] multifd: Use normal pages array on the send side MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit RH-Author: Leonardo Brás RH-MergeRequest: 191: MSG_ZEROCOPY + Multifd @ rhel8.7 RH-Commit: [16/26] 1c48806474daf48fe93920ac361311af95c6a6f3 RH-Bugzilla: 2072049 RH-Acked-by: Peter Xu RH-Acked-by: Daniel P. Berrangé RH-Acked-by: Dr. David Alan Gilbert We are only sending normal pages through multifd channels. Later on this series, we are going to also send zero pages. We are going to detect if a page is zero or non zero in the multifd channel thread, not on the main thread. So we receive an array of pages page->offset[N] And we will end with: p->normal[N - zero_pages] p->zero[zero_pages]. In this patch, we just copy all the pages in offset to normal. for (i = 0; i < pages->num; i++) { p->narmal[p->normal_num] = pages->offset[i]; p->normal_num++: } Later in the series this becomes: for (i = 0; i < pages->num; i++) { if (buffer_is_zero(page->offset[i])) { p->zerol[p->zero_num] = pages->offset[i]; p->zero_num++: } else { p->narmal[p->normal_num] = pages->offset[i]; p->normal_num++: } } Signed-off-by: Juan Quintela Reviewed-by: Dr. David Alan Gilbert --- Improving comment (dave) Renaming num_normal_pages to total_normal_pages (peter) (cherry picked from commit 815956f03902980c771da64b17f7f791c1cb57b0) Signed-off-by: Leonardo Bras --- migration/multifd-zlib.c | 6 +++--- migration/multifd-zstd.c | 6 +++--- migration/multifd.c | 30 +++++++++++++++++++----------- migration/multifd.h | 8 ++++++-- migration/trace-events | 4 ++-- 5 files changed, 33 insertions(+), 21 deletions(-) diff --git a/migration/multifd-zlib.c b/migration/multifd-zlib.c index 8ed29b9633..8508f26adf 100644 --- a/migration/multifd-zlib.c +++ b/migration/multifd-zlib.c @@ -108,16 +108,16 @@ static int zlib_send_prepare(MultiFDSendParams *p, Error **errp) int ret; uint32_t i; - for (i = 0; i < p->pages->num; i++) { + for (i = 0; i < p->normal_num; i++) { uint32_t available = z->zbuff_len - out_size; int flush = Z_NO_FLUSH; - if (i == p->pages->num - 1) { + if (i == p->normal_num - 1) { flush = Z_SYNC_FLUSH; } zs->avail_in = page_size; - zs->next_in = p->pages->block->host + p->pages->offset[i]; + zs->next_in = p->pages->block->host + p->normal[i]; zs->avail_out = available; zs->next_out = z->zbuff + out_size; diff --git a/migration/multifd-zstd.c b/migration/multifd-zstd.c index 25e1f517b5..693af3a140 100644 --- a/migration/multifd-zstd.c +++ b/migration/multifd-zstd.c @@ -123,13 +123,13 @@ static int zstd_send_prepare(MultiFDSendParams *p, Error **errp) z->out.size = z->zbuff_len; z->out.pos = 0; - for (i = 0; i < p->pages->num; i++) { + for (i = 0; i < p->normal_num; i++) { ZSTD_EndDirective flush = ZSTD_e_continue; - if (i == p->pages->num - 1) { + if (i == p->normal_num - 1) { flush = ZSTD_e_flush; } - z->in.src = p->pages->block->host + p->pages->offset[i]; + z->in.src = p->pages->block->host + p->normal[i]; z->in.size = page_size; z->in.pos = 0; diff --git a/migration/multifd.c b/migration/multifd.c index d0f86542b1..3725226400 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -89,13 +89,13 @@ static int nocomp_send_prepare(MultiFDSendParams *p, Error **errp) MultiFDPages_t *pages = p->pages; size_t page_size = qemu_target_page_size(); - for (int i = 0; i < p->pages->num; i++) { - p->iov[p->iovs_num].iov_base = pages->block->host + pages->offset[i]; + for (int i = 0; i < p->normal_num; i++) { + p->iov[p->iovs_num].iov_base = pages->block->host + p->normal[i]; p->iov[p->iovs_num].iov_len = page_size; p->iovs_num++; } - p->next_packet_size = p->pages->num * page_size; + p->next_packet_size = p->normal_num * page_size; p->flags |= MULTIFD_FLAG_NOCOMP; return 0; } @@ -262,7 +262,7 @@ static void multifd_send_fill_packet(MultiFDSendParams *p) packet->flags = cpu_to_be32(p->flags); packet->pages_alloc = cpu_to_be32(p->pages->allocated); - packet->pages_used = cpu_to_be32(p->pages->num); + packet->pages_used = cpu_to_be32(p->normal_num); packet->next_packet_size = cpu_to_be32(p->next_packet_size); packet->packet_num = cpu_to_be64(p->packet_num); @@ -270,9 +270,9 @@ static void multifd_send_fill_packet(MultiFDSendParams *p) strncpy(packet->ramblock, p->pages->block->idstr, 256); } - for (i = 0; i < p->pages->num; i++) { + for (i = 0; i < p->normal_num; i++) { /* there are architectures where ram_addr_t is 32 bit */ - uint64_t temp = p->pages->offset[i]; + uint64_t temp = p->normal[i]; packet->offset[i] = cpu_to_be64(temp); } @@ -556,6 +556,8 @@ void multifd_save_cleanup(void) p->packet = NULL; g_free(p->iov); p->iov = NULL; + g_free(p->normal); + p->normal = NULL; multifd_send_state->ops->send_cleanup(p, &local_err); if (local_err) { migrate_set_error(migrate_get_current(), local_err); @@ -640,12 +642,17 @@ static void *multifd_send_thread(void *opaque) qemu_mutex_lock(&p->mutex); if (p->pending_job) { - uint32_t used = p->pages->num; uint64_t packet_num = p->packet_num; uint32_t flags = p->flags; p->iovs_num = 1; + p->normal_num = 0; + + for (int i = 0; i < p->pages->num; i++) { + p->normal[p->normal_num] = p->pages->offset[i]; + p->normal_num++; + } - if (used) { + if (p->normal_num) { ret = multifd_send_state->ops->send_prepare(p, &local_err); if (ret != 0) { qemu_mutex_unlock(&p->mutex); @@ -655,12 +662,12 @@ static void *multifd_send_thread(void *opaque) multifd_send_fill_packet(p); p->flags = 0; p->num_packets++; - p->num_pages += used; + p->total_normal_pages += p->normal_num; p->pages->num = 0; p->pages->block = NULL; qemu_mutex_unlock(&p->mutex); - trace_multifd_send(p->id, packet_num, used, flags, + trace_multifd_send(p->id, packet_num, p->normal_num, flags, p->next_packet_size); p->iov[0].iov_len = p->packet_len; @@ -710,7 +717,7 @@ out: qemu_mutex_unlock(&p->mutex); rcu_unregister_thread(); - trace_multifd_send_thread_end(p->id, p->num_packets, p->num_pages); + trace_multifd_send_thread_end(p->id, p->num_packets, p->total_normal_pages); return NULL; } @@ -910,6 +917,7 @@ int multifd_save_setup(Error **errp) p->tls_hostname = g_strdup(s->hostname); /* We need one extra place for the packet header */ p->iov = g_new0(struct iovec, page_count + 1); + p->normal = g_new0(ram_addr_t, page_count); socket_send_channel_create(multifd_new_send_channel_async, p); } diff --git a/migration/multifd.h b/migration/multifd.h index 7496f951a7..7823199dbe 100644 --- a/migration/multifd.h +++ b/migration/multifd.h @@ -104,14 +104,18 @@ typedef struct { /* thread local variables */ /* packets sent through this channel */ uint64_t num_packets; - /* pages sent through this channel */ - uint64_t num_pages; + /* non zero pages sent through this channel */ + uint64_t total_normal_pages; /* syncs main thread and channels */ QemuSemaphore sem_sync; /* buffers to send */ struct iovec *iov; /* number of iovs used */ uint32_t iovs_num; + /* Pages that are not zero */ + ram_addr_t *normal; + /* num of non zero pages */ + uint32_t normal_num; /* used for compression methods */ void *data; } MultiFDSendParams; diff --git a/migration/trace-events b/migration/trace-events index 5172cb3b3d..171a83a55d 100644 --- a/migration/trace-events +++ b/migration/trace-events @@ -124,13 +124,13 @@ multifd_recv_sync_main_wait(uint8_t id) "channel %u" multifd_recv_terminate_threads(bool error) "error %d" multifd_recv_thread_end(uint8_t id, uint64_t packets, uint64_t pages) "channel %u packets %" PRIu64 " pages %" PRIu64 multifd_recv_thread_start(uint8_t id) "%u" -multifd_send(uint8_t id, uint64_t packet_num, uint32_t used, uint32_t flags, uint32_t next_packet_size) "channel %u packet_num %" PRIu64 " pages %u flags 0x%x next packet size %u" +multifd_send(uint8_t id, uint64_t packet_num, uint32_t normal, uint32_t flags, uint32_t next_packet_size) "channel %u packet_num %" PRIu64 " normal pages %u flags 0x%x next packet size %u" multifd_send_error(uint8_t id) "channel %u" multifd_send_sync_main(long packet_num) "packet num %ld" multifd_send_sync_main_signal(uint8_t id) "channel %u" multifd_send_sync_main_wait(uint8_t id) "channel %u" multifd_send_terminate_threads(bool error) "error %d" -multifd_send_thread_end(uint8_t id, uint64_t packets, uint64_t pages) "channel %u packets %" PRIu64 " pages %" PRIu64 +multifd_send_thread_end(uint8_t id, uint64_t packets, uint64_t normal_pages) "channel %u packets %" PRIu64 " normal pages %" PRIu64 multifd_send_thread_start(uint8_t id) "%u" multifd_tls_outgoing_handshake_start(void *ioc, void *tioc, const char *hostname) "ioc=%p tioc=%p hostname=%s" multifd_tls_outgoing_handshake_error(void *ioc, const char *err) "ioc=%p err=%s" -- 2.35.3