From f1c72795af573b24a7da5eb52375c9aba8a37972 Mon Sep 17 00:00:00 2001 From: Peter Lieven Date: Tue, 26 Mar 2013 10:58:37 +0100 Subject: [PATCH] migration: do not sent zero pages in bulk stage during bulk stage of ram migration if a page is a zero page do not send it at all. the memory at the destination reads as zero anyway. even if there is an madvise with QEMU_MADV_DONTNEED at the target upon receipt of a zero page I have observed that the target starts swapping if the memory is overcommitted. it seems that the pages are dropped asynchronously. this patch also updates QMP to return the number of skipped pages in MigrationStats. Signed-off-by: Peter Lieven Reviewed-by: Eric Blake Signed-off-by: Juan Quintela --- arch_init.c | 24 ++++++++++++++++++++---- hmp.c | 2 ++ include/migration/migration.h | 2 ++ migration.c | 3 ++- qapi-schema.json | 8 +++++--- qmp-commands.hx | 1 + 6 files changed, 32 insertions(+), 8 deletions(-) diff --git a/arch_init.c b/arch_init.c index 1291bd2b3..3a0d02eaf 100644 --- a/arch_init.c +++ b/arch_init.c @@ -183,6 +183,7 @@ int64_t xbzrle_cache_resize(int64_t new_size) /* accounting for migration statistics */ typedef struct AccountingInfo { uint64_t dup_pages; + uint64_t skipped_pages; uint64_t norm_pages; uint64_t iterations; uint64_t xbzrle_bytes; @@ -208,6 +209,16 @@ uint64_t dup_mig_pages_transferred(void) return acct_info.dup_pages; } +uint64_t skipped_mig_bytes_transferred(void) +{ + return acct_info.skipped_pages * TARGET_PAGE_SIZE; +} + +uint64_t skipped_mig_pages_transferred(void) +{ + return acct_info.skipped_pages; +} + uint64_t norm_mig_bytes_transferred(void) { return acct_info.norm_pages * TARGET_PAGE_SIZE; @@ -440,10 +451,15 @@ static int ram_save_block(QEMUFile *f, bool last_stage) bytes_sent = -1; if (is_zero_page(p)) { acct_info.dup_pages++; - bytes_sent = save_block_hdr(f, block, offset, cont, - RAM_SAVE_FLAG_COMPRESS); - qemu_put_byte(f, 0); - bytes_sent++; + if (!ram_bulk_stage) { + bytes_sent = save_block_hdr(f, block, offset, cont, + RAM_SAVE_FLAG_COMPRESS); + qemu_put_byte(f, 0); + bytes_sent++; + } else { + acct_info.skipped_pages++; + bytes_sent = 0; + } } else if (migrate_use_xbzrle()) { current_addr = block->offset + offset; bytes_sent = save_xbzrle_page(f, p, current_addr, block, diff --git a/hmp.c b/hmp.c index b0a861cfb..e3e833edf 100644 --- a/hmp.c +++ b/hmp.c @@ -173,6 +173,8 @@ void hmp_info_migrate(Monitor *mon, const QDict *qdict) info->ram->total >> 10); monitor_printf(mon, "duplicate: %" PRIu64 " pages\n", info->ram->duplicate); + monitor_printf(mon, "skipped: %" PRIu64 " pages\n", + info->ram->skipped); monitor_printf(mon, "normal: %" PRIu64 " pages\n", info->ram->normal); monitor_printf(mon, "normal bytes: %" PRIu64 " kbytes\n", diff --git a/include/migration/migration.h b/include/migration/migration.h index bb617fdac..e2acec64c 100644 --- a/include/migration/migration.h +++ b/include/migration/migration.h @@ -96,6 +96,8 @@ extern SaveVMHandlers savevm_ram_handlers; uint64_t dup_mig_bytes_transferred(void); uint64_t dup_mig_pages_transferred(void); +uint64_t skipped_mig_bytes_transferred(void); +uint64_t skipped_mig_pages_transferred(void); uint64_t norm_mig_bytes_transferred(void); uint64_t norm_mig_pages_transferred(void); uint64_t xbzrle_mig_bytes_transferred(void); diff --git a/migration.c b/migration.c index 185d11260..7fb214739 100644 --- a/migration.c +++ b/migration.c @@ -197,11 +197,11 @@ MigrationInfo *qmp_query_migrate(Error **errp) info->ram->remaining = ram_bytes_remaining(); info->ram->total = ram_bytes_total(); info->ram->duplicate = dup_mig_pages_transferred(); + info->ram->skipped = skipped_mig_pages_transferred(); info->ram->normal = norm_mig_pages_transferred(); info->ram->normal_bytes = norm_mig_bytes_transferred(); info->ram->dirty_pages_rate = s->dirty_pages_rate; - if (blk_mig_active()) { info->has_disk = true; info->disk = g_malloc0(sizeof(*info->disk)); @@ -227,6 +227,7 @@ MigrationInfo *qmp_query_migrate(Error **errp) info->ram->remaining = 0; info->ram->total = ram_bytes_total(); info->ram->duplicate = dup_mig_pages_transferred(); + info->ram->skipped = skipped_mig_pages_transferred(); info->ram->normal = norm_mig_pages_transferred(); info->ram->normal_bytes = norm_mig_bytes_transferred(); break; diff --git a/qapi-schema.json b/qapi-schema.json index 088f4e150..6c4966be4 100644 --- a/qapi-schema.json +++ b/qapi-schema.json @@ -496,7 +496,9 @@ # # @total: total amount of bytes involved in the migration process # -# @duplicate: number of duplicate pages (since 1.2) +# @duplicate: number of duplicate (zero) pages (since 1.2) +# +# @skipped: number of skipped zero pages (since 1.5) # # @normal : number of normal pages (since 1.2) # @@ -509,8 +511,8 @@ ## { 'type': 'MigrationStats', 'data': {'transferred': 'int', 'remaining': 'int', 'total': 'int' , - 'duplicate': 'int', 'normal': 'int', 'normal-bytes': 'int', - 'dirty-pages-rate' : 'int' } } + 'duplicate': 'int', 'skipped': 'int', 'normal': 'int', + 'normal-bytes': 'int', 'dirty-pages-rate' : 'int' } } ## # @XBZRLECacheStats diff --git a/qmp-commands.hx b/qmp-commands.hx index 5e847b18d..fdc40486f 100644 --- a/qmp-commands.hx +++ b/qmp-commands.hx @@ -2445,6 +2445,7 @@ The main json-object contains the following: - "duplicate": number of pages filled entirely with the same byte (json-int) These are sent over the wire much more efficiently. + - "skipped": number of skipped zero pages (json-int) - "normal" : number of whole pages transfered. I.e. they were not sent as duplicate or xbzrle pages (json-int) - "normal-bytes" : number of bytes transferred in whole -- 2.39.2