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X-Received-From: 2607:f8b0:400e:c01::244 Subject: [Qemu-devel] [PATCH v4 09/10] migration: show the statistics of compression X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kvm@vger.kernel.org, Xiao Guangrong , qemu-devel@nongnu.org, peterx@redhat.com, dgilbert@redhat.com, wei.w.wang@intel.com, jiang.biao2@zte.com.cn Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Xiao Guangrong Currently, it includes: pages: amount of pages compressed and transferred to the target VM busy: amount of count that no free thread to compress data busy-rate: rate of thread busy compressed-size: amount of bytes after compression compression-rate: rate of compressed size Reviewed-by: Peter Xu Signed-off-by: Xiao Guangrong --- hmp.c | 13 +++++++++++++ migration/migration.c | 12 ++++++++++++ migration/ram.c | 41 ++++++++++++++++++++++++++++++++++++++++- migration/ram.h | 1 + qapi/migration.json | 26 +++++++++++++++++++++++++- 5 files changed, 91 insertions(+), 2 deletions(-) diff --git a/hmp.c b/hmp.c index 47d36e3ccf..e76e45e672 100644 --- a/hmp.c +++ b/hmp.c @@ -271,6 +271,19 @@ void hmp_info_migrate(Monitor *mon, const QDict *qdict) info->xbzrle_cache->overflow); } + if (info->has_compression) { + monitor_printf(mon, "compression pages: %" PRIu64 " pages\n", + info->compression->pages); + monitor_printf(mon, "compression busy: %" PRIu64 "\n", + info->compression->busy); + monitor_printf(mon, "compression busy rate: %0.2f\n", + info->compression->busy_rate); + monitor_printf(mon, "compressed size: %" PRIu64 "\n", + info->compression->compressed_size); + monitor_printf(mon, "compression rate: %0.2f\n", + info->compression->compression_rate); + } + if (info->has_cpu_throttle_percentage) { monitor_printf(mon, "cpu throttle percentage: %" PRIu64 "\n", info->cpu_throttle_percentage); diff --git a/migration/migration.c b/migration/migration.c index 2ccaadc03d..4da0a20275 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -754,6 +754,18 @@ static void populate_ram_info(MigrationInfo *info, MigrationState *s) info->xbzrle_cache->overflow = xbzrle_counters.overflow; } + if (migrate_use_compression()) { + info->has_compression = true; + info->compression = g_malloc0(sizeof(*info->compression)); + info->compression->pages = compression_counters.pages; + info->compression->busy = compression_counters.busy; + info->compression->busy_rate = compression_counters.busy_rate; + info->compression->compressed_size = + compression_counters.compressed_size; + info->compression->compression_rate = + compression_counters.compression_rate; + } + if (cpu_throttle_active()) { info->has_cpu_throttle_percentage = true; info->cpu_throttle_percentage = cpu_throttle_get_percentage(); diff --git a/migration/ram.c b/migration/ram.c index 17c3eed445..0a31767351 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -300,6 +300,15 @@ struct RAMState { uint64_t num_dirty_pages_period; /* xbzrle misses since the beginning of the period */ uint64_t xbzrle_cache_miss_prev; + + /* compression statistics since the beginning of the period */ + /* amount of count that no free thread to compress data */ + uint64_t compress_thread_busy_prev; + /* amount bytes after compression */ + uint64_t compressed_size_prev; + /* amount of compressed pages */ + uint64_t compress_pages_prev; + /* total handled target pages at the beginning of period */ uint64_t target_page_count_prev; /* total handled target pages since start */ @@ -337,6 +346,8 @@ struct PageSearchStatus { }; typedef struct PageSearchStatus PageSearchStatus; +CompressionStats compression_counters; + struct CompressParam { bool done; bool quit; @@ -1586,6 +1597,7 @@ uint64_t ram_pagesize_summary(void) static void migration_update_rates(RAMState *rs, int64_t end_time) { uint64_t page_count = rs->target_page_count - rs->target_page_count_prev; + double compressed_size; /* calculate period counters */ ram_counters.dirty_pages_rate = rs->num_dirty_pages_period * 1000 @@ -1600,15 +1612,41 @@ static void migration_update_rates(RAMState *rs, int64_t end_time) rs->xbzrle_cache_miss_prev) / page_count; rs->xbzrle_cache_miss_prev = xbzrle_counters.cache_miss; } + + if (migrate_use_compression()) { + compression_counters.busy_rate = (double)(compression_counters.busy - + rs->compress_thread_busy_prev) / page_count; + rs->compress_thread_busy_prev = compression_counters.busy; + + compressed_size = compression_counters.compressed_size - + rs->compressed_size_prev; + if (compressed_size) { + double uncompressed_size = (compression_counters.pages - + rs->compress_pages_prev) * TARGET_PAGE_SIZE; + + /* Compression-Ratio = Uncompressed-size / Compressed-size */ + compression_counters.compression_rate = + uncompressed_size / compressed_size; + + rs->compress_pages_prev = compression_counters.pages; + rs->compressed_size_prev = compression_counters.compressed_size; + } + } } static void update_compress_thread_counts(const CompressParam *param, int bytes_xmit) { + ram_counters.transferred += bytes_xmit; + if (param->zero_page) { ram_counters.duplicate++; + return; } - ram_counters.transferred += bytes_xmit; + + /* 8 means a header with RAM_SAVE_FLAG_CONTINUE. */ + compression_counters.compressed_size += bytes_xmit - 8; + compression_counters.pages++; } static void flush_compressed_data(RAMState *rs) @@ -2260,6 +2298,7 @@ static bool save_compress_page(RAMState *rs, RAMBlock *block, ram_addr_t offset) return true; } + compression_counters.busy++; return false; } diff --git a/migration/ram.h b/migration/ram.h index 457bf54b8c..a139066846 100644 --- a/migration/ram.h +++ b/migration/ram.h @@ -36,6 +36,7 @@ extern MigrationStats ram_counters; extern XBZRLECacheStats xbzrle_counters; +extern CompressionStats compression_counters; int xbzrle_cache_resize(int64_t new_size, Error **errp); uint64_t ram_bytes_remaining(void); diff --git a/qapi/migration.json b/qapi/migration.json index 940cb5cbd0..a35a3d01d5 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -75,6 +75,27 @@ 'cache-miss': 'int', 'cache-miss-rate': 'number', 'overflow': 'int' } } +## +# @CompressionStats: +# +# Detailed migration compression statistics +# +# @pages: amount of pages compressed and transferred to the target VM +# +# @busy: count of times that no free thread was available to compress data +# +# @busy-rate: rate of thread busy +# +# @compressed-size: amount of bytes after compression +# +# @compression-rate: rate of compressed size +# +# Since: 3.1 +## +{ 'struct': 'CompressionStats', + 'data': {'pages': 'int', 'busy': 'int', 'busy-rate': 'number', + 'compressed-size': 'int', 'compression-rate': 'number' } } + ## # @MigrationStatus: # @@ -172,6 +193,8 @@ # only present when the postcopy-blocktime migration capability # is enabled. (Since 3.0) # +# @compression: migration compression statistics, only returned if compression +# feature is on and status is 'active' or 'completed' (Since 3.1) # # Since: 0.14.0 ## @@ -186,7 +209,8 @@ '*cpu-throttle-percentage': 'int', '*error-desc': 'str', '*postcopy-blocktime' : 'uint32', - '*postcopy-vcpu-blocktime': ['uint32']} } + '*postcopy-vcpu-blocktime': ['uint32'], + '*compression': 'CompressionStats'} } ## # @query-migrate: