From patchwork Mon Apr 20 03:06:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Wang, Wei W" X-Patchwork-Id: 11498051 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E3ACE15AB for ; Mon, 20 Apr 2020 04:04:10 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 912E420735 for ; Mon, 20 Apr 2020 04:04:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 912E420735 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:56932 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jQNfC-0008Ur-IN for patchwork-qemu-devel@patchwork.kernel.org; Mon, 20 Apr 2020 00:04:07 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:36582 helo=eggs1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jQNcF-00073d-O4 for qemu-devel@nongnu.org; Mon, 20 Apr 2020 00:01:04 -0400 Received: from Debian-exim by eggs1p.gnu.org with spam-scanned (Exim 4.90_1) (envelope-from ) id 1jQNcD-0000iw-JU for qemu-devel@nongnu.org; Mon, 20 Apr 2020 00:01:03 -0400 Received: from mga09.intel.com ([134.134.136.24]:39951) by eggs1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jQNcC-0000eQ-VG for qemu-devel@nongnu.org; Mon, 20 Apr 2020 00:01:01 -0400 IronPort-SDR: mXzgoDXDtW9xq4vkXLDsG3qctruusVb9dUv6ExsSVUXUrSywuN3O20aTe2R1ov7pSZSZpQJuW+ b6hWtVjfqz5A== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Apr 2020 21:00:58 -0700 IronPort-SDR: vUUSSr6/GgaPeoFk5JOlzPnL4sISx0Lca0UhfliYmvcNCuweLYIEo5ec+49Gr4bAtH6uLZj65q AJ5uba2PqdUQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.72,405,1580803200"; d="scan'208";a="333790715" Received: from unknown (HELO devel-ww.sh.intel.com) ([10.239.48.118]) by orsmga001.jf.intel.com with ESMTP; 19 Apr 2020 21:00:56 -0700 From: Wei Wang To: qemu-devel@nongnu.org, quintela@redhat.com, dgilbert@redhat.com, peterx@redhat.com Subject: [PATCH v1 2/2] migration/xbzrle: add encoding rate Date: Mon, 20 Apr 2020 11:06:43 +0800 Message-Id: <1587352003-3312-3-git-send-email-wei.w.wang@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1587352003-3312-1-git-send-email-wei.w.wang@intel.com> References: <1587352003-3312-1-git-send-email-wei.w.wang@intel.com> Received-SPF: pass client-ip=134.134.136.24; envelope-from=wei.w.wang@intel.com; helo=mga09.intel.com X-detected-operating-system: by eggs1p.gnu.org: First seen = 2020/04/20 00:00:54 X-ACL-Warn: Detected OS = FreeBSD 9.x or newer [fuzzy] X-Received-From: 134.134.136.24 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: gloryxiao@tencent.com, kevin.tian@intel.com, wei.w.wang@intel.com, yi.y.sun@intel.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" Users may need to check the xbzrle encoding rate to know if the guest memory is xbzrle encoding-friendly, and dynamically turn off the encoding if the encoding rate is low. Signed-off-by: Yi Sun Signed-off-by: Wei Wang --- migration/migration.c | 1 + migration/ram.c | 31 +++++++++++++++++++++++++++++-- monitor/hmp-cmds.c | 2 ++ qapi/migration.json | 5 ++++- slirp | 2 +- 5 files changed, 37 insertions(+), 4 deletions(-) diff --git a/migration/migration.c b/migration/migration.c index 8e7ee0d76b..84a556a4ac 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -930,6 +930,7 @@ static void populate_ram_info(MigrationInfo *info, MigrationState *s) info->xbzrle_cache->pages = xbzrle_counters.pages; info->xbzrle_cache->cache_miss = xbzrle_counters.cache_miss; info->xbzrle_cache->cache_miss_rate = xbzrle_counters.cache_miss_rate; + info->xbzrle_cache->encoding_rate = xbzrle_counters.encoding_rate; info->xbzrle_cache->overflow = xbzrle_counters.overflow; } diff --git a/migration/ram.c b/migration/ram.c index bca5878f25..c87c38ec80 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -327,6 +327,10 @@ struct RAMState { uint64_t num_dirty_pages_period; /* xbzrle misses since the beginning of the period */ uint64_t xbzrle_cache_miss_prev; + /* Amount of xbzrle pages since the beginning of the period */ + uint64_t xbzrle_pages_prev; + /* Amount of encoded bytes since the beginning of the period */ + uint64_t encoded_size_prev; /* compression statistics since the beginning of the period */ /* amount of count that no free thread to compress data */ @@ -696,6 +700,18 @@ static int save_xbzrle_page(RAMState *rs, uint8_t **current_data, return -1; } + /* + * Reaching here means the page has hit the xbzrle cache, no matter what + * encoding result it is (normal encoding, overflow or skipping the page), + * count the page as encoded. This is used to caculate the encoding rate. + * + * Example: 2 pages (8KB) being encoded, first page encoding generates 2KB, + * 2nd page turns out to be skipped (i.e. no new bytes written to the + * page), the overall encoding rate will be 8KB / 2KB = 4, which has the + * skipped page included. In this way, the encoding rate can tell if the + * guest page is good for xbzrle encoding. + */ + xbzrle_counters.pages++; prev_cached_page = get_cached_data(XBZRLE.cache, current_addr); /* save current buffer into memory */ @@ -736,7 +752,6 @@ static int save_xbzrle_page(RAMState *rs, uint8_t **current_data, qemu_put_be16(rs->f, encoded_size); qemu_put_buffer(rs->f, XBZRLE.encoded_buf, encoded_size); bytes_xbzrle += encoded_size + 1 + 2; - xbzrle_counters.pages++; xbzrle_counters.encoded_size += encoded_size; ram_counters.transferred += bytes_xbzrle; @@ -859,7 +874,7 @@ uint64_t ram_get_total_transferred_pages(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; + double compressed_size, encoded_size, unencoded_size; /* calculate period counters */ ram_counters.dirty_pages_rate = rs->num_dirty_pages_period * 1000 @@ -873,6 +888,18 @@ static void migration_update_rates(RAMState *rs, int64_t end_time) xbzrle_counters.cache_miss_rate = (double)(xbzrle_counters.cache_miss - rs->xbzrle_cache_miss_prev) / page_count; rs->xbzrle_cache_miss_prev = xbzrle_counters.cache_miss; + unencoded_size = (xbzrle_counters.pages - rs->xbzrle_pages_prev) * + TARGET_PAGE_SIZE; + encoded_size = xbzrle_counters.encoded_size - rs->encoded_size_prev; + if (xbzrle_counters.pages == rs->xbzrle_pages_prev) { + xbzrle_counters.encoding_rate = 0; + } else if (!encoded_size) { + xbzrle_counters.encoding_rate = UINT64_MAX; + } else { + xbzrle_counters.encoding_rate = unencoded_size / encoded_size; + } + rs->xbzrle_pages_prev = xbzrle_counters.pages; + rs->encoded_size_prev = xbzrle_counters.encoded_size; } if (migrate_use_compression()) { diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c index 6d3b35ca64..07f41e582f 100644 --- a/monitor/hmp-cmds.c +++ b/monitor/hmp-cmds.c @@ -303,6 +303,8 @@ void hmp_info_migrate(Monitor *mon, const QDict *qdict) info->xbzrle_cache->cache_miss); monitor_printf(mon, "xbzrle cache miss rate: %0.2f\n", info->xbzrle_cache->cache_miss_rate); + monitor_printf(mon, "xbzrle encoding rate: %0.2f\n", + info->xbzrle_cache->encoding_rate); monitor_printf(mon, "xbzrle overflow: %" PRIu64 "\n", info->xbzrle_cache->overflow); } diff --git a/qapi/migration.json b/qapi/migration.json index bf195ff6ac..ee4513c565 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -70,6 +70,8 @@ # # @cache-miss-rate: rate of cache miss (since 2.1) # +# @encoding-rate: rate of cache miss +# # @overflow: number of overflows # # Since: 1.2 @@ -77,7 +79,7 @@ { 'struct': 'XBZRLECacheStats', 'data': {'cache-size': 'int', 'encoded_size': 'int', 'pages': 'int', 'cache-miss': 'int', 'cache-miss-rate': 'number', - 'overflow': 'int' } } + 'encoding-rate': 'number', 'overflow': 'int' } } ## # @CompressionStats: @@ -337,6 +339,7 @@ # "pages":2444343, # "cache-miss":2244, # "cache-miss-rate":0.123, +# "encoding-rate":80.1, # "overflow":34434 # } # } diff --git a/slirp b/slirp index 55ab21c9a3..126c04acba 160000 --- a/slirp +++ b/slirp @@ -1 +1 @@ -Subproject commit 55ab21c9a36852915b81f1b41ebaf3b6509dd8ba +Subproject commit 126c04acbabd7ad32c2b018fe10dfac2a3bc1210