From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47370) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fI6e7-0006dK-9B for qemu-devel@nongnu.org; Mon, 14 May 2018 02:07:46 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fI46T-00008p-S4 for qemu-devel@nongnu.org; Sun, 13 May 2018 23:24:53 -0400 Received: from mail-pl0-x243.google.com ([2607:f8b0:400e:c01::243]:36132) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1fI46T-00007R-MY for qemu-devel@nongnu.org; Sun, 13 May 2018 23:24:49 -0400 Received: by mail-pl0-x243.google.com with SMTP id v24-v6so6521943plo.3 for ; Sun, 13 May 2018 20:24:49 -0700 (PDT) From: Zhang Chen Date: Mon, 14 May 2018 11:23:39 +0800 Message-Id: <1526268228-27951-9-git-send-email-zhangckid@gmail.com> In-Reply-To: <1526268228-27951-1-git-send-email-zhangckid@gmail.com> References: <1526268228-27951-1-git-send-email-zhangckid@gmail.com> Subject: [Qemu-devel] [PATCH V7 08/17] ram/COLO: Record the dirty pages that SVM received List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Eric Blake , Markus Armbruster , Paolo Bonzini , Zhang Chen , "Dr . David Alan Gilbert" , Jason Wang , zhanghailiang We record the address of the dirty pages that received, it will help flushing pages that cached into SVM. Here, it is a trick, we record dirty pages by re-using migration dirty bitmap. In the later patch, we will start the dirty log for SVM, just like migration, in this way, we can record both the dirty pages caused by PVM and SVM, we only flush those dirty pages from RAM cache while do checkpoint. Signed-off-by: zhanghailiang Reviewed-by: Dr. David Alan Gilbert --- migration/ram.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/migration/ram.c b/migration/ram.c index 7ca845f..e35dfee 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -2531,6 +2531,15 @@ static inline void *colo_cache_from_block_offset(RAMBlock *block, __func__, block->idstr); return NULL; } + + /* + * During colo checkpoint, we need bitmap of these migrated pages. + * It help us to decide which pages in ram cache should be flushed + * into VM's RAM later. + */ + if (!test_and_set_bit(offset >> TARGET_PAGE_BITS, block->bmap)) { + ram_state->migration_dirty_pages++; + } return block->colo_cache + offset; } @@ -2760,6 +2769,24 @@ int colo_init_ram_cache(void) } } rcu_read_unlock(); + /* + * Record the dirty pages that sent by PVM, we use this dirty bitmap together + * with to decide which page in cache should be flushed into SVM's RAM. Here + * we use the same name 'ram_bitmap' as for migration. + */ + if (ram_bytes_total()) { + RAMBlock *block; + + QLIST_FOREACH_RCU(block, &ram_list.blocks, next) { + unsigned long pages = block->max_length >> TARGET_PAGE_BITS; + + block->bmap = bitmap_new(pages); + bitmap_set(block->bmap, 0, pages); + } + } + ram_state = g_new0(RAMState, 1); + ram_state->migration_dirty_pages = 0; + return 0; out_locked: @@ -2779,6 +2806,10 @@ void colo_release_ram_cache(void) { RAMBlock *block; + QLIST_FOREACH_RCU(block, &ram_list.blocks, next) { + g_free(block->bmap); + block->bmap = NULL; + } rcu_read_lock(); QLIST_FOREACH_RCU(block, &ram_list.blocks, next) { if (block->colo_cache) { @@ -2787,6 +2818,8 @@ void colo_release_ram_cache(void) } } rcu_read_unlock(); + g_free(ram_state); + ram_state = NULL; } /** -- 2.7.4