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[104.199.227.109]) by smtp.gmail.com with ESMTPSA id p6-v6sm17183532pfg.157.2018.05.13.20.24.43 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Sun, 13 May 2018 20:24:47 -0700 (PDT) From: Zhang Chen To: qemu-devel@nongnu.org Date: Mon, 14 May 2018 11:23:39 +0800 Message-Id: <1526268228-27951-9-git-send-email-zhangckid@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1526268228-27951-1-git-send-email-zhangckid@gmail.com> References: <1526268228-27951-1-git-send-email-zhangckid@gmail.com> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:400e:c01::243 Subject: [Qemu-devel] [PATCH V7 08/17] ram/COLO: Record the dirty pages that SVM received 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: zhanghailiang , Jason Wang , Markus Armbruster , "Dr . David Alan Gilbert" , Zhang Chen , Paolo Bonzini Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" 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; } /**