From 98f1138902195bd9ab8a753d0ee2cf2a0a88b6e8 Mon Sep 17 00:00:00 2001 From: Liang Li Date: Mon, 23 Mar 2015 16:32:24 +0800 Subject: [PATCH] migration: Make compression co-work with xbzrle Now, multiple thread compression can co-work with xbzrle. when xbzrle is on, multiple thread compression will only work at the first round of RAM data sync. Signed-off-by: Liang Li Signed-off-by: Yang Zhang Reviewed-by: Dr.David Alan Gilbert Signed-off-by: Juan Quintela --- arch_init.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/arch_init.c b/arch_init.c index db1759117e..129c710c3c 100644 --- a/arch_init.c +++ b/arch_init.c @@ -349,6 +349,8 @@ static QemuMutex *comp_done_lock; static QemuCond *comp_done_cond; /* The empty QEMUFileOps will be used by file in CompressParam */ static const QEMUFileOps empty_ops = { }; + +static bool compression_switch; static bool quit_comp_thread; static bool quit_decomp_thread; static DecompressParam *decomp_param; @@ -435,6 +437,7 @@ void migrate_compress_threads_create(void) return; } quit_comp_thread = false; + compression_switch = true; thread_count = migrate_compress_threads(); compress_threads = g_new0(QemuThread, thread_count); comp_param = g_new0(CompressParam, thread_count); @@ -1061,9 +1064,16 @@ static int ram_find_and_save_block(QEMUFile *f, bool last_stage, block = QLIST_FIRST_RCU(&ram_list.blocks); complete_round = true; ram_bulk_stage = false; + if (migrate_use_xbzrle()) { + /* If xbzrle is on, stop using the data compression at this + * point. In theory, xbzrle can do better than compression. + */ + flush_compressed_data(f); + compression_switch = false; + } } } else { - if (migrate_use_compression()) { + if (compression_switch && migrate_use_compression()) { pages = ram_save_compressed_page(f, block, offset, last_stage, bytes_transferred); } else { -- 2.39.2