From 932d0761f1f473638a38614796bd14939cdd6215 Mon Sep 17 00:00:00 2001 From: "Dr. David Alan Gilbert" Date: Wed, 1 Aug 2018 13:55:05 +0100 Subject: [PATCH 01/21] migration: stop compressing page in migration thread RH-Author: Dr. David Alan Gilbert Message-id: <20180801135522.11658-2-dgilbert@redhat.com> Patchwork-id: 81577 O-Subject: [qemu-kvm RHEL8/virt212 PATCH 01/18] migration: stop compressing page in migration thread Bugzilla: 1594384 RH-Acked-by: Peter Xu RH-Acked-by: John Snow RH-Acked-by: Juan Quintela From: Xiao Guangrong As compression is a heavy work, do not do it in migration thread, instead, we post it out as a normal page Reviewed-by: Wei Wang Reviewed-by: Peter Xu Reviewed-by: Dr. David Alan Gilbert Signed-off-by: Xiao Guangrong Message-Id: <20180330075128.26919-2-xiaoguangrong@tencent.com> Signed-off-by: Dr. David Alan Gilbert (cherry picked from commit 263a289ae61c8344a417a95b0142650fdff3af56) Signed-off-by: Danilo C. L. de Paula --- migration/ram.c | 32 ++++++++++++++++---------------- 1 file changed, 16 insertions(+), 16 deletions(-) diff --git a/migration/ram.c b/migration/ram.c index 00c06b5..f27038a 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -1138,7 +1138,7 @@ static int ram_save_compressed_page(RAMState *rs, PageSearchStatus *pss, int pages = -1; uint64_t bytes_xmit = 0; uint8_t *p; - int ret, blen; + int ret; RAMBlock *block = pss->block; ram_addr_t offset = pss->page << TARGET_PAGE_BITS; @@ -1168,23 +1168,23 @@ static int ram_save_compressed_page(RAMState *rs, PageSearchStatus *pss, if (block != rs->last_sent_block) { flush_compressed_data(rs); pages = save_zero_page(rs, block, offset); - if (pages == -1) { - /* Make sure the first page is sent out before other pages */ - bytes_xmit = save_page_header(rs, rs->f, block, offset | - RAM_SAVE_FLAG_COMPRESS_PAGE); - blen = qemu_put_compression_data(rs->f, p, TARGET_PAGE_SIZE, - migrate_compress_level()); - if (blen > 0) { - ram_counters.transferred += bytes_xmit + blen; - ram_counters.normal++; - pages = 1; - } else { - qemu_file_set_error(rs->f, blen); - error_report("compressed data failed!"); - } - } if (pages > 0) { ram_release_pages(block->idstr, offset, pages); + } else { + /* + * Make sure the first page is sent out before other pages. + * + * we post it as normal page as compression will take much + * CPU resource. + */ + ram_counters.transferred += save_page_header(rs, rs->f, block, + offset | RAM_SAVE_FLAG_PAGE); + qemu_put_buffer_async(rs->f, p, TARGET_PAGE_SIZE, + migrate_release_ram() & + migration_in_postcopy()); + ram_counters.transferred += TARGET_PAGE_SIZE; + ram_counters.normal++; + pages = 1; } } else { pages = save_zero_page(rs, block, offset); -- 1.8.3.1