From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54304) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fconh-0002xb-SQ for qemu-devel@nongnu.org; Tue, 10 Jul 2018 05:19:17 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fcong-0002vf-U2 for qemu-devel@nongnu.org; Tue, 10 Jul 2018 05:19:13 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:36598 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fcong-0002vS-OJ for qemu-devel@nongnu.org; Tue, 10 Jul 2018 05:19:12 -0400 From: Peter Xu Date: Tue, 10 Jul 2018 17:18:53 +0800 Message-Id: <20180710091902.28780-2-peterx@redhat.com> In-Reply-To: <20180710091902.28780-1-peterx@redhat.com> References: <20180710091902.28780-1-peterx@redhat.com> Subject: [Qemu-devel] [PATCH for-3.0 v2 01/10] migration: simplify check to use qemu file buffer List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: peterx@redhat.com, Juan Quintela , "Dr . David Alan Gilbert" , Balamuruhan S Firstly, renaming the old matching_page_sizes variable to matches_target_page_size, which suites more to what it did (it only checks against target page size rather than multiple page sizes). Meanwhile, simplify the check logic a bit, and enhance the comments. Should have no functional change. Reviewed-by: Dr. David Alan Gilbert Reviewed-by: Juan Quintela Signed-off-by: Peter Xu --- migration/ram.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/migration/ram.c b/migration/ram.c index 23cea47090..49068e86d3 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -3580,7 +3580,7 @@ static int ram_load_postcopy(QEMUFile *f) { int flags = 0, ret = 0; bool place_needed = false; - bool matching_page_sizes = false; + bool matches_target_page_size = false; MigrationIncomingState *mis = migration_incoming_get_current(); /* Temporary page that is later 'placed' */ void *postcopy_host_page = postcopy_get_tmp_page(mis); @@ -3620,7 +3620,7 @@ static int ram_load_postcopy(QEMUFile *f) ret = -EINVAL; break; } - matching_page_sizes = block->page_size == TARGET_PAGE_SIZE; + matches_target_page_size = block->page_size == TARGET_PAGE_SIZE; /* * Postcopy requires that we place whole host pages atomically; * these may be huge pages for RAMBlocks that are backed by @@ -3668,12 +3668,17 @@ static int ram_load_postcopy(QEMUFile *f) case RAM_SAVE_FLAG_PAGE: all_zero = false; - if (!place_needed || !matching_page_sizes) { + if (!matches_target_page_size) { + /* For huge pages, we always use temporary buffer */ qemu_get_buffer(f, page_buffer, TARGET_PAGE_SIZE); } else { - /* Avoids the qemu_file copy during postcopy, which is - * going to do a copy later; can only do it when we - * do this read in one go (matching page sizes) + /* + * For small pages that matches target page size, we + * avoid the qemu_file copy. Instead we directly use + * the buffer of QEMUFile to place the page. Note: we + * cannot do any QEMUFile operation before using that + * buffer to make sure the buffer is valid when + * placing the page. */ qemu_get_buffer_in_place(f, (uint8_t **)&place_source, TARGET_PAGE_SIZE); -- 2.17.1