From 8888a552bf7af200e36ff123772547dfb4f133c4 Mon Sep 17 00:00:00 2001 From: Peter Xu Date: Fri, 2 Feb 2024 18:28:35 +0800 Subject: [PATCH] migration/multifd: Drop stale comment for multifd zero copy We've already done that with multifd_flush_after_each_section, for multifd in general. Drop the stale "TODO-like" comment. Reviewed-by: Fabiano Rosas Link: https://lore.kernel.org/r/20240202102857.110210-2-peterx@redhat.com Signed-off-by: Peter Xu --- migration/multifd.c | 11 ----------- 1 file changed, 11 deletions(-) diff --git a/migration/multifd.c b/migration/multifd.c index 25cbc6dc6b..eee2586770 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -598,17 +598,6 @@ int multifd_send_sync_main(void) } } - /* - * When using zero-copy, it's necessary to flush the pages before any of - * the pages can be sent again, so we'll make sure the new version of the - * pages will always arrive _later_ than the old pages. - * - * Currently we achieve this by flushing the zero-page requested writes - * per ram iteration, but in the future we could potentially optimize it - * to be less frequent, e.g. only after we finished one whole scanning of - * all the dirty bitmaps. - */ - flush_zero_copy = migrate_zero_copy_send(); for (i = 0; i < migrate_multifd_channels(); i++) {