Commit 2e36bc1b authored by Wei Yang's avatar Wei Yang Committed by Juan Quintela
Browse files

migration/postcopy: reduce memset when it is zero page and matches_target_page_size 



In this case, page_buffer content would not be used.

Skip this to save some time.

Signed-off-by: default avatarWei Yang <richardw.yang@linux.intel.com>
Reviewed-by: default avatarDr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: default avatarJuan Quintela <quintela@redhat.com>
Signed-off-by: default avatarJuan Quintela <quintela@redhat.com>
parent e65cec5e

migration/ram.c

+7 −1
Original line number Diff line number Diff line
@@ -4126,7 +4126,13 @@ static int ram_load_postcopy(QEMUFile *f) 
        switch (flags & ~RAM_SAVE_FLAG_CONTINUE) {

        case RAM_SAVE_FLAG_ZERO:

            ch = qemu_get_byte(f);

            /*

             * Can skip to set page_buffer when

             * this is a zero page and (block->page_size == TARGET_PAGE_SIZE).

             */

            if (ch || !matches_target_page_size) {

                memset(page_buffer, ch, TARGET_PAGE_SIZE);

            }

            if (ch) {

                all_zero = false;

            }