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

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In this case, page_buffer content would not be used.

Skip this to save some time.

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Wei Yang 2019-11-07 20:39:02 +08:00 committed by Juan Quintela
parent e65cec5e5d
commit 2e36bc1b88
1 changed files with 7 additions and 1 deletions
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8
migration/ram.c
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@ -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);
memset(page_buffer, ch, TARGET_PAGE_SIZE);
/*
* 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;
}