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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: 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>
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@ -4126,7 +4126,13 @@ static int ram_load_postcopy(QEMUFile *f)
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switch (flags & ~RAM_SAVE_FLAG_CONTINUE) {
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case RAM_SAVE_FLAG_ZERO:
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ch = qemu_get_byte(f);
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memset(page_buffer, ch, TARGET_PAGE_SIZE);
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/*
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* Can skip to set page_buffer when
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* this is a zero page and (block->page_size == TARGET_PAGE_SIZE).
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*/
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if (ch || !matches_target_page_size) {
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memset(page_buffer, ch, TARGET_PAGE_SIZE);
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}
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if (ch) {
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all_zero = false;
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}
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