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| author | Wei Yang <richardw.yang@linux.intel.com> | 2019-11-07 20:39:02 +0800 |
|---|---|---|
| committer | Juan Quintela <quintela@redhat.com> | 2020-01-20 09:10:23 +0100 |
| commit | 2e36bc1b884a6fc6bc626b13db4960773ad976f7 (patch) | |
| tree | b1ef4cab7e96e144cadc87bd8a10acf147820a24 /migration/ram.c | |
| parent | e65cec5e5d97927d22b39167d3e8edeffc771788 (diff) | |
| download | qemu-2e36bc1b884a6fc6bc626b13db4960773ad976f7.zip qemu-2e36bc1b884a6fc6bc626b13db4960773ad976f7.tar.gz qemu-2e36bc1b884a6fc6bc626b13db4960773ad976f7.tar.bz2 | |
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>
Diffstat (limited to 'migration/ram.c')
| -rw-r--r-- | migration/ram.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/migration/ram.c b/migration/ram.c index 5cd0664..bdb0316 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -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; } |