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authorDr. David Alan Gilbert <dgilbert@redhat.com>2015-12-16 11:47:37 +0000
committerAmit Shah <amit.shah@redhat.com>2016-01-13 16:02:37 +0530
commit063e760a5f52d9b82946956e7046828b524727af (patch)
treefe07070c23ec57213bad71cfdd91a3cd3a823e24
parent4addcd4fdc94c369f4cd54f8e03396ff26fce34d (diff)
downloadqemu-arm-063e760a5f52d9b82946956e7046828b524727af.tar.gz
Use qemu_get_buffer_in_place for xbzrle data
Avoid a data copy (if we're lucky) in the xbzrle code. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Amit Shah <amit.shah@redhat.com> Message-Id: <1450266458-3178-6-git-send-email-dgilbert@redhat.com> Signed-off-by: Amit Shah <amit.shah@redhat.com>
-rw-r--r--migration/ram.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/migration/ram.c b/migration/ram.c
index 102d1f2b14..994552c57b 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -2088,10 +2088,12 @@ static int load_xbzrle(QEMUFile *f, ram_addr_t addr, void *host)
{
unsigned int xh_len;
int xh_flags;
+ uint8_t *loaded_data;
if (!xbzrle_decoded_buf) {
xbzrle_decoded_buf = g_malloc(TARGET_PAGE_SIZE);
}
+ loaded_data = xbzrle_decoded_buf;
/* extract RLE header */
xh_flags = qemu_get_byte(f);
@@ -2107,10 +2109,10 @@ static int load_xbzrle(QEMUFile *f, ram_addr_t addr, void *host)
return -1;
}
/* load data and decode */
- qemu_get_buffer(f, xbzrle_decoded_buf, xh_len);
+ qemu_get_buffer_in_place(f, &loaded_data, xh_len);
/* decode RLE */
- if (xbzrle_decode_buffer(xbzrle_decoded_buf, xh_len, host,
+ if (xbzrle_decode_buffer(loaded_data, xh_len, host,
TARGET_PAGE_SIZE) == -1) {
error_report("Failed to load XBZRLE page - decode error!");
return -1;