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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>
This commit is contained in:
Dr. David Alan Gilbert 2015-12-16 11:47:37 +00:00 committed by Amit Shah
parent 4addcd4fdc
commit 063e760a5f
1 changed files with 4 additions and 2 deletions
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6
migration/ram.c
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@ -2088,10 +2088,12 @@ static int load_xbzrle(QEMUFile *f, ram_addr_t addr, void *host)
{ {
unsigned int xh_len; unsigned int xh_len;
int xh_flags; int xh_flags;
uint8_t *loaded_data;
if (!xbzrle_decoded_buf) { if (!xbzrle_decoded_buf) {
xbzrle_decoded_buf = g_malloc(TARGET_PAGE_SIZE); xbzrle_decoded_buf = g_malloc(TARGET_PAGE_SIZE);
} }
loaded_data = xbzrle_decoded_buf;
/* extract RLE header */ /* extract RLE header */
xh_flags = qemu_get_byte(f); xh_flags = qemu_get_byte(f);
@ -2107,10 +2109,10 @@ static int load_xbzrle(QEMUFile *f, ram_addr_t addr, void *host)
return -1; return -1;
} }
/* load data and decode */ /* 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 */ /* 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) { TARGET_PAGE_SIZE) == -1) {
error_report("Failed to load XBZRLE page - decode error!"); error_report("Failed to load XBZRLE page - decode error!");
return -1; return -1;