Patchwork [v4,7/8] Use qemu_put_buffer_async for guest memory pages

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Submitter Orit Wasserman
Date March 21, 2013, 6:34 p.m.
Message ID <1363890878-8161-8-git-send-email-owasserm@redhat.com>
Download mbox | patch
Permalink /patch/229801/
State New
Headers show

Comments

Orit Wasserman - March 21, 2013, 6:34 p.m.
This will remove an unneeded copy of guest memory pages.
For the page header and device state we still copy the data to the
static buffer the other option is to allocate the memory on demand
which is more expensive.

Signed-off-by: Orit Wasserman <owasserm@redhat.com>
---
 arch_init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch

diff --git a/arch_init.c b/arch_init.c
index 98e2bc6..aa56a20 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -481,7 +481,7 @@  static int ram_save_block(QEMUFile *f, bool last_stage)
             /* XBZRLE overflow or normal page */
             if (bytes_sent == -1) {
                 bytes_sent = save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_PAGE);
-                qemu_put_buffer(f, p, TARGET_PAGE_SIZE);
+                qemu_put_buffer_async(f, p, TARGET_PAGE_SIZE);
                 bytes_sent += TARGET_PAGE_SIZE;
                 acct_info.norm_pages++;
             }