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authorKevin Wolf <kwolf@redhat.com>2013-04-05 21:27:54 +0200
committerStefan Hajnoczi <stefanha@redhat.com>2013-04-15 08:26:18 +0200
commit05fcc84888cfabec2267851415b66395a73a0f5f (patch)
tree62416f941e2ab9de336733c22d3619e30c3dfbdd /savevm.c
parentcf8074b3825f7229a20c60e679511592bde41340 (diff)
downloadqemu-arm-05fcc84888cfabec2267851415b66395a73a0f5f.tar.gz
savevm: Implement block_writev_buffer()
Instead of breaking up RAM state into many small chunks, pass the iovec to the block layer for better performance. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'savevm.c')
-rw-r--r--savevm.c25
1 files changed, 21 insertions, 4 deletions
diff --git a/savevm.c b/savevm.c
index b1d8988c78..88fe985f93 100644
--- a/savevm.c
+++ b/savevm.c
@@ -176,7 +176,8 @@ static void coroutine_fn yield_until_fd_readable(int fd)
qemu_coroutine_yield();
}
-static ssize_t socket_writev_buffer(void *opaque, struct iovec *iov, int iovcnt)
+static ssize_t socket_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
+ int64_t pos)
{
QEMUFileSocket *s = opaque;
ssize_t len;
@@ -458,6 +459,21 @@ fail:
return NULL;
}
+static ssize_t block_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
+ int64_t pos)
+{
+ int ret;
+ QEMUIOVector qiov;
+
+ qemu_iovec_init_external(&qiov, iov, iovcnt);
+ ret = bdrv_writev_vmstate(opaque, &qiov, pos);
+ if (ret < 0) {
+ return ret;
+ }
+
+ return qiov.size;
+}
+
static int block_put_buffer(void *opaque, const uint8_t *buf,
int64_t pos, int size)
{
@@ -481,8 +497,9 @@ static const QEMUFileOps bdrv_read_ops = {
};
static const QEMUFileOps bdrv_write_ops = {
- .put_buffer = block_put_buffer,
- .close = bdrv_fclose
+ .put_buffer = block_put_buffer,
+ .writev_buffer = block_writev_buffer,
+ .close = bdrv_fclose
};
static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
@@ -533,7 +550,7 @@ static void qemu_fflush(QEMUFile *f)
if (f->is_write && f->iovcnt > 0) {
if (f->ops->writev_buffer) {
- ret = f->ops->writev_buffer(f->opaque, f->iov, f->iovcnt);
+ ret = f->ops->writev_buffer(f->opaque, f->iov, f->iovcnt, f->pos);
if (ret >= 0) {
f->pos += ret;
}