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mirror_qemu
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Store the data to send also in iovec 

All data is still copied into the static buffer.
Adjacent iovecs are coalesced so we send one big buffer
instead of many small buffers.

Signed-off-by: Orit Wasserman <owasserm@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
master
Orit Wasserman 2013-03-22 16:48:00 +02:00 committed by Juan Quintela
parent 7d8a30bb98
commit b3ea2bdb79
1 changed files with 22 additions and 2 deletions
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24
savevm.c
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@ -114,6 +114,7 @@ void qemu_announce_self(void)
/* savevm/loadvm support */
#define IO_BUF_SIZE 32768
#define MAX_IOV_SIZE MIN(IOV_MAX, 64)
struct QEMUFile {
const QEMUFileOps *ops;
@ -129,6 +130,9 @@ struct QEMUFile {
int buf_size; /* 0 when writing */
uint8_t buf[IO_BUF_SIZE];
struct iovec iov[MAX_IOV_SIZE];
unsigned int iovcnt;
int last_error;
};
@ -528,6 +532,7 @@ static void qemu_fflush(QEMUFile *f)
f->pos += f->buf_index;
}
f->buf_index = 0;
f->iovcnt = 0;
}
if (ret < 0) {
qemu_file_set_error(f, ret);
@ -601,6 +606,18 @@ int qemu_fclose(QEMUFile *f)
return ret;
}
static void add_to_iovec(QEMUFile *f, const uint8_t *buf, int size)
{
/* check for adjacent buffer and coalesce them */
if (f->iovcnt > 0 && buf == f->iov[f->iovcnt - 1].iov_base +
f->iov[f->iovcnt - 1].iov_len) {
f->iov[f->iovcnt - 1].iov_len += size;
} else {
f->iov[f->iovcnt].iov_base = (uint8_t *)buf;
f->iov[f->iovcnt++].iov_len = size;
}
}
void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
{
int l;
@ -620,12 +637,13 @@ void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
if (l > size)
l = size;
memcpy(f->buf + f->buf_index, buf, l);
add_to_iovec(f, f->buf + f->buf_index, l);
f->is_write = 1;
f->buf_index += l;
f->bytes_xfer += l;
buf += l;
size -= l;
if (f->buf_index >= IO_BUF_SIZE) {
if (f->buf_index >= IO_BUF_SIZE || f->iovcnt >= MAX_IOV_SIZE) {
qemu_fflush(f);
if (qemu_file_get_error(f)) {
break;
@ -650,7 +668,9 @@ void qemu_put_byte(QEMUFile *f, int v)
f->is_write = 1;
f->bytes_xfer++;
if (f->buf_index >= IO_BUF_SIZE) {
add_to_iovec(f, f->buf + (f->buf_index - 1), 1);
if (f->buf_index >= IO_BUF_SIZE || f->iovcnt >= MAX_IOV_SIZE) {
qemu_fflush(f);
}
}