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virtio-blk: avoid g_slice_new0() for VirtIOBlockReq and VirtQueueElement 

In commit de6c8042ec ("virtio-blk: Avoid
zeroing every request structure") we avoided the 40 KB memset when
allocating VirtIOBlockReq.

The memset was reintroduced in commit
671ec3f056 ("virtio-blk: Convert
VirtIOBlockReq.elem to pointer").

It must be fixed again to avoid a performance regression.

Cc: Fam Zheng <famz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2014-07-09 10:05:48 +02:00 committed by Kevin Wolf
parent abd764250f
commit 869d66af53
1 changed files with 4 additions and 2 deletions
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6
hw/block/virtio-blk.c
View File

@ -31,9 +31,11 @@
static VirtIOBlockReq *virtio_blk_alloc_request(VirtIOBlock *s)
{
VirtIOBlockReq *req = g_slice_new0(VirtIOBlockReq);
VirtIOBlockReq *req = g_slice_new(VirtIOBlockReq);
req->dev = s;
req->elem = g_slice_new0(VirtQueueElement);
req->qiov.size = 0;
req->next = NULL;
req->elem = g_slice_new(VirtQueueElement);
return req;
}