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SubjectRe: [Qemu-devel] [PATCH RFC] virtio: put last seen used index into ring itself
On 05/05/2010 11:58 PM, Michael S. Tsirkin wrote:
> + /* We publish the last-seen used index at the end of the available ring.
> + * It is at the end for backwards compatibility. */
> + vr->last_used_idx =&(vr)->avail->ring[num];
> + /* Verify that last used index does not spill over the used ring. */
> + BUG_ON((void *)vr->last_used_idx +
> + sizeof *vr->last_used_idx> (void *)vr->used);
> }
>

Shouldn't this be on its own cache line?

One way to achieve this is to allocate it at the end.

--
error compiling committee.c: too many arguments to function



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