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SubjectRe: [Xen-devel] [PATCH v4 2/2] xen/block: add multi-page ring support
Hi,

On 20/05/15 14:10, Bob Liu wrote:
> ---
> drivers/block/xen-blkback/blkback.c | 12 ++++
> drivers/block/xen-blkback/common.h | 3 +-
> drivers/block/xen-blkback/xenbus.c | 85 +++++++++++++++++++++-------
> drivers/block/xen-blkfront.c | 110 ++++++++++++++++++++++++++----------
> 4 files changed, 161 insertions(+), 49 deletions(-)
>
> diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
> index 713fc9f..057890f 100644
> --- a/drivers/block/xen-blkback/blkback.c
> +++ b/drivers/block/xen-blkback/blkback.c
> @@ -84,6 +84,12 @@ MODULE_PARM_DESC(max_persistent_grants,
> "Maximum number of grants to map persistently");
>
> /*
> + * Maximum number of pages to be used as the ring between front and backend
> + */
> +unsigned int xen_blkif_max_ring_order = XENBUS_MAX_RING_PAGE_ORDER;

We will soon support 64KB page granularity with ARM64, although the PV
protocol will keep a 4KB page granularity.

Can you clarify with granularity is used here? The one of the host or
the one of the PV protocol?

> +module_param_named(max_ring_page_order, xen_blkif_max_ring_order, int, S_IRUGO);
> +MODULE_PARM_DESC(max_ring_page_order, "Maximum order of pages to be used as the ring");
> +/*
> * The LRU mechanism to clean the lists of persistent grants needs to
> * be executed periodically. The time interval between consecutive executions
> * of the purge mechanism is set in ms.

Regards,

--
Julien Grall


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