Re: [Xen-devel] [PATCH net-next v7 4/9] xen-netback: Introduce TX grant mapping

[David Vrabel <david.vrabel@xxxxxxxxxx>]

On 13/03/14 10:33, Ian Campbell wrote:
> On Thu, 2014-03-06 at 21:48 +0000, Zoltan Kiss wrote:
>> @@ -135,13 +146,31 @@ struct xenvif {
>>      pending_ring_idx_t pending_cons;
>>      u16 pending_ring[MAX_PENDING_REQS];
>>      struct pending_tx_info pending_tx_info[MAX_PENDING_REQS];
>> +    grant_handle_t grant_tx_handle[MAX_PENDING_REQS];
>>  
>>      /* Coalescing tx requests before copying makes number of grant
>>       * copy ops greater or equal to number of slots required. In
>>       * worst case a tx request consumes 2 gnttab_copy.
>>       */
>>      struct gnttab_copy tx_copy_ops[2*MAX_PENDING_REQS];
>> -
>> +    struct gnttab_map_grant_ref tx_map_ops[MAX_PENDING_REQS];
>> +    struct gnttab_unmap_grant_ref tx_unmap_ops[MAX_PENDING_REQS];
> 
> I wonder if we should break some of these arrays into separate
> allocations? Wasn't there a problem with sizeof(struct xenvif) at one
> point?

alloc_netdev() falls back to vmalloc() if the kmalloc failed so there's
no need to split these structures.

David

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