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netfilter: nf_queue: place volatile data in own cacheline 

As the comment indicates, the data at the end of nfqnl_instance struct is
written on every queue/dequeue, so it should reside in its own cacheline.

Before this change, 'lock' was in first cacheline so we dirtied both.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2016-10-31 00:35:07 +01:00 committed by Pablo Neira Ayuso
parent e41e9d623c
commit 886bc50348
1 changed files with 1 additions and 1 deletions
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net/netfilter/nfnetlink_queue.c
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@ -69,7 +69,7 @@ struct nfqnl_instance {
* Following fields are dirtied for each queued packet,
* keep them in same cache line if possible.
*/
spinlock_t lock;
spinlock_t lock ____cacheline_aligned_in_smp;
unsigned int queue_total;
unsigned int id_sequence; /* 'sequence' of pkt ids */
struct list_head queue_list; /* packets in queue */