On Wed, 2013-10-02 at 21:44 -0700, Alexei Starovoitov wrote:
> I think ifdef config_x86 is a bit ugly inside struct sk_filter, but
> don't mind whichever way.
Its not fair to make sk_filter bigger, because it means that simple (non
JIT) filter might need an extra cache line.
You could presumably use the following layout instead :
struct sk_filter
{
atomic_t refcnt;
struct rcu_head rcu;
struct work_struct work;
unsigned int len ____cacheline_aligned; /* Number of
filter blocks */
unsigned int (*bpf_func)(const struct sk_buff *skb,
const struct sock_filter *filter);
struct sock_filter insns[0];
};
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