Hello,
On Tue, 20 Jan 2015, Chris Caputo wrote:
> On Tue, 20 Jan 2015, Julian Anastasov wrote:
> > > + (u64)dr * (u64)lwgt < (u64)lr * (u64)dwgt ||
> [...]
> > > + (dr == lr && dwgt > lwgt)) {
> >
> > Above check is redundant.
>
> I accepted your feedback and applied it to the below, except for this
> item. I believe if dr and lr are zero (no traffic), we still want to
> choose the higher weight, thus a separate comparison is needed.
ok
> + spin_lock_bh(&svc->sched_lock);
> + p = (struct list_head *)svc->sched_data;
> + last = dest = list_entry(p, struct ip_vs_dest, n_list);
> +
> + do {
> + list_for_each_entry_continue_rcu(dest,
> + &svc->destinations,
> + n_list) {
> + dwgt = (u32)atomic_read(&dest->weight);
> + if (!(dest->flags & IP_VS_DEST_F_OVERLOAD) &&
> + dwgt > 0) {
> + spin_lock(&dest->stats.lock);
May be there is a way to avoid this spin_lock
by using u64_stats_fetch_begin and corresponding
u64_stats_update_begin in estimation_timer(). We can
even remove this ->lock, it will be replaced by ->syncp.
The benefit is for 64-bit platforms where we avoid
lock here in the scheduler. Otherwise, I don't see
other implementation problems in this patch and I'll
check it more carefully this weekend.
Regards
--
Julian Anastasov <ja@xxxxxx>
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