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On Fri, Apr 26, 2013 at 08:15:34AM +0200, Ingo Molnar wrote:
>
> * Simon Horman <horms@xxxxxxxxxxxx> wrote:
>
> > This avoids the situation where a dump of a large number of connections
> > may prevent scheduling for a long time while also avoiding excessive
> > calls to rcu_read_unlock() and rcu_read_lock().
> >
> > Cc: Eric Dumazet <eric.dumazet@xxxxxxxxx>
> > Cc: Julian Anastasov <ja@xxxxxx>
> > Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
> > ---
> > net/netfilter/ipvs/ip_vs_conn.c | 6 ++----
> > 1 file changed, 2 insertions(+), 4 deletions(-)
> >
> > diff --git a/net/netfilter/ipvs/ip_vs_conn.c
> > b/net/netfilter/ipvs/ip_vs_conn.c
> > index a083bda..42a7b33 100644
> > --- a/net/netfilter/ipvs/ip_vs_conn.c
> > +++ b/net/netfilter/ipvs/ip_vs_conn.c
> > @@ -975,8 +975,7 @@ static void *ip_vs_conn_array(struct seq_file *seq,
> > loff_t pos)
> > return cp;
> > }
> > }
> > - rcu_read_unlock();
> > - rcu_read_lock();
> > + cond_resched_rcu_lock();
> > }
> >
> > return NULL;
> > @@ -1015,8 +1014,7 @@ static void *ip_vs_conn_seq_next(struct seq_file
> > *seq, void *v, loff_t *pos)
> > iter->l = &ip_vs_conn_tab[idx];
> > return cp;
> > }
> > - rcu_read_unlock();
> > - rcu_read_lock();
> > + cond_resched_rcu_lock();
>
> Feel free to route this via the networking tree.
>
> Note that this change isn't a pure clean-up but has functional effects as
> well: on !PREEMPT or PREEMPT_VOLUNTARY kernels it will add in a potential
> cond_resched() - while previously it would only rcu unlock and relock
> (which in itself isn't scheduling).
>
> This should probably be pointed out in the changelog.
Thanks, I have added some text which I will include in v2.
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