On Fri, Apr 26, 2013 at 08:15:34AM +0200, Ingo Molnar wrote: > > * Simon Horman <ho...@verge.net.au> 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.duma...@gmail.com> > > Cc: Julian Anastasov <j...@ssi.bg> > > Signed-off-by: Simon Horman <ho...@verge.net.au> > > --- > > 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
