neighbour: Don't let neigh_forced_gc() disable preemption for long

We are seeing cases where neigh_cleanup_and_release() is called by
neigh_forced_gc() many times in a row with preemption turned off.
When running on a low powered CPU at a low CPU frequency, this has
been measured to keep preemption off for ~10 ms. That's not great on a
system with HZ=1000 which expects tasks to be able to schedule in
with ~1ms latency.

Suggested-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Judy Hsiao <judyhsiao@chromium.org>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index df81c1f0a57047e176b7c7e4809d2dae59ba6be5..552719c3bbc3d7869c49028f4c5c9102d1ae9b0a 100644 (file)
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -253,9 +253,11 @@ static int neigh_forced_gc(struct neigh_table *tbl)
 {
        int max_clean = atomic_read(&tbl->gc_entries) -
                        READ_ONCE(tbl->gc_thresh2);
+       u64 tmax = ktime_get_ns() + NSEC_PER_MSEC;
        unsigned long tref = jiffies - 5 * HZ;
        struct neighbour *n, *tmp;
        int shrunk = 0;
+       int loop = 0;
 
        NEIGH_CACHE_STAT_INC(tbl, forced_gc_runs);
 
@@ -278,11 +280,16 @@ static int neigh_forced_gc(struct neigh_table *tbl)
                                shrunk++;
                        if (shrunk >= max_clean)
                                break;
+                       if (++loop == 16) {
+                               if (ktime_get_ns() > tmax)
+                                       goto unlock;
+                               loop = 0;
+                       }
                }
        }
 
        WRITE_ONCE(tbl->last_flush, jiffies);
-
+unlock:
        write_unlock_bh(&tbl->lock);
 
        return shrunk;