dynticks: avoid flow_cache_flush() interrupting every core

Previously, if you did an "ifconfig down" or similar on one core, and
the kernel had CONFIG_XFRM enabled, every core would be interrupted to
check its percpu flow list for items that could be garbage collected.

With this change, we generate a mask of cores that actually have any
percpu items, and only interrupt those cores.  When we are trying to
isolate a set of cpus from interrupts, this is important to do.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 39 insertions, 3 deletions

diff --git a/net/core/flow.c b/net/core/flow.c
index c56ea6f7f6c7..7fae13537b6b 100644
--- a/net/core/flow.c
+++ b/net/core/flow.c
@@ -323,6 +323,24 @@ static void flow_cache_flush_tasklet(unsigned long data)
                 complete(&info->completion);
 }
 
+/*
+ * Return whether a cpu needs flushing.  Conservatively, we assume
+ * the presence of any entries means the core may require flushing,
+ * since the flow_cache_ops.check() function may assume it's running
+ * on the same core as the per-cpu cache component.
+ */
+static int flow_cache_percpu_empty(struct flow_cache *fc, int cpu)
+{
+        struct flow_cache_percpu *fcp;
+        int i;
+
+        fcp = &per_cpu(*fc->percpu, cpu);
+        for (i = 0; i < flow_cache_hash_size(fc); i++)
+                if (!hlist_empty(&fcp->hash_table[i]))
+                        return 0;
+        return 1;
+}
+
 static void flow_cache_flush_per_cpu(void *data)
 {
         struct flow_flush_info *info = data;
@@ -337,22 +355,40 @@ void flow_cache_flush(void)
 {
         struct flow_flush_info info;
         static DEFINE_MUTEX(flow_flush_sem);
+        cpumask_var_t mask;
+        int i, self;
+
+        /* Track which cpus need flushing to avoid disturbing all cores. */
+        if (!alloc_cpumask_var(&mask, GFP_KERNEL))
+                return;
+        cpumask_clear(mask);
 
         /* Don't want cpus going down or up during this. */
         get_online_cpus();
         mutex_lock(&flow_flush_sem);
         info.cache = &flow_cache_global;
-        atomic_set(&info.cpuleft, num_online_cpus());
+        for_each_online_cpu(i)
+                if (!flow_cache_percpu_empty(info.cache, i))
+                        cpumask_set_cpu(i, mask);
+        atomic_set(&info.cpuleft, cpumask_weight(mask));
+        if (atomic_read(&info.cpuleft) == 0)
+                goto done;
+
         init_completion(&info.completion);
 
         local_bh_disable();
-        smp_call_function(flow_cache_flush_per_cpu, &info, 0);
-        flow_cache_flush_tasklet((unsigned long)&info);
+        self = cpumask_test_and_clear_cpu(smp_processor_id(), mask);
+        on_each_cpu_mask(mask, flow_cache_flush_per_cpu, &info, 0);
+        if (self)
+                flow_cache_flush_tasklet((unsigned long)&info);
         local_bh_enable();
 
         wait_for_completion(&info.completion);
+
+done:
         mutex_unlock(&flow_flush_sem);
         put_online_cpus();
+        free_cpumask_var(mask);
 }
 
 static void flow_cache_flush_task(struct work_struct *work)