Re: [PATCH 2/2] percpu_counter: Put a reasonable upper bound on percpu_counter_batch

Le vendredi 26 août 2011 à 07:29 +1000, Anton Blanchard a écrit :

+/*
+ * We set the batch at 2 * num_online_cpus(), with a minimum of 32 and
+ * a maximum of 1024.
+ */
 static void compute_batch_value(void)
 {
 	int nr = num_online_cpus();
 
-	percpu_counter_batch = max(32, nr*2);
+	percpu_counter_batch = min(1024, max(32, nr*2));
 }
 
 static int __cpuinit percpu_counter_hotcpu_callback(struct notifier_block *nb,

Or use the following :

percpu_counter_batch = clamp(nr*2, 32, 1024);



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