On Mon, 09 Jan 2012 17:35:26 +0100, Christoph Lameter <cl@xxxxxxxxx> wrote:
On Sun, 8 Jan 2012, Gilad Ben-Yossef wrote:
@@ -67,6 +67,14 @@ DEFINE_PER_CPU(int, numa_node);
EXPORT_PER_CPU_SYMBOL(numa_node);
#endif
+/*
+ * A global cpumask of CPUs with per-cpu pages that gets
+ * recomputed on each drain. We use a global cpumask
+ * here to avoid allocation on direct reclaim code path
+ * for CONFIG_CPUMASK_OFFSTACK=y
+ */
+static cpumask_var_t cpus_with_pcps;
Move the static definition into drain_all_pages()?
This is initialised in setup_per_cpu_pageset() so it needs to be file scoped.
+
#ifdef CONFIG_HAVE_MEMORYLESS_NODES
/*
* N.B., Do NOT reference the '_numa_mem_' per cpu variable directly.
@@ -1097,7 +1105,19 @@ void drain_local_pages(void *arg)
*/
void drain_all_pages(void)
{
- on_each_cpu(drain_local_pages, NULL, 1);
+ int cpu;
+ struct per_cpu_pageset *pcp;
+ struct zone *zone;
+
+ for_each_online_cpu(cpu)
+ for_each_populated_zone(zone) {
+ pcp = per_cpu_ptr(zone->pageset, cpu);
+ if (pcp->pcp.count)
+ cpumask_set_cpu(cpu, cpus_with_pcps);
+ else
+ cpumask_clear_cpu(cpu, cpus_with_pcps);
+ }
+ on_each_cpu_mask(cpus_with_pcps, drain_local_pages, NULL, 1);
}
#ifdef CONFIG_HIBERNATION
@@ -3601,6 +3621,10 @@ static void setup_zone_pageset(struct zone *zone)
void __init setup_per_cpu_pageset(void)
{
struct zone *zone;
+ int ret;
+
+ ret = zalloc_cpumask_var(&cpus_with_pcps, GFP_KERNEL);
+ BUG_ON(!ret);
for_each_populated_zone(zone)
setup_zone_pageset(zone);
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