Commit-ID: 005fd4bbef168e9dea896085b001d64369e9834a
Gitweb: http://git.kernel.org/tip/005fd4bbef168e9dea896085b001d64369e9834a
Author: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
AuthorDate: Thu, 3 Nov 2016 15:50:02 +0100
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Wed, 9 Nov 2016 23:45:27 +0100
mm/page_alloc: Convert to hotplug state machine
Install the callbacks via the state machine.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: rt@xxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/20161103145021.28528-7-bigeasy@xxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
include/linux/cpuhotplug.h | 1 +
mm/page_alloc.c | 49 +++++++++++++++++++++++-----------------------
2 files changed, 26 insertions(+), 24 deletions(-)
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 89310fb..31c58f6 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -35,6 +35,7 @@ enum cpuhp_state {
CPUHP_MM_MEMCQ_DEAD,
CPUHP_PERCPU_CNT_DEAD,
CPUHP_RADIX_DEAD,
+ CPUHP_PAGE_ALLOC_DEAD,
CPUHP_WORKQUEUE_PREP,
CPUHP_POWER_NUMA_PREPARE,
CPUHP_HRTIMERS_PREPARE,
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 072d791..fc98c2b 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6491,38 +6491,39 @@ void __init free_area_init(unsigned long *zones_size)
__pa(PAGE_OFFSET) >> PAGE_SHIFT, NULL);
}
-static int page_alloc_cpu_notify(struct notifier_block *self,
- unsigned long action, void *hcpu)
+static int page_alloc_cpu_dead(unsigned int cpu)
{
- int cpu = (unsigned long)hcpu;
- if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) {
- lru_add_drain_cpu(cpu);
- drain_pages(cpu);
+ lru_add_drain_cpu(cpu);
+ drain_pages(cpu);
- /*
- * Spill the event counters of the dead processor
- * into the current processors event counters.
- * This artificially elevates the count of the current
- * processor.
- */
- vm_events_fold_cpu(cpu);
+ /*
+ * Spill the event counters of the dead processor
+ * into the current processors event counters.
+ * This artificially elevates the count of the current
+ * processor.
+ */
+ vm_events_fold_cpu(cpu);
- /*
- * Zero the differential counters of the dead processor
- * so that the vm statistics are consistent.
- *
- * This is only okay since the processor is dead and cannot
- * race with what we are doing.
- */
- cpu_vm_stats_fold(cpu);
- }
- return NOTIFY_OK;
+ /*
+ * Zero the differential counters of the dead processor
+ * so that the vm statistics are consistent.
+ *
+ * This is only okay since the processor is dead and cannot
+ * race with what we are doing.
+ */
+ cpu_vm_stats_fold(cpu);
+ return 0;
}
void __init page_alloc_init(void)
{
- hotcpu_notifier(page_alloc_cpu_notify, 0);
+ int ret;
+
+ ret = cpuhp_setup_state_nocalls(CPUHP_PAGE_ALLOC_DEAD,
+ "mm/page_alloc:dead", NULL,
+ page_alloc_cpu_dead);
+ WARN_ON(ret < 0);
}
/*
--
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