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Commit 1d7ac6ae authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Thomas Gleixner
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mm/writeback: Convert to hotplug state machine



Install the callbacks via the state machine and let the core invoke
the callbacks on the already online CPUs.

Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Jens Axboe <axboe@fb.com>
Cc: linux-mm@kvack.org
Cc: rt@linutronix.de
Cc: Tejun Heo <tj@kernel.org>
Link: http://lkml.kernel.org/r/20160818125731.27256-6-bigeasy@linutronix.de


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent a96a87bf
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+1 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ enum cpuhp_state {
	CPUHP_X86_APB_DEAD,
	CPUHP_VIRT_NET_DEAD,
	CPUHP_SLUB_DEAD,
	CPUHP_MM_WRITEBACK_DEAD,
	CPUHP_WORKQUEUE_PREP,
	CPUHP_POWER_NUMA_PREPARE,
	CPUHP_HRTIMERS_PREPARE,
+7 −19
Original line number Diff line number Diff line
@@ -2080,26 +2080,12 @@ void writeback_set_ratelimit(void)
		ratelimit_pages = 16;
}

static int
ratelimit_handler(struct notifier_block *self, unsigned long action,
		  void *hcpu)
static int page_writeback_cpu_online(unsigned int cpu)
{

	switch (action & ~CPU_TASKS_FROZEN) {
	case CPU_ONLINE:
	case CPU_DEAD:
	writeback_set_ratelimit();
		return NOTIFY_OK;
	default:
		return NOTIFY_DONE;
	}
	return 0;
}

static struct notifier_block ratelimit_nb = {
	.notifier_call	= ratelimit_handler,
	.next		= NULL,
};

/*
 * Called early on to tune the page writeback dirty limits.
 *
@@ -2122,8 +2108,10 @@ void __init page_writeback_init(void)
{
	BUG_ON(wb_domain_init(&global_wb_domain, GFP_KERNEL));

	writeback_set_ratelimit();
	register_cpu_notifier(&ratelimit_nb);
	cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "mm/writeback:online",
			  page_writeback_cpu_online, NULL);
	cpuhp_setup_state(CPUHP_MM_WRITEBACK_DEAD, "mm/writeback:dead", NULL,
			  page_writeback_cpu_online);
}

/**