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Commit 1d7ac6ae authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Thomas Gleixner
Browse files

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

include/linux/cpuhotplug.h

+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,

mm/page-writeback.c

+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);

}



/**