linux-master/mm/page-writeback.c

126 	struct wb_domain	*dom;
154 				.dom = &global_wb_domain,		\
157 #define GDTC_INIT_NO_WB		.dom = &global_wb_domain
160 				.dom = mem_cgroup_wb_domain(__wb),	\
166 	return dtc->dom;
171 	return dtc->dom;
556 static void wb_domain_writeout_add(struct wb_domain *dom,
560 	__fprop_add_percpu_max(&dom->completions, completions,
563 	if (unlikely(!dom->period_time)) {
570 		dom->period_time = wp_next_time(jiffies);
571 		mod_timer(&dom->period_timer, dom->period_time);
609 	struct wb_domain *dom = from_timer(dom, t, period_timer);
610 	int miss_periods = (jiffies - dom->period_time) /
613 	if (fprop_new_period(&dom->completions, miss_periods + 1)) {
614 		dom->period_time = wp_next_time(dom->period_time +
616 		mod_timer(&dom->period_timer, dom->period_time);
622 		dom->period_time = 0;
626 int wb_domain_init(struct wb_domain *dom, gfp_t gfp)
628 	memset(dom, 0, sizeof(*dom));
630 	spin_lock_init(&dom->lock);
632 	timer_setup(&dom->period_timer, writeout_period, TIMER_DEFERRABLE);
634 	dom->dirty_limit_tstamp = jiffies;
636 	return fprop_global_init(&dom->completions, gfp);
640 void wb_domain_exit(struct wb_domain *dom)
642 	del_timer_sync(&dom->period_timer);
643 	fprop_global_destroy(&dom->completions);
819 static unsigned long hard_dirty_limit(struct wb_domain *dom,
822 	return max(thresh, dom->dirty_limit);
867 	struct wb_domain *dom = dtc_dom(dtc);
875 	fprop_fraction_percpu(&dom->completions, dtc->wb_completions,
1254 	struct wb_domain *dom = dtc_dom(dtc);
1256 	unsigned long limit = dom->dirty_limit;
1269 	 * dom->dirty_limit which is guaranteed to lie above the dirty pages.
1278 	dom->dirty_limit = limit;
1284 	struct wb_domain *dom = dtc_dom(dtc);
1289 	if (time_before(now, dom->dirty_limit_tstamp + BANDWIDTH_INTERVAL))
1292 	spin_lock(&dom->lock);
1293 	if (time_after_eq(now, dom->dirty_limit_tstamp + BANDWIDTH_INTERVAL)) {
1295 		dom->dirty_limit_tstamp = now;
1297 	spin_unlock(&dom->lock);
2226 	struct wb_domain *dom = &global_wb_domain;
2231 	dom->dirty_limit = dirty_thresh;