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block: Convert BDI proportion calculations to flexible proportions

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Convert calculations of proportion of writeback each bdi does to new flexible
proportion code. That allows us to use aging period of fixed wallclock time
which gives better proportion estimates given the hugely varying throughput of
different devices.

Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
This commit is contained in:
Jan Kara
2012-05-24 18:59:11 +02:00
committed by Fengguang Wu
parent e78d4833c0
commit eb608e3a34
3 changed files with 69 additions and 44 deletions
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6
mm/backing-dev.c
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@ -677,7 +677,7 @@ int bdi_init(struct backing_dev_info *bdi)
bdi->min_ratio = 0;
bdi->max_ratio = 100;
bdi->max_prop_frac = PROP_FRAC_BASE;
bdi->max_prop_frac = FPROP_FRAC_BASE;
spin_lock_init(&bdi->wb_lock);
INIT_LIST_HEAD(&bdi->bdi_list);
INIT_LIST_HEAD(&bdi->work_list);
@ -700,7 +700,7 @@ int bdi_init(struct backing_dev_info *bdi)
bdi->write_bandwidth = INIT_BW;
bdi->avg_write_bandwidth = INIT_BW;
err = prop_local_init_percpu(&bdi->completions);
err = fprop_local_init_percpu(&bdi->completions);
if (err) {
err:
@ -744,7 +744,7 @@ void bdi_destroy(struct backing_dev_info *bdi)
for (i = 0; i < NR_BDI_STAT_ITEMS; i++)
percpu_counter_destroy(&bdi->bdi_stat[i]);
prop_local_destroy_percpu(&bdi->completions);
fprop_local_destroy_percpu(&bdi->completions);
}
EXPORT_SYMBOL(bdi_destroy);