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mm: use part per 1000000 for bdi ratios

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To get finer granularity for ratio calculations use part per million
instead of percentiles. This is especially important if we want to
automatically convert byte values to ratios. Otherwise the values that
are actually used can be quite different. This is also important for
machines with more main memory (1% of 256GB is already 2.5GB).

Link: https://lkml.kernel.org/r/20221119005215.3052436-5-shr@devkernel.io
Signed-off-by: Stefan Roesch <shr@devkernel.io>
Cc: Chris Mason <clm@meta.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Stefan Roesch
2022-11-18 16:51:59 -08:00
committed by Andrew Morton
parent 16b837eb84
commit ae82291e9c
3 changed files with 15 additions and 9 deletions
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6
mm/backing-dev.c
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@@ -178,7 +178,7 @@ static ssize_t min_ratio_store(struct device *dev,
return ret;
}
BDI_SHOW(min_ratio, bdi->min_ratio)
BDI_SHOW(min_ratio, bdi->min_ratio / BDI_RATIO_SCALE)
static ssize_t max_ratio_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
@@ -197,7 +197,7 @@ static ssize_t max_ratio_store(struct device *dev,
return ret;
}
BDI_SHOW(max_ratio, bdi->max_ratio)
BDI_SHOW(max_ratio, bdi->max_ratio / BDI_RATIO_SCALE)
static ssize_t stable_pages_required_show(struct device *dev,
struct device_attribute *attr,
@@ -809,7 +809,7 @@ int bdi_init(struct backing_dev_info *bdi)
kref_init(&bdi->refcnt);
bdi->min_ratio = 0;
bdi->max_ratio = 100;
bdi->max_ratio = 100 * BDI_RATIO_SCALE;
bdi->max_prop_frac = FPROP_FRAC_BASE;
INIT_LIST_HEAD(&bdi->bdi_list);
INIT_LIST_HEAD(&bdi->wb_list);