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bcache: Better full stripe scanning

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The old scanning-by-stripe code burned too much CPU, this should be
better.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
This commit is contained in:
Kent Overstreet
2013-10-31 15:43:22 -07:00
parent 17e21a9f24
commit 48a915a87f
6 changed files with 128 additions and 57 deletions
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21
drivers/md/bcache/writeback.h
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@@ -14,22 +14,27 @@ static inline uint64_t bcache_dev_sectors_dirty(struct bcache_device *d)
return ret;
}
static inline bool bcache_dev_stripe_dirty(struct bcache_device *d,
static inline unsigned offset_to_stripe(struct bcache_device *d,
uint64_t offset)
{
do_div(offset, d->stripe_size);
return offset;
}
static inline bool bcache_dev_stripe_dirty(struct cached_dev *dc,
uint64_t offset,
unsigned nr_sectors)
{
uint64_t stripe = offset;
do_div(stripe, d->stripe_size);
unsigned stripe = offset_to_stripe(&dc->disk, offset);
while (1) {
if (atomic_read(d->stripe_sectors_dirty + stripe))
if (atomic_read(dc->disk.stripe_sectors_dirty + stripe))
return true;
if (nr_sectors <= d->stripe_size)
if (nr_sectors <= dc->disk.stripe_size)
return false;
nr_sectors -= d->stripe_size;
nr_sectors -= dc->disk.stripe_size;
stripe++;
}
}
@@ -45,7 +50,7 @@ static inline bool should_writeback(struct cached_dev *dc, struct bio *bio,
return false;
if (dc->partial_stripes_expensive &&
bcache_dev_stripe_dirty(&dc->disk, bio->bi_sector,
bcache_dev_stripe_dirty(dc, bio->bi_sector,
bio_sectors(bio)))
return true;