dm bio prison v1: improve concurrent IO performance

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Split the bio prison into multiple regions, with a separate rbtree and
associated lock for each region.

To get fast bio prison locking and not damage the performance of
discards too much the bio-prison now stipulates that discards should
not cross a BIO_PRISON_MAX_RANGE boundary.

Because the range of a key (block_end - block_begin) must not exceed
BIO_PRISON_MAX_RANGE: break_up_discard_bio() now ensures the data
range reflected in PHYSICAL key doesn't exceed BIO_PRISON_MAX_RANGE.
And splitting the thin target's discards (handled with VIRTUAL key) is
achieved by updating dm-thin.c to set limits->max_discard_sectors in
terms of BIO_PRISON_MAX_RANGE _and_ setting the thin and thin-pool
targets' max_discard_granularity to true.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>

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Joe Thornber 2023-03-02 09:35:37 +00:00 • committed by Mike Snitzer

parent 06961c487a

commit e2dd8aca2d

3 changed files with 121 additions and 68 deletions

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87

drivers/md/dm-bio-prison-v1.c

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10

drivers/md/dm-bio-prison-v1.h

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92

drivers/md/dm-thin.c

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