block, bfq: replace mechanism for evaluating I/O intensity

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Some BFQ mechanisms make their decisions on a bfq_queue basing also on
whether the bfq_queue is I/O bound. In this respect, the current logic
for evaluating whether a bfq_queue is I/O bound is rather rough. This
commits replaces this logic with a more effective one.

The new logic measures the percentage of time during which a bfq_queue
is active, and marks the bfq_queue as I/O bound if the latter if this
percentage is above a fixed threshold.

Tested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Paolo Valente 2021-01-25 20:02:43 +01:00 • committed by Jens Axboe

parent 3a905c37c3

commit eb2fd80f9d

2 changed files with 52 additions and 27 deletions

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63

block/bfq-iosched.c

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16

block/bfq-iosched.h

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