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| author | Paolo Valente <paolo.valente@linaro.org> | 2017-08-04 07:35:10 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-08-11 08:58:02 -0600 |
| commit | d5be3fefc9e2db68eacfc7cfe265e2e860e4213f (patch) | |
| tree | 60088e9b8c13acbc492b880ffddc310593f5ed8f /block/bfq-iosched.h | |
| parent | e743eb1ecd5564b5ae0a4a76c1566f748a358839 (diff) | |
| download | op-kernel-dev-d5be3fefc9e2db68eacfc7cfe265e2e860e4213f.zip op-kernel-dev-d5be3fefc9e2db68eacfc7cfe265e2e860e4213f.tar.gz | |
block,bfq: refactor device-idling logic
The logic that decides whether to idle the device is scattered across
three functions. Almost all of the logic is in the function
bfq_bfqq_may_idle, but (1) part of the decision is made in
bfq_update_idle_window, and (2) the function bfq_bfqq_must_idle may
switch off idling regardless of the output of bfq_bfqq_may_idle. In
addition, both bfq_update_idle_window and bfq_bfqq_must_idle make
their decisions as a function of parameters that are used, for similar
purposes, also in bfq_bfqq_may_idle. This commit addresses these
issues by moving all the logic into bfq_bfqq_may_idle.
Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/bfq-iosched.h')
| -rw-r--r-- | block/bfq-iosched.h | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h index 1f74d71..fb28c25 100644 --- a/block/bfq-iosched.h +++ b/block/bfq-iosched.h @@ -348,11 +348,11 @@ struct bfq_io_cq { uint64_t blkcg_serial_nr; /* the current blkcg serial */ #endif /* - * Snapshot of the idle window before merging; taken to - * remember this value while the queue is merged, so as to be - * able to restore it in case of split. + * Snapshot of the has_short_time flag before merging; taken + * to remember its value while the queue is merged, so as to + * be able to restore it in case of split. */ - bool saved_idle_window; + bool saved_has_short_ttime; /* * Same purpose as the previous two fields for the I/O bound * classification of a queue. @@ -626,7 +626,7 @@ enum bfqq_state_flags { * without idling the device */ BFQQF_fifo_expire, /* FIFO checked in this slice */ - BFQQF_idle_window, /* slice idling enabled */ + BFQQF_has_short_ttime, /* queue has a short think time */ BFQQF_sync, /* synchronous queue */ BFQQF_IO_bound, /* * bfqq has timed-out at least once @@ -655,7 +655,7 @@ BFQ_BFQQ_FNS(busy); BFQ_BFQQ_FNS(wait_request); BFQ_BFQQ_FNS(non_blocking_wait_rq); BFQ_BFQQ_FNS(fifo_expire); -BFQ_BFQQ_FNS(idle_window); +BFQ_BFQQ_FNS(has_short_ttime); BFQ_BFQQ_FNS(sync); BFQ_BFQQ_FNS(IO_bound); BFQ_BFQQ_FNS(in_large_burst); |
