block: rename need_dispatch to piecemeal_dispatch in blk-mq sched#902
block: rename need_dispatch to piecemeal_dispatch in blk-mq sched#902blktests-ci[bot] wants to merge 1 commit into
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The local boolean in __blk_mq_sched_dispatch_requests() decides whether
to fall back to the per-ctx round-robin path (blk_mq_do_dispatch_ctx())
instead of the batch flush path (blk_mq_flush_busy_ctxs()). The whole
function is about dispatching anyway, so the name "need_dispatch" is
not particularly informative and can mislead readers into thinking that
a false value means "skip dispatching".
Rename it to "piecemeal_dispatch" to match the comment right above the
check ("dequeue request one by one from sw queue if queue is busy")
and to convey the actual intent: take the piecemeal, fair, one-at-a-time
path either when we just drained hctx->dispatch (so the device has
recently pushed back) or when the dispatch_busy EWMA still indicates
congestion. The fast batch path is only taken when neither signal
suggests recent backpressure.
No functional change.
Signed-off-by: Guixin Liu <kanie@linux.alibaba.com>
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Pull request for series with
subject: block: rename need_dispatch to piecemeal_dispatch in blk-mq sched
version: 2
url: https://patchwork.kernel.org/project/linux-block/list/?series=1102111