[PATCH 0/5 v2] writeback: Fix bandwidth estimates

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Hello,

Here is a second revision of the patch series to fix estimate of writeback
throughput when device is not fully busy doing writeback. Michael Stapelberg
has reported that such workload (e.g. generated by linking) tends to push
estimated throughput down to 0 and as a result writeback on the device is
practically stalled.

The first three patches fix the reported issue, the remaining two patches
are unrelated cleanups of problems I've noticed when reading the code.

Andrew, can you please pick up the series? Thanks!

								Honza
Changes since v1:
* Added comments to better explain the logic
* Added Tested-by tag


Previous versions:
Link: http://lore.kernel.org/r/20210705161610.19406-1-jack@xxxxxxx # v1




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