On 05/06/2020 12:44, Ming Lei wrote:
Hi Jens,
The 1st patch avoids to fail driver tag allocation because of inactive
hctx, so hang risk can be killed during cpu hotplug.
The 2nd patch fixes blk_mq_all_tag_iter so that we can drain all
requests before one hctx becomes inactive.
Both fixes bf0beec0607d ("blk-mq: drain I/O when all CPUs in a hctx are
offline").
John has verified that the two can fix his request timeout issue during
cpu hotplug.
But let me test it again my afternoon. My test branch earlier had some
debug stuff.
Cheers
Christoph Hellwig (1):
blk-mq: split out a __blk_mq_get_driver_tag helper
Ming Lei (1):
blk-mq: fix blk_mq_all_tag_iter
block/blk-mq-tag.c | 39 ++++++++++++++++++++++++++++++++++++---
block/blk-mq-tag.h | 8 ++++++++
block/blk-mq.c | 29 -----------------------------
block/blk-mq.h | 1 -
4 files changed, 44 insertions(+), 33 deletions(-)
Cc: Dongli Zhang <dongli.zhang@xxxxxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxx>
Cc: Daniel Wagner <dwagner@xxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: John Garry <john.garry@xxxxxxxxxx>
