linux-kernel - [PATCH v9 0/4] blk-throttle bugfix

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Date:   Mon, 29 Aug 2022 10:22:36 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     axboe@...nel.dk, tj@...nel.org, mkoutny@...e.com,
        ming.lei@...hat.com
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org, yukuai3@...wei.com,
        yukuai1@...weicloud.com, yi.zhang@...wei.com
Subject: [PATCH v9 0/4] blk-throttle bugfix

From: Yu Kuai <yukuai3@...wei.com>

Changes in v9:
 - renaming the flag BIO_THROTTLED to BIO_BPS_THROTTLED, and always
 apply iops limit in path 1;
 - add tag for patch 4
Changes in v8:
 - use a new solution in patch 1
 - move cleanups to a separate patchset
 - rename bytes/io_skipped to carryover_bytes/ios in patch 4
Changes in v7:
 - add patch 5 to improve handling of re-entered bio for bps limit
 - as suggested by Tejun, add some comments
 - sdd some Acked tag by Tejun
Changes in v6:
 - rename parameter in patch 3
 - add comments and reviewed tag for patch 4
Changes in v5:
 - add comments in patch 4
 - clear bytes/io_skipped in throtl_start_new_slice_with_credit() in
 patch 4
 - and cleanup patches 5-8
Changes in v4:
 - add reviewed-by tag for patch 1
 - add patch 2,3
 - use a different way to fix io hung in patch 4
Changes in v3:
 - fix a check in patch 1
 - fix link err in patch 2 on 32-bit platform
 - handle overflow in patch 2
Changes in v2:
 - use a new solution suggested by Ming
 - change the title of patch 1
 - add patch 2

Patch 1 fix that blk-throttle can't work if multiple bios are throttle.
Patch 2 fix overflow while calculating wait time.
Patch 3,4 fix io hung due to configuration updates.

Previous version:
v1: https://lore.kernel.org/all/20220517134909.2910251-1-yukuai3@huawei.com/
v2: https://lore.kernel.org/all/20220518072751.1188163-1-yukuai3@huawei.com/
v3: https://lore.kernel.org/all/20220519085811.879097-1-yukuai3@huawei.com/
v4: https://lore.kernel.org/all/20220523082633.2324980-1-yukuai3@huawei.com/
v5: https://lore.kernel.org/all/20220528064330.3471000-1-yukuai3@huawei.com/
v6: https://lore.kernel.org/all/20220701093441.885741-1-yukuai1@huaweicloud.com/
v7: https://lore.kernel.org/all/20220802140415.2960284-1-yukuai1@huaweicloud.com/
v8: https://lore.kernel.org/all/20220823033130.874230-1-yukuai1@huaweicloud.com/

Yu Kuai (4):
  blk-throttle: fix that io throttle can only work for single bio
  blk-throttle: prevent overflow while calculating wait time
  blk-throttle: factor out code to calculate ios/bytes_allowed
  blk-throttle: fix io hung due to configuration updates

 block/bio.c               |   2 -
 block/blk-throttle.c      | 137 +++++++++++++++++++++++++-------------
 block/blk-throttle.h      |  11 ++-
 include/linux/bio.h       |   2 +-
 include/linux/blk_types.h |   2 +-
 5 files changed, 104 insertions(+), 50 deletions(-)

-- 
2.31.1