linux-kernel - [PATCH 0/2] blk-throttle: improve bypassing bios checkings

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Message-Id: <20220921095309.1481289-1-yukuai1@huaweicloud.com>
Date:   Wed, 21 Sep 2022 17:53:07 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     tj@...nel.org, axboe@...nel.dk
Cc:     cgroups@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, yukuai3@...wei.com,
        yukuai1@...weicloud.com, yi.zhang@...wei.com
Subject: [PATCH 0/2] blk-throttle: improve bypassing bios checkings

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

Currently, "tg->has_rules" and "tg->flags & THROTL_TG_HAS_IOPS_LIMIT"
both try to bypass bios that don't need to be throttled, however, they are
a little redundant and both not perfect:

1) "tg->has_rules" only distinguish read and write, but not iops and bps
   limit.
2) "tg->flags & THROTL_TG_HAS_IOPS_LIMIT" only check if iops limit
   exist, read and write is not distinguished, and bps limit is not
   checked.

With this patchset, biowon't be bypassedd if:

1) Bio is read/write, and corresponding read/write iops limit exist.
2) If corresponding iops limit doesn't exist, corresponding bps limit
exist and bio is not throttled before.

Yu Kuai (2):
  blk-throttle: remove THROTL_TG_HAS_IOPS_LIMIT
  blk-throttle: improve bypassing bios checkings

 block/blk-throttle.c | 21 +++++++--------------
 block/blk-throttle.h | 28 +++++++++++++++++++---------
 2 files changed, 26 insertions(+), 23 deletions(-)

-- 
2.31.1