user/sven/linux.git/include/linux/blk-cgroup.h, branch v5.9.8

writeback: remove struct bdi_writeback_congested

2020-07-08T23:05:53Z

We never set any congested bits in the group writeback instances of it. And for the simpler bdi-wide case a simple scalar field is all that that is needed. Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe

blk-cgroup: remove blkcg_bio_issue_check

2020-06-29T15:09:08Z

blkcg_bio_issue_check is a giant inline function that does three entirely different things. Factor out the blk-cgroup related bio initalization into a new helper, and the open code the sequence in the only caller, relying on the fact that all the actual functionality is stubbed out for non-cgroup builds. Acked-by: Tejun Heo Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe

blk-cgroup: move rcu locking from blkcg_bio_issue_check to blk_throtl_bio

2020-06-29T15:09:08Z

The only thing in blkcg_bio_issue_check that needs to be under rcu_read_lock is blk_throtl_bio, so move the locking there. Acked-by: Tejun Heo Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe

blk-cgroup: remove the !bio->bi_blkg check in blkcg_bio_issue_check

2020-06-29T15:09:08Z

This is purely a sanity check for grave programming errors. Remove it to simplify further work in this area. Acked-by: Tejun Heo Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe

block: move the bio cgroup associatation helpers to blk-cgroup.c

2020-06-29T15:09:08Z

Keep the cgroup code together. Acked-by: Tejun Heo Reviewed-by: Johannes Thumshirn Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe

blk-iocost: switch to fixed non-auto-decaying use_delay

2020-04-30T21:54:45Z

The use_delay mechanism was introduced by blk-iolatency to hold memory allocators accountable for the reclaim and other shared IOs they cause. The duration of the delay is dynamically balanced between iolatency increasing the value on each target miss and it auto-decaying as time passes and threads get delayed on it. While this works well for iolatency, iocost's control model isn't compatible with it. There is no repeated "violation" events which can be balanced against auto-decaying. iocost instead knows how much a given cgroup is over budget and wants to prevent that cgroup from issuing IOs while over budget. Until now, iocost has been adding the cost of force-issued IOs. However, this doesn't reflect the amount which is already over budget and is simply not enough to counter the auto-decaying allowing anon-memory leaking low priority cgroup to go over its alloted share of IOs. As auto-decaying doesn't make much sense for iocost, this patch introduces a different mode of operation for use_delay - when blkcg_set_delay() are used insted of blkcg_add/use_delay(), the delay duration is not auto-decayed until it is explicitly cleared with blkcg_clear_delay(). iocost is updated to keep the delay duration synchronized to the budget overage amount. With this change, iocost can effectively police cgroups which generate significant amount of force-issued IOs. Signed-off-by: Tejun Heo Cc: Josef Bacik Signed-off-by: Jens Axboe

block: replace BIO_QUEUE_ENTERED with BIO_CGROUP_ACCT

2020-04-29T15:33:26Z

BIO_QUEUE_ENTERED is only used for cgroup accounting now, so rename the flag and move setting it into the cgroup code. Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe

blkcg: don't offline parent blkcg first

2020-04-01T20:56:44Z

blkcg->cgwb_refcnt is used to delay blkcg offlining so that blkgs don't get offlined while there are active cgwbs on them. However, it ends up making offlining unordered sometimes causing parents to be offlined before children. Let's fix this by making child blkcgs pin the parents' online states. Note that pin/unpin names are chosen over get/put intentionally because css uses get/put online for something different. Signed-off-by: Tejun Heo Signed-off-by: Jens Axboe

blkcg: rename blkcg->cgwb_refcnt to ->online_pin and always use it

2020-04-01T20:56:42Z

blkcg->cgwb_refcnt is used to delay blkcg offlining so that blkgs don't get offlined while there are active cgwbs on them. However, it ends up making offlining unordered sometimes causing parents to be offlined before children. To fix it, we want child blkcgs to pin the parents' online states turning the refcnt into a more generic online pinning mechanism. In prepartion, * blkcg->cgwb_refcnt -> blkcg->online_pin * blkcg_cgwb_get/put() -> blkcg_pin/unpin_online() * Take them out of CONFIG_CGROUP_WRITEBACK Signed-off-by: Tejun Heo Signed-off-by: Jens Axboe

blk-cgroup: remove blkcg_drain_queue

2019-12-12T16:26:55Z

Since blk_drain_queue had already been removed, so this function is not needed anymore. Signed-off-by: Guoqing Jiang Signed-off-by: Jens Axboe