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authorYu Kuai <yukuai3@huawei.com>2021-07-07 09:56:49 +0800
committerJens Axboe <axboe@kernel.dk>2021-07-07 09:36:36 -0600
commita731763fc479a9c64456e0643d0ccf64203100c9 (patch)
tree95e194d57e6bf16885e164006d023d1605204ab9 /block/bsg.c
parentd80c228d44640f0b47b57a2ca4afa26ef87e16b0 (diff)
blk-cgroup: prevent rcu_sched detected stalls warnings while iterating blkgs
We run a test that create millions of cgroups and blkgs, and then trigger blkg_destroy_all(). blkg_destroy_all() will hold spin lock for a long time in such situation. Thus release the lock when a batch of blkgs are destroyed. blkcg_activate_policy() and blkcg_deactivate_policy() might have the same problem, however, as they are basically only called from module init/exit paths, let's leave them alone for now. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Acked-by: Tejun Heo <tj@kernel.org> Link: https://lore.kernel.org/r/20210707015649.1929797-1-yukuai3@huawei.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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