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| author | Tejun Heo <tj@kernel.org> | 2020-09-01 14:52:42 -0400 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-09-01 19:38:32 -0600 |
| commit | da437b95db83106319d337a5859e6dfb464b085a (patch) | |
| tree | 9bc64072204d09302f96aa71d088a4f5646c1eee /kernel | |
| parent | 7ca5b2e60bfa4aa5b8d52e9c3e2a757c581bec1d (diff) | |
| download | linux-da437b95db83106319d337a5859e6dfb464b085a.tar.bz2 | |
blk-iocost: grab ioc->lock for debt handling
Currently, debt handling requires only iocg->waitq.lock. In the future, we
want to adjust and propagate inuse changes depending on debt status. Let's
grab ioc->lock in debt handling paths in preparation.
* Because ioc->lock nests outside iocg->waitq.lock, the decision to grab
ioc->lock needs to be made before entering the critical sections.
* Add and use iocg_[un]lock() which handles the conditional double locking.
* Add @pay_debt to iocg_kick_waitq() so that debt payment happens only when
the caller grabbed both locks.
This patch is prepatory and the comments contain references to future
changes.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions