Messages in this thread | | | Date | Fri, 28 Oct 2016 15:12:32 -0400 | From | Tejun Heo <> | Subject | Re: [PATCH 1/4] sched: move IO scheduling accounting from io_schedule_timeout() to __schedule() |
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Hello, Peter.
On Fri, Oct 28, 2016 at 09:07:02PM +0200, Peter Zijlstra wrote: > One alternative is to inherit the iowait state of the task we block on. > That'll not get rid of the branches much, but it will remove the new > mutex APIs.
Yeah, thought about that briefly but we don't necessarily track mutex or other synchronization construct owners, things get gnarly with rwsems (the inode ones sometimes end up in a similar situation), and we'll probably end up dealing with some surprising propagations down the line. That said, getting such automatic propagation working would be great.
Thanks.
-- tejun
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