Messages in this thread | | | Date | Tue, 23 Sep 2014 08:09:06 +0200 | From | Christoph Hellwig <> | Subject | Re: boot stall regression due to blk-mq: use percpu_ref for mq usage count |
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On Tue, Sep 23, 2014 at 02:01:41AM -0400, Tejun Heo wrote: > On Tue, Sep 23, 2014 at 07:59:24AM +0200, Christoph Hellwig wrote: > > "[PATCHSET percpu/for-3.18] percpu_ref: implement switch_to_atomic/percpu()" > > > > looks way to big for 3.17, and the regression was introduced in the 3.17 > > merge window. I'm not sure what was broken before, but it defintively > > survived a lot of testing. > > Do we even care about fixing it for 3.17? scsi-mq isn't enabled by > default even for 3.18. The open-coded percpu ref thing was subtly > broken there. It'd be difficult to trigger but I'm fairly sure it'd > crap out in the wild once in a blue moon.
It's compiled in by default, and people are extremly eager to test it.
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