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Re: [PATCH 0/2] blk-mq: support physical CPU hotplug




I think we also need cc stable for this. The bug was introduced with 
 
commit 4b855ad37194f7bdbb200ce7a1c7051fecb56a08 upstream.
("blk-mq: Create hctx for each present CPU")

and that was even backported into 4.12 stable.



On 01/12/2018 03:53 AM, Ming Lei wrote:
> Hi,
> 
> This two patches support physical CPU hotplug, so that we can make blk-mq
> scale well when new physical CPU is added or removed, and this use case
> is normal for VM world.
> 
> Also this patchset fixes the following warning reported by Christian
> Borntraeger:
> 
> 	https://marc.info/?l=linux-block&m=151092973417143&w=2
> 
> Christoph Hellwig (2):
>   genirq/affinity: assign vectors to all possible CPUs
>   blk-mq: simplify queue mapping & schedule with each possisble CPU
> 
>  block/blk-mq.c        | 19 ++++++++-----------
>  kernel/irq/affinity.c | 30 +++++++++++++++---------------
>  2 files changed, 23 insertions(+), 26 deletions(-)
>