Re: [PATCH V7 0/2] percpu_ref & block: reduce memory footprint of percpu_ref in fast path

Ming Lei
2020-10-06T07:41:22Z

On Thu, Oct 01, 2020 at 11:48:40PM +0800, Ming Lei wrote:
> Hi,
>
> The 1st patch removes memory footprint of percpu_ref in fast path
> from 7 words to 2 words, since it is often used in fast path and
> embedded in user struct.
>
> The 2nd patch moves .q_usage_counter to 1st cacheline of
> 'request_queue'.
>
> Simple test on null_blk shows ~2% IOPS boost on one 16cores(two threads
> per core) machine, dual socket/numa.
>
> V7:
> - add comments about reason for struct split

Hello Jens

Can you consider to merge the patchset in block tree if you are fine?

Thanks,
Ming