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SubjectRe: [PATCH 1/1] libata: Get rid of ata_port::qc_allocated bitmask
On Tue, Jan 21, 2014 at 04:02:26PM +0100, Alexander Gordeev wrote:
> Scanning ata_port::qc_allocated bitmask for free tags has
> been a performance bottleneck due to the cache line bouncing.
> This update replaces ata_port::qc_allocated bitmask with
> optimized for parallel access percpu_ida tags allocator.

Hi Tejun,

There is a discussion about imperfect percpu_ida handling of low nr of tags.
I think this change is too early to bring.

Thanks!

--
Regards,
Alexander Gordeev
agordeev@redhat.com


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