Re: [PATCH 1/1] libata: Get rid of ata_port::qc_allocated bitmask

[Alexander Gordeev]

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@xxxxxxxxxx
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/