Re: [Xen-devel] [PATCH V2 00/10] block: enable multi-page bvec for passthrough IO

[Jens Axboe <axboe@xxxxxxxxx>]

On 3/17/19 4:01 AM, Ming Lei wrote:
> Hi,
> 
> Now the whole IO stack is capable of handling multi-page bvec, and it has
> been enabled in the normal FS IO path. However, it isn't done for
> passthrough IO.
> 
> Without enabling multi-bvec for passthough IO, we won't go ahead for
> optimizing related IO paths, such as bvec merging, bio_add_pc_page
> simplification.
> 
> This patch enables multi-page bvec for passthrough IO. Turns out
> bio_add_pc_page() is simpliefied a lot, especially the physical segment
> number of passthrough bio is always same with bio.bi_vcnt. Also the
> bvec merging inside bio is killed.
> 
> blktests(block/029) is added for covering passthough IO path, and this
> patchset does pass the new block/029 test.
> 
>       https://marc.info/?l=linux-block&m=155175063417139&w=2

Merged for 5.2, thanks Ming.

-- 
Jens Axboe


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