Re: [PATCH V4] block: optimize for small block size IO

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On Sat, Nov 02, 2019 at 03:29:11PM +0800, Ming Lei wrote:
> __blk_queue_split() may be a bit heavy for small block size(such as
> 512B, or 4KB) IO, so introduce one flag to decide if this bio includes
> multiple page. And only consider to try splitting this bio in case
> that the multiple page flag is set.

So, back in the day I had an alternative approach in mind: get rid of
blk_queue_split entirely, by pushing splitting down to the request layer - when
we map the bio/request to sgl, just have it map as much as will fit in the sgl
and if it doesn't entirely fit bump bi_remaining and leave it on the request
queue.

This would mean there'd be no need for counting segments at all, and would cut a
fair amount of code out of the io path.



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