Re: [PATCH] block: optimize for small BS IO

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On Tue, Oct 29, 2019 at 12:19:04PM +0800, Ming Lei wrote:
> @@ -309,6 +309,10 @@ void __blk_queue_split(struct request_queue *q, struct bio **bio,
>  				nr_segs);
>  		break;
>  	default:
> +		if (!bio_flagged(*bio, BIO_MULTI_PAGE)) {
> +			*nr_segs = 1;
> +			return;
> +		}
>  		split = blk_bio_segment_split(q, *bio, &q->bio_split, nr_segs);
>  		break;
>  	}

Is there anything to gain by clearing this new flag if the result of
blk_bio_segment_split() creates single page bio's?



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