Re: [PATCH 2/3] block: kill QUEUE_FLAG_NO_SG_MERGE

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To: Ming Lei <ming.lei@xxxxxxxxxx>
Subject: Re: [PATCH 2/3] block: kill QUEUE_FLAG_NO_SG_MERGE
From: Christoph Hellwig <hch@xxxxxx>
Date: Wed, 1 Aug 2018 16:54:02 +0200
Cc: Jens Axboe <axboe@xxxxxxxxx>, linux-block@xxxxxxxxxxxxxxx, Christoph Hellwig <hch@xxxxxx>, Mike Snitzer <snitzer@xxxxxxxxxx>, Kent Overstreet <kent.overstreet@xxxxxxxxx>
In-reply-to: <20180731104914.17249-3-ming.lei@redhat.com>
References: <20180731104914.17249-1-ming.lei@redhat.com> <20180731104914.17249-3-ming.lei@redhat.com>
User-agent: Mutt/1.5.17 (2007-11-01)

We still hit __blk_recalc_rq_segments at least once per submission,
don't we?  Either rather wait with this until we have multi-page bvecs.

Follow-Ups:
- Re: [PATCH 2/3] block: kill QUEUE_FLAG_NO_SG_MERGE
  - From: Ming Lei

References:
- [PATCH 0/3] block: fix mismatch of figuring out physical segment number
  - From: Ming Lei
- [PATCH 2/3] block: kill QUEUE_FLAG_NO_SG_MERGE
  - From: Ming Lei

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