From: Roger Pau Monne <roger.pau@citrix.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Jens Axboe <axboe@kernel.dk>, NeilBrown <neilb@suse.com>,
linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
xen-devel@lists.xenproject.org
Subject: Re: [PATCH 08/11] xen-blkfront: remove bio splitting.
Date: Fri, 21 Apr 2017 12:46:22 +0100 [thread overview]
Message-ID: <20170421114622.ymoprc7a4h3g6xqi__28687.6994338401$1492775254$gmane$org@dhcp-3-128.uk.xensource.com> (raw)
In-Reply-To: <20170421113620.GK12523@infradead.org>
On Fri, Apr 21, 2017 at 04:36:20AM -0700, Christoph Hellwig wrote:
> Btw, I really don't understand why this code even looks at bios over
> just requeueing the request. Can someone explain that bit to me?
This was done because Linux could migrate from a host supporting indirect
descriptors to a host not supporting them, and so the maximum number of
segments per request could change, and the requests already on the queue might
need to be split.
Roger.
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next prev parent reply other threads:[~2017-04-21 11:46 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-20 5:38 [PATCH 00/10] block: assorted cleanup for bio splitting and cloning NeilBrown
2017-04-20 5:38 ` NeilBrown
2017-04-20 5:38 ` [PATCH 00/11] " NeilBrown
2017-04-20 5:38 ` [PATCH 01/11] blk: remove bio_set arg from blk_queue_split() NeilBrown
2017-04-21 11:21 ` Christoph Hellwig
2017-04-21 15:14 ` Ming Lei
2017-04-22 9:16 ` Javier González
2017-04-24 2:32 ` NeilBrown
2017-04-20 5:38 ` [PATCH 02/11] blk: make the bioset rescue_workqueue optional NeilBrown
2017-04-21 11:24 ` Christoph Hellwig
2017-04-24 1:51 ` NeilBrown
2017-04-24 15:10 ` Christoph Hellwig
2017-05-01 5:00 ` NeilBrown
2017-05-01 14:02 ` Jens Axboe
2017-05-02 3:33 ` NeilBrown
2017-04-20 5:38 ` [PATCH 07/11] pktcdvd: use bio_clone_fast() instead of bio_clone() NeilBrown
2017-04-21 11:29 ` Christoph Hellwig
2017-04-20 5:38 ` [PATCH 05/11] rbd: " NeilBrown
2017-04-20 5:38 ` NeilBrown
2017-04-21 11:31 ` Christoph Hellwig
2017-04-20 5:38 ` [PATCH 03/11] blk: use non-rescuing bioset for q->bio_split NeilBrown
2017-04-21 11:25 ` Christoph Hellwig
2017-04-20 5:38 ` [PATCH 04/11] block: Improvements to bounce-buffer handling NeilBrown
2017-04-21 11:28 ` Christoph Hellwig
2017-04-21 15:39 ` Ming Lei
2017-04-20 5:38 ` [PATCH 06/11] drbd: use bio_clone_fast() instead of bio_clone() NeilBrown
2017-04-21 11:30 ` Christoph Hellwig
2017-04-20 5:38 ` [PATCH 09/11] bcache: use kmalloc to allocate bio in bch_data_verify() NeilBrown
2017-04-20 5:38 ` NeilBrown
2017-04-21 11:31 ` Christoph Hellwig
2017-04-21 11:32 ` Kent Overstreet
2017-04-21 15:41 ` Ming Lei
2017-04-20 5:38 ` [PATCH 08/11] xen-blkfront: remove bio splitting NeilBrown
2017-04-20 5:38 ` NeilBrown
2017-04-20 5:38 ` NeilBrown
2017-04-20 10:00 ` Roger Pau Monné
2017-04-20 10:00 ` Roger Pau Monné
2017-04-20 10:00 ` Roger Pau Monné
2017-04-21 11:36 ` Christoph Hellwig
2017-04-21 11:36 ` Christoph Hellwig
2017-04-21 11:46 ` Roger Pau Monne [this message]
2017-04-21 11:46 ` Roger Pau Monne
2017-04-20 5:38 ` [PATCH 11/11] block: don't check for BIO_MAX_PAGES in blk_bio_segment_split() NeilBrown
2017-04-21 11:34 ` Christoph Hellwig
2017-04-21 15:48 ` Ming Lei
2017-04-24 3:16 ` NeilBrown
2017-04-24 3:14 ` NeilBrown
2017-04-20 5:38 ` [PATCH 10/11] block: remove bio_clone() and all references NeilBrown
2017-04-21 11:32 ` Christoph Hellwig
2017-04-21 15:43 ` Ming Lei
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