From: Christoph Hellwig <hch@lst.de>
To: Mike Snitzer <snitzer@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, Sagi Grimberg <sagi@grimberg.me>,
linux-nvme@lists.infradead.org,
Keith Busch <keith.busch@intel.com>,
Hannes Reinecke <hare@suse.de>,
Johannes Thumshirn <jthumshirn@suse.de>
Subject: Re: [PATCH 06/17] block: introduce GENHD_FL_HIDDEN
Date: Sat, 28 Oct 2017 08:38:25 +0200 [thread overview]
Message-ID: <20171028063825.GA14261@lst.de> (raw)
In-Reply-To: <20171024213959.GB23307@redhat.com>
On Tue, Oct 24, 2017 at 05:40:00PM -0400, Mike Snitzer wrote:
> Having the NVme driver go to such lengths to hide its resources from
> upper layers is certainly the work of an evil genius experiencing some
> serious territorial issues. Not sugar-coating it.. you wouldn't.
I'm pretty surre Hannes will appreciate being called an evil genius :)
> I kept meaning to reply to your earlier iterations on this series to
> ask: can we please get a CONFIG_NVME_MULTIPATHING knob to make it so
> that the NVMe driver doesn't implicitly consume (and hide) all
> per-controler devices?
I thought about adding it, but mostly for a different reason: it's
quite a bit of code, and we now start to see NVMe in deeply embedded
contexts, e.g. the latest Compact Flash spec is based on NVMe, so it
might be a good idea to give people a chance to avoid the overhead.
> Ah well. There is only one correct way to do NVMe multipathing after
> all right?
I don't think you'll get very useful results, even if you try. But I
guess we'll just have to tell people to use SuSE if they want NVMe
multipathing to work then :)
WARNING: multiple messages have this Message-ID (diff)
From: hch@lst.de (Christoph Hellwig)
Subject: [PATCH 06/17] block: introduce GENHD_FL_HIDDEN
Date: Sat, 28 Oct 2017 08:38:25 +0200 [thread overview]
Message-ID: <20171028063825.GA14261@lst.de> (raw)
In-Reply-To: <20171024213959.GB23307@redhat.com>
On Tue, Oct 24, 2017@05:40:00PM -0400, Mike Snitzer wrote:
> Having the NVme driver go to such lengths to hide its resources from
> upper layers is certainly the work of an evil genius experiencing some
> serious territorial issues. Not sugar-coating it.. you wouldn't.
I'm pretty surre Hannes will appreciate being called an evil genius :)
> I kept meaning to reply to your earlier iterations on this series to
> ask: can we please get a CONFIG_NVME_MULTIPATHING knob to make it so
> that the NVMe driver doesn't implicitly consume (and hide) all
> per-controler devices?
I thought about adding it, but mostly for a different reason: it's
quite a bit of code, and we now start to see NVMe in deeply embedded
contexts, e.g. the latest Compact Flash spec is based on NVMe, so it
might be a good idea to give people a chance to avoid the overhead.
> Ah well. There is only one correct way to do NVMe multipathing after
> all right?
I don't think you'll get very useful results, even if you try. But I
guess we'll just have to tell people to use SuSE if they want NVMe
multipathing to work then :)
next prev parent reply other threads:[~2017-10-28 6:38 UTC|newest]
Thread overview: 116+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-23 14:51 nvme multipath support V5 Christoph Hellwig
2017-10-23 14:51 ` Christoph Hellwig
2017-10-23 14:51 ` [PATCH 01/17] block: move REQ_NOWAIT Christoph Hellwig
2017-10-23 14:51 ` Christoph Hellwig
2017-10-23 14:51 ` [PATCH 02/17] block: add REQ_DRV bit Christoph Hellwig
2017-10-23 14:51 ` Christoph Hellwig
2017-10-23 14:51 ` [PATCH 03/17] block: provide a direct_make_request helper Christoph Hellwig
2017-10-23 14:51 ` Christoph Hellwig
2017-10-24 7:05 ` Hannes Reinecke
2017-10-24 7:05 ` Hannes Reinecke
2017-10-24 17:57 ` Javier González
2017-10-24 17:57 ` Javier González
2017-10-23 14:51 ` [PATCH 04/17] block: add a blk_steal_bios helper Christoph Hellwig
2017-10-23 14:51 ` Christoph Hellwig
2017-10-24 7:07 ` Hannes Reinecke
2017-10-24 7:07 ` Hannes Reinecke
2017-10-24 8:44 ` Max Gurtovoy
2017-10-24 8:44 ` Max Gurtovoy
2017-10-28 6:13 ` Christoph Hellwig
2017-10-28 6:13 ` Christoph Hellwig
2017-10-23 14:51 ` [PATCH 05/17] block: don't look at the struct device dev_t in disk_devt Christoph Hellwig
2017-10-23 14:51 ` Christoph Hellwig
2017-10-24 7:08 ` Hannes Reinecke
2017-10-24 7:08 ` Hannes Reinecke
2017-10-23 14:51 ` [PATCH 06/17] block: introduce GENHD_FL_HIDDEN Christoph Hellwig
2017-10-23 14:51 ` Christoph Hellwig
2017-10-24 7:18 ` Hannes Reinecke
2017-10-24 7:18 ` Hannes Reinecke
2017-10-28 6:15 ` Christoph Hellwig
2017-10-28 6:15 ` Christoph Hellwig
2017-10-24 21:40 ` Mike Snitzer
2017-10-24 21:40 ` Mike Snitzer
2017-10-28 6:38 ` Christoph Hellwig [this message]
2017-10-28 6:38 ` Christoph Hellwig
2017-10-28 7:20 ` Guan Junxiong
2017-10-28 7:20 ` Guan Junxiong
2017-10-28 7:42 ` Christoph Hellwig
2017-10-28 7:42 ` Christoph Hellwig
2017-10-28 10:09 ` Guan Junxiong
2017-10-28 10:09 ` Guan Junxiong
2017-10-29 8:00 ` Anish Jhaveri
2017-10-29 8:00 ` Anish Jhaveri
2017-10-29 8:57 ` Christoph Hellwig
2017-10-29 8:57 ` Christoph Hellwig
2017-10-28 14:17 ` Mike Snitzer
2017-10-28 14:17 ` Mike Snitzer
2017-10-29 10:01 ` Hannes Reinecke
2017-10-29 10:01 ` Hannes Reinecke
2017-10-30 4:09 ` Guan Junxiong
2017-10-30 4:09 ` Guan Junxiong
2017-10-23 14:51 ` [PATCH 07/17] block: add a poll_fn callback to struct request_queue Christoph Hellwig
2017-10-23 14:51 ` Christoph Hellwig
2017-10-24 7:20 ` Hannes Reinecke
2017-10-24 7:20 ` Hannes Reinecke
2017-10-23 14:51 ` [PATCH 08/17] nvme: use kref_get_unless_zero in nvme_find_get_ns Christoph Hellwig
2017-10-23 14:51 ` Christoph Hellwig
2017-10-24 7:21 ` Hannes Reinecke
2017-10-24 7:21 ` Hannes Reinecke
2017-10-23 14:51 ` [PATCH 09/17] nvme: simplify nvme_open Christoph Hellwig
2017-10-23 14:51 ` Christoph Hellwig
2017-10-24 7:21 ` Hannes Reinecke
2017-10-24 7:21 ` Hannes Reinecke
2017-10-23 14:51 ` [PATCH 10/17] nvme: switch controller refcounting to use struct device Christoph Hellwig
2017-10-23 14:51 ` Christoph Hellwig
2017-10-24 7:23 ` Hannes Reinecke
2017-10-24 7:23 ` Hannes Reinecke
2017-10-23 14:51 ` [PATCH 11/17] nvme: get rid of nvme_ctrl_list Christoph Hellwig
2017-10-23 14:51 ` Christoph Hellwig
2017-10-24 7:24 ` Hannes Reinecke
2017-10-24 7:24 ` Hannes Reinecke
2017-10-23 14:51 ` [PATCH 12/17] nvme: check for a live controller in nvme_dev_open Christoph Hellwig
2017-10-23 14:51 ` Christoph Hellwig
2017-10-24 7:25 ` Hannes Reinecke
2017-10-24 7:25 ` Hannes Reinecke
2017-10-23 14:51 ` [PATCH 13/17] nvme: track subsystems Christoph Hellwig
2017-10-23 14:51 ` Christoph Hellwig
2017-10-24 7:33 ` Hannes Reinecke
2017-10-24 7:33 ` Hannes Reinecke
2017-10-23 14:51 ` [PATCH 14/17] nvme: introduce a nvme_ns_ids structure Christoph Hellwig
2017-10-23 14:51 ` Christoph Hellwig
2017-10-24 7:27 ` Hannes Reinecke
2017-10-24 7:27 ` Hannes Reinecke
2017-10-23 14:51 ` [PATCH 15/17] nvme: track shared namespaces Christoph Hellwig
2017-10-23 14:51 ` Christoph Hellwig
2017-10-24 7:34 ` Hannes Reinecke
2017-10-24 7:34 ` Hannes Reinecke
2017-10-23 14:51 ` [PATCH 16/17] nvme: implement multipath access to nvme subsystems Christoph Hellwig
2017-10-23 14:51 ` Christoph Hellwig
2017-10-23 15:32 ` Sagi Grimberg
2017-10-23 15:32 ` Sagi Grimberg
2017-10-23 16:57 ` Christoph Hellwig
2017-10-23 16:57 ` Christoph Hellwig
2017-10-23 17:43 ` Sagi Grimberg
2017-10-23 17:43 ` Sagi Grimberg
2017-10-24 7:43 ` Hannes Reinecke
2017-10-24 7:43 ` Hannes Reinecke
2017-10-28 6:32 ` Christoph Hellwig
2017-10-28 6:32 ` Christoph Hellwig
2017-10-30 3:37 ` Guan Junxiong
2017-10-30 3:37 ` Guan Junxiong
2017-11-02 18:22 ` Christoph Hellwig
2017-11-02 18:22 ` Christoph Hellwig
2017-10-23 14:51 ` [PATCH 17/17] nvme: also expose the namespace identification sysfs files for mpath nodes Christoph Hellwig
2017-10-23 14:51 ` Christoph Hellwig
2017-10-24 7:45 ` Hannes Reinecke
2017-10-24 7:45 ` Hannes Reinecke
2017-10-28 6:20 ` Christoph Hellwig
2017-10-28 6:20 ` Christoph Hellwig
-- strict thread matches above, loose matches on Subject: below --
2017-10-18 16:52 nvme multipath support V4 Christoph Hellwig
2017-10-18 16:52 ` [PATCH 06/17] block: introduce GENHD_FL_HIDDEN Christoph Hellwig
2017-10-18 16:52 ` Christoph Hellwig
2017-10-19 8:31 ` Johannes Thumshirn
2017-10-19 8:31 ` Johannes Thumshirn
2017-10-19 12:45 ` Hannes Reinecke
2017-10-19 12:45 ` Hannes Reinecke
2017-10-19 13:15 ` Christoph Hellwig
2017-10-19 13:15 ` Christoph Hellwig
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