From: Dan Williams <dan.j.williams@intel.com>
To: Christoph Hellwig <hch@lst.de>
Cc: Jens Axboe <axboe@kernel.dk>, Jim Paris <jim@jtan.com>,
Geoff Levand <geoff@infradead.org>,
Joshua Morris <josh.h.morris@us.ibm.com>,
Philip Kelleher <pjk1939@linux.ibm.com>,
Minchan Kim <minchan@kernel.org>, Nitin Gupta <ngupta@vflare.org>,
Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
linux-m68k@lists.linux-m68k.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-xtensa@linux-xtensa.org, drbd-dev@lists.linbit.com,
linux-block@vger.kernel.org,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
linux-bcache@vger.kernel.org,
linux-raid <linux-raid@vger.kernel.org>,
linux-nvdimm <linux-nvdimm@lists.01.org>
Subject: Re: remove a few uses of ->queuedata
Date: Sat, 9 May 2020 08:07:14 -0700 [thread overview]
Message-ID: <CAPcyv4ggb7_rwzGbhHNXSHd+jjSpZC=+DMEztY6Cu8Bc=ZNzag@mail.gmail.com> (raw)
In-Reply-To: <20200509082352.GB21834@lst.de>
On Sat, May 9, 2020 at 1:24 AM Christoph Hellwig <hch@lst.de> wrote:
>
> On Fri, May 08, 2020 at 11:04:45AM -0700, Dan Williams wrote:
> > On Fri, May 8, 2020 at 9:16 AM Christoph Hellwig <hch@lst.de> wrote:
> > >
> > > Hi all,
> > >
> > > various bio based drivers use queue->queuedata despite already having
> > > set up disk->private_data, which can be used just as easily. This
> > > series cleans them up to only use a single private data pointer.
> >
> > ...but isn't the queue pretty much guaranteed to be cache hot and the
> > gendisk cache cold? I'm not immediately seeing what else needs the
> > gendisk in the I/O path. Is there another motivation I'm missing?
>
> ->private_data is right next to the ->queue pointer, pat0 and part_tbl
> which are all used in the I/O submission path (generic_make_request /
> generic_make_request_checks). This is mostly a prep cleanup patch to
> also remove the pointless queue argument from ->make_request - then
> ->queue is an extra dereference and extra churn.
Ah ok. If the changelogs had been filled in with something like "In
preparation for removing @q from make_request_fn, stop using
->queuedata", I probably wouldn't have looked twice.
For the nvdimm/ driver updates you can add:
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
...or just let me know if you want me to pick those up through the nvdimm tree.
next prev parent reply other threads:[~2020-05-09 15:07 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-08 16:15 remove a few uses of ->queuedata Christoph Hellwig
2020-05-08 16:15 ` [PATCH 01/15] nfblock: use gendisk private_data Christoph Hellwig
2020-05-09 10:38 ` Geert Uytterhoeven
2020-05-08 16:15 ` [PATCH 02/15] simdisk: stop using ->queuedata Christoph Hellwig
2020-05-08 16:15 ` [PATCH 03/15] drbd: " Christoph Hellwig
2020-05-08 16:15 ` [PATCH 04/15] null_blk: stop using ->queuedata for bio mode Christoph Hellwig
2020-05-08 16:15 ` [PATCH 05/15] ps3vram: stop using ->queuedata Christoph Hellwig
2020-05-08 16:15 ` [PATCH 06/15] rsxx: " Christoph Hellwig
2020-05-08 16:15 ` [PATCH 07/15] umem: " Christoph Hellwig
2020-05-08 16:15 ` [PATCH 08/15] zram: " Christoph Hellwig
2020-05-08 16:15 ` [PATCH 09/15] lightnvm: " Christoph Hellwig
2020-05-09 8:38 ` [PATCH 09/15, fіxed] " Christoph Hellwig
2020-05-08 16:15 ` [PATCH 10/15] bcache: stop setting ->queuedata Christoph Hellwig
2020-05-08 16:15 ` [PATCH 11/15] dm: stop using ->queuedata Christoph Hellwig
2020-05-08 16:15 ` [PATCH 12/15] md: " Christoph Hellwig
2020-05-13 18:29 ` Song Liu
2020-05-13 18:33 ` Christoph Hellwig
2020-05-13 18:45 ` Song Liu
2020-05-08 16:15 ` [PATCH 13/15] nvdimm/blk: " Christoph Hellwig
2020-05-08 16:15 ` [PATCH 14/15] nvdimm/btt: " Christoph Hellwig
2020-05-08 16:15 ` [PATCH 15/15] nvdimm/pmem: " Christoph Hellwig
2020-05-08 18:04 ` remove a few uses of ->queuedata Dan Williams
2020-05-09 8:23 ` Christoph Hellwig
2020-05-09 15:07 ` Dan Williams [this message]
2020-05-12 8:08 ` Christoph Hellwig
2020-05-13 22:26 ` Dan Williams
2020-05-08 22:13 ` Ming Lei
2020-05-09 8:24 ` Christoph Hellwig
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