From: Matthew Wilcox <willy@infradead.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
linux-block@vger.kernel.org,
"Darrick J . Wong" <djwong@kernel.org>
Subject: Re: [PATCH v15 08/17] iomap: Pass the iomap_page into iomap_set_range_uptodate
Date: Tue, 20 Jul 2021 12:36:57 +0100 [thread overview]
Message-ID: <YPa1WT21+gi2hZT0@casper.infradead.org> (raw)
In-Reply-To: <YPZzwkcNP0NQEv6+@infradead.org>
On Tue, Jul 20, 2021 at 08:57:06AM +0200, Christoph Hellwig wrote:
> On Mon, Jul 19, 2021 at 07:39:52PM +0100, Matthew Wilcox (Oracle) wrote:
> > All but one caller already has the iomap_page, and we can avoid getting
> > it again.
> >
> > Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
> > Reviewed-by: Darrick J. Wong <djwong@kernel.org>
>
> In general reloading it from a single pointer should be faster than
> passing an extra argument. What is the rationale here?
I'm not sure we can make that determination in general; it's going to
depend on the number of registers the CPU has, the calling conventions,
how much inlining the compiler chooses to do, etc.
The compiler is actually _forced_ to reload the iop from the page
by the test_bit() in PagePrivate() / folio_test_private(). I want
to kill off that bit, but until I have time to work on that, we
don't have a good workaround.
next prev parent reply other threads:[~2021-07-20 11:38 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-19 18:39 [PATCH v15 00/17] Folio support in block + iomap layers Matthew Wilcox (Oracle)
2021-07-19 18:39 ` [PATCH v15 01/17] block: Add bio_add_folio() Matthew Wilcox (Oracle)
2021-07-20 1:28 ` Darrick J. Wong
2021-07-20 6:42 ` Christoph Hellwig
2021-07-20 11:16 ` Matthew Wilcox
2021-07-22 16:27 ` Matthew Wilcox
2021-07-30 8:25 ` Ming Lei
2021-07-30 11:30 ` Matthew Wilcox
2021-07-19 18:39 ` [PATCH v15 02/17] block: Add bio_for_each_folio_all() Matthew Wilcox (Oracle)
2021-07-20 1:29 ` Darrick J. Wong
2021-07-20 1:59 ` Matthew Wilcox
2021-07-20 6:48 ` Christoph Hellwig
2021-07-23 2:40 ` Matthew Wilcox
2021-07-20 12:05 ` kernel test robot
2021-07-20 12:05 ` kernel test robot
2021-07-20 12:26 ` kernel test robot
2021-07-19 18:39 ` [PATCH v15 03/17] iomap: Convert to_iomap_page to take a folio Matthew Wilcox (Oracle)
2021-07-20 6:49 ` Christoph Hellwig
2021-07-19 18:39 ` [PATCH v15 04/17] iomap: Convert iomap_page_create " Matthew Wilcox (Oracle)
2021-07-20 6:50 ` Christoph Hellwig
2021-07-19 18:39 ` [PATCH v15 05/17] iomap: Convert iomap_page_release " Matthew Wilcox (Oracle)
2021-07-20 6:52 ` Christoph Hellwig
2021-07-20 11:29 ` Matthew Wilcox
2021-07-20 11:40 ` Christoph Hellwig
2021-07-19 18:39 ` [PATCH v15 06/17] iomap: Convert iomap_releasepage to use " Matthew Wilcox (Oracle)
2021-07-20 6:54 ` Christoph Hellwig
2021-07-20 23:56 ` Darrick J. Wong
2021-07-19 18:39 ` [PATCH v15 07/17] iomap: Convert iomap_invalidatepage " Matthew Wilcox (Oracle)
2021-07-20 6:55 ` Christoph Hellwig
2021-07-20 23:57 ` Darrick J. Wong
2021-07-19 18:39 ` [PATCH v15 08/17] iomap: Pass the iomap_page into iomap_set_range_uptodate Matthew Wilcox (Oracle)
2021-07-20 6:57 ` Christoph Hellwig
2021-07-20 11:36 ` Matthew Wilcox [this message]
2021-07-19 18:39 ` [PATCH v15 09/17] iomap: Use folio offsets instead of page offsets Matthew Wilcox (Oracle)
2021-07-20 6:59 ` Christoph Hellwig
2021-07-20 11:42 ` Matthew Wilcox
2021-07-19 18:39 ` [PATCH v15 10/17] iomap: Convert bio completions to use folios Matthew Wilcox (Oracle)
2021-07-20 7:08 ` Christoph Hellwig
2021-07-19 18:39 ` [PATCH v15 11/17] iomap: Convert readahead and readpage to use a folio Matthew Wilcox (Oracle)
2021-07-20 7:09 ` Christoph Hellwig
2021-07-19 18:39 ` [PATCH v15 12/17] iomap: Convert iomap_page_mkwrite " Matthew Wilcox (Oracle)
2021-07-20 7:13 ` Christoph Hellwig
2021-07-19 18:39 ` [PATCH v15 13/17] iomap: Convert iomap_write_begin and iomap_write_end to folios Matthew Wilcox (Oracle)
2021-07-20 7:15 ` Christoph Hellwig
2021-07-20 23:59 ` Darrick J. Wong
2021-07-19 18:39 ` [PATCH v15 14/17] iomap: Convert iomap_read_inline_data to take a folio Matthew Wilcox (Oracle)
2021-07-20 7:16 ` Christoph Hellwig
2021-07-19 18:39 ` [PATCH v15 15/17] iomap: Convert iomap_write_end_inline " Matthew Wilcox (Oracle)
2021-07-20 7:17 ` Christoph Hellwig
2021-07-19 18:40 ` [PATCH v15 16/17] iomap: Convert iomap_add_to_ioend " Matthew Wilcox (Oracle)
2021-07-20 7:20 ` Christoph Hellwig
2021-07-20 11:45 ` Matthew Wilcox
2021-07-21 0:12 ` Darrick J. Wong
2021-07-21 4:27 ` Christoph Hellwig
2021-07-21 4:31 ` Matthew Wilcox
2021-07-21 15:28 ` Darrick J. Wong
2021-07-19 18:40 ` [PATCH v15 17/17] iomap: Convert iomap_migrate_page to use folios Matthew Wilcox (Oracle)
2021-07-20 7:21 ` Christoph Hellwig
2021-07-20 13:30 ` kernel test robot
2021-07-21 0:02 ` Darrick J. Wong
2021-07-20 8:44 ` [PATCH v15 00/17] Folio support in block + iomap layers Christoph Hellwig
2021-07-20 11:08 ` Matthew Wilcox
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=YPa1WT21+gi2hZT0@casper.infradead.org \
--to=willy@infradead.org \
--cc=djwong@kernel.org \
--cc=hch@infradead.org \
--cc=linux-block@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-mm@kvack.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).