From: Matthew Wilcox <willy@infradead.org>
To: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>,
linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Luis Chamberlain <mcgrof@kernel.org>
Subject: Re: [PATCH 1/2] highmem: Add memcpy_to_folio()
Date: Thu, 15 Jun 2023 13:16:11 +0100 [thread overview]
Message-ID: <ZIsBC9+dCx2bifP+@casper.infradead.org> (raw)
In-Reply-To: <20230615055831.GA5609@lst.de>
On Thu, Jun 15, 2023 at 07:58:31AM +0200, Christoph Hellwig wrote:
> On Wed, Jun 14, 2023 at 02:48:52PM +0100, Matthew Wilcox (Oracle) wrote:
> > This is the folio equivalent of memcpy_to_page(), but it handles large
> > highmem folios. It may be a little too big to inline on systems that
> > have CONFIG_HIGHMEM enabled but on systems we actually care about almost
> > all the code will be eliminated.
>
> I suspect the right thing is to have the trivial version without kmapping
> for !HIGHMEM inline, and a separate version with the kmap loop out of
> line for HIGHMEM builds.
>
> Same for the next patch.
Yeah, that's what I did to zero_user_segments(). As time goes by,
I'm starting to care about performance of CONFIG_HIGHMEM systems less
and less.
next prev parent reply other threads:[~2023-06-15 12:19 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-14 11:46 [PATCH 0/7] RFC: high-order folio support for I/O Hannes Reinecke
2023-06-14 11:46 ` [PATCH 1/7] brd: use XArray instead of radix-tree to index backing pages Hannes Reinecke
2023-06-14 12:45 ` Matthew Wilcox
2023-06-14 12:50 ` Pankaj Raghav
2023-06-14 13:03 ` Hannes Reinecke
2023-06-14 11:46 ` [PATCH 2/7] brd: convert to folios Hannes Reinecke
2023-06-14 13:45 ` Matthew Wilcox
2023-06-14 13:50 ` Hannes Reinecke
2023-06-14 11:46 ` [PATCH 3/7] brd: abstract page_size conventions Hannes Reinecke
2023-06-14 11:46 ` [PATCH 4/7] brd: make sector size configurable Hannes Reinecke
2023-06-14 12:55 ` Matthew Wilcox
2023-06-14 13:02 ` Hannes Reinecke
2023-06-15 2:17 ` Dave Chinner
2023-06-15 5:55 ` Christoph Hellwig
2023-06-15 6:33 ` Hannes Reinecke
2023-06-15 6:23 ` Hannes Reinecke
2023-06-14 11:46 ` [PATCH 5/7] brd: make logical " Hannes Reinecke
2023-06-14 11:46 ` [PATCH 6/7] mm/filemap: allocate folios with mapping blocksize Hannes Reinecke
[not found] ` <CGME20230619080901eucas1p224e67aa31866d2ad8d259b2209c2db67@eucas1p2.samsung.com>
2023-06-19 8:08 ` Pankaj Raghav
2023-06-19 8:42 ` Hannes Reinecke
2023-06-19 22:57 ` Dave Chinner
2023-06-20 0:00 ` Matthew Wilcox
2023-06-20 5:57 ` Hannes Reinecke
2023-06-14 11:46 ` [PATCH 7/7] mm/readahead: align readahead down to " Hannes Reinecke
2023-06-14 13:17 ` [PATCH 0/7] RFC: high-order folio support for I/O Hannes Reinecke
2023-06-14 13:53 ` Matthew Wilcox
2023-06-14 15:06 ` Hannes Reinecke
2023-06-14 15:35 ` Hannes Reinecke
2023-06-14 17:46 ` Matthew Wilcox
2023-06-14 23:53 ` Dave Chinner
2023-06-15 6:21 ` Hannes Reinecke
2023-06-15 8:51 ` Dave Chinner
2023-06-16 16:06 ` Kent Overstreet
2023-06-15 3:44 ` Dave Chinner
2023-06-14 13:48 ` [PATCH 1/2] highmem: Add memcpy_to_folio() Matthew Wilcox (Oracle)
2023-06-14 18:38 ` kernel test robot
2023-06-14 19:30 ` kernel test robot
2023-06-15 5:58 ` Christoph Hellwig
2023-06-15 12:16 ` Matthew Wilcox [this message]
2023-06-14 13:48 ` [PATCH 2/2] highmem: Add memcpy_from_folio() Matthew Wilcox (Oracle)
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