From: "Pankaj Raghav (Samsung)" <kernel@pankajraghav.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: hch@lst.de, willy@infradead.org, mcgrof@kernel.org,
akpm@linux-foundation.org, brauner@kernel.org,
chandan.babu@oracle.com, david@fromorbit.com, djwong@kernel.org,
gost.dev@samsung.com, hare@suse.de, john.g.garry@oracle.com,
linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-mm@kvack.org, linux-xfs@vger.kernel.org,
p.raghav@samsung.com, ritesh.list@gmail.com, ziy@nvidia.com
Subject: Re: [RFC] iomap: use huge zero folio in iomap_dio_zero
Date: Thu, 9 May 2024 12:31:07 +0000 [thread overview]
Message-ID: <20240509123107.hhi3lzjcn5svejvk@quentin> (raw)
In-Reply-To: <Zjtlep7rySFJFcik@infradead.org>
On Wed, May 08, 2024 at 04:43:54AM -0700, Christoph Hellwig wrote:
> On Wed, May 08, 2024 at 11:39:49AM +0000, Pankaj Raghav (Samsung) wrote:
> > At the moment, we can get a reference to the huge zero folio only through
> > the mm interface.
> >
> > Even if change the lower level interface to return THP, it can still fail
> > at the mount time and we will need the fallback right?
>
> Well, that's why I suggest doing it at mount time. Asking for it deep
> down in the write code is certainly going to be a bit problematic.
Makes sense. But failing to mount because we can't get a huge zero folio
seems wrong as we still can't guarantee it even at mount time.
With the current infrastructure I don't see anyway of geting a huge zero
folio that is guaranteed so that we don't need any fallback.
Let me know what you think.
--
Pankaj Raghav
next prev parent reply other threads:[~2024-05-09 12:31 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-03 9:53 [PATCH v5 00/11] enable bs > ps in XFS Luis Chamberlain
2024-05-03 9:53 ` [PATCH v5 01/11] readahead: rework loop in page_cache_ra_unbounded() Luis Chamberlain
2024-05-03 9:53 ` [PATCH v5 02/11] fs: Allow fine-grained control of folio sizes Luis Chamberlain
2024-05-03 9:53 ` [PATCH v5 03/11] filemap: allocate mapping_min_order folios in the page cache Luis Chamberlain
2024-05-03 9:53 ` [PATCH v5 04/11] readahead: allocate folios with mapping_min_order in readahead Luis Chamberlain
2024-05-03 14:32 ` Hannes Reinecke
2024-05-03 9:53 ` [PATCH v5 05/11] mm: split a folio in minimum folio order chunks Luis Chamberlain
2024-05-03 14:53 ` Zi Yan
2024-05-15 15:32 ` Matthew Wilcox
2024-05-16 14:56 ` Pankaj Raghav (Samsung)
2024-05-03 9:53 ` [PATCH v5 06/11] filemap: cap PTE range to be created to allowed zero fill in folio_map_range() Luis Chamberlain
2024-05-03 9:53 ` [PATCH v5 07/11] iomap: fix iomap_dio_zero() for fs bs > system page size Luis Chamberlain
2024-05-07 14:58 ` [RFC] iomap: use huge zero folio in iomap_dio_zero Pankaj Raghav (Samsung)
2024-05-07 15:11 ` Zi Yan
2024-05-07 16:11 ` Christoph Hellwig
2024-05-08 11:39 ` Pankaj Raghav (Samsung)
2024-05-08 11:43 ` Christoph Hellwig
2024-05-09 12:31 ` Pankaj Raghav (Samsung) [this message]
2024-05-09 12:46 ` Christoph Hellwig
2024-05-09 12:55 ` Pankaj Raghav (Samsung)
2024-05-09 12:58 ` Christoph Hellwig
2024-05-09 14:32 ` Darrick J. Wong
2024-05-09 15:05 ` Christoph Hellwig
2024-05-09 15:08 ` Darrick J. Wong
2024-05-09 15:09 ` Christoph Hellwig
2024-05-15 0:50 ` Matthew Wilcox
2024-05-15 2:34 ` Keith Busch
2024-05-15 4:04 ` Matthew Wilcox
2024-05-15 15:59 ` Pankaj Raghav (Samsung)
2024-05-15 18:03 ` Matthew Wilcox
2024-05-16 15:02 ` Pankaj Raghav (Samsung)
2024-05-17 12:36 ` Hannes Reinecke
2024-05-17 12:56 ` Hannes Reinecke
2024-05-17 13:30 ` Matthew Wilcox
2024-05-15 11:48 ` Christoph Hellwig
2024-05-07 16:00 ` [PATCH v5 07/11] iomap: fix iomap_dio_zero() for fs bs > system page size Matthew Wilcox
2024-05-07 16:10 ` Christoph Hellwig
2024-05-07 16:11 ` Matthew Wilcox
2024-05-07 16:13 ` Christoph Hellwig
2024-05-08 4:24 ` Matthew Wilcox
2024-05-08 11:22 ` Pankaj Raghav (Samsung)
2024-05-08 11:36 ` Christoph Hellwig
2024-05-08 11:20 ` Pankaj Raghav (Samsung)
2024-05-03 9:53 ` [PATCH v5 08/11] xfs: use kvmalloc for xattr buffers Luis Chamberlain
2024-05-03 9:53 ` [PATCH v5 09/11] xfs: expose block size in stat Luis Chamberlain
2024-05-03 9:53 ` [PATCH v5 10/11] xfs: make the calculation generic in xfs_sb_validate_fsb_count() Luis Chamberlain
2024-05-07 8:40 ` John Garry
2024-05-07 21:13 ` Darrick J. Wong
2024-05-08 11:28 ` Pankaj Raghav (Samsung)
2024-05-03 9:53 ` [PATCH v5 11/11] xfs: enable block size larger than page size support Luis Chamberlain
2024-05-07 0:05 ` Dave Chinner
-- strict thread matches above, loose matches on Subject: below --
2024-05-07 18:38 [RFC] iomap: use huge zero folio in iomap_dio_zero Ritesh Harjani
2024-05-08 11:42 ` Christoph Hellwig
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