From: "Pankaj Raghav (Samsung)" <kernel@pankajraghav.com>
To: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Matthew Wilcox <willy@infradead.org>,
linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org, david@fromorbit.com,
chandan.babu@oracle.com, akpm@linux-foundation.org,
mcgrof@kernel.org, ziy@nvidia.com, hare@suse.de,
djwong@kernel.org, gost.dev@samsung.com, linux-mm@kvack.org,
Pankaj Raghav <p.raghav@samsung.com>
Subject: Re: [PATCH 03/13] filemap: align the index to mapping_min_order in the page cache
Date: Tue, 27 Feb 2024 17:55:35 +0100 [thread overview]
Message-ID: <4zpsfvy3e4hkc4avvjjr34rgo7ggpd6hpflptmiauvxwm3dpvk@5wulihwpwbyp> (raw)
In-Reply-To: <vsy43j4pwgh4thcqbhmotap7rgzg5dnet42gd5z6x4yt3zwnu4@5w4ousyue36m>
> > >
> > > you guys are both wrong, just use rounddown()
> >
> > Umm, what do you mean just use rounddown? rounddown to ...?
> >
> > We need to get index that are in PAGE units but aligned to min_order
> > pages.
> >
> > The original patch did this:
> >
> > index = mapping_align_start_index(mapping, iocb->ki_pos >> PAGE_SHIFT);
> >
> > Which is essentially a rounddown operation (probably this is what you
> > are suggesting?).
> >
> > So what willy is proposing will do the same. To me, what I proposed is
> > less complicated but to willy it is the other way around.
>
> Ok, I just found the code for mapping_align_start_index() - it is just a
> round_down().
>
> Never mind; patch looks fine (aside from perhaps some quibbling over
> whether the round_down()) should be done before calling readahead or
> within readahead; I think that might have been more what willy was
> keying in on)
Yeah, exactly.
I have one question while I have you here.
When we have this support in the page cache, do you think bcachefs can make
use of this support to enable bs > ps in bcachefs as it already makes use
of large folios?
Do you think it is just a simple mapping_set_large_folios ->
mapping_set_folio_min_order(.., block_size order) or it requires more
effort?
next prev parent reply other threads:[~2024-02-27 16:55 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-26 9:49 [PATCH 00/13] enable bs > ps in XFS Pankaj Raghav (Samsung)
2024-02-26 9:49 ` [PATCH 01/13] mm: Support order-1 folios in the page cache Pankaj Raghav (Samsung)
2024-02-26 9:49 ` [PATCH 02/13] fs: Allow fine-grained control of folio sizes Pankaj Raghav (Samsung)
2024-02-26 9:49 ` [PATCH 03/13] filemap: align the index to mapping_min_order in the page cache Pankaj Raghav (Samsung)
2024-02-26 14:40 ` Matthew Wilcox
2024-02-27 10:06 ` Pankaj Raghav (Samsung)
2024-02-27 16:22 ` Kent Overstreet
2024-02-27 16:36 ` Pankaj Raghav (Samsung)
2024-02-27 16:40 ` Kent Overstreet
2024-02-27 16:55 ` Pankaj Raghav (Samsung) [this message]
2024-02-27 17:02 ` Kent Overstreet
2024-02-27 17:09 ` Pankaj Raghav (Samsung)
2024-02-26 9:49 ` [PATCH 04/13] filemap: use mapping_min_order while allocating folios Pankaj Raghav (Samsung)
2024-02-26 14:47 ` Matthew Wilcox
2024-02-27 12:09 ` Pankaj Raghav (Samsung)
2024-02-26 9:49 ` [PATCH 05/13] readahead: set file_ra_state->ra_pages to be at least mapping_min_order Pankaj Raghav (Samsung)
2024-02-26 14:49 ` Matthew Wilcox
2024-02-27 12:42 ` Pankaj Raghav (Samsung)
2024-02-26 9:49 ` [PATCH 06/13] readahead: align index to mapping_min_order in ondemand_ra and force_ra Pankaj Raghav (Samsung)
2024-02-26 9:49 ` [PATCH 07/13] readahead: rework loop in page_cache_ra_unbounded() Pankaj Raghav (Samsung)
2024-02-26 9:49 ` [PATCH 08/13] readahead: allocate folios with mapping_min_order in ra_(unbounded|order) Pankaj Raghav (Samsung)
2024-02-26 9:49 ` [PATCH 09/13] mm: do not split a folio if it has minimum folio order requirement Pankaj Raghav (Samsung)
2024-02-26 9:49 ` [PATCH 10/13] iomap: fix iomap_dio_zero() for fs bs > system page size Pankaj Raghav (Samsung)
2024-02-26 17:58 ` Matthew Wilcox
2024-02-27 9:33 ` Pankaj Raghav (Samsung)
2024-02-26 9:49 ` [PATCH 11/13] xfs: expose block size in stat Pankaj Raghav (Samsung)
2024-02-26 12:44 ` Dave Chinner
2024-02-27 8:53 ` Pankaj Raghav (Samsung)
2024-02-26 9:49 ` [PATCH 12/13] xfs: make the calculation generic in xfs_sb_validate_fsb_count() Pankaj Raghav (Samsung)
2024-02-26 12:47 ` Dave Chinner
2024-02-26 13:21 ` Matthew Wilcox
2024-02-27 8:44 ` Pankaj Raghav (Samsung)
2024-02-26 9:49 ` [PATCH 13/13] xfs: enable block size larger than page size support Pankaj Raghav (Samsung)
2024-02-26 13:26 ` Matthew Wilcox
2024-02-26 21:18 ` Dave Chinner
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