From: "Pankaj Raghav (Samsung)" <kernel@pankajraghav.com>
To: willy@infradead.org, linux-xfs@vger.kernel.org,
linux-fsdevel@vger.kernel.org
Cc: gost.dev@samsung.com, chandan.babu@oracle.com, hare@suse.de,
mcgrof@kernel.org, djwong@kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, david@fromorbit.com,
akpm@linux-foundation.org, Pankaj Raghav <p.raghav@samsung.com>
Subject: [PATCH v3 04/11] readahead: rework loop in page_cache_ra_unbounded()
Date: Wed, 13 Mar 2024 18:02:46 +0100 [thread overview]
Message-ID: <20240313170253.2324812-5-kernel@pankajraghav.com> (raw)
In-Reply-To: <20240313170253.2324812-1-kernel@pankajraghav.com>
From: Hannes Reinecke <hare@suse.de>
Rework the loop in page_cache_ra_unbounded() to advance with
the number of pages in a folio instead of just one page at a time.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Co-developed-by: Pankaj Raghav <p.raghav@samsung.com>
Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
Acked-by: Darrick J. Wong <djwong@kernel.org>
---
mm/readahead.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/mm/readahead.c b/mm/readahead.c
index 369c70e2be42..37b938f4b54f 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -208,7 +208,7 @@ void page_cache_ra_unbounded(struct readahead_control *ractl,
struct address_space *mapping = ractl->mapping;
unsigned long index = readahead_index(ractl);
gfp_t gfp_mask = readahead_gfp_mask(mapping);
- unsigned long i;
+ unsigned long i = 0;
/*
* Partway through the readahead operation, we will have added
@@ -226,7 +226,7 @@ void page_cache_ra_unbounded(struct readahead_control *ractl,
/*
* Preallocate as many pages as we will need.
*/
- for (i = 0; i < nr_to_read; i++) {
+ while (i < nr_to_read) {
struct folio *folio = xa_load(&mapping->i_pages, index + i);
if (folio && !xa_is_value(folio)) {
@@ -239,8 +239,8 @@ void page_cache_ra_unbounded(struct readahead_control *ractl,
* not worth getting one just for that.
*/
read_pages(ractl);
- ractl->_index++;
- i = ractl->_index + ractl->_nr_pages - index - 1;
+ ractl->_index += folio_nr_pages(folio);
+ i = ractl->_index + ractl->_nr_pages - index;
continue;
}
@@ -252,13 +252,14 @@ void page_cache_ra_unbounded(struct readahead_control *ractl,
folio_put(folio);
read_pages(ractl);
ractl->_index++;
- i = ractl->_index + ractl->_nr_pages - index - 1;
+ i = ractl->_index + ractl->_nr_pages - index;
continue;
}
if (i == nr_to_read - lookahead_size)
folio_set_readahead(folio);
ractl->_workingset |= folio_test_workingset(folio);
- ractl->_nr_pages++;
+ ractl->_nr_pages += folio_nr_pages(folio);
+ i += folio_nr_pages(folio);
}
/*
--
2.43.0
next prev parent reply other threads:[~2024-03-13 17:03 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-13 17:02 [PATCH v3 00/11] enable bs > ps in XFS Pankaj Raghav (Samsung)
2024-03-13 17:02 ` [PATCH v3 01/11] mm: Support order-1 folios in the page cache Pankaj Raghav (Samsung)
2024-03-13 17:02 ` [PATCH v3 02/11] fs: Allow fine-grained control of folio sizes Pankaj Raghav (Samsung)
2024-03-25 18:29 ` Matthew Wilcox
2024-03-26 8:44 ` Pankaj Raghav (Samsung)
2024-03-13 17:02 ` [PATCH v3 03/11] filemap: allocate mapping_min_order folios in the page cache Pankaj Raghav (Samsung)
2024-03-15 13:21 ` Pankaj Raghav (Samsung)
2024-03-13 17:02 ` Pankaj Raghav (Samsung) [this message]
2024-03-25 18:41 ` [PATCH v3 04/11] readahead: rework loop in page_cache_ra_unbounded() Matthew Wilcox
2024-03-26 8:56 ` Pankaj Raghav (Samsung)
2024-03-26 9:39 ` Hannes Reinecke
2024-03-26 9:44 ` Pankaj Raghav
2024-03-26 10:00 ` Hannes Reinecke
2024-03-26 10:06 ` Pankaj Raghav
2024-03-26 10:55 ` Hannes Reinecke
2024-03-26 13:41 ` Pankaj Raghav (Samsung)
2024-03-26 15:11 ` Pankaj Raghav (Samsung)
2024-03-13 17:02 ` [PATCH v3 05/11] readahead: allocate folios with mapping_min_order in readahead Pankaj Raghav (Samsung)
2024-03-25 19:00 ` Matthew Wilcox
2024-03-26 13:08 ` Pankaj Raghav (Samsung)
2024-04-22 11:03 ` Pankaj Raghav (Samsung)
2024-03-13 17:02 ` [PATCH v3 06/11] readahead: round up file_ra_state->ra_pages to mapping_min_nrpages Pankaj Raghav (Samsung)
2024-03-13 17:02 ` [PATCH v3 07/11] mm: do not split a folio if it has minimum folio order requirement Pankaj Raghav (Samsung)
2024-03-25 19:06 ` Matthew Wilcox
2024-03-26 16:10 ` Pankaj Raghav (Samsung)
2024-03-26 16:23 ` Zi Yan
2024-03-26 16:33 ` Pankaj Raghav
2024-03-26 16:38 ` Zi Yan
2024-03-13 17:02 ` [PATCH v3 08/11] iomap: fix iomap_dio_zero() for fs bs > system page size Pankaj Raghav (Samsung)
2024-03-13 17:02 ` [PATCH v3 09/11] xfs: expose block size in stat Pankaj Raghav (Samsung)
2024-03-13 17:02 ` [PATCH v3 10/11] xfs: make the calculation generic in xfs_sb_validate_fsb_count() Pankaj Raghav (Samsung)
2024-03-25 19:15 ` Matthew Wilcox
2024-03-26 9:53 ` Pankaj Raghav (Samsung)
2024-03-13 17:02 ` [PATCH v3 11/11] xfs: enable block size larger than page size support Pankaj Raghav (Samsung)
2024-03-25 19:19 ` [PATCH v3 00/11] enable bs > ps in XFS Matthew Wilcox
2024-03-26 9:53 ` Hannes Reinecke
2024-03-26 15:06 ` Pankaj Raghav
2024-03-26 14:54 ` Pankaj Raghav (Samsung)
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