The patch titled
Subject: mm/readahead: add readahead_control->dropbehind member
has been added to the -mm mm-unstable branch. Its filename is
mm-readahead-add-readahead_control-dropbehind-member.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-readahead-add-readahead_control-dropbehind-member.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Jens Axboe <axboe@xxxxxxxxx>
Subject: mm/readahead: add readahead_control->dropbehind member
Date: Fri, 20 Dec 2024 08:47:43 -0700
If ractl->dropbehind is set to true, then folios created are marked as
dropbehind as well.
Link: https://lkml.kernel.org/r/20241220154831.1086649-6-axboe@xxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Reviewed-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Brian Foster <bfoster@xxxxxxxxxx>
Cc: Chris Mason <clm@xxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/pagemap.h | 1 +
mm/readahead.c | 8 +++++++-
2 files changed, 8 insertions(+), 1 deletion(-)
--- a/include/linux/pagemap.h~mm-readahead-add-readahead_control-dropbehind-member
+++ a/include/linux/pagemap.h
@@ -1369,6 +1369,7 @@ struct readahead_control {
pgoff_t _index;
unsigned int _nr_pages;
unsigned int _batch_count;
+ bool dropbehind;
bool _workingset;
unsigned long _pflags;
};
--- a/mm/readahead.c~mm-readahead-add-readahead_control-dropbehind-member
+++ a/mm/readahead.c
@@ -181,7 +181,13 @@ static void read_pages(struct readahead_
static struct folio *ractl_alloc_folio(struct readahead_control *ractl,
gfp_t gfp_mask, unsigned int order)
{
- return filemap_alloc_folio(gfp_mask, order);
+ struct folio *folio;
+
+ folio = filemap_alloc_folio(gfp_mask, order);
+ if (folio && ractl->dropbehind)
+ __folio_set_dropbehind(folio);
+
+ return folio;
}
/**
_
Patches currently in -mm which might be from axboe@xxxxxxxxx are
mm-filemap-change-filemap_create_folio-to-take-a-struct-kiocb.patch
mm-filemap-use-page_cache_sync_ra-to-kick-off-read-ahead.patch
mm-readahead-add-folio-allocation-helper.patch
mm-add-pg_dropbehind-folio-flag.patch
mm-readahead-add-readahead_control-dropbehind-member.patch
mm-truncate-add-folio_unmap_invalidate-helper.patch
fs-add-rwf_dontcache-iocb-and-fop_dontcache-file_operations-flag.patch
mm-filemap-add-read-support-for-rwf_dontcache.patch
mm-filemap-drop-streaming-uncached-pages-when-writeback-completes.patch
mm-filemap-add-filemap_fdatawrite_range_kick-helper.patch
mm-call-filemap_fdatawrite_range_kick-after-iocb_dontcache-issue.patch
mm-add-fgp_dontcache-folio-creation-flag.patch
