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mm/readahead: add readahead_control->dropbehind member

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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@kernel.dk
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Brian Foster <bfoster@redhat.com>
Cc: Chris Mason <clm@meta.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Jens Axboe 2024-12-20 08:47:43 -07:00 • committed by Andrew Morton
parent cceba6f7e4
commit 77d075221a
2 changed files with 8 additions and 1 deletions
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1
include/linux/pagemap.h
View file

@ -1358,6 +1358,7 @@ struct readahead_control {
pgoff_t _index;
unsigned int _nr_pages;
unsigned int _batch_count;
bool dropbehind;
bool _workingset;
unsigned long _pflags;
};

8
mm/readahead.c
View file

@ -181,7 +181,13 @@ static void read_pages(struct readahead_control *rac)
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;
}
/**