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xfs: fix reclaimed page accounting in xfs_buf_free

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To obtain nr. of pages in "size" bytes, we need howmany(size, PAGE_SIZE)
not howmany(size, PAGE_SHIFT). This over-reports reclaim by orders of
magnitude, up to 4096x on a 64k page system.

Fixes: e2874632a6 ("xfs: use vmalloc instead of vm_map_area for buffer backing memory")
Cc: stable@vger.kernel.org # v6.15+
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
This commit is contained in:
Eric Sandeen 2026-08-21 17:03:37 -05:00 committed by Carlos Maiolino
parent 7538ba528c
commit 4164b1e3d7
1 changed files with 1 additions and 1 deletions
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2
fs/xfs/xfs_buf.c
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@ -139,7 +139,7 @@ xfs_buf_free(
ASSERT(list_empty(&bp->b_lru));
if (!xfs_buftarg_is_mem(bp->b_target) && size >= PAGE_SIZE)
mm_account_reclaimed_pages(howmany(size, PAGE_SHIFT));
mm_account_reclaimed_pages(howmany(size, PAGE_SIZE));
if (is_vmalloc_addr(bp->b_addr))
vfree(bp->b_addr);