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vmscan: move initialisation of mapping down

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Now that we don't interrogate the BDI for congestion, we can delay looking
up the folio's mapping until we've got further through the function,
reducing register pressure and saving a call to folio_mapping for folios
we're adding to the swap cache.

Link: https://lkml.kernel.org/r/20220504182857.4013401-13-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-05-12 20:23:03 -07:00 committed by Andrew Morton
parent 64daa5d818
commit 5441d4902f
1 changed files with 2 additions and 5 deletions
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7
mm/vmscan.c
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@ -1588,12 +1588,11 @@ retry:
stat->nr_unqueued_dirty += nr_pages;
/*
* Treat this page as congested if the underlying BDI is or if
* Treat this page as congested if
* pages are cycling through the LRU so quickly that the
* pages marked for immediate reclaim are making it to the
* end of the LRU a second time.
*/
mapping = page_mapping(page);
if (writeback && PageReclaim(page))
stat->nr_congested += nr_pages;
@ -1744,9 +1743,6 @@ retry:
if (!add_to_swap(folio))
goto activate_locked_split;
}
/* Adding to swap updated mapping */
mapping = page_mapping(page);
}
} else if (PageSwapBacked(page) && PageTransHuge(page)) {
/* Split shmem THP */
@ -1787,6 +1783,7 @@ retry:
}
}
mapping = folio_mapping(folio);
if (folio_test_dirty(folio)) {
/*
* Only kswapd can writeback filesystem folios