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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2020-06-27 22:19:08 -0400 |
|---|---|---|
| committer | Matthew Wilcox (Oracle) <willy@infradead.org> | 2022-01-08 00:28:41 -0500 |
| commit | 6b24ca4a1a8d4ee3221d6d44ddbb99f542e4bda3 (patch) | |
| tree | 19f30971709b643688cada0032b9b33806c633e1 /mm/migrate.c | |
| parent | 25a8de7f8d970ffa7263bd9d32a08138cd949f17 (diff) | |
| download | linux-stable-6b24ca4a1a8d4ee3221d6d44ddbb99f542e4bda3.tar.gz linux-stable-6b24ca4a1a8d4ee3221d6d44ddbb99f542e4bda3.tar.bz2 linux-stable-6b24ca4a1a8d4ee3221d6d44ddbb99f542e4bda3.zip | |
mm: Use multi-index entries in the page cache
We currently store large folios as 2^N consecutive entries. While this
consumes rather more memory than necessary, it also turns out to be buggy.
A writeback operation which starts within a tail page of a dirty folio will
not write back the folio as the xarray's dirty bit is only set on the
head index. With multi-index entries, the dirty bit will be found no
matter where in the folio the operation starts.
This does end up simplifying the page cache slightly, although not as
much as I had hoped.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Diffstat (limited to 'mm/migrate.c')
| -rw-r--r-- | mm/migrate.c | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index 311638177536..7079e6b7dbe7 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -433,14 +433,6 @@ int folio_migrate_mapping(struct address_space *mapping, } xas_store(&xas, newfolio); - if (nr > 1) { - int i; - - for (i = 1; i < nr; i++) { - xas_next(&xas); - xas_store(&xas, newfolio); - } - } /* * Drop cache reference from old page by unfreezing |