The patch titled
mm: document is_page_cache_freeable()
has been added to the -mm tree. Its filename is
mm-document-is_page_cache_freeable.patch
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------------------------------------------------------
Subject: mm: document is_page_cache_freeable()
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Enlighten the reader of this code about what reference count makes a page
cache page freeable.
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 5 +++++
1 file changed, 5 insertions(+)
diff -puN mm/vmscan.c~mm-document-is_page_cache_freeable mm/vmscan.c
--- a/mm/vmscan.c~mm-document-is_page_cache_freeable
+++ a/mm/vmscan.c
@@ -286,6 +286,11 @@ static inline int page_mapping_inuse(str
static inline int is_page_cache_freeable(struct page *page)
{
+ /*
+ * A freeable page cache page is referenced only by the caller
+ * that isolated the page, the page cache radix tree and
+ * optional buffer heads at page->private.
+ */
return page_count(page) - page_has_private(page) == 2;
}
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
origin.patch
vfs-make-get_sb_pseudo-set-s_maxbytes-to-value-that-can-be-cast-to-signed.patch
linux-next.patch
vfs-remove-redundant-position-check-in-do_sendfile.patch
vfs-change-sb-s_maxbytes-to-a-loff_t.patch
mm-make-swap-token-dummies-static-inlines.patch
mm-make-swap-token-dummies-static-inlines-fix.patch
mm-make-swap-token-dummies-static-inlines-fix-2.patch
mm-count-only-reclaimable-lru-pages-v2.patch
vmscan-move-clearpageactive-from-move_active_pages-to-shrink_active_list.patch
vmscan-kill-unnecessary-page-flag-test.patch
vmscan-kill-unnecessary-prefetch.patch
mm-perform-non-atomic-test-clear-of-pg_mlocked-on-free.patch
mm-warn-once-when-a-page-is-freed-with-pg_mlocked-set.patch
mm-add_to_swap_cache-must-not-sleep.patch
mm-add_to_swap_cache-does-not-return-eexist.patch
mm-drop-unneeded-double-negations.patch
mm-introduce-page_lru_base_type.patch
mm-return-boolean-from-page_is_file_cache.patch
mm-return-boolean-from-page_has_private.patch
mm-document-is_page_cache_freeable.patch
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