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mm: code cleanup for MADV_FREE

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Some comments for MADV_FREE is revised and added to help people understand
the MADV_FREE code, especially the page flag, PG_swapbacked.  This makes
page_is_file_cache() isn't consistent with its comments.  So the function
is renamed to page_is_file_lru() to make them consistent again.  All these
are put in one patch as one logical change.

Suggested-by: David Hildenbrand <david@redhat.com>
Suggested-by: Johannes Weiner <hannes@cmpxchg.org>
Suggested-by: David Rientjes <rientjes@google.com>
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Michal Hocko <mhocko@kernel.org>
Acked-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Rik van Riel <riel@surriel.com>
Link: http://lkml.kernel.org/r/20200317100342.2730705-1-ying.huang@intel.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Huang Ying 2020-04-06 20:04:41 -07:00 • committed by Linus Torvalds
parent 7a9547fd4e
commit 9de4f22a60
13 changed files with 44 additions and 38 deletions
Download patch file Download diff file Expand all files Collapse all files

15
include/linux/mm_inline.h
View file

@ -6,19 +6,20 @@
#include <linux/swap.h>
/**
* page_is_file_cache - should the page be on a file LRU or anon LRU?
* page_is_file_lru - should the page be on a file LRU or anon LRU?
* @page: the page to test
*
* Returns 1 if @page is page cache page backed by a regular filesystem,
* or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed.
* Used by functions that manipulate the LRU lists, to sort a page
* onto the right LRU list.
* Returns 1 if @page is a regular filesystem backed page cache page or a lazily
* freed anonymous page (e.g. via MADV_FREE). Returns 0 if @page is a normal
* anonymous page, a tmpfs page or otherwise ram or swap backed page. Used by
* functions that manipulate the LRU lists, to sort a page onto the right LRU
* list.
*
* We would like to get this info without a page flag, but the state
* needs to survive until the page is last deleted from the LRU, which
* could be as far down as __page_cache_release.
*/
static inline int page_is_file_cache(struct page *page)
static inline int page_is_file_lru(struct page *page)
{
return !PageSwapBacked(page);
}
@ -75,7 +76,7 @@ static __always_inline void del_page_from_lru_list(struct page *page,
*/
static inline enum lru_list page_lru_base_type(struct page *page)
{
if (page_is_file_cache(page))
if (page_is_file_lru(page))
return LRU_INACTIVE_FILE;
return LRU_INACTIVE_ANON;
}