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SubjectRe: [PATCH] mm: vmscan: remove unused scan_control parameter from pageout()
On Fri 04-10-19 01:41:38, Yang Shi wrote:
> Since lumpy reclaim was removed in v3.5 scan_control is not used by
> may_write_to_{queue|inode} and pageout() anymore, remove the unused
> parameter.

I haven't really checked whether it was the lumpy reclaim removal but it
is clearly not used these days.

> Cc: Mel Gorman <mgorman@techsingularity.net>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
> Cc: Michal Hocko <mhocko@suse.com>
> Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>

Acked-by: Michal Hocko <mhocko@suse.com>

Thanks!

> ---
> mm/vmscan.c | 9 ++++-----
> 1 file changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index e5d52d6..17489b8 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -774,7 +774,7 @@ static inline int is_page_cache_freeable(struct page *page)
> return page_count(page) - page_has_private(page) == 1 + page_cache_pins;
> }
>
> -static int may_write_to_inode(struct inode *inode, struct scan_control *sc)
> +static int may_write_to_inode(struct inode *inode)
> {
> if (current->flags & PF_SWAPWRITE)
> return 1;
> @@ -822,8 +822,7 @@ static void handle_write_error(struct address_space *mapping,
> * pageout is called by shrink_page_list() for each dirty page.
> * Calls ->writepage().
> */
> -static pageout_t pageout(struct page *page, struct address_space *mapping,
> - struct scan_control *sc)
> +static pageout_t pageout(struct page *page, struct address_space *mapping)
> {
> /*
> * If the page is dirty, only perform writeback if that write
> @@ -859,7 +858,7 @@ static pageout_t pageout(struct page *page, struct address_space *mapping,
> }
> if (mapping->a_ops->writepage == NULL)
> return PAGE_ACTIVATE;
> - if (!may_write_to_inode(mapping->host, sc))
> + if (!may_write_to_inode(mapping->host))
> return PAGE_KEEP;
>
> if (clear_page_dirty_for_io(page)) {
> @@ -1396,7 +1395,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
> * starts and then write it out here.
> */
> try_to_unmap_flush_dirty();
> - switch (pageout(page, mapping, sc)) {
> + switch (pageout(page, mapping)) {
> case PAGE_KEEP:
> goto keep_locked;
> case PAGE_ACTIVATE:
> --
> 1.8.3.1

--
Michal Hocko
SUSE Labs

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