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From: Eric Sandeen on 9 Apr 2010 14:10
Chris Mason wrote:

> shrink_zone on my box isn't 500 bytes, but lets try the easy stuff
> first. This is against .34, if you have any trouble applying to .32,
> just add the word noinline after the word static on the function
> definitions.
>
> This makes shrink_zone disappear from my check_stack.pl output.
> Basically I think the compiler is inlining the shrink_active_zone and
> shrink_inactive_zone code into shrink_zone.
>
> -chris
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 79c8098..c70593e 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -620,7 +620,7 @@ static enum page_references page_check_references(struct page *page,
> /*
> * shrink_page_list() returns the number of reclaimed pages
> */
> -static unsigned long shrink_page_list(struct list_head *page_list,
> +static noinline unsigned long shrink_page_list(struct list_head *page_list,

FWIW akpm suggested that I add:

/*
* Rather then using noinline to prevent stack consumption, use
* noinline_for_stack instead. For documentaiton reasons.
*/
#define noinline_for_stack noinline

so maybe for a formal submission that'd be good to use.


> struct scan_control *sc,
> enum pageout_io sync_writeback)
> {
> @@ -1121,7 +1121,7 @@ static int too_many_isolated(struct zone *zone, int file,
> * shrink_inactive_list() is a helper for shrink_zone(). It returns the number
> * of reclaimed pages
> */
> -static unsigned long shrink_inactive_list(unsigned long max_scan,
> +static noinline unsigned long shrink_inactive_list(unsigned long max_scan,
> struct zone *zone, struct scan_control *sc,
> int priority, int file)
> {
> @@ -1341,7 +1341,7 @@ static void move_active_pages_to_lru(struct zone *zone,
> __count_vm_events(PGDEACTIVATE, pgmoved);
> }
>
> -static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
> +static noinline void shrink_active_list(unsigned long nr_pages, struct zone *zone,
> struct scan_control *sc, int priority, int file)
> {
> unsigned long nr_taken;
> @@ -1504,7 +1504,7 @@ static int inactive_list_is_low(struct zone *zone, struct scan_control *sc,
> return inactive_anon_is_low(zone, sc);
> }
>
> -static unsigned long shrink_list(enum lru_list lru, unsigned long nr_to_scan,
> +static noinline unsigned long shrink_list(enum lru_list lru, unsigned long nr_to_scan,
> struct zone *zone, struct scan_control *sc, int priority)
> {
> int file = is_file_lru(lru);
>
> _______________________________________________
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> xfs(a)oss.sgi.com
> http://oss.sgi.com/mailman/listinfo/xfs
>

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