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vmscan: set up pagevec as late as possible in shrink_page_list()

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shrink_page_list() sets up a pagevec to release pages as according as they
are free.  It uses significant amounts of stack on the pagevec.  This
patch adds pages to be freed via pagevec to a linked list which is then
freed en-masse at the end.  This avoids using stack in the main path that
potentially calls writepage().

Signed-off-by: Mel Gorman <[email protected]>
Reviewed-by: Rik van Riel <[email protected]>
Cc: Dave Chinner <[email protected]>
Cc: Chris Mason <[email protected]>
Cc: Nick Piggin <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: KAMEZAWA Hiroyuki <[email protected]>
Cc: KOSAKI Motohiro <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Michael Rubin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mel Gorman 2010-08-09 17:19:31 -07:00 • committed by Linus Torvalds
commit abe4c3b50c
1 changed files with 28 additions and 8 deletions
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36
mm/vmscan.c
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@ -622,6 +622,24 @@ static enum page_references page_check_references(struct page *page,
return PAGEREF_RECLAIM;
}
static noinline_for_stack void free_page_list(struct list_head *free_pages)
{
struct pagevec freed_pvec;
struct page *page, *tmp;
pagevec_init(&freed_pvec, 1);
list_for_each_entry_safe(page, tmp, free_pages, lru) {
list_del(&page->lru);
if (!pagevec_add(&freed_pvec, page)) {
__pagevec_free(&freed_pvec);
pagevec_reinit(&freed_pvec);
}
}
pagevec_free(&freed_pvec);
}
/*
* shrink_page_list() returns the number of reclaimed pages
*/
@ -630,13 +648,12 @@ static unsigned long shrink_page_list(struct list_head *page_list,
enum pageout_io sync_writeback)
{
LIST_HEAD(ret_pages);
struct pagevec freed_pvec;
LIST_HEAD(free_pages);
int pgactivate = 0;
unsigned long nr_reclaimed = 0;
cond_resched();
pagevec_init(&freed_pvec, 1);
while (!list_empty(page_list)) {
enum page_references references;
struct address_space *mapping;
@ -811,10 +828,12 @@ static unsigned long shrink_page_list(struct list_head *page_list,
__clear_page_locked(page);
free_it:
nr_reclaimed++;
if (!pagevec_add(&freed_pvec, page)) {
__pagevec_free(&freed_pvec);
pagevec_reinit(&freed_pvec);
}
/*
* Is there need to periodically free_page_list? It would
* appear not as the counts should be low
*/
list_add(&page->lru, &free_pages);
continue;
cull_mlocked:
@ -837,9 +856,10 @@ keep:
list_add(&page->lru, &ret_pages);
VM_BUG_ON(PageLRU(page) || PageUnevictable(page));
}
free_page_list(&free_pages);
list_splice(&ret_pages, page_list);
if (pagevec_count(&freed_pvec))
__pagevec_free(&freed_pvec);
count_vm_events(PGACTIVATE, pgactivate);
return nr_reclaimed;
}