/*
* Queue the page for addition to the LRU via pagevec. The decision on whether
* to add the page to the [in]active [file|anon] list is deferred until the
* pagevec is drained. This gives a chance for the caller of __lru_cache_add()
* have the page added to the active list using mark_page_accessed().
*/
void __lru_cache_add(struct page *page)
{
struct pagevec *pvec = &get_cpu_var(lru_add_pvec);
page_cache_get(page);
if (!pagevec_space(pvec))
__pagevec_lru_add(pvec);
pagevec_add(pvec, page);
put_cpu_var(lru_add_pvec);
}
/*
* Order of operations is important: flush the pagevec when it's already
* full, not when adding the last page, to make sure that last page is
* not added to the LRU directly when passed to this function. Because
* mark_page_accessed() (called after this when writing) only activates
* pages that are on the LRU, linear writes in subpage chunks would see
* every PAGEVEC_SIZE page activated, which is unexpected.
*/
void __lru_cache_add(struct page *page, enum lru_list lru)
{
struct pagevec *pvec = &get_cpu_var(lru_add_pvecs)[lru];
page_cache_get(page);
if (!pagevec_space(pvec))
__pagevec_lru_add(pvec, lru);
pagevec_add(pvec, page);
put_cpu_var(lru_add_pvecs);
}
