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mm: rearrange putback_inactive_pages 

There is sometimes confusion between the global putback_lru_pages() in
migrate.c and the static putback_lru_pages() in vmscan.c: rename the
latter putback_inactive_pages(): it helps shrink_inactive_list() rather as
move_active_pages_to_lru() helps shrink_active_list().

Remove unused scan_control arg from putback_inactive_pages() and from
update_isolated_counts().  Move clear_active_flags() inside
update_isolated_counts().  Move NR_ISOLATED accounting up into
shrink_inactive_list() itself, so the balance is clearer.

Do the spin_lock_irq() before calling putback_inactive_pages() and
spin_unlock_irq() after return from it, so that it better matches
update_isolated_counts() and move_active_pages_to_lru().

Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2012-01-12 17:20:07 -08:00 committed by Linus Torvalds
parent f626012db0
commit 3f79768f23
1 changed files with 44 additions and 52 deletions
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96
mm/vmscan.c
View File

@ -1284,32 +1284,6 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
return nr_taken;
}
/*
* clear_active_flags() is a helper for shrink_active_list(), clearing
* any active bits from the pages in the list.
*/
static unsigned long clear_active_flags(struct list_head *page_list,
unsigned int *count)
{
int nr_active = 0;
int lru;
struct page *page;
list_for_each_entry(page, page_list, lru) {
int numpages = hpage_nr_pages(page);
lru = page_lru_base_type(page);
if (PageActive(page)) {
lru += LRU_ACTIVE;
ClearPageActive(page);
nr_active += numpages;
}
if (count)
count[lru] += numpages;
}
return nr_active;
}
/**
* isolate_lru_page - tries to isolate a page from its LRU list
* @page: page to isolate from its LRU list
@ -1383,26 +1357,21 @@ static int too_many_isolated(struct zone *zone, int file,
return isolated > inactive;
}
/*
* TODO: Try merging with migrations version of putback_lru_pages
*/
static noinline_for_stack void
putback_lru_pages(struct mem_cgroup_zone *mz, struct scan_control *sc,
unsigned long nr_anon, unsigned long nr_file,
struct list_head *page_list)
putback_inactive_pages(struct mem_cgroup_zone *mz,
struct list_head *page_list)
{
struct page *page;
LIST_HEAD(pages_to_free);
struct zone *zone = mz->zone;
struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
struct zone *zone = mz->zone;
LIST_HEAD(pages_to_free);
/*
* Put back any unfreeable pages.
*/
spin_lock(&zone->lru_lock);
while (!list_empty(page_list)) {
struct page *page = lru_to_page(page_list);
int lru;
page = lru_to_page(page_list);
VM_BUG_ON(PageLRU(page));
list_del(&page->lru);
if (unlikely(!page_evictable(page, NULL))) {
@ -1432,26 +1401,40 @@ putback_lru_pages(struct mem_cgroup_zone *mz, struct scan_control *sc,
list_add(&page->lru, &pages_to_free);
}
}
__mod_zone_page_state(zone, NR_ISOLATED_ANON, -nr_anon);
__mod_zone_page_state(zone, NR_ISOLATED_FILE, -nr_file);
spin_unlock_irq(&zone->lru_lock);
free_hot_cold_page_list(&pages_to_free, 1);
/*
* To save our caller's stack, now use input list for pages to free.
*/
list_splice(&pages_to_free, page_list);
}
static noinline_for_stack void
update_isolated_counts(struct mem_cgroup_zone *mz,
struct scan_control *sc,
struct list_head *page_list,
unsigned long *nr_anon,
unsigned long *nr_file,
struct list_head *isolated_list)
unsigned long *nr_file)
{
unsigned long nr_active;
struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
struct zone *zone = mz->zone;
unsigned int count[NR_LRU_LISTS] = { 0, };
struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
unsigned long nr_active = 0;
struct page *page;
int lru;
/*
* Count pages and clear active flags
*/
list_for_each_entry(page, page_list, lru) {
int numpages = hpage_nr_pages(page);
lru = page_lru_base_type(page);
if (PageActive(page)) {
lru += LRU_ACTIVE;
ClearPageActive(page);
nr_active += numpages;
}
count[lru] += numpages;
}
nr_active = clear_active_flags(isolated_list, count);
__count_vm_events(PGDEACTIVATE, nr_active);
__mod_zone_page_state(zone, NR_ACTIVE_FILE,
@ -1465,8 +1448,6 @@ update_isolated_counts(struct mem_cgroup_zone *mz,
*nr_anon = count[LRU_ACTIVE_ANON] + count[LRU_INACTIVE_ANON];
*nr_file = count[LRU_ACTIVE_FILE] + count[LRU_INACTIVE_FILE];
__mod_zone_page_state(zone, NR_ISOLATED_ANON, *nr_anon);
__mod_zone_page_state(zone, NR_ISOLATED_FILE, *nr_file);
reclaim_stat->recent_scanned[0] += *nr_anon;
reclaim_stat->recent_scanned[1] += *nr_file;
@ -1571,7 +1552,10 @@ shrink_inactive_list(unsigned long nr_to_scan, struct mem_cgroup_zone *mz,
return 0;
}
update_isolated_counts(mz, sc, &nr_anon, &nr_file, &page_list);
update_isolated_counts(mz, &page_list, &nr_anon, &nr_file);
__mod_zone_page_state(zone, NR_ISOLATED_ANON, nr_anon);
__mod_zone_page_state(zone, NR_ISOLATED_FILE, nr_file);
spin_unlock_irq(&zone->lru_lock);
@ -1585,12 +1569,20 @@ shrink_inactive_list(unsigned long nr_to_scan, struct mem_cgroup_zone *mz,
priority, &nr_dirty, &nr_writeback);
}
local_irq_disable();
spin_lock_irq(&zone->lru_lock);
if (current_is_kswapd())
__count_vm_events(KSWAPD_STEAL, nr_reclaimed);
__count_zone_vm_events(PGSTEAL, zone, nr_reclaimed);
putback_lru_pages(mz, sc, nr_anon, nr_file, &page_list);
putback_inactive_pages(mz, &page_list);
__mod_zone_page_state(zone, NR_ISOLATED_ANON, -nr_anon);
__mod_zone_page_state(zone, NR_ISOLATED_FILE, -nr_file);
spin_unlock_irq(&zone->lru_lock);
free_hot_cold_page_list(&page_list, 1);
/*
* If reclaim is isolating dirty pages under writeback, it implies