Re: [PATCH v6 3/7] mm: push lru index into shrink_[in]active_list()

Michal Hocko
2012-03-26T15:39:35Z

On Fri 23-03-12 01:56:27, Konstantin Khlebnikov wrote:
> Let's toss lru index through call stack to isolate_lru_pages(),
> this is better than its reconstructing from individual bits.
>
> Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> Acked-by: Hugh Dickins <hughd@google.com>

Looks nice
Reviewed-by: Michal Hocko <mhocko@suse.cz>

> ---
> mm/vmscan.c | 41 +++++++++++++++++------------------------
> 1 files changed, 17 insertions(+), 24 deletions(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index f4dca0c..fb6d54e 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1127,15 +1127,14 @@ int __isolate_lru_page(struct page *page, isolate_mode_t mode, int file)
> * @nr_scanned: The number of pages that were scanned.
> * @sc: The scan_control struct for this reclaim session
> * @mode: One of the LRU isolation modes
> - * @active: True [1] if isolating active pages
> - * @file: True [1] if isolating file [!anon] pages
> + * @lru LRU list id for isolating
> *
> * returns how many pages were moved onto *@dst.
> */
> static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
> struct mem_cgroup_zone *mz, struct list_head *dst,
> unsigned long *nr_scanned, struct scan_control *sc,
> - isolate_mode_t mode, int active, int file)
> + isolate_mode_t mode, enum lru_list lru)
> {
> struct lruvec *lruvec;
> struct list_head *src;
> @@ -1144,13 +1143,9 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
> unsigned long nr_lumpy_dirty = 0;
> unsigned long nr_lumpy_failed = 0;
> unsigned long scan;
> - int lru = LRU_BASE;
> + int file = is_file_lru(lru);
>
> lruvec = mem_cgroup_zone_lruvec(mz->zone, mz->mem_cgroup);
> - if (active)
> - lru += LRU_ACTIVE;
> - if (file)
> - lru += LRU_FILE;
> src = &lruvec->lists[lru];
>
> for (scan = 0; scan < nr_to_scan && !list_empty(src); scan++) {
> @@ -1487,7 +1482,7 @@ static inline bool should_reclaim_stall(unsigned long nr_taken,
> */
> static noinline_for_stack unsigned long
> shrink_inactive_list(unsigned long nr_to_scan, struct mem_cgroup_zone *mz,
> - struct scan_control *sc, int priority, int file)
> + struct scan_control *sc, int priority, enum lru_list lru)
> {
> LIST_HEAD(page_list);
> unsigned long nr_scanned;
> @@ -1498,6 +1493,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct mem_cgroup_zone *mz,
> unsigned long nr_dirty = 0;
> unsigned long nr_writeback = 0;
> isolate_mode_t isolate_mode = ISOLATE_INACTIVE;
> + int file = is_file_lru(lru);
> struct zone *zone = mz->zone;
> struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
>
> @@ -1523,7 +1519,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct mem_cgroup_zone *mz,
> spin_lock_irq(&zone->lru_lock);
>
> nr_taken = isolate_lru_pages(nr_to_scan, mz, &page_list, &nr_scanned,
> - sc, isolate_mode, 0, file);
> + sc, isolate_mode, lru);
> if (global_reclaim(sc)) {
> zone->pages_scanned += nr_scanned;
> if (current_is_kswapd())
> @@ -1661,7 +1657,7 @@ static void move_active_pages_to_lru(struct zone *zone,
> static void shrink_active_list(unsigned long nr_to_scan,
> struct mem_cgroup_zone *mz,
> struct scan_control *sc,
> - int priority, int file)
> + int priority, enum lru_list lru)
> {
> unsigned long nr_taken;
> unsigned long nr_scanned;
> @@ -1673,6 +1669,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
> struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
> unsigned long nr_rotated = 0;
> isolate_mode_t isolate_mode = ISOLATE_ACTIVE;
> + int file = is_file_lru(lru);
> struct zone *zone = mz->zone;
>
> lru_add_drain();
> @@ -1687,17 +1684,14 @@ static void shrink_active_list(unsigned long nr_to_scan,
> spin_lock_irq(&zone->lru_lock);
>
> nr_taken = isolate_lru_pages(nr_to_scan, mz, &l_hold, &nr_scanned, sc,
> - isolate_mode, 1, file);
> + isolate_mode, lru);
> if (global_reclaim(sc))
> zone->pages_scanned += nr_scanned;
>
> reclaim_stat->recent_scanned[file] += nr_taken;
>
> __count_zone_vm_events(PGREFILL, zone, nr_scanned);
> - if (file)
> - __mod_zone_page_state(zone, NR_ACTIVE_FILE, -nr_taken);
> - else
> - __mod_zone_page_state(zone, NR_ACTIVE_ANON, -nr_taken);
> + __mod_zone_page_state(zone, NR_LRU_BASE + lru, -nr_taken);
> __mod_zone_page_state(zone, NR_ISOLATED_ANON + file, nr_taken);
> spin_unlock_irq(&zone->lru_lock);
>
> @@ -1752,10 +1746,8 @@ static void shrink_active_list(unsigned long nr_to_scan,
> */
> reclaim_stat->recent_rotated[file] += nr_rotated;
>
> - move_active_pages_to_lru(zone, &l_active, &l_hold,
> - LRU_ACTIVE + file * LRU_FILE);
> - move_active_pages_to_lru(zone, &l_inactive, &l_hold,
> - LRU_BASE + file * LRU_FILE);
> + move_active_pages_to_lru(zone, &l_active, &l_hold, lru);
> + move_active_pages_to_lru(zone, &l_inactive, &l_hold, lru - LRU_ACTIVE);
> __mod_zone_page_state(zone, NR_ISOLATED_ANON + file, -nr_taken);
> spin_unlock_irq(&zone->lru_lock);
>
> @@ -1855,11 +1847,11 @@ static unsigned long shrink_list(enum lru_list lru, unsigned long nr_to_scan,
>
> if (is_active_lru(lru)) {
> if (inactive_list_is_low(mz, file))
> - shrink_active_list(nr_to_scan, mz, sc, priority, file);
> + shrink_active_list(nr_to_scan, mz, sc, priority, lru);
> return 0;
> }
>
> - return shrink_inactive_list(nr_to_scan, mz, sc, priority, file);
> + return shrink_inactive_list(nr_to_scan, mz, sc, priority, lru);
> }
>
> static int vmscan_swappiness(struct mem_cgroup_zone *mz,
> @@ -2110,7 +2102,8 @@ restart:
> * rebalance the anon lru active/inactive ratio.
> */
> if (inactive_anon_is_low(mz))
> - shrink_active_list(SWAP_CLUSTER_MAX, mz, sc, priority, 0);
> + shrink_active_list(SWAP_CLUSTER_MAX, mz,
> + sc, priority, LRU_ACTIVE_ANON);
>
> /* reclaim/compaction might need reclaim to continue */
> if (should_continue_reclaim(mz, nr_reclaimed,
> @@ -2550,7 +2543,7 @@ static void age_active_anon(struct zone *zone, struct scan_control *sc,
>
> if (inactive_anon_is_low(&mz))
> shrink_active_list(SWAP_CLUSTER_MAX, &mz,
> - sc, priority, 0);
> + sc, priority, LRU_ACTIVE_ANON);
>
> memcg = mem_cgroup_iter(NULL, memcg, NULL);
> } while (memcg);
>
> --
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--
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9
Czech Republic