vmscan: kill prev_priority completely

Since 2.6.28 zone->prev_priority is unused. Then it can be removed
safely. It reduce stack usage slightly.

Now I have to say that I'm sorry. 2 years ago, I thought prev_priority
can be integrate again, it's useful. but four (or more) times trying
haven't got good performance number. Thus I give up such approach.

The rest of this changelog is notes on prev_priority and why it existed in
the first place and why it might be not necessary any more. This information
is based heavily on discussions between Andrew Morton, Rik van Riel and
Kosaki Motohiro who is heavily quotes from.

Historically prev_priority was important because it determined when the VM
would start unmapping PTE pages. i.e. there are no balances of note within
the VM, Anon vs File and Mapped vs Unmapped. Without prev_priority, there
is a potential risk of unnecessarily increasing minor faults as a large
amount of read activity of use-once pages could push mapped pages to the
end of the LRU and get unmapped.

There is no proof this is still a problem but currently it is not considered
to be. Active files are not deactivated if the active file list is smaller
than the inactive list reducing the liklihood that file-mapped pages are
being pushed off the LRU and referenced executable pages are kept on the
active list to avoid them getting pushed out by read activity.

Even if it is a problem, prev_priority prev_priority wouldn't works
nowadays. First of all, current vmscan still a lot of UP centric code. it
expose some weakness on some dozens CPUs machine. I think we need more and
more improvement.

The problem is, current vmscan mix up per-system-pressure, per-zone-pressure
and per-task-pressure a bit. example, prev_priority try to boost priority to
other concurrent priority. but if the another task have mempolicy restriction,
it is unnecessary, but also makes wrong big latency and exceeding reclaim.
per-task based priority + prev_priority adjustment make the emulation of
per-system pressure. but it have two issue 1) too rough and brutal emulation
2) we need per-zone pressure, not per-system.

Another example, currently DEF_PRIORITY is 12. it mean the lru rotate about
2 cycle (1/4096 + 1/2048 + 1/1024 + .. + 1) before invoking OOM-Killer.
but if 10,0000 thrreads enter DEF_PRIORITY reclaim at the same time, the
system have higher memory pressure than priority==0 (1/4096*10,000 > 2).
prev_priority can't solve such multithreads workload issue. In other word,
prev_priority concept assume the sysmtem don't have lots threads."

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michael Rubin <mrubin@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 57 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index b7a4e6a3cf89..594eba8a44c0 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1290,20 +1290,6 @@ done:
 }
 
 /*
- * We are about to scan this zone at a certain priority level.  If that priority
- * level is smaller (ie: more urgent) than the previous priority, then note
- * that priority level within the zone.  This is done so that when the next
- * process comes in to scan this zone, it will immediately start out at this
- * priority level rather than having to build up its own scanning priority.
- * Here, this priority affects only the reclaim-mapped threshold.
- */
-static inline void note_zone_scanning_priority(struct zone *zone, int priority)
-{
-        if (priority < zone->prev_priority)
-                zone->prev_priority = priority;
-}
-
-/*
  * This moves pages from the active list to the inactive list.
  *
  * We move them the other way if the page is referenced by one or more
@@ -1766,17 +1752,8 @@ static bool shrink_zones(int priority, struct zonelist *zonelist,
                 if (scanning_global_lru(sc)) {
                         if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL))
                                 continue;
-                        note_zone_scanning_priority(zone, priority);
-
                         if (zone->all_unreclaimable && priority != DEF_PRIORITY)
                                 continue;       /* Let kswapd poll it */
-                } else {
-                        /*
-                         * Ignore cpuset limitation here. We just want to reduce
-                         * # of used pages by us regardless of memory shortage.
-                         */
-                        mem_cgroup_note_reclaim_priority(sc->mem_cgroup,
-                                                        priority);
                 }
 
                 shrink_zone(priority, zone, sc);
@@ -1877,17 +1854,6 @@ out:
         if (priority < 0)
                 priority = 0;
 
-        if (scanning_global_lru(sc)) {
-                for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
-
-                        if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL))
-                                continue;
-
-                        zone->prev_priority = priority;
-                }
-        } else
-                mem_cgroup_record_reclaim_priority(sc->mem_cgroup, priority);
-
         delayacct_freepages_end();
         put_mems_allowed();
 
@@ -2053,22 +2019,12 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order)
                 .order = order,
                 .mem_cgroup = NULL,
         };
-        /*
-         * temp_priority is used to remember the scanning priority at which
-         * this zone was successfully refilled to
-         * free_pages == high_wmark_pages(zone).
-         */
-        int temp_priority[MAX_NR_ZONES];
-
 loop_again:
         total_scanned = 0;
         sc.nr_reclaimed = 0;
         sc.may_writepage = !laptop_mode;
         count_vm_event(PAGEOUTRUN);
 
-        for (i = 0; i < pgdat->nr_zones; i++)
-                temp_priority[i] = DEF_PRIORITY;
-
         for (priority = DEF_PRIORITY; priority >= 0; priority--) {
                 int end_zone = 0;       /* Inclusive.  0 = ZONE_DMA */
                 unsigned long lru_pages = 0;
@@ -2136,9 +2092,7 @@ loop_again:
                         if (zone->all_unreclaimable && priority != DEF_PRIORITY)
                                 continue;
 
-                        temp_priority[i] = priority;
                         sc.nr_scanned = 0;
-                        note_zone_scanning_priority(zone, priority);
 
                         nid = pgdat->node_id;
                         zid = zone_idx(zone);
@@ -2211,16 +2165,6 @@ loop_again:
                         break;
         }
 out:
-        /*
-         * Note within each zone the priority level at which this zone was
-         * brought into a happy state.  So that the next thread which scans this
-         * zone will start out at that priority level.
-         */
-        for (i = 0; i < pgdat->nr_zones; i++) {
-                struct zone *zone = pgdat->node_zones + i;
-
-                zone->prev_priority = temp_priority[i];
-        }
         if (!all_zones_ok) {
                 cond_resched();
 
@@ -2639,7 +2583,6 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
                  */
                 priority = ZONE_RECLAIM_PRIORITY;
                 do {
-                        note_zone_scanning_priority(zone, priority);
                         shrink_zone(priority, zone, &sc);
                         priority--;
                 } while (priority >= 0 && sc.nr_reclaimed < nr_pages);