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mm, vmscan: cleanup lru size claculations
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lruvec_lru_size returns the full size of the LRU list while we sometimes
need a value reduced only to eligible zones (e.g.  for lowmem requests).
inactive_list_is_low is one such user.  Later patches will add more of
them.  Add a new parameter to lruvec_lru_size and allow it filter out
zones which are not eligible for the given context.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Michal Hocko <[email protected]>
Acked-by: Johannes Weiner <[email protected]>
Acked-by: Hillf Danton <[email protected]>
Acked-by: Minchan Kim <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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@torvalds
Michal Hocko authored and torvalds committed Feb 23, 2017
1 parent f095890 commit fd53880
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Showing 3 changed files with 46 additions and 47 deletions.
2 changes: 1 addition & 1 deletion include/linux/mmzone.h
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Original file line number Diff line number Diff line change
Expand Up @@ -779,7 +779,7 @@ static inline struct pglist_data *lruvec_pgdat(struct lruvec *lruvec)
#endif
}

extern unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru);
extern unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru, int zone_idx);

#ifdef CONFIG_HAVE_MEMORY_PRESENT
void memory_present(int nid, unsigned long start, unsigned long end);
Expand Down
89 changes: 44 additions & 45 deletions mm/vmscan.c
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Original file line number Diff line number Diff line change
Expand Up @@ -234,22 +234,39 @@ bool pgdat_reclaimable(struct pglist_data *pgdat)
pgdat_reclaimable_pages(pgdat) * 6;
}

unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru)
/**
* lruvec_lru_size - Returns the number of pages on the given LRU list.
* @lruvec: lru vector
* @lru: lru to use
* @zone_idx: zones to consider (use MAX_NR_ZONES for the whole LRU list)
*/
unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru, int zone_idx)
{
unsigned long lru_size;
int zid;

if (!mem_cgroup_disabled())
return mem_cgroup_get_lru_size(lruvec, lru);
lru_size = mem_cgroup_get_lru_size(lruvec, lru);
else
lru_size = node_page_state(lruvec_pgdat(lruvec), NR_LRU_BASE + lru);

return node_page_state(lruvec_pgdat(lruvec), NR_LRU_BASE + lru);
}
for (zid = zone_idx + 1; zid < MAX_NR_ZONES; zid++) {
struct zone *zone = &lruvec_pgdat(lruvec)->node_zones[zid];
unsigned long size;

unsigned long lruvec_zone_lru_size(struct lruvec *lruvec, enum lru_list lru,
int zone_idx)
{
if (!mem_cgroup_disabled())
return mem_cgroup_get_zone_lru_size(lruvec, lru, zone_idx);
if (!managed_zone(zone))
continue;

if (!mem_cgroup_disabled())
size = mem_cgroup_get_zone_lru_size(lruvec, lru, zid);
else
size = zone_page_state(&lruvec_pgdat(lruvec)->node_zones[zid],
NR_ZONE_LRU_BASE + lru);
lru_size -= min(size, lru_size);
}

return lru_size;

return zone_page_state(&lruvec_pgdat(lruvec)->node_zones[zone_idx],
NR_ZONE_LRU_BASE + lru);
}

/*
Expand Down Expand Up @@ -2049,11 +2066,10 @@ static bool inactive_list_is_low(struct lruvec *lruvec, bool file,
struct scan_control *sc, bool trace)
{
unsigned long inactive_ratio;
unsigned long total_inactive, inactive;
unsigned long total_active, active;
unsigned long inactive, active;
enum lru_list inactive_lru = file * LRU_FILE;
enum lru_list active_lru = file * LRU_FILE + LRU_ACTIVE;
unsigned long gb;
struct pglist_data *pgdat = lruvec_pgdat(lruvec);
int zid;

/*
* If we don't have swap space, anonymous page deactivation
Expand All @@ -2062,27 +2078,8 @@ static bool inactive_list_is_low(struct lruvec *lruvec, bool file,
if (!file && !total_swap_pages)
return false;

total_inactive = inactive = lruvec_lru_size(lruvec, file * LRU_FILE);
total_active = active = lruvec_lru_size(lruvec, file * LRU_FILE + LRU_ACTIVE);

/*
* For zone-constrained allocations, it is necessary to check if
* deactivations are required for lowmem to be reclaimed. This
* calculates the inactive/active pages available in eligible zones.
*/
for (zid = sc->reclaim_idx + 1; zid < MAX_NR_ZONES; zid++) {
struct zone *zone = &pgdat->node_zones[zid];
unsigned long inactive_zone, active_zone;

if (!managed_zone(zone))
continue;

inactive_zone = lruvec_zone_lru_size(lruvec, file * LRU_FILE, zid);
active_zone = lruvec_zone_lru_size(lruvec, (file * LRU_FILE) + LRU_ACTIVE, zid);

inactive -= min(inactive, inactive_zone);
active -= min(active, active_zone);
}
inactive = lruvec_lru_size(lruvec, inactive_lru, sc->reclaim_idx);
active = lruvec_lru_size(lruvec, active_lru, sc->reclaim_idx);

gb = (inactive + active) >> (30 - PAGE_SHIFT);
if (gb)
Expand All @@ -2091,10 +2088,12 @@ static bool inactive_list_is_low(struct lruvec *lruvec, bool file,
inactive_ratio = 1;

if (trace)
trace_mm_vmscan_inactive_list_is_low(pgdat->node_id,
trace_mm_vmscan_inactive_list_is_low(lruvec_pgdat(lruvec)->node_id,
sc->reclaim_idx,
total_inactive, inactive,
total_active, active, inactive_ratio, file);
lruvec_lru_size(lruvec, inactive_lru, MAX_NR_ZONES), inactive,
lruvec_lru_size(lruvec, active_lru, MAX_NR_ZONES), active,
inactive_ratio, file);

return inactive * inactive_ratio < active;
}

Expand Down Expand Up @@ -2234,7 +2233,7 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
* system is under heavy pressure.
*/
if (!inactive_list_is_low(lruvec, true, sc, false) &&
lruvec_lru_size(lruvec, LRU_INACTIVE_FILE) >> sc->priority) {
lruvec_lru_size(lruvec, LRU_INACTIVE_FILE, MAX_NR_ZONES) >> sc->priority) {
scan_balance = SCAN_FILE;
goto out;
}
Expand All @@ -2260,10 +2259,10 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
* anon in [0], file in [1]
*/

anon = lruvec_lru_size(lruvec, LRU_ACTIVE_ANON) +
lruvec_lru_size(lruvec, LRU_INACTIVE_ANON);
file = lruvec_lru_size(lruvec, LRU_ACTIVE_FILE) +
lruvec_lru_size(lruvec, LRU_INACTIVE_FILE);
anon = lruvec_lru_size(lruvec, LRU_ACTIVE_ANON, MAX_NR_ZONES) +
lruvec_lru_size(lruvec, LRU_INACTIVE_ANON, MAX_NR_ZONES);
file = lruvec_lru_size(lruvec, LRU_ACTIVE_FILE, MAX_NR_ZONES) +
lruvec_lru_size(lruvec, LRU_INACTIVE_FILE, MAX_NR_ZONES);

spin_lock_irq(&pgdat->lru_lock);
if (unlikely(reclaim_stat->recent_scanned[0] > anon / 4)) {
Expand Down Expand Up @@ -2301,7 +2300,7 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
unsigned long size;
unsigned long scan;

size = lruvec_lru_size(lruvec, lru);
size = lruvec_lru_size(lruvec, lru, MAX_NR_ZONES);
scan = size >> sc->priority;

if (!scan && pass && force_scan)
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2 changes: 1 addition & 1 deletion mm/workingset.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -267,7 +267,7 @@ bool workingset_refault(void *shadow)
}
lruvec = mem_cgroup_lruvec(pgdat, memcg);
refault = atomic_long_read(&lruvec->inactive_age);
active_file = lruvec_lru_size(lruvec, LRU_ACTIVE_FILE);
active_file = lruvec_lru_size(lruvec, LRU_ACTIVE_FILE, MAX_NR_ZONES);
rcu_read_unlock();

/*
Expand Down

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