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vmscan: change shrink_slab() interfaces by passing shrink_control
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Consolidate the existing parameters to shrink_slab() into a new
shrink_control struct.  This is needed later to pass the same struct to
shrinkers.

Signed-off-by: Ying Han <yinghan@google.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Acked-by: Pavel Emelyanov <xemul@openvz.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@yinghan @torvalds
yinghan authored and torvalds committed May 25, 2011
1 parent 7b1de58 commit a09ed5e
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Showing 4 changed files with 55 additions and 17 deletions.
6 changes: 5 additions & 1 deletion fs/drop_caches.c
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Original file line number Diff line number Diff line change
Expand Up @@ -40,9 +40,13 @@ static void drop_pagecache_sb(struct super_block *sb, void *unused)
static void drop_slab(void)
{
int nr_objects;
struct shrink_control shrink = {
.gfp_mask = GFP_KERNEL,
.nr_scanned = 1000,
};

do {
nr_objects = shrink_slab(1000, GFP_KERNEL, 1000);
nr_objects = shrink_slab(&shrink, 1000);
} while (nr_objects > 10);
}

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13 changes: 11 additions & 2 deletions include/linux/mm.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1161,6 +1161,15 @@ static inline void sync_mm_rss(struct task_struct *task, struct mm_struct *mm)
}
#endif

/*
* This struct is used to pass information from page reclaim to the shrinkers.
* We consolidate the values for easier extention later.
*/
struct shrink_control {
unsigned long nr_scanned;
gfp_t gfp_mask;
};

/*
* A callback you can register to apply pressure to ageable caches.
*
Expand Down Expand Up @@ -1630,8 +1639,8 @@ int in_gate_area_no_mm(unsigned long addr);

int drop_caches_sysctl_handler(struct ctl_table *, int,
void __user *, size_t *, loff_t *);
unsigned long shrink_slab(unsigned long scanned, gfp_t gfp_mask,
unsigned long lru_pages);
unsigned long shrink_slab(struct shrink_control *shrink,
unsigned long lru_pages);

#ifndef CONFIG_MMU
#define randomize_va_space 0
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7 changes: 6 additions & 1 deletion mm/memory-failure.c
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Original file line number Diff line number Diff line change
Expand Up @@ -239,7 +239,12 @@ void shake_page(struct page *p, int access)
if (access) {
int nr;
do {
nr = shrink_slab(1000, GFP_KERNEL, 1000);
struct shrink_control shrink = {
.gfp_mask = GFP_KERNEL,
.nr_scanned = 1000,
};

nr = shrink_slab(&shrink, 1000);
if (page_count(p) == 1)
break;
} while (nr > 10);
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46 changes: 33 additions & 13 deletions mm/vmscan.c
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Original file line number Diff line number Diff line change
Expand Up @@ -222,11 +222,13 @@ EXPORT_SYMBOL(unregister_shrinker);
*
* Returns the number of slab objects which we shrunk.
*/
unsigned long shrink_slab(unsigned long scanned, gfp_t gfp_mask,
unsigned long lru_pages)
unsigned long shrink_slab(struct shrink_control *shrink,
unsigned long lru_pages)
{
struct shrinker *shrinker;
unsigned long ret = 0;
unsigned long scanned = shrink->nr_scanned;
gfp_t gfp_mask = shrink->gfp_mask;

if (scanned == 0)
scanned = SWAP_CLUSTER_MAX;
Expand Down Expand Up @@ -2035,7 +2037,8 @@ static bool all_unreclaimable(struct zonelist *zonelist,
* else, the number of pages reclaimed
*/
static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
struct scan_control *sc)
struct scan_control *sc,
struct shrink_control *shrink)
{
int priority;
unsigned long total_scanned = 0;
Expand Down Expand Up @@ -2069,7 +2072,8 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
lru_pages += zone_reclaimable_pages(zone);
}

shrink_slab(sc->nr_scanned, sc->gfp_mask, lru_pages);
shrink->nr_scanned = sc->nr_scanned;
shrink_slab(shrink, lru_pages);
if (reclaim_state) {
sc->nr_reclaimed += reclaim_state->reclaimed_slab;
reclaim_state->reclaimed_slab = 0;
Expand Down Expand Up @@ -2141,12 +2145,15 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
.mem_cgroup = NULL,
.nodemask = nodemask,
};
struct shrink_control shrink = {
.gfp_mask = sc.gfp_mask,
};

trace_mm_vmscan_direct_reclaim_begin(order,
sc.may_writepage,
gfp_mask);

nr_reclaimed = do_try_to_free_pages(zonelist, &sc);
nr_reclaimed = do_try_to_free_pages(zonelist, &sc, &shrink);

trace_mm_vmscan_direct_reclaim_end(nr_reclaimed);

Expand Down Expand Up @@ -2206,17 +2213,20 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont,
.order = 0,
.mem_cgroup = mem_cont,
.nodemask = NULL, /* we don't care the placement */
.gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) |
(GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK),
};
struct shrink_control shrink = {
.gfp_mask = sc.gfp_mask,
};

sc.gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) |
(GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK);
zonelist = NODE_DATA(numa_node_id())->node_zonelists;

trace_mm_vmscan_memcg_reclaim_begin(0,
sc.may_writepage,
sc.gfp_mask);

nr_reclaimed = do_try_to_free_pages(zonelist, &sc);
nr_reclaimed = do_try_to_free_pages(zonelist, &sc, &shrink);

trace_mm_vmscan_memcg_reclaim_end(nr_reclaimed);

Expand Down Expand Up @@ -2344,6 +2354,9 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order,
.order = order,
.mem_cgroup = NULL,
};
struct shrink_control shrink = {
.gfp_mask = sc.gfp_mask,
};
loop_again:
total_scanned = 0;
sc.nr_reclaimed = 0;
Expand Down Expand Up @@ -2443,8 +2456,8 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order,
end_zone, 0))
shrink_zone(priority, zone, &sc);
reclaim_state->reclaimed_slab = 0;
nr_slab = shrink_slab(sc.nr_scanned, GFP_KERNEL,
lru_pages);
shrink.nr_scanned = sc.nr_scanned;
nr_slab = shrink_slab(&shrink, lru_pages);
sc.nr_reclaimed += reclaim_state->reclaimed_slab;
total_scanned += sc.nr_scanned;

Expand Down Expand Up @@ -2796,7 +2809,10 @@ unsigned long shrink_all_memory(unsigned long nr_to_reclaim)
.swappiness = vm_swappiness,
.order = 0,
};
struct zonelist * zonelist = node_zonelist(numa_node_id(), sc.gfp_mask);
struct shrink_control shrink = {
.gfp_mask = sc.gfp_mask,
};
struct zonelist *zonelist = node_zonelist(numa_node_id(), sc.gfp_mask);
struct task_struct *p = current;
unsigned long nr_reclaimed;

Expand All @@ -2805,7 +2821,7 @@ unsigned long shrink_all_memory(unsigned long nr_to_reclaim)
reclaim_state.reclaimed_slab = 0;
p->reclaim_state = &reclaim_state;

nr_reclaimed = do_try_to_free_pages(zonelist, &sc);
nr_reclaimed = do_try_to_free_pages(zonelist, &sc, &shrink);

p->reclaim_state = NULL;
lockdep_clear_current_reclaim_state();
Expand Down Expand Up @@ -2980,6 +2996,9 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
.swappiness = vm_swappiness,
.order = order,
};
struct shrink_control shrink = {
.gfp_mask = sc.gfp_mask,
};
unsigned long nr_slab_pages0, nr_slab_pages1;

cond_resched();
Expand All @@ -3006,6 +3025,7 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
}

nr_slab_pages0 = zone_page_state(zone, NR_SLAB_RECLAIMABLE);
shrink.nr_scanned = sc.nr_scanned;
if (nr_slab_pages0 > zone->min_slab_pages) {
/*
* shrink_slab() does not currently allow us to determine how
Expand All @@ -3021,7 +3041,7 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
unsigned long lru_pages = zone_reclaimable_pages(zone);

/* No reclaimable slab or very low memory pressure */
if (!shrink_slab(sc.nr_scanned, gfp_mask, lru_pages))
if (!shrink_slab(&shrink, lru_pages))
break;

/* Freed enough memory */
Expand Down

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