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Message-ID: <e0f12399d20d6fd7949bccda73d8dfe0275fb16c.1389443272.git.vdavydov@parallels.com>
Date: Sat, 11 Jan 2014 16:36:35 +0400
From: Vladimir Davydov <vdavydov@...allels.com>
To: Andrew Morton <akpm@...ux-foundation.org>
CC: <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
<devel@...nvz.org>, Mel Gorman <mgorman@...e.de>,
Michal Hocko <mhocko@...e.cz>,
Johannes Weiner <hannes@...xchg.org>,
Rik van Riel <riel@...hat.com>,
Dave Chinner <dchinner@...hat.com>,
Glauber Costa <glommer@...il.com>
Subject: [PATCH 5/5] mm: vmscan: remove shrink_control arg from do_try_to_free_pages()
There is no need passing on a shrink_control struct from
try_to_free_pages() and friends to do_try_to_free_pages() and then to
shrink_zones(), because it is only used in shrink_zones() and the only
field initialized on the top level is gfp_mask, which is always equal to
scan_control.gfp_mask. So let's move shrink_control initialization to
shrink_zones().
Signed-off-by: Vladimir Davydov <vdavydov@...allels.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Michal Hocko <mhocko@...e.cz>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Rik van Riel <riel@...hat.com>
Cc: Dave Chinner <dchinner@...hat.com>
Cc: Glauber Costa <glommer@...il.com>
---
mm/vmscan.c | 32 ++++++++++++--------------------
1 file changed, 12 insertions(+), 20 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index b364f3c..b09e1cd 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2291,8 +2291,7 @@ static inline bool compaction_ready(struct zone *zone, struct scan_control *sc)
* the caller that it should consider retrying the allocation instead of
* further reclaim.
*/
-static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc,
- struct shrink_control *shrink)
+static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
{
struct zoneref *z;
struct zone *zone;
@@ -2301,6 +2300,9 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc,
unsigned long lru_pages = 0;
bool aborted_reclaim = false;
struct reclaim_state *reclaim_state = current->reclaim_state;
+ struct shrink_control shrink = {
+ .gfp_mask = sc->gfp_mask,
+ };
/*
* If the number of buffer_heads in the machine exceeds the maximum
@@ -2310,7 +2312,7 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc,
if (buffer_heads_over_limit)
sc->gfp_mask |= __GFP_HIGHMEM;
- nodes_clear(shrink->nodes_to_scan);
+ nodes_clear(shrink.nodes_to_scan);
for_each_zone_zonelist_nodemask(zone, z, zonelist,
gfp_zone(sc->gfp_mask), sc->nodemask) {
@@ -2325,7 +2327,7 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc,
continue;
lru_pages += zone_reclaimable_pages(zone);
- node_set(zone_to_nid(zone), shrink->nodes_to_scan);
+ node_set(zone_to_nid(zone), shrink.nodes_to_scan);
if (sc->priority != DEF_PRIORITY &&
!zone_reclaimable(zone))
@@ -2370,7 +2372,7 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc,
* pages.
*/
if (global_reclaim(sc)) {
- shrink_slab(shrink, sc->nr_scanned, lru_pages);
+ shrink_slab(&shrink, sc->nr_scanned, lru_pages);
if (reclaim_state) {
sc->nr_reclaimed += reclaim_state->reclaimed_slab;
reclaim_state->reclaimed_slab = 0;
@@ -2417,8 +2419,7 @@ 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 shrink_control *shrink)
+ struct scan_control *sc)
{
unsigned long total_scanned = 0;
unsigned long writeback_threshold;
@@ -2433,7 +2434,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
vmpressure_prio(sc->gfp_mask, sc->target_mem_cgroup,
sc->priority);
sc->nr_scanned = 0;
- aborted_reclaim = shrink_zones(zonelist, sc, shrink);
+ aborted_reclaim = shrink_zones(zonelist, sc);
total_scanned += sc->nr_scanned;
if (sc->nr_reclaimed >= sc->nr_to_reclaim)
@@ -2596,9 +2597,6 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
.target_mem_cgroup = NULL,
.nodemask = nodemask,
};
- struct shrink_control shrink = {
- .gfp_mask = sc.gfp_mask,
- };
/*
* Do not enter reclaim if fatal signal was delivered while throttled.
@@ -2612,7 +2610,7 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
sc.may_writepage,
gfp_mask);
- nr_reclaimed = do_try_to_free_pages(zonelist, &sc, &shrink);
+ nr_reclaimed = do_try_to_free_pages(zonelist, &sc);
trace_mm_vmscan_direct_reclaim_end(nr_reclaimed);
@@ -2679,9 +2677,6 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
.gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) |
(GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK),
};
- struct shrink_control shrink = {
- .gfp_mask = sc.gfp_mask,
- };
/*
* Unlike direct reclaim via alloc_pages(), memcg's reclaim doesn't
@@ -2696,7 +2691,7 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
sc.may_writepage,
sc.gfp_mask);
- nr_reclaimed = do_try_to_free_pages(zonelist, &sc, &shrink);
+ nr_reclaimed = do_try_to_free_pages(zonelist, &sc);
trace_mm_vmscan_memcg_reclaim_end(nr_reclaimed);
@@ -3352,9 +3347,6 @@ unsigned long shrink_all_memory(unsigned long nr_to_reclaim)
.order = 0,
.priority = DEF_PRIORITY,
};
- 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;
@@ -3364,7 +3356,7 @@ 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, &shrink);
+ nr_reclaimed = do_try_to_free_pages(zonelist, &sc);
p->reclaim_state = NULL;
lockdep_clear_current_reclaim_state();
--
1.7.10.4
--
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