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Subject[PATCH 09/25] Calculate the migratetype for allocation only once
Date
GFP mask is converted into a migratetype when deciding which pagelist to
take a page from. However, it is happening multiple times per
allocation, at least once per zone traversed. Calculate it once.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
---
mm/page_alloc.c | 43 ++++++++++++++++++++++++++-----------------
1 files changed, 26 insertions(+), 17 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 78e1d8e..8771de3 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1067,13 +1067,13 @@ void split_page(struct page *page, unsigned int order)
* or two.
*/
static struct page *buffered_rmqueue(struct zone *preferred_zone,
- struct zone *zone, int order, gfp_t gfp_flags)
+ struct zone *zone, int order, gfp_t gfp_flags,
+ int migratetype)
{
unsigned long flags;
struct page *page;
int cold = !!(gfp_flags & __GFP_COLD);
int cpu;
- int migratetype = allocflags_to_migratetype(gfp_flags);

again:
cpu = get_cpu();
@@ -1399,7 +1399,7 @@ static void zlc_mark_zone_full(struct zonelist *zonelist, struct zoneref *z)
static struct page *
get_page_from_freelist(gfp_t gfp_mask, nodemask_t *nodemask, unsigned int order,
struct zonelist *zonelist, int high_zoneidx, int alloc_flags,
- struct zone *preferred_zone)
+ struct zone *preferred_zone, int migratetype)
{
struct zoneref *z;
struct page *page = NULL;
@@ -1451,7 +1451,8 @@ zonelist_scan:
}
}

- page = buffered_rmqueue(preferred_zone, zone, order, gfp_mask);
+ page = buffered_rmqueue(preferred_zone, zone, order,
+ gfp_mask, migratetype);
if (page)
break;
this_zone_full:
@@ -1515,7 +1516,8 @@ should_alloc_retry(gfp_t gfp_mask, unsigned int order,
static inline struct page *
__alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order,
struct zonelist *zonelist, enum zone_type high_zoneidx,
- nodemask_t *nodemask, struct zone *preferred_zone)
+ nodemask_t *nodemask, struct zone *preferred_zone,
+ int migratetype)
{
struct page *page;

@@ -1533,7 +1535,7 @@ __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order,
page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, nodemask,
order, zonelist, high_zoneidx,
ALLOC_WMARK_HIGH|ALLOC_CPUSET,
- preferred_zone);
+ preferred_zone, migratetype);
if (page)
goto out;

@@ -1554,7 +1556,7 @@ static inline struct page *
__alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order,
struct zonelist *zonelist, enum zone_type high_zoneidx,
nodemask_t *nodemask, int alloc_flags, struct zone *preferred_zone,
- unsigned long *did_some_progress)
+ int migratetype, unsigned long *did_some_progress)
{
struct page *page = NULL;
struct reclaim_state reclaim_state;
@@ -1586,7 +1588,8 @@ __alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order,
if (likely(*did_some_progress))
page = get_page_from_freelist(gfp_mask, nodemask, order,
zonelist, high_zoneidx,
- alloc_flags, preferred_zone);
+ alloc_flags, preferred_zone,
+ migratetype);
return page;
}

@@ -1607,14 +1610,15 @@ is_allocation_high_priority(struct task_struct *p, gfp_t gfp_mask)
static inline struct page *
__alloc_pages_high_priority(gfp_t gfp_mask, unsigned int order,
struct zonelist *zonelist, enum zone_type high_zoneidx,
- nodemask_t *nodemask, struct zone *preferred_zone)
+ nodemask_t *nodemask, struct zone *preferred_zone,
+ int migratetype)
{
struct page *page;

do {
page = get_page_from_freelist(gfp_mask, nodemask, order,
zonelist, high_zoneidx, ALLOC_NO_WATERMARKS,
- preferred_zone);
+ preferred_zone, migratetype);

if (!page && gfp_mask & __GFP_NOFAIL)
congestion_wait(WRITE, HZ/50);
@@ -1637,7 +1641,8 @@ void wake_all_kswapd(unsigned int order, struct zonelist *zonelist,
static inline struct page *
__alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
struct zonelist *zonelist, enum zone_type high_zoneidx,
- nodemask_t *nodemask, struct zone *preferred_zone)
+ nodemask_t *nodemask, struct zone *preferred_zone,
+ int migratetype)
{
const gfp_t wait = gfp_mask & __GFP_WAIT;
struct page *page = NULL;
@@ -1688,14 +1693,16 @@ restart:
*/
page = get_page_from_freelist(gfp_mask, nodemask, order, zonelist,
high_zoneidx, alloc_flags,
- preferred_zone);
+ preferred_zone,
+ migratetype);
if (page)
goto got_pg;

/* Allocate without watermarks if the context allows */
if (is_allocation_high_priority(p, gfp_mask))
page = __alloc_pages_high_priority(gfp_mask, order,
- zonelist, high_zoneidx, nodemask, preferred_zone);
+ zonelist, high_zoneidx, nodemask, preferred_zone,
+ migratetype);
if (page)
goto got_pg;

@@ -1708,7 +1715,7 @@ restart:
zonelist, high_zoneidx,
nodemask,
alloc_flags, preferred_zone,
- &did_some_progress);
+ migratetype, &did_some_progress);
if (page)
goto got_pg;

@@ -1720,7 +1727,8 @@ restart:
if ((gfp_mask & __GFP_FS) && !(gfp_mask & __GFP_NORETRY)) {
page = __alloc_pages_may_oom(gfp_mask, order,
zonelist, high_zoneidx,
- nodemask, preferred_zone);
+ nodemask, preferred_zone,
+ migratetype);
if (page)
goto got_pg;

@@ -1759,6 +1767,7 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
enum zone_type high_zoneidx = gfp_zone(gfp_mask);
struct zone *preferred_zone;
struct page *page;
+ int migratetype = allocflags_to_migratetype(gfp_mask);

might_sleep_if(gfp_mask & __GFP_WAIT);

@@ -1782,11 +1791,11 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
/* First allocation attempt */
page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, nodemask, order,
zonelist, high_zoneidx, ALLOC_WMARK_LOW|ALLOC_CPUSET,
- preferred_zone);
+ preferred_zone, migratetype);
if (unlikely(!page))
page = __alloc_pages_slowpath(gfp_mask, order,
zonelist, high_zoneidx, nodemask,
- preferred_zone);
+ preferred_zone, migratetype);

return page;
}
--
1.5.6.5


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