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page allocator: calculate the migratetype for allocation only once 

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>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mel Gorman 2009-06-16 15:32:00 -07:00 committed by Linus Torvalds
parent 5117f45d11
commit 3dd2826698
1 changed files with 26 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
mm/page_alloc.c
View File

@ -1061,13 +1061,13 @@ 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();
@ -1389,7 +1389,7 @@ 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;
@ -1433,7 +1433,8 @@ get_page_from_freelist(gfp_t gfp_mask, nodemask_t *nodemask, unsigned int order,
}
}
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:
@ -1495,7 +1496,8 @@ 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;
@ -1513,7 +1515,7 @@ __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;
@ -1534,7 +1536,7 @@ 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;
@ -1567,7 +1569,8 @@ __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;
}
@ -1587,14 +1590,15 @@ 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);
@ -1617,7 +1621,8 @@ 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;
@ -1668,7 +1673,8 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
*/
page = get_page_from_freelist(gfp_mask, nodemask, order, zonelist,
high_zoneidx, alloc_flags,
preferred_zone);
preferred_zone,
migratetype);
if (page)
goto got_pg;
@ -1678,7 +1684,8 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
/* Do not dip into emergency reserves if specified */
if (!(gfp_mask & __GFP_NOMEMALLOC)) {
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;
}
@ -1696,7 +1703,7 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
zonelist, high_zoneidx,
nodemask,
alloc_flags, preferred_zone,
&did_some_progress);
migratetype, &did_some_progress);
if (page)
goto got_pg;
@ -1708,7 +1715,8 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
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;
@ -1755,6 +1763,7 @@ __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);
lockdep_trace_alloc(gfp_mask);
@ -1779,11 +1788,11 @@ __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;
}