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mm: add & use zone_end_pfn() and zone_spans_pfn()

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Add 2 helpers (zone_end_pfn() and zone_spans_pfn()) to reduce code
duplication.

This also switches to using them in compaction (where an additional
variable needed to be renamed), page_alloc, vmstat, memory_hotplug, and
kmemleak.

Note that in compaction.c I avoid calling zone_end_pfn() repeatedly
because I expect at some point the sycronization issues with start_pfn &
spanned_pages will need fixing, either by actually using the seqlock or
clever memory barrier usage.

Signed-off-by: Cody P Schafer <[email protected]>
Cc: David Hansen <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Mel Gorman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Cody P Schafer 2013-02-22 16:35:23 -08:00 • committed by Linus Torvalds
commit 108bcc96ef
6 changed files with 32 additions and 27 deletions
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10
mm/compaction.c
View file

@ -86,7 +86,7 @@ static inline bool isolation_suitable(struct compact_control *cc,
static void __reset_isolation_suitable(struct zone *zone)
{
unsigned long start_pfn = zone->zone_start_pfn;
unsigned long end_pfn = zone->zone_start_pfn + zone->spanned_pages;
unsigned long end_pfn = zone_end_pfn(zone);
unsigned long pfn;
zone->compact_cached_migrate_pfn = start_pfn;
@ -647,7 +647,7 @@ static void isolate_freepages(struct zone *zone,
struct compact_control *cc)
{
struct page *page;
unsigned long high_pfn, low_pfn, pfn, zone_end_pfn, end_pfn;
unsigned long high_pfn, low_pfn, pfn, z_end_pfn, end_pfn;
int nr_freepages = cc->nr_freepages;
struct list_head *freelist = &cc->freepages;
@ -666,7 +666,7 @@ static void isolate_freepages(struct zone *zone,
*/
high_pfn = min(low_pfn, pfn);
zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages;
z_end_pfn = zone_end_pfn(zone);
/*
* Isolate free pages until enough are available to migrate the
@ -709,7 +709,7 @@ static void isolate_freepages(struct zone *zone,
* only scans within a pageblock
*/
end_pfn = ALIGN(pfn + 1, pageblock_nr_pages);
end_pfn = min(end_pfn, zone_end_pfn);
end_pfn = min(end_pfn, z_end_pfn);
isolated = isolate_freepages_block(cc, pfn, end_pfn,
freelist, false);
nr_freepages += isolated;
@ -923,7 +923,7 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
{
int ret;
unsigned long start_pfn = zone->zone_start_pfn;
unsigned long end_pfn = zone->zone_start_pfn + zone->spanned_pages;
unsigned long end_pfn = zone_end_pfn(zone);
ret = compaction_suitable(zone, cc->order);
switch (ret) {