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mm, page_alloc: remove field from alloc_context

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The classzone_idx can be inferred from preferred_zoneref so remove the
unnecessary field and save stack space.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Jesper Dangaard Brouer <brouer@redhat.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 2016-05-19 17:14:13 -07:00 committed by Linus Torvalds
parent c33d6c06f6
commit 93ea9964d1
3 changed files with 7 additions and 8 deletions
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4
mm/compaction.c
View File

@ -1602,7 +1602,7 @@ unsigned long try_to_compact_pages(gfp_t gfp_mask, unsigned int order,
status = compact_zone_order(zone, order, gfp_mask, mode,
&zone_contended, alloc_flags,
ac->classzone_idx);
ac_classzone_idx(ac));
rc = max(status, rc);
/*
* It takes at least one zone that wasn't lock contended
@ -1612,7 +1612,7 @@ unsigned long try_to_compact_pages(gfp_t gfp_mask, unsigned int order,
/* If a normal allocation would succeed, stop compacting */
if (zone_watermark_ok(zone, order, low_wmark_pages(zone),
ac->classzone_idx, alloc_flags)) {
ac_classzone_idx(ac), alloc_flags)) {
/*
* We think the allocation will succeed in this zone,
* but it is not certain, hence the false. The caller

3
mm/internal.h
View File

@ -103,12 +103,13 @@ struct alloc_context {
struct zonelist *zonelist;
nodemask_t *nodemask;
struct zoneref *preferred_zoneref;
int classzone_idx;
int migratetype;
enum zone_type high_zoneidx;
bool spread_dirty_pages;
};
#define ac_classzone_idx(ac) zonelist_zone_idx(ac->preferred_zoneref)
/*
* Locate the struct page for both the matching buddy in our
* pair (buddy1) and the combined O(n+1) page they form (page).

8
mm/page_alloc.c
View File

@ -2771,7 +2771,7 @@ zonelist_scan:
mark = zone->watermark[alloc_flags & ALLOC_WMARK_MASK];
if (!zone_watermark_fast(zone, order, mark,
ac->classzone_idx, alloc_flags)) {
ac_classzone_idx(ac), alloc_flags)) {
int ret;
/* Checked here to keep the fast path fast */
@ -2794,7 +2794,7 @@ zonelist_scan:
default:
/* did we reclaim enough */
if (zone_watermark_ok(zone, order, mark,
ac->classzone_idx, alloc_flags))
ac_classzone_idx(ac), alloc_flags))
goto try_this_zone;
continue;
@ -3114,7 +3114,7 @@ static void wake_all_kswapds(unsigned int order, const struct alloc_context *ac)
for_each_zone_zonelist_nodemask(zone, z, ac->zonelist,
ac->high_zoneidx, ac->nodemask)
wakeup_kswapd(zone, order, zonelist_zone_idx(ac->preferred_zoneref));
wakeup_kswapd(zone, order, ac_classzone_idx(ac));
}
static inline unsigned int
@ -3422,8 +3422,6 @@ retry_cpuset:
goto no_zone;
}
ac.classzone_idx = zonelist_zone_idx(ac.preferred_zoneref);
/* First allocation attempt */
page = get_page_from_freelist(alloc_mask, order, alloc_flags, &ac);
if (likely(page))