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authorMel Gorman <mgorman@techsingularity.net>2018-12-28 09:35:48 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2018-12-28 21:11:48 +0100
commit0a79cdad5eb213b3a629e624565b1b3bf9192b7c (patch)
tree06aee01f5342cc975b477a9dc9e2987840453f59 /mm/page_alloc.c
parentmm: move zone watermark accesses behind an accessor (diff)
downloadlinux-0a79cdad5eb213b3a629e624565b1b3bf9192b7c.tar.xz
linux-0a79cdad5eb213b3a629e624565b1b3bf9192b7c.zip
mm: use alloc_flags to record if kswapd can wake
This is a preparation patch that copies the GFP flag __GFP_KSWAPD_RECLAIM into alloc_flags. This is a preparation patch only that avoids having to pass gfp_mask through a long callchain in a future patch. Note that the setting in the fast path happens in alloc_flags_nofragment() and it may be claimed that this has nothing to do with ALLOC_NO_FRAGMENT. That's true in this patch but is not true later so it's done now for easier review to show where the flag needs to be recorded. No functional change. [mgorman@techsingularity.net: ALLOC_KSWAPD flag needs to be applied in the !CONFIG_ZONE_DMA32 case] Link: http://lkml.kernel.org/r/20181126143503.GO23260@techsingularity.net Link: http://lkml.kernel.org/r/20181123114528.28802-4-mgorman@techsingularity.net Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: David Rientjes <rientjes@google.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Zi Yan <zi.yan@cs.rutgers.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
-rw-r--r--mm/page_alloc.c33
1 files changed, 18 insertions, 15 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 2046e333ea8f..32b3e121a388 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3268,7 +3268,6 @@ static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone)
}
#endif /* CONFIG_NUMA */
-#ifdef CONFIG_ZONE_DMA32
/*
* The restriction on ZONE_DMA32 as being a suitable zone to use to avoid
* fragmentation is subtle. If the preferred zone was HIGHMEM then
@@ -3278,10 +3277,16 @@ static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone)
* fragmentation between the Normal and DMA32 zones.
*/
static inline unsigned int
-alloc_flags_nofragment(struct zone *zone)
+alloc_flags_nofragment(struct zone *zone, gfp_t gfp_mask)
{
+ unsigned int alloc_flags = 0;
+
+ if (gfp_mask & __GFP_KSWAPD_RECLAIM)
+ alloc_flags |= ALLOC_KSWAPD;
+
+#ifdef CONFIG_ZONE_DMA32
if (zone_idx(zone) != ZONE_NORMAL)
- return 0;
+ goto out;
/*
* If ZONE_DMA32 exists, assume it is the one after ZONE_NORMAL and
@@ -3290,17 +3295,12 @@ alloc_flags_nofragment(struct zone *zone)
*/
BUILD_BUG_ON(ZONE_NORMAL - ZONE_DMA32 != 1);
if (nr_online_nodes > 1 && !populated_zone(--zone))
- return 0;
+ goto out;
- return ALLOC_NOFRAGMENT;
-}
-#else
-static inline unsigned int
-alloc_flags_nofragment(struct zone *zone)
-{
- return 0;
+out:
+#endif /* CONFIG_ZONE_DMA32 */
+ return alloc_flags;
}
-#endif
/*
* get_page_from_freelist goes through the zonelist trying to allocate
@@ -3939,6 +3939,9 @@ gfp_to_alloc_flags(gfp_t gfp_mask)
} else if (unlikely(rt_task(current)) && !in_interrupt())
alloc_flags |= ALLOC_HARDER;
+ if (gfp_mask & __GFP_KSWAPD_RECLAIM)
+ alloc_flags |= ALLOC_KSWAPD;
+
#ifdef CONFIG_CMA
if (gfpflags_to_migratetype(gfp_mask) == MIGRATE_MOVABLE)
alloc_flags |= ALLOC_CMA;
@@ -4170,7 +4173,7 @@ retry_cpuset:
if (!ac->preferred_zoneref->zone)
goto nopage;
- if (gfp_mask & __GFP_KSWAPD_RECLAIM)
+ if (alloc_flags & ALLOC_KSWAPD)
wake_all_kswapds(order, gfp_mask, ac);
/*
@@ -4228,7 +4231,7 @@ retry_cpuset:
retry:
/* Ensure kswapd doesn't accidentally go to sleep as long as we loop */
- if (gfp_mask & __GFP_KSWAPD_RECLAIM)
+ if (alloc_flags & ALLOC_KSWAPD)
wake_all_kswapds(order, gfp_mask, ac);
reserve_flags = __gfp_pfmemalloc_flags(gfp_mask);
@@ -4451,7 +4454,7 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, int preferred_nid,
* Forbid the first pass from falling back to types that fragment
* memory until all local zones are considered.
*/
- alloc_flags |= alloc_flags_nofragment(ac.preferred_zoneref->zone);
+ alloc_flags |= alloc_flags_nofragment(ac.preferred_zoneref->zone, gfp_mask);
/* First allocation attempt */
page = get_page_from_freelist(alloc_mask, order, alloc_flags, &ac);