The page add a new condition to let gfp_to_alloc_flags return
alloc_flags with ALLOC_HARDER if the order is not 0 and migratetype is
MIGRATE_UNMOVABLE.
Then alloc umovable page that order is not 0 will try to use HighAtomic.
Signed-off-by: Hui Zhu <zhuhui@xxxxxxxxxx>
---
mm/page_alloc.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index c841af8..b54e94a 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3642,7 +3642,7 @@ static void wake_all_kswapds(unsigned int order, const struct alloc_context *ac)
}
static inline unsigned int
-gfp_to_alloc_flags(gfp_t gfp_mask)
+gfp_to_alloc_flags(gfp_t gfp_mask, int order, int migratetype)
{
unsigned int alloc_flags = ALLOC_WMARK_MIN | ALLOC_CPUSET;
@@ -3671,6 +3671,8 @@ static void wake_all_kswapds(unsigned int order, const struct alloc_context *ac)
alloc_flags &= ~ALLOC_CPUSET;
} else if (unlikely(rt_task(current)) && !in_interrupt())
alloc_flags |= ALLOC_HARDER;
+ else if (order > 0 && migratetype == MIGRATE_UNMOVABLE)
+ alloc_flags |= ALLOC_HARDER;
#ifdef CONFIG_CMA
if (gfpflags_to_migratetype(gfp_mask) == MIGRATE_MOVABLE)
@@ -3903,7 +3905,7 @@ bool gfp_pfmemalloc_allowed(gfp_t gfp_mask)
* kswapd needs to be woken up, and to avoid the cost of setting up
* alloc_flags precisely. So we do that now.
*/
- alloc_flags = gfp_to_alloc_flags(gfp_mask);
+ alloc_flags = gfp_to_alloc_flags(gfp_mask, order, ac->migratetype);
/*
* We need to recalculate the starting point for the zonelist iterator
--
1.9.1
--
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