linux-kernel - [PATCH 1/1] [ion]: system-heap use PAGE_ALLOC_COSTLY

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Date:	Mon, 06 Oct 2014 14:01:03 +0530
From:	Pintu Kumar <pintu.k@...sung.com>
To:	akpm@...ux-foundation.org, gregkh@...uxfoundation.org,
	john.stultz@...aro.org, rebecca@...roid.com, ccross@...roid.com,
	heesub.shin@...sung.com, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Cc:	cpgs@...sung.com, pintu.k@...sung.com, pintu_agarwal@...oo.com,
	vishnu.ps@...sung.com, iqbal.ams@...sung.com
Subject: [PATCH 1/1] [ion]: system-heap use PAGE_ALLOC_COSTLY_ORDER for high
 order

The Android ion_system_heap uses allocation fallback mechanism
based on 8,4,0 order pages available in the system.
It changes gfp flags based on higher order allocation request.
This higher order value is hard-coded as 4, instead of using
the system defined higher order value.
Thus replacing this hard-coded value with PAGE_ALLOC_COSTLY_ORDER
which is defined as 3.
This will help mapping the higher order request in system heap with
the actual allocation request.

Signed-off-by: Pintu Kumar <pintu.k@...sung.com>
---
 drivers/staging/android/ion/ion_system_heap.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/android/ion/ion_system_heap.c b/drivers/staging/android/ion/ion_system_heap.c
index da2a63c..e6c393f 100644
--- a/drivers/staging/android/ion/ion_system_heap.c
+++ b/drivers/staging/android/ion/ion_system_heap.c
@@ -65,7 +65,7 @@ static struct page *alloc_buffer_page(struct ion_system_heap *heap,
 	} else {
 		gfp_t gfp_flags = low_order_gfp_flags;
 
-		if (order > 4)
+		if (order > PAGE_ALLOC_COSTLY_ORDER)
 			gfp_flags = high_order_gfp_flags;
 		page = alloc_pages(gfp_flags | __GFP_COMP, order);
 		if (!page)
@@ -276,7 +276,7 @@ struct ion_heap *ion_system_heap_create(struct ion_platform_heap *unused)
 		struct ion_page_pool *pool;
 		gfp_t gfp_flags = low_order_gfp_flags;
 
-		if (orders[i] > 4)
+		if (orders[i] > PAGE_ALLOC_COSTLY_ORDER)
 			gfp_flags = high_order_gfp_flags;
 		pool = ion_page_pool_create(gfp_flags, orders[i]);
 		if (!pool)
-- 
1.7.9.5

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