linux-kernel - [PATCH] ion: Consider ion pool pages as indirectly reclaimable

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Date:   Wed, 25 Apr 2018 09:13:50 +0530
From:   vjitta@...eaurora.org
To:     labbott@...hat.com, sumit.semwal@...aro.org
Cc:     gregkh@...uxfoundation.org, arve@...roid.com, tkjos@...roid.com,
        maco@...roid.com, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org,
        Vijayanand Jitta <vjitta@...eaurora.org>
Subject: [PATCH] ion: Consider ion pool pages as indirectly reclaimable

From: Vijayanand Jitta <vjitta@...eaurora.org>

An issue is observed where mallocs are failing due to overcommit failure.
The failure happens when there is high ION page pool since ION page
pool is not considered reclaimable by the overcommit calculation code.
This change considers ion pool pages as indirectly reclaimable and thus
accounted as available memory in the overcommit calculation.

Signed-off-by: Vijayanand Jitta <vjitta@...eaurora.org>
---
 drivers/staging/android/ion/ion_page_pool.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/staging/android/ion/ion_page_pool.c b/drivers/staging/android/ion/ion_page_pool.c
index db8f614..9bc56eb 100644
--- a/drivers/staging/android/ion/ion_page_pool.c
+++ b/drivers/staging/android/ion/ion_page_pool.c
@@ -32,6 +32,9 @@ static void ion_page_pool_add(struct ion_page_pool *pool, struct page *page)
 		list_add_tail(&page->lru, &pool->low_items);
 		pool->low_count++;
 	}
+
+	mod_node_page_state(page_pgdat(page), NR_INDIRECTLY_RECLAIMABLE_BYTES,
+			    (1 << (PAGE_SHIFT + pool->order)));
 	mutex_unlock(&pool->mutex);
 }
 
@@ -50,6 +53,8 @@ static struct page *ion_page_pool_remove(struct ion_page_pool *pool, bool high)
 	}
 
 	list_del(&page->lru);
+	mod_node_page_state(page_pgdat(page), NR_INDIRECTLY_RECLAIMABLE_BYTES,
+			    -(1 << (PAGE_SHIFT + pool->order)));
 	return page;
 }
 
-- 
1.9.1