[PATCH 1/7] drm/ttm:fix incorrect calculate on shrink_pages

He, Roger Hongbo.He at amd.com
Tue Dec 12 10:09:11 UTC 2017

Reviewed-by: Roger He <Hongbo.He at amd.com>

-----Original Message-----
From: amd-gfx [mailto:amd-gfx-bounces at lists.freedesktop.org] On Behalf Of Monk Liu
Sent: Tuesday, December 12, 2017 5:47 PM
To: amd-gfx at lists.freedesktop.org
Cc: Liu, Monk <Monk.Liu at amd.com>
Subject: [PATCH 1/7] drm/ttm:fix incorrect calculate on shrink_pages

shrink_pages is in unit of Order after ttm_page_pool_free, but it is used by nr_free in next round so need change it into native page unit

Change-Id: I33b77ac1616e24b1b881eee54c3bd7342cfa9ab8
Signed-off-by: Monk Liu <Monk.Liu at amd.com>
 drivers/gpu/drm/ttm/ttm_page_alloc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c
index 44343a2..71945cc 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -455,6 +455,7 @@ ttm_pool_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
 		freed += (nr_free_pool - shrink_pages) << pool->order;
 		if (freed >= sc->nr_to_scan)
+		shrink_pages <<= pool->order;
 	return freed;

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