4.4-stable review patch. If anyone has any objections, please let me know.
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From: Chen Feng puck.chen@hisilicon.com
commit 2ef230531ee171a475fc3ddad5516dd7e09a8a77 upstream.
Since ion alloc can be called by userspace,eg gralloc. When it is called frequently, the efficiency of kswapd is to low. And the reclaimed memory is too lower. In this way, the kswapd can use to much cpu resources.
With 3.5GB DMA Zone and 0.5 Normal Zone.
pgsteal_kswapd_dma 9364140 pgsteal_kswapd_normal 7071043 pgscan_kswapd_dma 10428250 pgscan_kswapd_normal 37840094
With this change the reclaim ratio has greatly improved 18.9% -> 72.5%
Signed-off-by: Chen Feng puck.chen@hisilicon.com Signed-off-by: Lu bing albert.lubing@hisilicon.com Reviewed-by: Laura Abbott labbott@redhat.com Cc: Greg Hackmann ghackmann@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/staging/android/ion/ion_system_heap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/staging/android/ion/ion_system_heap.c +++ b/drivers/staging/android/ion/ion_system_heap.c @@ -27,7 +27,7 @@ #include "ion_priv.h"
static gfp_t high_order_gfp_flags = (GFP_HIGHUSER | __GFP_ZERO | __GFP_NOWARN | - __GFP_NORETRY) & ~__GFP_DIRECT_RECLAIM; + __GFP_NORETRY) & ~__GFP_RECLAIM; static gfp_t low_order_gfp_flags = (GFP_HIGHUSER | __GFP_ZERO | __GFP_NOWARN); static const unsigned int orders[] = {8, 4, 0}; static const int num_orders = ARRAY_SIZE(orders);