X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=include%2Flinux%2Fswap.h;h=24db9142e93b0ec438c7b04983c5205e78a0c7d0;hb=ebc2a1a69111eadfeda8487e577f1a5d42ef0dae;hp=8a3c4a1caa14f501bac7d812f69ca4cc359ed0f7;hpb=edfe23dac3e2981277087b05bec7fec7790d1835;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 8a3c4a1..24db914 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -199,6 +199,16 @@ struct swap_cluster_info {
 #define CLUSTER_FLAG_NEXT_NULL 2 /* This cluster has no next cluster */
 
 /*
+ * We assign a cluster to each CPU, so each CPU can allocate swap entry from
+ * its own cluster and swapout sequentially. The purpose is to optimize swapout
+ * throughput.
+ */
+struct percpu_cluster {
+	struct swap_cluster_info index; /* Current cluster index */
+	unsigned int next; /* Likely next allocation offset */
+};
+
+/*
  * The in-memory structure used to track swap areas.
  */
 struct swap_info_struct {
@@ -217,6 +227,7 @@ struct swap_info_struct {
 	unsigned int inuse_pages;	/* number of those currently in use */
 	unsigned int cluster_next;	/* likely index for next allocation */
 	unsigned int cluster_nr;	/* countdown to next cluster search */
+	struct percpu_cluster __percpu *percpu_cluster; /* per cpu's swap location */
 	struct swap_extent *curr_swap_extent;
 	struct swap_extent first_swap_extent;
 	struct block_device *bdev;	/* swap device or bdev of swap file */