staging: zcache: reduce tmem bucket lock contention

[pandora-kernel.git] / drivers / staging / zcache / zcache-main.c

diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c
index dae2f4e..22b0a75 100644 (file)
--- a/drivers/staging/zcache/zcache-main.c
+++ b/drivers/staging/zcache/zcache-main.c
@@ -1804,8 +1804,10 @@ static int zcache_frontswap_poolid = -1;
 /*
  * Swizzling increases objects per swaptype, increasing tmem concurrency
  * for heavy swaploads.  Later, larger nr_cpus -> larger SWIZ_BITS
+ * Setting SWIZ_BITS to 27 basically reconstructs the swap entry from
+ * frontswap_get_page()
  */
-#define SWIZ_BITS              4
+#define SWIZ_BITS              27
 #define SWIZ_MASK              ((1 << SWIZ_BITS) - 1)
 #define _oswiz(_type, _ind)    ((_type << SWIZ_BITS) | (_ind & SWIZ_MASK))
 #define iswiz(_ind)            (_ind >> SWIZ_BITS)