diff options
Diffstat (limited to 'mm/Kconfig')
| -rw-r--r-- | mm/Kconfig | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/mm/Kconfig b/mm/Kconfig index f2f1ca19ed53..1dbbf178c44c 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -370,3 +370,20 @@ config CLEANCACHE in a negligible performance hit. If unsure, say Y to enable cleancache + +config FRONTSWAP + bool "Enable frontswap pseudo-RAM driver to cache swap pages" + depends on SWAP + default n + help + Frontswap is so named because it can be thought of as the opposite of + a "backing" store for a swap device. The storage is assumed to be + a synchronous concurrency-safe page-oriented pseudo-RAM device (such + as Xen's Transcendent Memory, aka "tmem") which is not directly + accessible or addressable by the kernel and is of unknown (and + possibly time-varying) size. When a pseudo-RAM device is available, + a signficant swap I/O reduction may be achieved. When none is + available, all frontswap calls are reduced to a single pointer- + compare-against-NULL resulting in a negligible performance hit. + + If unsure, say Y to enable frontswap. |