projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| faca2ef7 DM |
1 | config ZCACHE2 |
| 2 | bool "Dynamic compression of swap pages and clean pagecache pages" | |
| 3 | depends on CRYPTO=y && SWAP=y && CLEANCACHE && FRONTSWAP && !ZCACHE | |
| 4 | select CRYPTO_LZO | |
| 5 | default n | |
| 6 | help | |
| 7 | Zcache2 doubles RAM efficiency while providing a significant | |
| 8 | performance boosts on many workloads. Zcache2 uses | |
| 9 | compression and an in-kernel implementation of transcendent | |
| 10 | memory to store clean page cache pages and swap in RAM, | |
| 11 | providing a noticeable reduction in disk I/O. Zcache2 | |
| 12 | is a complete rewrite of the older zcache; it was intended to | |
| 13 | be a merge but that has been blocked due to political and | |
| 14 | technical disagreements. It is intended that they will merge | |
| 15 | again in the future. Until then, zcache2 is a single-node | |
| 16 | version of ramster. | |
| 14c9fda5 DM |
17 | |
| 18 | config RAMSTER | |
| 19 | bool "Cross-machine RAM capacity sharing, aka peer-to-peer tmem" | |
| 20 | depends on CONFIGFS_FS=y && SYSFS=y && !HIGHMEM && ZCACHE2=y | |
| 21 | # must ensure struct page is 8-byte aligned | |
| 22 | select HAVE_ALIGNED_STRUCT_PAGE if !64_BIT | |
| 23 | default n | |
| 24 | help | |
| 25 | RAMster allows RAM on other machines in a cluster to be utilized | |
| 26 | dynamically and symmetrically instead of swapping to a local swap | |
| 27 | disk, thus improving performance on memory-constrained workloads | |
| 28 | while minimizing total RAM across the cluster. RAMster, like | |
| 29 | zcache2, compresses swap pages into local RAM, but then remotifies | |
| 30 | the compressed pages to another node in the RAMster cluster. |