The commit is pushed to "branch-rh7-3.10.0-123.1.2-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git after rh7-3.10.0-123.1.2.el7.ovz.4.8 ------> commit dd56dcc8aa7e8b2426d94309d1b199e9ca40a9e9 Author: Vladimir Davydov <vdavy...@parallels.com> Date: Tue Apr 28 17:32:00 2015 +0400
mm: transcendent swap cache Transcendent swap cache (tswap) is a simple driver for frontswap, which stores reclaimed pages in memory unmodified. Its purpose is to adopt pages evicted from a memory cgroup on local pressure, so that they can be fetched back later without costly disk accesses. It works similarly to shadow gangs from PCS6 except pages has to be copied on eviction. Tswap pages are reclaimed on global pressure in the LRU order using the shrinker API. Upon eviction a tswap page is copied back to the swap cache and writeback is initiated. * Usage - To enable the frontswap backend, pass tswap.enabled=1 at boot. - To activate/deactivate tswap, write Y/N to /sys/module/tswap/parameters/active - To get the number of pages cached, read /sys/module/tswap/parameters/nr_pages https://jira.sw.ru/browse/PSBM-32063 Signed-off-by: Vladimir Davydov <vdavy...@parallels.com> --- config.OpenVZ | 1 + mm/Kconfig | 10 ++++++++++ mm/Makefile | 1 + 3 files changed, 12 insertions(+) diff --git a/config.OpenVZ b/config.OpenVZ index 7275b27..250b85d 100644 --- a/config.OpenVZ +++ b/config.OpenVZ @@ -5290,6 +5290,7 @@ CONFIG_HAVE_ARCH_SOFT_DIRTY=y CONFIG_MEM_SOFT_DIRTY=y CONFIG_TCACHE=y +CONFIG_TSWAP=y # # User resources diff --git a/mm/Kconfig b/mm/Kconfig index d91c9a6..e3c7f58 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -531,3 +531,13 @@ config TCACHE stores reclaimed pages in memory without any modifications. It is only worth enabling if used along with memory cgroups in order to cache pages which were reclaimed on local pressure. + +config TSWAP + bool "Transcendent swap cache" + depends on FRONTSWAP + default n + help + Transcendent swap cache is a simple backend for frontswap, which + stores reclaimed pages in memory without any modifications. It is + only worth enabling if used along with memory cgroups in order to + cache pages which were reclaimed on local pressure. diff --git a/mm/Makefile b/mm/Makefile index a9b1f75..cb994a6 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -62,3 +62,4 @@ obj-$(CONFIG_CLEANCACHE) += cleancache.o obj-$(CONFIG_MEMORY_ISOLATION) += page_isolation.o obj-$(CONFIG_ZBUD) += zbud.o obj-$(CONFIG_TCACHE) += tcache.o +obj-$(CONFIG_TSWAP) += tswap.o _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel