diff options
Diffstat (limited to 'init/Kconfig')
| -rw-r--r-- | init/Kconfig | 44 |
1 files changed, 35 insertions, 9 deletions
diff --git a/init/Kconfig b/init/Kconfig index af09b4fb43d2..2c0e50ef554a 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -538,15 +538,6 @@ config RCU_STALL_COMMON config CONTEXT_TRACKING bool -config RCU_USER_QS - bool - help - This option sets hooks on kernel / userspace boundaries and - puts RCU in extended quiescent state when the CPU runs in - userspace. It means that when a CPU runs in userspace, it is - excluded from the global RCU state machine and thus doesn't - try to keep the timer tick on for RCU. - config CONTEXT_TRACKING_FORCE bool "Force context tracking" depends on CONTEXT_TRACKING @@ -707,6 +698,7 @@ config RCU_BOOST_DELAY config RCU_NOCB_CPU bool "Offload RCU callback processing from boot-selected CPUs" depends on TREE_RCU || PREEMPT_RCU + depends on RCU_EXPERT || NO_HZ_FULL default n help Use this option to reduce OS jitter for aggressive HPC or @@ -891,6 +883,16 @@ config ARCH_SUPPORTS_NUMA_BALANCING bool # +# For architectures that prefer to flush all TLBs after a number of pages +# are unmapped instead of sending one IPI per page to flush. The architecture +# must provide guarantees on what happens if a clean TLB cache entry is +# written after the unmap. Details are in mm/rmap.c near the check for +# should_defer_flush. The architecture should also consider if the full flush +# and the refill costs are offset by the savings of sending fewer IPIs. +config ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH + bool + +# # For architectures that know their GCC __int128 support is sound # config ARCH_SUPPORTS_INT128 @@ -955,6 +957,22 @@ config CGROUP_FREEZER Provides a way to freeze and unfreeze all tasks in a cgroup. +config CGROUP_PIDS + bool "PIDs cgroup subsystem" + help + Provides enforcement of process number limits in the scope of a + cgroup. Any attempt to fork more processes than is allowed in the + cgroup will fail. PIDs are fundamentally a global resource because it + is fairly trivial to reach PID exhaustion before you reach even a + conservative kmemcg limit. As a result, it is possible to grind a + system to halt without being limited by other cgroup policies. The + PIDs cgroup subsystem is designed to stop this from happening. + + It should be noted that organisational operations (such as attaching + to a cgroup hierarchy will *not* be blocked by the PIDs subsystem), + since the PIDs limit only affects a process's ability to fork, not to + attach to a cgroup. + config CGROUP_DEVICE bool "Device controller for cgroups" help @@ -1568,6 +1586,14 @@ config ADVISE_SYSCALLS applications use these syscalls, you can disable this option to save space. +config USERFAULTFD + bool "Enable userfaultfd() system call" + select ANON_INODES + depends on MMU + help + Enable the userfaultfd() system call that allows to intercept and + handle page faults in userland. + config PCI_QUIRKS default y bool "Enable PCI quirk workarounds" if EXPERT |