diff options
Diffstat (limited to 'init/Kconfig')
| -rw-r--r-- | init/Kconfig | 71 |
1 files changed, 51 insertions, 20 deletions
diff --git a/init/Kconfig b/init/Kconfig index b170aa1d43b..ebe04f56d83 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -80,16 +80,20 @@ config LOCALVERSION_AUTO default y help This will try to automatically determine if the current tree is a - release tree by looking for git tags that - belong to the current top of tree revision. + release tree by looking for git tags that belong to the current + top of tree revision. A string of the format -gxxxxxxxx will be added to the localversion - if a git based tree is found. The string generated by this will be + if a git-based tree is found. The string generated by this will be appended after any matching localversion* files, and after the value - set in CONFIG_LOCALVERSION + set in CONFIG_LOCALVERSION. - Note: This requires Perl, and a git repository, but not necessarily - the git or cogito tools to be installed. + (The actual string used here is the first eight characters produced + by running the command: + + $ git rev-parse --verify HEAD + + which is done within the script "scripts/setlocalversion".) config SWAP bool "Support for paging of anonymous memory (swap)" @@ -352,7 +356,7 @@ menuconfig EMBEDDED config UID16 bool "Enable 16-bit UID system calls" if EMBEDDED - depends on ARM || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && SPARC32_COMPAT) || UML || (X86_64 && IA32_EMULATION) + depends on ARM || BFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && SPARC32_COMPAT) || UML || (X86_64 && IA32_EMULATION) default y help This enables the legacy 16-bit UID syscall wrappers. @@ -474,15 +478,6 @@ config SHMEM option replaces shmem and tmpfs with the much simpler ramfs code, which may be appropriate on small systems without swap. -config SLAB - default y - bool "Use full SLAB allocator" if (EMBEDDED && !SMP && !SPARSEMEM) - help - Disabling this replaces the advanced SLAB allocator and - kmalloc support with the drastically simpler SLOB allocator. - SLOB is more space efficient but does not scale well and is - more susceptible to fragmentation. - config VM_EVENT_COUNTERS default y bool "Enable VM event counters for /proc/vmstat" if EMBEDDED @@ -492,6 +487,46 @@ config VM_EVENT_COUNTERS on EMBEDDED systems. /proc/vmstat will only show page counts if VM event counters are disabled. +choice + prompt "Choose SLAB allocator" + default SLAB + help + This option allows to select a slab allocator. + +config SLAB + bool "SLAB" + help + The regular slab allocator that is established and known to work + well in all environments. It organizes chache hot objects in + per cpu and per node queues. SLAB is the default choice for + slab allocator. + +config SLUB + depends on EXPERIMENTAL && !ARCH_USES_SLAB_PAGE_STRUCT + bool "SLUB (Unqueued Allocator)" + help + SLUB is a slab allocator that minimizes cache line usage + instead of managing queues of cached objects (SLAB approach). + Per cpu caching is realized using slabs of objects instead + of queues of objects. SLUB can use memory efficiently + way and has enhanced diagnostics. + +config SLOB +# +# SLOB cannot support SMP because SLAB_DESTROY_BY_RCU does not work +# properly. +# + depends on EMBEDDED && !SMP && !SPARSEMEM + bool "SLOB (Simple Allocator)" + help + SLOB replaces the SLAB allocator with a drastically simpler + allocator. SLOB is more space efficient that SLAB but does not + scale well (single lock for all operations) and is more susceptible + to fragmentation. SLOB it is a great choice to reduce + memory usage and code size for embedded systems. + +endchoice + endmenu # General setup config RT_MUTEXES @@ -507,10 +542,6 @@ config BASE_SMALL default 0 if BASE_FULL default 1 if !BASE_FULL -config SLOB - default !SLAB - bool - menu "Loadable module support" config MODULES |