Lines Matching +full:max +full:- +full:memory +full:- +full:bandwidth
1 # SPDX-License-Identifier: GPL-2.0-only
6 default "/lib/modules/$(shell,uname -r)/.config"
7 default "/etc/kernel-config"
8 default "/boot/config-$(shell,uname -r)"
17 - Re-run Kconfig when the compiler is updated
22 - Ensure full rebuild when the compier is updated
24 fixdep adds include/config/cc/version/text.h into the auto-generated
29 def_bool $(success,echo "$(CC_VERSION_TEXT)" | grep -q gcc)
33 default $(shell,$(srctree)/scripts/gcc-version.sh $(CC)) if CC_IS_GCC
38 default $(shell,$(LD) --version | $(srctree)/scripts/ld-version.sh)
41 def_bool $(success,echo "$(CC_VERSION_TEXT)" | grep -q clang)
44 def_bool $(success,$(LD) -v | head -n 1 | grep -q LLD)
48 default $(shell,$(srctree)/scripts/clang-version.sh $(CC))
52 default $(shell,$(srctree)/scripts/lld-version.sh $(LD))
56 …default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(USERCFLAGS) $(USERLDFLA…
57 …default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(USERCFLAGS) $(USERLDFLA…
61 …efault $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(USERCFLAGS) $(USERLDFLAG…
62 …efault $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(USERCFLAGS) $(USERLDFLAG…
65 def_bool $(success,$(srctree)/scripts/gcc-goto.sh $(CC))
69 …nt x) { asm goto ("": "=r"(x) ::: bar); return x; bar: return 0; }' | $(CC) -x c - -c -o /dev/null)
73 # Detect buggy gcc and clang, fixed in gcc-11 clang-14.
74 …foo(int *x) { asm goto (".long (%l[bar]) - .": "+m"(*x) ::: bar); return *x; bar: return 0; }' | $…
77 …env "CC=$(CC)" "LD=$(LD)" "NM=$(NM)" "OBJCOPY=$(OBJCOPY)" $(srctree)/scripts/tools-support-relr.sh)
80 def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
128 drivers to compile-test them.
139 enables the '-Werror' flag to enforce that rule by default.
152 Compile test headers exported to user-space to ensure they are
153 self-contained, i.e. compilable as standalone units.
156 headers are self-contained, say Y here. Otherwise, choose N.
159 string "Local version - append to kernel release"
177 A string of the format -gxxxxxxxx will be added to the localversion
178 if a git-based tree is found. The string generated by this will be
185 $ git rev-parse --verify HEAD
227 The linux kernel is a kind of self-extracting executable.
258 Bzip2 uses a large amount of memory. For modern kernels you
277 filter (i386, x86_64, ARM, IA-64, PowerPC, and SPARC), XZ
296 LZ4 is an LZ77-type compressor with a fixed, byte-oriented encoding.
353 bool "Support for paging of anonymous memory (swap)"
359 used to provide more virtual memory than the actual RAM present
370 DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>),
489 this also enables accounting of stolen time on logically-partitioned
502 kernel-user boundaries using the context tracking subsystem.
557 command name, memory usage, controlling terminal etc. (the complete
589 bool "Enable per-task delay accounting"
610 bool "Enable per-task storage I/O accounting"
621 Collect metrics that indicate how overcommitted the CPU, memory,
625 pressure statistics files cpu, memory, and io. These will indicate
630 have cpu.pressure, memory.pressure, and io.pressure files,
648 common scheduling-intense workloads in practice (such as
683 on-disk kernel. This information can be extracted from the kernel
684 image file with the script scripts/extract-ikconfig and used as
700 This option enables access to the in-kernel headers that are generated during
703 kheaders.ko is built which can be loaded on-demand to get access to headers.
762 int "Temporary per-CPU printk log buffer size (12 => 4KB, 13 => 8KB)"
767 Select the size of an alternate printk per-CPU buffer where messages
769 be NMI messages, another one - printk recursion. The messages are
803 With this option, the user can specify the min and max CPU
804 utilization allowed for RUNNABLE tasks. The max utilization defines
808 Both min and max utilization clamp values are hints to the scheduler,
810 enforce or grant any specific bandwidth for tasks.
823 the precision of clamping aggregation and tracking at run-time.
829 If a second 30% boosted task should be co-scheduled on the same CPU,
840 clamp buckets to trade off used memory for run-time tracking
848 # For architectures that want to enable the support for NUMA-affine scheduler
865 def_bool !$(cc-option,$(m64-flag) -D__SIZEOF_INT128__=0) && 64BIT
873 # For architectures that (ab)use NUMA to represent different memory regions
874 # all cpu-local but of different latencies, such as SuperH.
880 bool "Memory placement aware NUMA scheduler"
885 This option adds support for automatic NUMA aware memory/task placement.
886 The mechanism is quite primitive and is based on migrating memory when
892 bool "Automatically enable NUMA aware memory/task placement"
904 use with process control subsystems such as Cpusets, CFS, memory
907 - Documentation/scheduler/sched-design-CFS.rst (CFS)
908 - Documentation/admin-guide/cgroup-v1/ (features for grouping, isolation
919 bool "Memory controller"
923 Provides control over the memory footprint of tasks in a cgroup.
945 control disk bandwidth allocation (proportional time slice allocation)
951 enabling proportional weight division of disk bandwidth in CFQ, set
955 See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
967 bandwidth allocation to such task groups. It uses cgroups to group
977 bool "CPU bandwidth provisioning for FAIR_GROUP_SCHED"
981 This option allows users to define CPU bandwidth rates (limits) for
985 See Documentation/scheduler/sched-bwc.rst for more information.
992 This feature lets you explicitly allocate real CPU bandwidth
994 schedule realtime tasks for non-root users until you allocate
995 realtime bandwidth for them.
996 See Documentation/scheduler/sched-rt-group.rst for more information.
1009 When this option is enabled, the user can specify a min and max
1010 CPU bandwidth which is allowed for each single task in a group.
1011 The max bandwidth allows to clamp the maximum frequency a task
1012 can use, while the min bandwidth allows to define a minimum
1016 specified task-specific clamp value is constrained by the cgroup
1054 This option affects the ORIGINAL cgroup interface. The cgroup2 memory
1055 controller includes important in-kernel memory consumers per default.
1081 Memory Nodes and assigning tasks to run only within those sets.
1107 This option extends the perf per-cpu mode to restrict monitoring
1189 user-space use the memory control groups to limit the amount
1190 of memory a memory unprivileged users can use.
1287 bool "Kernel->user space relay support (formerly relayfs)"
1305 etc. See <file:Documentation/admin-guide/initrd.rst> for details.
1332 initcall_nr_threads=-1, auto selected the number of threads.
1342 See <file:Documentation/admin-guide/bootconfig.rst> for details.
1351 bool "Optimize for performance (-O2)"
1354 with the "-O2" compiler flag for best performance and most
1355 helpful compile-time warnings.
1358 bool "Optimize more for performance (-O3)"
1361 Choosing this option will pass "-O3" to your compiler to optimize
1365 bool "Optimize for size (-Os)"
1367 Choosing this option will pass "-Os" to your compiler resulting
1386 depends on $(cc-option,-ffunction-sections -fdata-sections)
1387 depends on $(ld-option,--gc-sections)
1390 the linker by compiling with -ffunction-sections -fdata-sections,
1391 and linking with --gc-sections.
1393 This can reduce on disk and in-memory size of the kernel
1404 depends on $(ld-option,--orphan-handling=warn)
1415 Enable support for /proc/sys/debug/exception-trace.
1420 Enable support for /proc/sys/kernel/ignore-unaligned-usertrap
1427 Enable support for /proc/sys/kernel/unaligned-trap
1441 # Unhide debug options, to make the on-by-default options visible
1446 environments which can tolerate a "non-standard" kernel.
1450 bool "Enable 16-bit UID system calls" if EXPERT
1454 This enables the legacy 16-bit UID syscall wrappers.
1460 This option enables support for non-root users, groups and
1555 bool "Enable PC-Speaker support" if EXPERT
1560 This option allows to disable the internal PC-Speaker
1561 support, saving some memory.
1565 bool "Enable full-sized data structures for core" if EXPERT
1568 kernel data structures. This saves memory on small machines,
1578 run glibc-based applications correctly.
1632 The shmem is an internal filesystem used to manage shared memory.
1660 applications to advise the kernel about their future memory or file
1679 Enable the membarrier() system call that allows issuing memory
1681 the cost of user-space memory barriers asymmetrically by transforming
1682 pairs of memory barriers into pairs consisting of membarrier() and a
1723 emit the symbol references in the kallsyms table as 32-bit entries,
1730 On 64-bit builds, this reduces the size of the address table by 50%,
1804 user-space with the ability to compare two processes to see if they
1806 memory space.
1817 user-space cache for the current CPU number value, which
1818 speeds up getting the current CPU number from user-space,
1819 as well as an ABI to speed up user-space operations on
1820 per-CPU data.
1871 Software events are supported either built-in or via the
1877 suffered, or branches mis-predicted - without slowing down the
1879 when a threshold number of events have passed - and can thus be
1896 Use vmalloc memory to back perf mmap() buffers.
1935 allocation cache to host info and debug files. If memory
1936 cgroup is enabled, each cache can have per memory cgroup
1953 On non-ancient distros (post-2000 ones) N is usually a safe choice.
1976 of queues of objects. SLUB can use memory efficiently
1994 For reduced kernel memory fragmentation, slab caches can be
2020 sanity-checking than others. This option is most effective with
2028 utilization of a direct-mapped memory-side-cache. See section
2029 5.2.27 Heterogeneous Memory Attribute Table (HMAT) in the ACPI
2031 the presence of a memory-side-cache. There are also incidental
2034 default granularity of shuffling on the "MAX_ORDER - 1" i.e,
2041 after runtime detection of a direct-mapped memory-side-cache.
2059 bool "Allow mmapped anonymous memory to be uninitialized"
2063 Normally, and according to the Linux spec, anonymous memory obtained
2071 ELF-FDPIC binfmt's brk and stack allocator.
2075 userspace. Since that isn't generally a problem on no-MMU systems,
2078 See Documentation/admin-guide/mm/nommu-mmap.rst for more information.
2155 --force). Forced module loading sets the 'F' (forced) taint flag and
2172 without waiting for anyone to stop using it (using the -f option to
2229 <file:Documentation/admin-guide/module-signing.rst>.
2237 another LSM - otherwise unsigned modules will be loadable regardless
2258 modules must be signed manually, using the scripts/sign-file tool.
2260 comment "Do not forget to sign required modules with scripts/sign-file"
2274 bool "Sign modules with SHA-1"
2278 bool "Sign modules with SHA-224"
2282 bool "Sign modules with SHA-256"
2286 bool "Sign modules with SHA-384"
2290 bool "Sign modules with SHA-512"
2311 module-init-tools MAY support gzip, and kmod MAY support gzip and xz.
2313 Out-of-tree kernel modules installed using Kbuild will also be
2384 If unsure, or if you need to build out-of-tree modules, say N.
2390 By default, all unused exported symbols will be un-exported from the
2394 exported at all times, even in absence of in-tree users. The value to
2443 # macros for not-implemented syscalls in kernel/sys_ni.c and
2444 # kernel/time/posix-stubs.c. All these overrides need to be available in