Lines Matching +full:cost +full:- +full:effective
1 # SPDX-License-Identifier: GPL-2.0-only
8 - Re-run Kconfig when the compiler is updated
13 - Ensure full rebuild when the compiler is updated
14 include/linux/compiler-version.h contains this option in the comment
16 auto-generated dependency. When the compiler is updated, syncconfig
20 def_bool $(success,test "$(cc-name)" = GCC)
24 default $(cc-version) if CC_IS_GCC
28 def_bool $(success,test "$(cc-name)" = Clang)
32 default $(cc-version) if CC_IS_CLANG
36 def_bool $(success,test "$(as-name)" = GNU)
39 def_bool $(success,test "$(as-name)" = LLVM)
45 default $(as-version)
48 def_bool $(success,test "$(ld-name)" = BFD)
52 default $(ld-version) if LD_IS_BFD
56 def_bool $(success,test "$(ld-name)" = LLD)
60 default $(ld-version) if LD_IS_LLD
65 default $(rustc-version)
75 Please see Documentation/rust/quick-start.rst for instructions on how
83 default $(rustc-llvm-version)
87 …default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(USERCFLAGS) $(USERLDFLA…
88 …default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(USERCFLAGS) $(USERLDFLA…
102 …nt x) { asm goto ("": "=r"(x) ::: bar); return x; bar: return 0; }' | $(CC) -x c - -c -o /dev/null)
106 # Detect buggy gcc and clang, fixed in gcc-11 clang-14.
107 …foo(int *x) { asm goto (".long (%l[bar]) - .": "+m"(*x) ::: bar); return *x; bar: return 0; }' | $…
110 …env "CC=$(CC)" "LD=$(LD)" "NM=$(NM)" "OBJCOPY=$(OBJCOPY)" $(srctree)/scripts/tools-support-relr.sh)
113 def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
116 … '__attribute__((no_profile_instrument_function)) int x();' | $(CC) -x c - -c -o /dev/null -Werror)
121 # https://github.com/llvm/llvm-project/pull/110497
122 # https://github.com/llvm/llvm-project/pull/112636
129 …[][4] __attribute__((__nonstring__)) = { };' | $(CC) $(CLANG_FLAGS) -x c - -c -o /dev/null -Werror)
133 # https://github.com/llvm/llvm-project/pull/130661
150 default $(shell,$(srctree)/scripts/pahole-version.sh $(PAHOLE))
201 drivers to compile-test them.
212 enables the '-Werror' (for C) and '-Dwarnings' (for Rust) flags
228 Compile test headers exported to user-space to ensure they are
229 self-contained, i.e. compilable as standalone units.
232 headers are self-contained, say Y here. Otherwise, choose N.
235 string "Local version - append to kernel release"
253 A string of the format -gxxxxxxxx will be added to the localversion
254 if a git-based tree is found. The string generated by this will be
261 $ git rev-parse --verify HEAD
303 The linux kernel is a kind of self-extracting executable.
353 filter (i386, x86_64, ARM, ARM64, RISC-V, big endian PowerPC,
373 LZ4 is an LZ77-type compressor with a fixed, byte-oriented encoding.
430 DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>),
479 See Documentation/core-api/watch_queue.rst
543 this also enables accounting of stolen time on logically-partitioned
556 kernel-user boundaries using the context tracking subsystem.
643 bool "Enable per-task delay accounting"
664 bool "Enable per-task storage I/O accounting"
703 common scheduling-intense workloads in practice (such as
734 on-disk kernel. This information can be extracted from the kernel
735 image file with the script scripts/extract-ikconfig and used as
751 This option enables access to the in-kernel headers that are generated during
754 kheaders.ko is built which can be loaded on-demand to get access to headers.
823 There is no additional runtime cost to printk with this enabled.
863 the precision of clamping aggregation and tracking at run-time.
868 effective value to 25%.
869 If a second 30% boosted task should be co-scheduled on the same CPU,
871 it will boost the bucket clamp effective value to 30%.
872 The clamp effective value of a bucket is reset to its nominal value
880 clamp buckets to trade off used memory for run-time tracking
891 # Not particularly useful until we get to multi-rq proxying
894 This option enables proxy execution, a mechanism for mutex-owning
900 # For architectures that want to enable the support for NUMA-affine scheduler
917 def_bool !$(cc-option,$(m64-flag) -D__SIZEOF_INT128__=0) && 64BIT
921 default "-Wimplicit-fallthrough=5" if CC_IS_GCC && $(cc-option,-Wimplicit-fallthrough=5)
922 default "-Wimplicit-fallthrough" if CC_IS_CLANG && $(cc-option,-Wunreachable-code-fallthrough)
924 # Currently, disable gcc-10+ array-bounds globally.
925 # It's still broken in gcc-13, so no upper bound yet.
933 # Currently, disable -Wstringop-overflow for GCC globally.
952 # all cpu-local but of different latencies, such as SuperH.
988 - Documentation/scheduler/sched-design-CFS.rst (CFS)
989 - Documentation/admin-guide/cgroup-v1/ (features for grouping, isolation
1004 as task migrations and controller on/offs at the cost of making
1069 See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
1107 See Documentation/scheduler/sched-bwc.rst for more information.
1116 schedule realtime tasks for non-root users until you allocate
1118 See Documentation/scheduler/sched-rt-group.rst for more information.
1160 specified task-specific clamp value is constrained by the cgroup
1209 controller includes important in-kernel memory consumers per default.
1276 This option extends the perf per-cpu mode to restrict monitoring
1308 /Documentation/admin-guide/cgroup-v2.rst.
1372 user-space use the memory control groups to limit the amount
1422 bool "Kernel->user space relay support (formerly relayfs)"
1440 etc. See <file:Documentation/admin-guide/initrd.rst> for details.
1462 See <file:Documentation/admin-guide/bootconfig.rst> for details.
1472 out even when the "bootconfig" kernel-boot parameter is omitted.
1474 make the kernel ignore the BOOT_CONFIG-supplied kernel-boot
1513 Build KUnit tests for initramfs. See Documentation/dev-tools/kunit
1520 bool "Optimize for performance (-O2)"
1523 with the "-O2" compiler flag for best performance and most
1524 helpful compile-time warnings.
1527 bool "Optimize for size (-Os)"
1529 Choosing this option will pass "-Os" to your compiler resulting
1548 depends on $(cc-option,-ffunction-sections -fdata-sections)
1549 depends on $(ld-option,--gc-sections)
1552 the linker by compiling with -ffunction-sections -fdata-sections,
1553 and linking with --gc-sections.
1555 This can reduce on disk and in-memory size of the kernel
1565 depends on $(ld-option,--orphan-handling=warn)
1566 depends on $(ld-option,--orphan-handling=error)
1583 Enable support for /proc/sys/debug/exception-trace.
1588 Enable support for /proc/sys/kernel/ignore-unaligned-usertrap
1595 Enable support for /proc/sys/kernel/unaligned-trap
1615 # Unhide debug options, to make the on-by-default options visible
1620 environments which can tolerate a "non-standard" kernel.
1624 bool "Enable 16-bit UID system calls" if EXPERT
1628 This enables the legacy 16-bit UID syscall wrappers.
1634 This option enables support for non-root users, groups and
1714 bool "Enable PC-Speaker support" if EXPERT
1719 This option allows to disable the internal PC-Speaker
1723 bool "Enable smaller-sized data structures for core" if EXPERT
1737 run glibc-based applications correctly.
1856 the cost of user-space memory barriers asymmetrically by transforming
1866 user-space with the ability to compare two processes to see if they
1879 user-space cache for the current CPU number value, which
1880 speeds up getting the current CPU number from user-space,
1881 as well as an ABI to speed up user-space operations on
1882 per-CPU data.
1922 Start self-test automatically after system startup. Suggest executing
1938 image (i.e., symbols from all sections) in cost of increased kernel
1957 A 64-bit kernel is required for the memory sealing feature.
1972 Documentation/userspace-api/mseal.rst
1999 Software events are supported either built-in or via the
2005 suffered, or branches mis-predicted - without slowing down the
2007 when a threshold number of events have passed - and can thus be
2074 This allows other Rust-related options, like drivers written in Rust,
2094 # The dummy parameter `workaround-for-0.69.0` is required to support 0.69.0
2095 # (https://github.com/rust-lang/rust-bindgen/pull/2678) and 0.71.0
2096 # (https://github.com/rust-lang/rust-bindgen/pull/3040). It can be removed
2099 default "$(shell,$(BINDGEN) --version workaround-for-0.69.0 2>/dev/null)"
2166 # macros for not-implemented syscalls in kernel/sys_ni.c and
2167 # kernel/time/posix-stubs.c. All these overrides need to be available in