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meson.build
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project('sched_ext schedulers', 'c',
version: '1.0.8',
license: 'GPL-2.0',
meson_version : '>= 1.2.0',)
fs = import('fs')
cc = meson.get_compiler('c')
enable_rust = get_option('enable_rust')
bpf_clang = find_program(get_option('bpf_clang'))
run_veristat = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/veristat'))
run_veristat_diff = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/veristat_diff'))
enable_stress = get_option('enable_stress')
veristat_scheduler = get_option('veristat_scheduler')
veristat_diff_dir = get_option('veristat_diff_dir')
build_outside_src = get_option('build_outside_src')
if enable_stress
run_stress_tests = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/run_stress_tests'))
endif
get_clang_ver = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/get_clang_ver'))
get_bpftool_ver = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/get_bpftool_ver'))
bpftool_build_skel = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/bpftool_build_skel'))
bpftool_build_skel_lib = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/bpftool_build_skel_lib'))
get_sys_incls = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/get_sys_incls'))
test_sched = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/test_sched'))
fetch_libbpf = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/fetch_libbpf'))
build_libbpf = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/build_libbpf'))
fetch_bpftool = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/fetch_bpftool'))
build_bpftool = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/build_bpftool'))
scx_lib_name = 'lib'
scx_lib_path = join_paths(meson.current_build_dir(), 'lib/', scx_lib_name)
compile_scx_lib = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/compile_scx_lib'))
bpf_clang_ver = run_command(get_clang_ver, bpf_clang, check: true).stdout().strip()
if bpf_clang_ver == ''
error('Unable to find clang version')
endif
bpf_clang_maj = bpf_clang_ver.split('.')[0].to_int()
if bpf_clang_maj < 16
error('clang < 16 loses high 32 bits of 64 bit enums when compiling BPF (@0@ ver=@1@)'
.format(bpf_clang.full_path(), bpf_clang_ver))
elif bpf_clang_maj < 17
warning('clang >= 17 recommended (@0@ ver=@1@)'
.format(bpf_clang.full_path(), bpf_clang_ver))
endif
# These are for building libbpf and/or bpftool
if meson.get_compiler('c').get_id() == 'gcc'
extra_args = ['-Wno-sign-compare', '-Wno-maybe-uninitialized', '-Wno-calloc-transposed-args']
else
extra_args = []
endif
executable('cc_cflags_probe', 'meson-scripts/cc_cflags_probe.c', install: false, pie: true, c_args : extra_args)
jq = find_program('jq')
make = find_program('make')
nproc = find_program('nproc')
make_jobs = 1
if nproc.found()
make_jobs = run_command(nproc, check: true).stdout().to_int()
endif
libbpf_path = '@0@/libbpf'.format(meson.current_build_dir())
libbpf_src_path = '@0@/src'.format(libbpf_path)
libbpf_a = '@0@/libbpf.a'.format(libbpf_src_path)
should_build_libbpf = true
libbpf_h = get_option('libbpf_h')
libbpf_local_h = get_option('libbpf_h')
if get_option('libbpf_a') == 'disabled'
libbpf_a = ''
should_build_libbpf = false
elif get_option('libbpf_a') != ''
libbpf_a = get_option('libbpf_a')
if not fs.exists(libbpf_a)
error('@0@ does not exist.'.format(libbpf_a))
endif
should_build_libbpf = false
endif
# WARNING! To build libbpf with the same compiler(CC) and CFLAGS
# as the schedulers we need to do this hack whereby we create a dummy exe
# then read the compiler and args from meson's compile_commands.json
# and re-set them when we build libbpf with make
if should_build_libbpf
if not jq.found() or not make.found()
error('To build the libbpf library "make" and "jq" are required')
endif
libbpf_header_paths = ['/src/usr/include', '/include/uapi']
libbpf_h = []
# This exists because meson doesn't like absolute paths for include_directories
# if they are found within the same directory as the source
libbpf_local_h = []
local_build_path = meson.current_build_dir().replace(meson.current_source_dir(), '')
foreach path : libbpf_header_paths
libbpf_h += ['@0@'.format(libbpf_path) + path]
if not build_outside_src
libbpf_local_h += ['.@0@/libbpf'.format(local_build_path) + path]
else
libbpf_local_h += ['@0@/libbpf'.format(local_build_path) + path]
endif
endforeach
message('Fetching libbpf repo')
libbpf_commit = 'c5f22aca0f3aa855daa159b2777472b35e721804'
run_command(fetch_libbpf, meson.current_build_dir(), libbpf_commit, check: true)
make_jobs = 1
if nproc.found()
make_jobs = run_command(nproc, check: true).stdout().to_int()
endif
libbpf = custom_target('libbpf',
output: '@PLAINNAME@.__PHONY__',
input: 'meson-scripts/cc_cflags_probe.c',
command: [build_libbpf, jq, make, libbpf_src_path, '@0@'.format(make_jobs)],
build_by_default: true)
else
# this is a noop when we're not building libbpf ourselves
libbpf = custom_target('libbpf',
output: '@PLAINNAME@.__PHONY__',
input: 'meson-scripts/cc_cflags_probe.c',
command: ['echo'],
build_by_default: true)
endif
if libbpf_a != ''
libbpf_dep = [declare_dependency(
link_args: libbpf_a,
include_directories: libbpf_local_h),
cc.find_library('elf'),
cc.find_library('z'),
cc.find_library('zstd')]
else
libbpf_dep = dependency('libbpf', version: '>=1.4')
endif
if get_option('kernel_headers') != ''
kernel_headers = get_option('kernel_headers')
kernel_dep = [declare_dependency(include_directories: kernel_headers)]
else
kernel_dep = []
endif
bpftool_path = '@0@/bpftool/src'.format(meson.current_build_dir())
should_build_bpftool = true
bpftool_exe_path = '@0@/bpftool'.format(bpftool_path)
if get_option('bpftool') == 'disabled'
bpftool = find_program('bpftool')
should_build_bpftool = false
bpftool_exe_path = bpftool.full_path()
elif get_option('bpftool') != ''
bpftool = find_program(get_option('bpftool'))
should_build_bpftool = false
bpftool_exe_path = bpftool.full_path()
endif
if should_build_bpftool
message('Fetching bpftool repo')
bpftool_commit = '183e7010387d1fc9f08051426e9a9fbd5f8d409e'
run_command(fetch_bpftool, meson.current_build_dir(), bpftool_commit, check: true)
bpftool_target = custom_target('bpftool_target',
output: '@PLAINNAME@.__PHONY__',
input: 'meson-scripts/bpftool_dummy.c',
command: [build_bpftool, jq, make, bpftool_path, '@0@'.format(make_jobs)],
build_by_default: true)
else
bpftool_ver = run_command(get_bpftool_ver, bpftool_exe_path, check: true).stdout().strip()
bpftool_maj = bpftool_ver.split('.')[0].to_int()
bpftool_min = bpftool_ver.split('.')[1].to_int()
if bpftool_maj < 7 or (bpftool_maj == 7 and bpftool_min < 5)
error('bpftool >= 7.5 required (@0@ ver=@1@)'.format(bpftool_exe_path, bpftool_ver))
endif
# this is a noop when we're not building bpftool ourselves
bpftool_target = custom_target('bpftool_target',
output: '@PLAINNAME@.__PHONY__',
input: 'meson-scripts/bpftool_dummy.c',
command: ['echo'],
build_by_default: true)
endif
# end libbpf/bpftool stuff
#
# Determine bpf_base_cflags which will be used to compile all .bpf.o files.
# Note that "-target bpf" is not included to accommodate
# libbpf_cargo::SkeletonBuilder.
#
# Map https://mesonbuild.com/Reference-tables.html#cpu-families to the
# __TARGET_ARCH list in tools/lib/bpf/bpf_tracing.h in the kernel tree.
#
arch_dict = {
'x86': 'x86',
'x86_64': 'x86',
's390x': 's390',
'arm': 'arm',
'aarch64': 'arm64',
'mips': 'mips',
'mips64': 'mips',
'ppc': 'powerpc',
'ppc64': 'powerpc',
'sparc': 'sparc',
'sparc64': 'sparc',
'riscv32': 'riscv',
'riscv64': 'riscv',
'arc': 'arc',
'loongarch64': 'loongarch'
}
cpu = host_machine.cpu_family()
if cpu not in arch_dict
error('CPU family "@0@" is not in known arch dict'.format(cpu))
endif
sys_incls = run_command(get_sys_incls, bpf_clang, check: true).stdout().splitlines()
bpf_base_cflags = ['-g', '-O2', '-Wall', '-Wno-compare-distinct-pointer-types',
'-D__TARGET_ARCH_' + arch_dict[cpu], '-mcpu=v3',
'-m@0@-endian'.format(host_machine.endian())] + sys_incls
if get_option('werror')
bpf_base_cflags += '-Werror'
endif
message('cpu=@0@ bpf_base_cflags=@1@'.format(cpu, bpf_base_cflags))
libbpf_c_headers = []
if libbpf_a != ''
foreach header: libbpf_h
libbpf_c_headers += ['-I', header]
endforeach
endif
# BPF compilation uses the gen_bpf_o generator. The following should be
# passed in as extra_args.
bpf_includes = ['-I', join_paths(meson.current_source_dir(), 'scheds/include'),
'-I', join_paths(meson.current_source_dir(), 'scheds/include/arch/' + arch_dict[cpu]),
'-I', join_paths(meson.current_source_dir(), 'scheds/include/bpf-compat'),
'-I', join_paths(meson.current_source_dir(), 'scheds/include/lib'),]
lib_objs = []
subdir('lib')
#
# Generators to build BPF skel file for C schedulers.
#
gen_bpf_o = generator(bpf_clang,
output: '@[email protected]',
depends: [libbpf],
arguments: [bpf_base_cflags, '-target', 'bpf', libbpf_c_headers, bpf_includes,
'-c', '@INPUT@', '-o', '@OUTPUT@'])
gen_bpf_skel = generator(bpftool_build_skel,
output: ['@[email protected]','@[email protected]' ],
depends: [libbpf, bpftool_target],
arguments: [bpftool_exe_path, '@INPUT@', '@OUTPUT0@', '@OUTPUT1@'])
gen_bpf_skel_lib = generator(bpftool_build_skel_lib,
output: ['@[email protected]','@[email protected]' ],
depends: [libbpf, bpftool_target, scx_lib],
arguments: [bpftool_exe_path, '@INPUT@', '@OUTPUT0@', '@OUTPUT1@', scx_lib_path])
#
# For rust sub-projects.
#
cargo_build_args = ['--quiet']
if get_option('buildtype') == 'release' or get_option('buildtype') == 'plain'
cargo_build_args += '--release'
endif
if get_option('offline')
cargo_build_args += '--offline'
endif
if get_option('kernel') != ''
kernel = get_option('kernel')
endif
if enable_rust
cargo = find_program(get_option('cargo'))
cargo_fetch = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/cargo_fetch'))
cargo_env = environment()
cargo_env.set('BPF_CLANG', bpf_clang.full_path())
meson.add_install_script('meson-scripts/install_rust_user_scheds')
foreach flag: bpf_base_cflags
cargo_env.append('BPF_BASE_CFLAGS', flag, separator: ' ')
endforeach
if libbpf_a != ''
foreach header: libbpf_h
cargo_env.append('BPF_EXTRA_CFLAGS_PRE_INCL', '-I' + header, separator: ' ')
endforeach
cargo_env.append('RUSTFLAGS',
'-C relocation-model=pic -C link-args=-lelf -C link-args=-lz -C link-args=-lzstd -L '
+ fs.parent(libbpf_a), separator: ' ')
#
# XXX - scx_rusty's original Cargo.toml contained a dependency matching
# the following. However, it doesn't seem necessary to enable linking to
# libbpf.a. Ask Dan Schatzberg about the role the dependency line plays.
#
#cargo_build_args += ['--config',
# 'dependencies.libbpf-sys.version="1.2"',
# '--config',
# 'dependencies.libbpf-sys.features=["novendor", "static"]']
endif
if get_option('cargo_home') != ''
cargo_env.set('CARGO_HOME', get_option('cargo_home'))
endif
run_target('fetch', command: [cargo_fetch, cargo], env: cargo_env)
rust_scheds = ['scx_lavd', 'scx_bpfland', 'scx_rustland', 'scx_rlfifo',
'scx_flash', 'scx_rusty',
'scx_layered', 'scx_mitosis']
rust_misc = ['scx_stats', 'scx_stats_derive', 'scx_utils',
'scx_rustland_core',
'scx_loader']
sched_deps = [libbpf, bpftool_target]
cargo_cmd = [cargo, 'build', '--manifest-path=@INPUT@', '--target-dir=@OUTDIR@',
cargo_build_args]
# target to compile all rust subprojects
custom_target('rust_all',
output: '@PLAINNAME@.__PHONY__',
input: 'Cargo.toml',
command: cargo_cmd,
env: cargo_env,
depends: sched_deps,
build_by_default: true,
build_always_stale: true)
# targets to build individual rust subprojects
foreach p : rust_scheds + rust_misc
custom_target(p,
output: p + '@PLAINNAME@.__PHONY__',
input: 'Cargo.toml',
command: cargo_cmd + ['-p', p],
env: cargo_env,
depends: sched_deps,
build_by_default: false,
build_always_stale: true)
endforeach
else
rust_scheds = []
endif
run_target('test_sched', command: [test_sched, kernel])
run_target('veristat', command: [run_veristat, meson.current_build_dir(),
get_option('veristat_scheduler'), get_option('kernel')])
if get_option('vng_rw_mount') == true
foreach s : rust_scheds
run_target('test_sched_'+s, command: [test_sched, kernel, s, 'VNG_RW=true'])
run_target('veristat_'+s, command: [run_veristat, meson.current_build_dir(),
get_option('veristat_scheduler'), get_option('kernel'), s, 'VNG_RW=true'])
endforeach
else
foreach s : rust_scheds
run_target('test_sched_'+s, command: [test_sched, kernel, s])
run_target('veristat_'+s, command: [run_veristat, meson.current_build_dir(),
get_option('veristat_scheduler'), get_option('kernel'), s])
endforeach
endif
run_target('veristat_diff', command: [run_veristat_diff, meson.current_build_dir(),
get_option('veristat_scheduler'), get_option('kernel'),
get_option('veristat_diff_dir')])
if enable_stress
# not sure there's a better way
# only different...
copys = [
custom_target('copy stress wrapper',
input : 'scripts/bpftrace_stress_wrapper.sh',
output : 'bpftrace_stress_wrapper.sh',
command : ['cp', '-a', '@INPUT@', '@OUTPUT@'],
install : false,
build_by_default : true),
custom_target('copy dsq_lat',
input : 'scripts/dsq_lat.bt',
output : 'dsq_lat.bt',
command : ['cp', '-a', '@INPUT@', '@OUTPUT@'],
install : false,
build_by_default : true),
custom_target('copy runq_lat',
input : 'scripts/process_runqlat.bt',
output : 'process_runqlat.bt',
command : ['cp', '-a', '@INPUT@', '@OUTPUT@'],
install : false,
build_by_default : true)
]
run_target('stress_tests', command: [run_stress_tests, '-k', kernel, '-b',
meson.current_build_dir()], depends: [copys])
if get_option('vng_rw_mount') == true
foreach s : rust_scheds
if get_option('kernel_headers') == ''
run_target('stress_tests_'+s, command: [run_stress_tests, '-k', kernel,
'-b', meson.current_build_dir(), '--sched', s,
'--rw', 'true',
'--extra-scheduler-args', get_option('extra_sched_args')],
depends: [copys])
else
run_target('stress_tests_'+s, command: [run_stress_tests, '-k', kernel,
'-b', meson.current_build_dir(), '--sched', s,
'--rw', 'true',
'--headers', get_option('kernel_headers'),
'--extra-scheduler-args', get_option('extra_sched_args')],
depends: [copys])
endif
endforeach
else
foreach s : rust_scheds
if get_option('kernel_headers') == ''
run_target('stress_tests_'+s, command: [run_stress_tests, '-k', kernel,
'-b', meson.current_build_dir(), '--sched', s,
'--extra-scheduler-args', get_option('extra_sched_args')],
depends: [copys])
else
run_target('stress_tests_'+s, command: [run_stress_tests, '-k', kernel,
'-b', meson.current_build_dir(), '--sched', s,
'--headers', get_option('kernel_headers'),
'--extra-scheduler-args', get_option('extra_sched_args')],
depends: [copys])
endif
endforeach
endif
endif
thread_dep = dependency('threads')
subdir('scheds')
systemd = dependency('systemd', required: get_option('systemd'))
if systemd.found()
subdir('services/systemd')
endif
openrc = dependency('openrc', required: get_option('openrc'))
if openrc.found()
subdir('services/openrc')
endif
libalpm = dependency('libalpm', required: get_option('libalpm'))
if libalpm.found() and systemd.found()
subdir('libalpm/systemd')
endif
if libalpm.found() and openrc.found()
subdir('libalpm/openrc')
endif