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scx-upstream/meson.build
Tejun Heo 43950c65bd build: Use workspace to group rust sub-projects 
meson build script was building each rust sub-project under rust/ and
scheds/rust/ separately. This means that each rust project is built
independently which leads to a couple problems - 1. There are a lot of
shared dependencies but they have to be built over and over again for each
proejct. 2. Concurrency management becomes sad - we either have to unleash
multiple cargo builds at the same time possibly thrashing the system or
build one by one.

We've been trying to solve this from meson side in vain. Thankfully, in
issue #546, @vimproved suggested using cargo workspace which makes the
sub-projects share the same target directory and built together by the same
cargo instance while still allowing each project to behave independently for
development and publishing purposes.

Make the following changes:

- Create two cargo workspaces - one under rust/, the other under
  scheds/rust/. Each contains all rust projects underneath it.

- Don't let meson descend into rust/. These are libraries used by the rust
  schedulers. No need to build them from meson. Cargo will build them as
  needed.

- Change the rust_scheds build target to invoke `cargo build` in
  scheds/rust/ and let cargo do its thing.

- Remove per-scheduler meson.build files and instead generate custom_targets
  in scheds/rust/meson.build which invokes `cargo build -p $SCHED`.

- This changes rust binary directory. Update README and
  meson-scripts/install_rust_user_scheds accordingly.

- Remove per-scheduler Cargo.lock as scheds/rust/Cargo.lock is shared by all
  schedulers now.

- Unify .gitignore handling.

The followings are build times on Ryzen 3975W:

Before:
  ________________________________________________________
  Executed in  165.93 secs    fish           external
     usr time   40.55 mins    2.71 millis   40.55 mins
     sys time    3.34 mins   36.40 millis    3.34 mins

After:
  ________________________________________________________
  Executed in   36.04 secs    fish           external
     usr time  336.42 secs    0.00 millis  336.42 secs
     sys time   36.65 secs   43.95 millis   36.61 secs

Wallclock time is reduced 5x and CPU time 7x.
2024-08-25 00:47:58 -10:00

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Meson
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project('sched_ext schedulers', 'c',
version: '1.0.3',
license: 'GPL-2.0',)
if meson.version().version_compare('<1.2')
error('meson >= 1.2 required')
endif
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')
if enable_rust
cargo = find_program(get_option('cargo'))
endif
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'))
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'))
if enable_rust
cargo_fetch = find_program(join_paths(meson.current_source_dir(),
'meson-scripts/cargo_fetch'))
endif
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]
libbpf_local_h += ['.@0@/libbpf'.format(local_build_path) + path]
endforeach
message('Fetching libbpf repo')
libbpf_commit = '686f600bca59e107af4040d0838ca2b02c14ff50'
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 = '77a72987353fcae8ce330fd87d4c7afb7677a169'
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 < 4)
error('bpftool >= 7.4 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
#
# Generators to build BPF skel file for C schedulers.
#
gen_bpf_o = generator(bpf_clang,
output: '@BASENAME@.o',
depends: [libbpf],
arguments: [bpf_base_cflags, '-target', 'bpf', libbpf_c_headers, '@EXTRA_ARGS@',
'-c', '@INPUT@', '-o', '@OUTPUT@'])
gen_bpf_skel = generator(bpftool_build_skel,
output: ['@BASENAME@.skel.h','@BASENAME@.subskel.h' ],
depends: [libbpf, bpftool_target],
arguments: [bpftool_exe_path, '@INPUT@', '@OUTPUT0@', '@OUTPUT1@'])
#
# 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
cargo_env = environment()
cargo_env.set('BPF_CLANG', bpf_clang.full_path())
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
if enable_rust
meson.add_install_script('meson-scripts/install_rust_user_scheds')
run_target('fetch', command: [cargo_fetch, cargo], env: cargo_env)
endif
if get_option('kernel') != ''
kernel = get_option('kernel')
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')])
run_target('veristat_diff', command: [run_veristat_diff, meson.current_build_dir(),
get_option('veristat_scheduler'), get_option('kernel'),
get_option('veristat_diff_dir')])
subdir('scheds')
if enable_stress
run_target('stress_tests', command: [run_stress_tests, '-k', kernel, '-b',
meson.current_build_dir()])
endif
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
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