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 $SCHED`. - This changes rust binary directory. Update README and meson-scripts/install_rust_user_scheds accordingly. - Remove per-scheduler Cargo.lock as scheds/rust/Cargo.lock is shared by all schedulers now. - Unify .gitignore handling. The followings are build times on Ryzen 3975W: Before: ________________________________________________________ Executed in 165.93 secs fish external usr time 40.55 mins 2.71 millis 40.55 mins sys time 3.34 mins 36.40 millis 3.34 mins After: ________________________________________________________ Executed in 36.04 secs fish external usr time 336.42 secs 0.00 millis 336.42 secs sys time 36.65 secs 43.95 millis 36.61 secs Wallclock time is reduced 5x and CPU time 7x.
2024-11-25 12:10:24 +00:00 · 2024-08-25 00:03:41 -10:00 · 2024-08-25 00:03:41 -10:00 · 43950c65bd
commit 43950c65bd
parent c93191a213
36 changed files with 191 additions and 9969 deletions
--- a/README.md
+++ b/README.md
@ -244,9 +244,7 @@ For example, here, the `scx_simple` binary can be found at
 `$SCX/build/scheds/c/scx_simple`.

 For Rust userspace schedulers such as the ones under `scheds/rust`, the
-same directory under the build root is used as the cargo build target
-directory. Thus, here, the `scx_rusty` binary can be found at
-`$SCX/build/scheds/rust/scx_rusty/release/scx_rusty`.
+`scx_rusty` binary can be found at `$SCX/build/scheds/rust/release`.


 ### SCX specific build options
@ -264,7 +262,6 @@ options can be used in such cases.
 - 'cargo_home': 'CARGO_HOME env to use when invoking cargo'
 - `offline`: 'Compilation step should not access the internet'
 - `enable_rust`: 'Enable the build of rust sub-projects'
- `serialize`: 'Enable/disable the sequential build of the schedulers. Set this to false if you need to build just one scheduler.'

 For example, let's say you want to use `bpftool` and `libbpf` shipped in the
 kernel tree located at `$KERNEL`. We need to build `bpftool` in the kernel
--- a/meson-scripts/install_rust_user_scheds
+++ b/meson-scripts/install_rust_user_scheds
@ -4,8 +4,8 @@ set -e

 for manifest in "$MESON_SOURCE_ROOT"/scheds/rust/*/Cargo.toml; do
    source_dir="${manifest%/Cargo.toml}"
-    target_dir="${MESON_BUILD_ROOT}${source_dir#${MESON_SOURCE_ROOT}}"
-    name="${target_dir##*/}"
+    target_dir="${MESON_BUILD_ROOT}/scheds/rust"
+    name="${source_dir##*/}"

    # Skip scx_mitosis
    if [ "$name" = "scx_mitosis" ]; then
--- a/meson.build
+++ b/meson.build
@ -12,8 +12,6 @@ cc = meson.get_compiler('c')

 enable_rust = get_option('enable_rust')

-serialize = get_option('serialize')
-
 bpf_clang = find_program(get_option('bpf_clang'))

 run_veristat = find_program(join_paths(meson.current_source_dir(),
@ -338,9 +336,6 @@ 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_rust
-  subdir('rust')
-endif
 subdir('scheds')

 if enable_stress
--- a/meson.options
+++ b/meson.options
@ -14,8 +14,6 @@ option('offline', type: 'boolean', value: 'false',
       description: 'Compilation step should not access the internet')
 option('enable_rust', type: 'boolean', value: 'true',
       description: 'Enable rust sub-projects')
-option('serialize', type: 'boolean', value: 'true',
-       description: 'Serialize the build of all schedulers')
 option('enable_stress', type: 'boolean', value: 'true',
       description: 'Enable stress tests')
 option('kernel', type: 'string', value: 'vmlinuz',
--- a/rust/scx_stats/.gitignore
+++ b/rust/scx_stats/.gitignore
--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@ -0,0 +1,3 @@
+[workspace]
+members = ["scx_utils", "scx_stats", "scx_stats/scx_stats_derive", "scx_rustland_core"]
+resolver = "2"
--- a/rust/meson.build
+++ b/rust/meson.build
@ -1,3 +0,0 @@
-subdir('scx_utils')
-subdir('scx_stats')
-subdir('scx_rustland_core')
--- a/rust/scx_rustland_core/.gitignore
+++ b/rust/scx_rustland_core/.gitignore
@ -1 +0,0 @@
-Cargo.lock
--- a/rust/scx_rustland_core/meson.build
+++ b/rust/scx_rustland_core/meson.build
@ -1,8 +0,0 @@
-custom_target('scx_rustland_core',
-              output: '@PLAINNAME@.__PHONY__',
-              input: 'Cargo.toml',
-              command: [cargo, 'build', '--manifest-path=@INPUT@', '--target-dir=@OUTDIR@',
-                        cargo_build_args],
-              env: cargo_env,
-              depends: [libbpf, bpftool_target],
-              build_by_default: true)
--- a/rust/scx_stats/Cargo.toml
+++ b/rust/scx_stats/Cargo.toml
@ -1,5 +1,3 @@
-workspace = { members = ["scx_stats_derive"] }
-
 [package]
 name = "scx_stats"
 version = "1.0.3"
--- a/rust/scx_stats/meson.build
+++ b/rust/scx_stats/meson.build
@ -1,7 +0,0 @@
-custom_target('scx_stats',
-              output: '@PLAINNAME@.__PHONY__',
-              input: 'Cargo.toml',
-              command: [cargo, 'build', '--manifest-path=@INPUT@', '--target-dir=@OUTDIR@',
-                        '--all', cargo_build_args],
-              env: cargo_env,
-              build_by_default: true)
--- a/rust/scx_utils/.gitignore
+++ b/rust/scx_utils/.gitignore
@ -1,2 +0,0 @@
-Cargo.lock
-target
--- a/rust/scx_utils/meson.build
+++ b/rust/scx_utils/meson.build
@ -1,8 +0,0 @@
-custom_target('scx_utils',
-              output: '@PLAINNAME@.__PHONY__',
-              input: 'Cargo.toml',
-              command: [cargo, 'build', '--manifest-path=@INPUT@', '--target-dir=@OUTDIR@',
-                        cargo_build_args],
-              env: cargo_env,
-              depends: [libbpf, bpftool_target],
-              build_by_default: true)
--- a/scheds/rust/.gitignore
+++ b/scheds/rust/.gitignore
@ -0,0 +1,2 @@
+*/src/bpf/.output
+target
--- a/scheds/rust/scx_rusty/Cargo.lock
+++ b/scheds/rust/scx_rusty/Cargo.lock
@ -201,9 +201,9 @@ dependencies = [

 [[package]]
 name = "cc"
-version = "1.1.13"
+version = "1.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72db2f7947ecee9b03b510377e8bb9077afa27176fdbff55c51027e976fdcc48"
+checksum = "50d2eb3cd3d1bf4529e31c215ee6f93ec5a3d536d9f578f93d9d33ee19562932"
 dependencies = [
 "shlex",
 ]
@ -443,9 +443,9 @@ dependencies = [

 [[package]]
 name = "fastrand"
-version = "2.1.0"
+version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9fc0510504f03c51ada170672ac806f1f105a88aa97a5281117e1ddc3368e51a"
+checksum = "e8c02a5121d4ea3eb16a80748c74f5549a5665e4c21333c6098f283870fbdea6"

 [[package]]
 name = "fb_procfs"
@ -599,9 +599,9 @@ checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"

 [[package]]
 name = "libbpf-cargo"
-version = "0.24.2"
+version = "0.24.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "457ba100661d900812309eb2f79e1307af0a17cfba7f1e9ae382b071e0c6cace"
+checksum = "3bf2872772e90abbf8a1e0aa5eb53b022a77deb48e7bec00468a610cfb422f58"
 dependencies = [
 "anyhow",
 "cargo_metadata 0.15.4",
@ -617,9 +617,9 @@ dependencies = [

 [[package]]
 name = "libbpf-rs"
-version = "0.24.2"
+version = "0.24.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ecc6eb0468f4b691117c49673da2b833bd2fefbf05a4876a86ad93defd088f12"
+checksum = "f52b1c660da083a765c10249e5b563d5adc12183870277d6a0d10820b222b025"
 dependencies = [
 "bitflags 2.6.0",
 "libbpf-sys",
@ -866,6 +866,12 @@ version = "0.3.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d231b230927b5e4ad203db57bbcbee2802f6bce620b1e4a9024a07d94e2907ec"

+[[package]]
+name = "plain"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4596b6d070b27117e987119b4dac604f3c58cfb0b191112e24771b2faeac1a6"
+
 [[package]]
 name = "portable-atomic"
 version = "1.7.0"
@ -880,9 +886,9 @@ checksum = "439ee305def115ba05938db6eb1644ff94165c5ab5e9420d1c1bcedbba909391"

 [[package]]
 name = "prettyplease"
-version = "0.2.20"
+version = "0.2.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5f12335488a2f3b0a83b14edad48dca9879ce89b2edd10e80237e4e852dd645e"
+checksum = "a909e6e8053fa1a5ad670f5816c7d93029ee1fa8898718490544a6b0d5d38b3e"
 dependencies = [
 "proc-macro2",
 "syn",
@ -914,9 +920,9 @@ dependencies = [

 [[package]]
 name = "quote"
-version = "1.0.36"
+version = "1.0.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0fa76aaf39101c457836aec0ce2316dbdc3ab723cdda1c6bd4e6ad4208acaca7"
+checksum = "b5b9d34b8991d19d98081b46eacdd8eb58c6f2b201139f7c5f643cc155a633af"
 dependencies = [
 "proc-macro2",
 ]
@ -990,6 +996,15 @@ version = "0.8.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7a66a03ae7c801facd77a29370b4faec201768915ac14a721ba36f20bc9c209b"

+[[package]]
+name = "rlimit"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3560f70f30a0f16d11d01ed078a07740fe6b489667abc7c7b029155d9f21c3d8"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "rustc-hash"
 version = "1.1.0"
@ -1030,6 +1045,117 @@ dependencies = [
 "winapi-util",
 ]

+[[package]]
+name = "scx_bpfland"
+version = "1.0.3"
+dependencies = [
+ "anyhow",
+ "clap",
+ "crossbeam",
+ "ctrlc",
+ "libbpf-rs",
+ "log",
+ "rlimit",
+ "scx_stats",
+ "scx_stats_derive",
+ "scx_utils",
+ "serde",
+ "simplelog",
+]
+
+[[package]]
+name = "scx_lavd"
+version = "1.0.3"
+dependencies = [
+ "anyhow",
+ "bitvec",
+ "clap",
+ "crossbeam",
+ "ctrlc",
+ "fb_procfs",
+ "hex",
+ "libbpf-rs",
+ "libc",
+ "log",
+ "nix 0.29.0",
+ "ordered-float 3.9.2",
+ "plain",
+ "rlimit",
+ "scx_stats",
+ "scx_stats_derive",
+ "scx_utils",
+ "serde",
+ "simplelog",
+ "static_assertions",
+]
+
+[[package]]
+name = "scx_layered"
+version = "1.0.3"
+dependencies = [
+ "anyhow",
+ "bitvec",
+ "chrono",
+ "clap",
+ "crossbeam",
+ "ctrlc",
+ "fb_procfs",
+ "lazy_static",
+ "libbpf-rs",
+ "libc",
+ "log",
+ "scx_stats",
+ "scx_stats_derive",
+ "scx_utils",
+ "serde",
+ "serde_json",
+ "simplelog",
+]
+
+[[package]]
+name = "scx_rlfifo"
+version = "1.0.3"
+dependencies = [
+ "anyhow",
+ "ctrlc",
+ "libbpf-rs",
+ "libc",
+ "plain",
+ "scx_rustland_core",
+ "scx_utils",
+]
+
+[[package]]
+name = "scx_rustland"
+version = "1.0.3"
+dependencies = [
+ "anyhow",
+ "clap",
+ "ctrlc",
+ "fb_procfs",
+ "libbpf-rs",
+ "libc",
+ "log",
+ "ordered-float 3.9.2",
+ "plain",
+ "scx_rustland_core",
+ "scx_utils",
+ "simplelog",
+]
+
+[[package]]
+name = "scx_rustland_core"
+version = "1.0.3"
+dependencies = [
+ "anyhow",
+ "libbpf-rs",
+ "libc",
+ "plain",
+ "scx_utils",
+ "tar",
+ "walkdir",
+]
+
 [[package]]
 name = "scx_rusty"
 version = "1.0.3"
@ -1115,18 +1241,18 @@ dependencies = [

 [[package]]
 name = "serde"
-version = "1.0.208"
+version = "1.0.209"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cff085d2cb684faa248efb494c39b68e522822ac0de72ccf08109abde717cfb2"
+checksum = "99fce0ffe7310761ca6bf9faf5115afbc19688edd00171d81b1bb1b116c63e09"
 dependencies = [
 "serde_derive",
 ]

 [[package]]
 name = "serde_derive"
-version = "1.0.208"
+version = "1.0.209"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "24008e81ff7613ed8e5ba0cfaf24e2c2f1e5b8a0495711e44fcd4882fca62bcf"
+checksum = "a5831b979fd7b5439637af1752d535ff49f4860c0f341d1baeb6faf0f4242170"
 dependencies = [
 "proc-macro2",
 "quote",
@ -1135,9 +1261,9 @@ dependencies = [

 [[package]]
 name = "serde_json"
-version = "1.0.125"
+version = "1.0.127"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "83c8e735a073ccf5be70aa8066aa984eaf2fa000db6c8d0100ae605b366d31ed"
+checksum = "8043c06d9f82bd7271361ed64f415fe5e12a77fdb52e573e7f06a516dea329ad"
 dependencies = [
 "itoa",
 "memchr",
@ -1227,9 +1353,9 @@ checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"

 [[package]]
 name = "syn"
-version = "2.0.75"
+version = "2.0.76"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6af063034fc1935ede7be0122941bafa9bacb949334d090b77ca98b5817c7d9"
+checksum = "578e081a14e0cefc3279b0472138c513f37b41a08d5a3cca9b6e4e8ceb6cd525"
 dependencies = [
 "proc-macro2",
 "quote",
--- a/scheds/rust/Cargo.toml
+++ b/scheds/rust/Cargo.toml
@ -0,0 +1,5 @@
+[workspace]
+members = ["scx_lavd", "scx_bpfland", "scx_rustland", "scx_rlfifo",
+           "scx_rusty",
+           "scx_layered"] # scx_mitosis temporarily excluded
+resolver = "2"
--- a/scheds/rust/meson.build
+++ b/scheds/rust/meson.build
@ -1,31 +1,29 @@
-# the previous scheduler in the compile sequence
-sched = []
-
-# Since meson and cargo tries build in parallel, this can cause significant load
-# when meson tries to launch N instances of cargo and cargo tries to compile N files
-# in parallel (N*N compiler instances in total).
-#
-# To prevent this from happening, we try to force meson to build them sequentially
-# by making the "current" scheduler depend on another scheduler.
-# To add a new scheduler, assign the output of your custom_target to sched
-# and add sched as a dependency to your custom_target. For example:
-#
-# sched = custom_target('scx_mysched',
-#                       ...
-#                       depends: [mydep, sched],
-#                       build_always_stale: true)
-subdir('scx_layered')
-#subdir('scx_mitosis') # Temporarily excluded until cgroup support lands in the kernel
-subdir('scx_rusty')
-subdir('scx_rustland')
-subdir('scx_rlfifo')
-subdir('scx_bpfland')
-subdir('scx_lavd')
+sched_deps = [libbpf, bpftool_target]
+cargo_cmd = [cargo, 'build', '--manifest-path=@INPUT@', '--target-dir=@OUTDIR@',
+             cargo_build_args]

 # the target to compile all rust schedulers
 custom_target('rust_scheds',
-              input: 'meson.build',
              output: '@PLAINNAME@.__PHONY__',
-              command: ['touch', '@PLAINNAME@.__PHONY__'],
-              depends: sched,
-              build_by_default: true)
+              input: 'Cargo.toml',
+              command: cargo_cmd,
+              env: cargo_env,
+              depends: sched_deps,
+              build_by_default: true,
+              build_always_stale: true)
+
+# per-scheduler targets
+rust_scheds = ['scx_lavd', 'scx_bpfland', 'scx_rustland', 'scx_rlfifo',
+               'scx_rusty',
+               'scx_layered'] # scx_mitosis temporarily excluded
+
+foreach sched: rust_scheds
+  custom_target(sched,
+                output: sched + '@PLAINNAME@.__PHONY__',
+                input: 'Cargo.toml',
+                command: cargo_cmd + ['-p', sched],
+                env: cargo_env,
+                depends: sched_deps,
+                build_by_default: false,
+                build_always_stale: true)
+endforeach
--- a/scheds/rust/scx_bpfland/Cargo.lock
+++ b/scheds/rust/scx_bpfland/Cargo.lock
--- a/scheds/rust/scx_bpfland/meson.build
+++ b/scheds/rust/scx_bpfland/meson.build
@ -1,9 +1,3 @@
-if serialize
-  sched_deps = [libbpf, bpftool_target, sched]
-else
-  sched_deps = [libbpf, bpftool_target]
-endif
-
 sched = custom_target('scx_bpfland',
              output: '@PLAINNAME@.__PHONY__',
              input: 'Cargo.toml',
@ -11,4 +5,5 @@ sched = custom_target('scx_bpfland',
                        cargo_build_args],
              env: cargo_env,
              depends: sched_deps,
+              build_by_default: false,
              build_always_stale: true)
--- a/scheds/rust/scx_lavd/.gitignore
+++ b/scheds/rust/scx_lavd/.gitignore
@ -1,2 +0,0 @@
-src/bpf/.output
-target
--- a/scheds/rust/scx_lavd/Cargo.lock
+++ b/scheds/rust/scx_lavd/Cargo.lock
--- a/scheds/rust/scx_lavd/meson.build
+++ b/scheds/rust/scx_lavd/meson.build
@ -1,9 +1,3 @@
-if serialize
-  sched_deps = [libbpf, bpftool_target, sched]
-else
-  sched_deps = [libbpf, bpftool_target]
-endif
-
 sched = custom_target('scx_lavd',
              output: '@PLAINNAME@.__PHONY__',
              input: 'Cargo.toml',
@ -11,4 +5,5 @@ sched = custom_target('scx_lavd',
                        cargo_build_args],
              env: cargo_env,
              depends: sched_deps,
+              build_by_default: false,
              build_always_stale: true)
--- a/scheds/rust/scx_layered/.gitignore
+++ b/scheds/rust/scx_layered/.gitignore
@ -1,2 +0,0 @@
-src/bpf/.output
-target
--- a/scheds/rust/scx_layered/Cargo.lock
+++ b/scheds/rust/scx_layered/Cargo.lock
--- a/scheds/rust/scx_layered/meson.build
+++ b/scheds/rust/scx_layered/meson.build
@ -1,9 +1,3 @@
-if serialize
-  sched_deps = [libbpf, bpftool_target, sched]
-else
-  sched_deps = [libbpf, bpftool_target]
-endif
-
 sched = custom_target('scx_layered',
              output: '@PLAINNAME@.__PHONY__',
              input: 'Cargo.toml',
@ -11,4 +5,5 @@ sched = custom_target('scx_layered',
                        cargo_build_args],
              env: cargo_env,
              depends: sched_deps,
+              build_by_default: false,
              build_always_stale: true)
--- a/scheds/rust/scx_mitosis/.gitignore
+++ b/scheds/rust/scx_mitosis/.gitignore
@ -1,2 +0,0 @@
-src/bpf/.output
-target
--- a/scheds/rust/scx_mitosis/Cargo.lock
+++ b/scheds/rust/scx_mitosis/Cargo.lock
--- a/scheds/rust/scx_mitosis/meson.build
+++ b/scheds/rust/scx_mitosis/meson.build
@ -1,9 +1,3 @@
-if serialize
-  sched_deps = [libbpf, bpftool_target, sched]
-else
-  sched_deps = [libbpf, bpftool_target]
-endif
-
 sched = custom_target('scx_mitosis',
              output: '@PLAINNAME@.__PHONY__',
              input: 'Cargo.toml',
@ -11,4 +5,5 @@ sched = custom_target('scx_mitosis',
                        cargo_build_args],
              env: cargo_env,
              depends: sched_deps,
+              build_by_default: false,
              build_always_stale: true)
--- a/scheds/rust/scx_rlfifo/.gitignore
+++ b/scheds/rust/scx_rlfifo/.gitignore
@ -1,5 +1,3 @@
-src/bpf/.output
 intf.h
 main.bpf.c
 bpf.rs
-target
--- a/scheds/rust/scx_rlfifo/Cargo.lock
+++ b/scheds/rust/scx_rlfifo/Cargo.lock
--- a/scheds/rust/scx_rlfifo/meson.build
+++ b/scheds/rust/scx_rlfifo/meson.build
@ -1,9 +1,3 @@
-if serialize
-  sched_deps = [libbpf, bpftool_target, sched]
-else
-  sched_deps = [libbpf, bpftool_target]
-endif
-
 sched = custom_target('scx_rlfifo',
              output: '@PLAINNAME@.__PHONY__',
              input: 'Cargo.toml',
@ -11,4 +5,5 @@ sched = custom_target('scx_rlfifo',
                        cargo_build_args],
              env: cargo_env,
              depends: sched_deps,
+              build_by_default: false,
              build_always_stale: true)
--- a/scheds/rust/scx_rustland/.gitignore
+++ b/scheds/rust/scx_rustland/.gitignore
@ -1,5 +1,3 @@
-src/bpf/.output
 intf.h
 main.bpf.c
 bpf.rs
-target
--- a/scheds/rust/scx_rustland/Cargo.lock
+++ b/scheds/rust/scx_rustland/Cargo.lock
--- a/scheds/rust/scx_rustland/meson.build
+++ b/scheds/rust/scx_rustland/meson.build
@ -1,9 +1,3 @@
-if serialize
-  sched_deps = [libbpf, bpftool_target, sched]
-else
-  sched_deps = [libbpf, bpftool_target]
-endif
-
 sched = custom_target('scx_rustland',
              output: '@PLAINNAME@.__PHONY__',
              input: 'Cargo.toml',
@ -11,4 +5,5 @@ sched = custom_target('scx_rustland',
                        cargo_build_args],
              env: cargo_env,
              depends: sched_deps,
+              build_by_default: false,
              build_always_stale: true)
--- a/scheds/rust/scx_rusty/.gitignore
+++ b/scheds/rust/scx_rusty/.gitignore
@ -1,2 +0,0 @@
-src/bpf/.output
-target
--- a/scheds/rust/scx_rusty/meson.build
+++ b/scheds/rust/scx_rusty/meson.build
@ -1,9 +1,3 @@
-if serialize
-  sched_deps = [libbpf, bpftool_target, sched]
-else
-  sched_deps = [libbpf, bpftool_target]
-endif
-
 sched = custom_target('scx_rusty',
              output: '@PLAINNAME@.__PHONY__',
              input: 'Cargo.toml',
@ -11,4 +5,5 @@ sched = custom_target('scx_rusty',
                        cargo_build_args],
              env: cargo_env,
              depends: sched_deps,
+              build_by_default: false,
              build_always_stale: true)