build: add some missing darwin tags

This avoids pessimizing concurrency on all machines due to e.g. the macOS
machine having high memory usage across the board due to 16K page size.

.forgejo/workflows/ci.yaml

@@ -5,6 +5,7 @@ on:
   push:
     branches:
       - master
+      - max-rss-tuning
   workflow_dispatch:
 
 concurrency:

build.zig

@@ -459,8 +459,29 @@ pub fn build(b: *std.Build) !void {
         .skip_linux = skip_linux,
         .skip_llvm = skip_llvm,
         .skip_libc = skip_libc,
-        // 3888779264 was observed on an x86_64-linux-gnu host.
+        .max_rss = switch (b.graph.host.result.os.tag) {
-        .max_rss = 4000000000,
+            .freebsd => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 1, // TODO
+                else => 0,
+            },
+            .linux => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 659809075,
+                .loongarch64 => 598902374,
+                .riscv64 => 1, // TODO
+                .s390x => 580596121,
+                .x86_64 => 3290894745,
+                else => 0,
+            },
+            .macos => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 767736217,
+                else => 0,
+            },
+            .windows => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 603070054,
+                else => 0,
+            },
+            else => 0,
+        },
     }));
 
     test_modules_step.dependOn(tests.addModuleTests(b, .{
@@ -483,6 +504,29 @@ pub fn build(b: *std.Build) !void {
         .skip_llvm = skip_llvm,
         .skip_libc = true,
         .no_builtin = true,
+        .max_rss = switch (b.graph.host.result.os.tag) {
+            .freebsd => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 1, // TODO
+                else => 0,
+            },
+            .linux => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 639565414,
+                .loongarch64 => 598884352,
+                .riscv64 => 1, // TODO
+                .s390x => 574166630,
+                .x86_64 => 764861644,
+                else => 0,
+            },
+            .macos => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 701413785,
+                else => 0,
+            },
+            .windows => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 536414208,
+                else => 0,
+            },
+            else => 0,
+        },
     }));
 
     test_modules_step.dependOn(tests.addModuleTests(b, .{
@@ -505,6 +549,29 @@ pub fn build(b: *std.Build) !void {
         .skip_llvm = skip_llvm,
         .skip_libc = true,
         .no_builtin = true,
+        .max_rss = switch (b.graph.host.result.os.tag) {
+            .freebsd => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 1, // TODO
+                else => 0,
+            },
+            .linux => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 615302758,
+                .loongarch64 => 598974464,
+                .riscv64 => 1, // TODO
+                .s390x => 395555635,
+                .x86_64 => 528128409,
+                else => 0,
+            },
+            .macos => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 451389030,
+                else => 0,
+            },
+            .windows => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 317852057,
+                else => 0,
+            },
+            else => 0,
+        },
     }));
 
     test_modules_step.dependOn(tests.addModuleTests(b, .{
@@ -526,8 +593,29 @@ pub fn build(b: *std.Build) !void {
         .skip_linux = skip_linux,
         .skip_llvm = skip_llvm,
         .skip_libc = skip_libc,
-        // I observed a value of 5605064704 on the M2 CI.
+        .max_rss = switch (b.graph.host.result.os.tag) {
-        .max_rss = 6165571174,
+            .freebsd => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 1, // TODO
+                else => 0,
+            },
+            .linux => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 6732817203,
+                .loongarch64 => 3216349593,
+                .riscv64 => 1, // TODO
+                .s390x => 3652514201,
+                .x86_64 => 5554053120,
+                else => 0,
+            },
+            .macos => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 8273795481,
+                else => 0,
+            },
+            .windows => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 3750236160,
+                else => 0,
+            },
+            else => 0,
+        },
     }));
 
     const unit_tests_step = b.step("test-unit", "Run the compiler source unit tests");
@@ -543,6 +631,7 @@ pub fn build(b: *std.Build) !void {
         .use_llvm = use_llvm,
         .use_lld = use_llvm,
         .zig_lib_dir = b.path("lib"),
+        .max_rss = 1,
     });
     if (link_libc) {
         unit_tests.root_module.link_libc = true;
@@ -721,7 +810,29 @@ fn addCompilerMod(b: *std.Build, options: AddCompilerModOptions) *std.Build.Modu
 fn addCompilerStep(b: *std.Build, options: AddCompilerModOptions) *std.Build.Step.Compile {
     const exe = b.addExecutable(.{
         .name = "zig",
-        .max_rss = 7_800_000_000,
+        .max_rss = switch (b.graph.host.result.os.tag) {
+            .freebsd => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 1, // TODO
+                else => 0,
+            },
+            .linux => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 6240805683,
+                .loongarch64 => 5024158515,
+                .riscv64 => 1, // TODO
+                .s390x => 4997174476,
+                .x86_64 => 5486090649,
+                else => 0,
+            },
+            .macos => switch (b.graph.host.result.cpu.arch) {
+                .aarch64 => 6639145779,
+                else => 0,
+            },
+            .windows => switch (b.graph.host.result.cpu.arch) {
+                .x86_64 => 5770394009,
+                else => 0,
+            },
+            else => 0,
+        },
         .root_module = addCompilerMod(b, options),
     });
     exe.stack_size = stack_size;
@@ -798,7 +909,7 @@ fn addCmakeCfgOptionsToExe(
                 };
                 mod.linkSystemLibrary("unwind", .{});
             },
-            .ios, .macos, .watchos, .tvos, .visionos => {
+            .driverkit, .ios, .maccatalyst, .macos, .tvos, .visionos, .watchos => {
                 mod.link_libcpp = true;
             },
             .windows => {

lib/std/c.zig

@@ -4471,7 +4471,7 @@ pub const rusage = switch (native_os) {
         pub const SELF = 1;
         pub const CHILDREN = 2;
     },
-    .freebsd => extern struct {
+    .freebsd, .openbsd => extern struct {
         utime: timeval,
         stime: timeval,
         maxrss: c_long,
@@ -4493,6 +4493,27 @@ pub const rusage = switch (native_os) {
         pub const CHILDREN = -1;
         pub const THREAD = 1;
     },
+    .dragonfly, .netbsd => extern struct {
+        utime: timeval,
+        stime: timeval,
+        maxrss: c_long,
+        ixrss: c_long,
+        idrss: c_long,
+        isrss: c_long,
+        minflt: c_long,
+        majflt: c_long,
+        nswap: c_long,
+        inblock: c_long,
+        oublock: c_long,
+        msgsnd: c_long,
+        msgrcv: c_long,
+        nsignals: c_long,
+        nvcsw: c_long,
+        nivcsw: c_long,
+
+        pub const SELF = 0;
+        pub const CHILDREN = -1;
+    },
     else => void,
 };
 

lib/std/process/Child.zig

@@ -122,7 +122,7 @@ pub const ResourceUsageStatistics = struct {
     /// if available.
     pub inline fn getMaxRss(rus: ResourceUsageStatistics) ?usize {
         switch (native_os) {
-            .linux => {
+            .dragonfly, .freebsd, .netbsd, .openbsd, .illumos, .linux, .serenity => {
                 if (rus.rusage) |ru| {
                     return @as(usize, @intCast(ru.maxrss)) * 1024;
                 } else {
@@ -149,7 +149,21 @@ pub const ResourceUsageStatistics = struct {
     }
 
     const rusage_init = switch (native_os) {
-        .linux, .driverkit, .ios, .maccatalyst, .macos, .tvos, .visionos, .watchos => @as(?posix.rusage, null),
+        .dragonfly,
+        .freebsd,
+        .netbsd,
+        .openbsd,
+        .illumos,
+        .linux,
+        .serenity,
+        .driverkit,
+        .ios,
+        .maccatalyst,
+        .macos,
+        .tvos,
+        .visionos,
+        .watchos,
+        => @as(?posix.rusage, null),
         .windows => @as(?windows.VM_COUNTERS, null),
         else => {},
     };
@@ -486,7 +500,21 @@ fn waitUnwrappedPosix(self: *ChildProcess) void {
     const res: posix.WaitPidResult = res: {
         if (self.request_resource_usage_statistics) {
             switch (native_os) {
-                .linux, .driverkit, .ios, .maccatalyst, .macos, .tvos, .visionos, .watchos => {
+                .dragonfly,
+                .freebsd,
+                .netbsd,
+                .openbsd,
+                .illumos,
+                .linux,
+                .serenity,
+                .driverkit,
+                .ios,
+                .maccatalyst,
+                .macos,
+                .tvos,
+                .visionos,
+                .watchos,
+                => {
                     var ru: posix.rusage = undefined;
                     const res = posix.wait4(self.id, 0, &ru);
                     self.resource_usage_statistics.rusage = ru;

test/tests.zig

@@ -2595,6 +2595,7 @@ pub fn addCAbiTests(b: *std.Build, options: CAbiTestOptions) *Step {
                 .root_module = test_mod,
                 .use_llvm = c_abi_target.use_llvm,
                 .use_lld = c_abi_target.use_lld,
+                .max_rss = 1,
             });
 
             // This test is intentionally trying to check if the external ABI is