Michael Freno
b53d4add29
One-off diagnostics behind the FFTW leak fix: init/destroy x50 RSS bound, Mach VM region walker, render-churn region growth, ffmpeg decode-stream region/rss sampling.
35 lines
1.2 KiB
TypeScript
35 lines
1.2 KiB
TypeScript
/** Mach VM region walker via FFI (self-process). */
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import { dlopen, FFIType, ptr } from "bun:ffi"
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const k = dlopen("/usr/lib/system/libsystem_kernel.dylib", {
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mach_task_self: { args: [], returns: FFIType.u64 },
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mach_vm_region: {
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args: [FFIType.u64, FFIType.ptr, FFIType.ptr, FFIType.u32, FFIType.ptr, FFIType.ptr, FFIType.ptr],
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returns: FFIType.i32,
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},
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})
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/** Walk own VM map; count total regions and ~128K ones. */
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export function countRegions(): { total: number; r128k: number } {
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const task = (k.symbols.mach_task_self as any)() as number
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const addr = new BigUint64Array(1)
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const size = new BigUint64Array(1)
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const info = new Uint32Array(16)
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const infoCnt = new Uint32Array(1)
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const objectName = new Uint32Array(1)
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let total = 0
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let r128k = 0
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addr[0] = 1n
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const walk = k.symbols.mach_vm_region as any
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for (;;) {
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infoCnt[0] = 16
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const kr = walk(BigInt(task), ptr(addr), ptr(size), 9, ptr(info), ptr(infoCnt), ptr(objectName))
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if (kr !== 0) break
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total++
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if (size[0] >= 131072n && size[0] <= 139264n) r128k++
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addr[0] = addr[0] + size[0]
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if (addr[0] === 0n || total > 500000) break
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}
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return { total, r128k }
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}
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