Fix memory usage via /proc/meminfo on Linux

src/server/api/system.ts

@@ -1,7 +1,7 @@
 import { allApps, APPS_DIR, onChange, TOES_DIR } from '$apps'
 import { onHostLog } from '../tui'
 import { Hype } from '@because/hype'
-import { cpus, platform, totalmem } from 'os'
+import { cpus, freemem, platform, totalmem } from 'os'
 import { join } from 'path'
 import { existsSync, mkdirSync, readFileSync, statfsSync, writeFileSync } from 'fs'
 
@@ -68,37 +68,23 @@ function getCpuUsage(): number {
 
 function getMemoryUsage(): { used: number, total: number, percent: number } {
   const total = totalmem()
-  const apps = allApps().filter(a => a.proc?.pid)
-  let used = 0
 
   if (platform() === 'linux') {
-    for (const app of apps) {
-      try {
-        const status = readFileSync(`/proc/${app.proc!.pid}/status`, 'utf-8')
-        const match = status.match(/VmRSS:\s+(\d+)/)
-        if (match) used += parseInt(match[1]!, 10) * 1024
-      } catch {}
-    }
-  } else {
-    // macOS: batch ps call for all pids
-    const pids = apps.map(a => a.proc!.pid).join(',')
-    if (pids) {
-      try {
-        const result = Bun.spawnSync(['ps', '-o', 'rss=', '-p', pids])
-        const output = result.stdout.toString()
-        for (const line of output.split('\n')) {
-          const kb = parseInt(line.trim(), 10)
-          if (kb) used += kb * 1024
-        }
-      } catch {}
-    }
+    try {
+      const meminfo = readFileSync('/proc/meminfo', 'utf-8')
+      const available = meminfo.match(/MemAvailable:\s+(\d+)/)
+      if (available) {
+        const availableBytes = parseInt(available[1]!, 10) * 1024
+        const used = total - availableBytes
+        return { used, total, percent: Math.round((used / total) * 100) }
+      }
+    } catch {}
   }
 
-  return {
-    used,
-    total,
-    percent: used > 0 ? Math.max(1, Math.round((used / total) * 100)) : 0,
-  }
+  // macOS fallback
+  const free = freemem()
+  const used = total - free
+  return { used, total, percent: Math.round((used / total) * 100) }
 }
 
 function getDiskUsage(): { used: number, total: number, percent: number } {