Further CPU Experimental Changes

server/services/collectors/ebpf.js

@@ -16,6 +16,7 @@ import {
   SAMPLE_INTERVAL_MS,
   registerChart,
 } from '../../../shared/metrics.js'
+import { readFileCached, readFileBuf } from '../../utils/fd-cache.js'
 import { extractHelper, hasEmbeddedHelper } from '../../native/extract-helper.js'
 import logger from '../../utils/logger.js'
 
@@ -202,13 +203,12 @@ export class EbpfCollector extends EventEmitter {
   _readVm() {
     /** @type {Record<string, number>} */
     const out = {}
-    try {
-      for (const line of fs.readFileSync('/proc/vmstat', 'utf8').split('\n')) {
+    const raw = readFileCached('/proc/vmstat')
+    if (raw) {
+      for (const line of raw.split('\n')) {
         const [k, v] = line.trim().split(/\s+/)
         if (k) out[k] = Number(v) || 0
       }
-    } catch {
-      // ignore
     }
     return out
   }
@@ -228,30 +228,27 @@ export class EbpfCollector extends EventEmitter {
     const den = dHit + dMiss
 
     let fileNr = [0, 0]
-    try {
-      const parts = fs.readFileSync('/proc/sys/fs/file-nr', 'utf8').trim().split(/\s+/)
+    const fileNrRaw = readFileCached('/proc/sys/fs/file-nr')
+    if (fileNrRaw) {
+      const parts = fileNrRaw.trim().split(/\s+/)
       fileNr = [Number(parts[0]) || 0, Number(parts[2]) || 0]
-    } catch {
-      // ignore
     }
 
     let forks = 0
     let ctxt = 0
-    try {
-      for (const line of fs.readFileSync('/proc/stat', 'utf8').split('\n')) {
+    const statRaw = readFileCached('/proc/stat')
+    if (statRaw) {
+      for (const line of statRaw.split('\n')) {
         if (line.startsWith('processes ')) forks = Number(line.slice(10)) || 0
         if (line.startsWith('ctxt ')) ctxt = Number(line.slice(5)) || 0
       }
-    } catch {
-      // ignore
     }
 
     let tcp = 0
-    try {
-      const m = fs.readFileSync('/proc/net/sockstat', 'utf8').match(/TCP:\s+inuse\s+(\d+)/)
+    const sockRaw = readFileCached('/proc/net/sockstat')
+    if (sockRaw) {
+      const m = sockRaw.match(/TCP:\s+inuse\s+(\d+)/)
       if (m) tcp = Number(m[1]) || 0
-    } catch {
-      // ignore
     }
 
     const batch = [