fix shared memory fallback accounting

src/components/frontend/src/app.tsx

@@ -884,7 +884,11 @@ function ProcessResourceTable({ current, onRaw }: AnyRecord) {
   const processSummary = current?.processSummary && typeof current.processSummary === "object" ? current.processSummary : {};
   const processes = Array.isArray(current?.processes) ? current.processes : [];
   const memoryMode = String(processSummary.memoryMode || "");
-  const memoryModeLabel = memoryMode === "pss_smaps_rollup" ? "PSS" : "RSS fallback";
+  const memoryModeLabel = memoryMode.includes("pss_smaps_rollup")
+    ? "PSS"
+    : memoryMode === "rss_minus_shared_fallback"
+      ? "RSS-shared"
+      : "RSS fallback";
   const rows = useMemo(() => {
     const direction = sort.direction === "asc" ? 1 : -1;
     return [...processes].sort((left: AnyRecord, right: AnyRecord) => {

src/components/provider-gateway/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@unidesk/provider-gateway",
-  "version": "0.2.23",
+  "version": "0.2.24",
   "private": true,
   "type": "module",
   "scripts": {

src/components/provider-gateway/src/index.ts

@@ -914,7 +914,7 @@ function readProcessIo(pid: number): { readBytes: number; writeBytes: number } {
   }
 }
 
-function readProcessMemory(pid: number, rssBytes: number): {
+function readProcessMemory(pid: number, rssBytes: number, pageSize: number): {
   memoryBytes: number;
   memoryMode: string;
   pssBytes?: number;
@@ -945,7 +945,20 @@ function readProcessMemory(pid: number, rssBytes: number): {
       swapPssBytes,
     };
   } catch {
-    return { memoryBytes: rssBytes, memoryMode: "rss_fallback" };
+    try {
+      const fields = readFileSync(`/proc/${pid}/statm`, "utf8").trim().split(/\s+/);
+      const sharedPages = Number(fields[2]);
+      const sharedBytes = Number.isFinite(sharedPages) ? Math.max(0, sharedPages * pageSize) : 0;
+      const privateBytes = Math.max(0, rssBytes - sharedBytes);
+      return {
+        memoryBytes: privateBytes,
+        memoryMode: "rss_minus_shared_fallback",
+        privateBytes,
+        sharedBytes,
+      };
+    } catch {
+      return { memoryBytes: rssBytes, memoryMode: "rss_fallback" };
+    }
   }
 }
 
@@ -1024,7 +1037,7 @@ async function collectProcessResources(totalMemoryBytes: number, cpuCores: numbe
       const readBytesPerSecond = previous && ioSeconds > 0 ? Math.max(0, io.readBytes - previous.readBytes) / ioSeconds : 0;
       const writeBytesPerSecond = previous && ioSeconds > 0 ? Math.max(0, io.writeBytes - previous.writeBytes) / ioSeconds : 0;
       const rssBytes = Math.max(0, stat.rssPages * pageSize);
-      const processMemory = readProcessMemory(pid, rssBytes);
+      const processMemory = readProcessMemory(pid, rssBytes, pageSize);
       const name = status.name || stat.name;
       const uid = status.uid >= 0 ? status.uid : 0;
       rows.push({
@@ -1068,6 +1081,7 @@ async function collectProcessResources(totalMemoryBytes: number, cpuCores: numbe
   previousProcessSamples = new Map([...previousProcessSamples].filter(([pid]) => seen.has(pid)));
   rows.sort((a, b) => b.memoryBytes - a.memoryBytes || b.cpuPercent - a.cpuPercent || a.pid - b.pid);
   const pssRows = rows.filter((row) => row.memoryMode === "pss_smaps_rollup").length;
+  const rssMinusSharedRows = rows.filter((row) => row.memoryMode === "rss_minus_shared_fallback").length;
   return {
     processes: rows.slice(0, 120),
     summary: {
@@ -1076,9 +1090,10 @@ async function collectProcessResources(totalMemoryBytes: number, cpuCores: numbe
       skipped,
       defaultSort: "memory_desc",
       scope: "provider_pid_namespace",
-      memoryMode: pssRows > 0 ? "pss_smaps_rollup" : "rss_fallback",
+      memoryMode: pssRows > 0 ? "pss_smaps_rollup_with_fallback" : rssMinusSharedRows > 0 ? "rss_minus_shared_fallback" : "rss_fallback",
       pssRows,
-      rssFallbackRows: rows.length - pssRows,
+      rssMinusSharedRows,
+      rssFallbackRows: rows.length - pssRows - rssMinusSharedRows,
       cpuPercentMode: hasPreviousProcessSample ? "delta_ticks_per_sample" : "lifetime_average_first_sample",
       diskIoMode: "proc_pid_io_delta_bytes_per_second",
     },