hwloc: Clarify reason for failed binding ("can't bind memory")

src/backend/cpu/interfaces/ICpuInfo.h

@@ -29,6 +29,10 @@
 #ifdef XMRIG_FEATURE_HWLOC
 using hwloc_const_bitmap_t  = const struct hwloc_bitmap_s *;
 using hwloc_topology_t      = struct hwloc_topology *;
+#define MEMBIND_SUCCESS    1
+#define MEMBIND_FAIL_SUPP -1
+#define MEMBIND_FAIL_NODE -2
+#define MEMBIND_FAIL_BIND -3
 #endif
 
 
@@ -124,7 +128,7 @@ public:
     virtual uint32_t model() const                                                  = 0;
 
 #   ifdef XMRIG_FEATURE_HWLOC
-    virtual bool membind(hwloc_const_bitmap_t nodeset)                              = 0;
+    virtual int8_t membind(hwloc_const_bitmap_t nodeset)                            = 0;
     virtual const std::vector<uint32_t> &nodeset() const                            = 0;
     virtual hwloc_topology_t topology() const                                       = 0;
 #   endif

src/backend/cpu/platform/HwlocCpuInfo.cpp

@@ -23,6 +23,7 @@
 
 #include <algorithm>
 #include <cmath>
+#include <errno.h>
 #include <hwloc.h>
 
 
@@ -191,16 +192,25 @@ xmrig::HwlocCpuInfo::~HwlocCpuInfo()
 }
 
 
-bool xmrig::HwlocCpuInfo::membind(hwloc_const_bitmap_t nodeset)
+int8_t xmrig::HwlocCpuInfo::membind(hwloc_const_bitmap_t nodeset)
 {
     if (!hwloc_topology_get_support(m_topology)->membind->set_thisthread_membind) {
-        return false;
+        return MEMBIND_FAIL_SUPP;
     }
 
 #   if HWLOC_API_VERSION >= 0x20000
-    return hwloc_set_membind(m_topology, nodeset, HWLOC_MEMBIND_BIND, HWLOC_MEMBIND_THREAD | HWLOC_MEMBIND_BYNODESET) >= 0;
+    int rv = hwloc_set_membind(m_topology, nodeset, HWLOC_MEMBIND_BIND, HWLOC_MEMBIND_THREAD | HWLOC_MEMBIND_BYNODESET);
+    int error = errno;
+
+    if (rv < 0) {
+        LOG_WARN("hwloc_set_membind() error: \"%s\"\n", strerror(error));
+        return MEMBIND_FAIL_BIND;
+    }
+
+    return MEMBIND_SUCCESS;
 #   else
-    return hwloc_set_membind_nodeset(m_topology, nodeset, HWLOC_MEMBIND_BIND, HWLOC_MEMBIND_THREAD) >= 0;
+    return (hwloc_set_membind_nodeset(m_topology, nodeset, HWLOC_MEMBIND_BIND, HWLOC_MEMBIND_THREAD) >= 0)
+        ? MEMBIND_SUCCESS : MEMBIND_FAIL_BIND;
 #   endif
 }
 

src/backend/cpu/platform/HwlocCpuInfo.h

@@ -38,7 +38,7 @@ public:
     ~HwlocCpuInfo() override;
 
 protected:
-    bool membind(hwloc_const_bitmap_t nodeset) override;
+    int8_t membind(hwloc_const_bitmap_t nodeset) override;
     CpuThreads threads(const Algorithm &algorithm, uint32_t limit) const override;
 
     inline const char *backend() const override                     { return m_backend; }

src/crypto/common/VirtualMemory_hwloc.cpp

@@ -34,8 +34,13 @@ uint32_t xmrig::VirtualMemory::bindToNUMANode(int64_t affinity)
 
     auto pu = hwloc_get_pu_obj_by_os_index(Cpu::info()->topology(), static_cast<unsigned>(affinity));
 
-    if (pu == nullptr || !Cpu::info()->membind(pu->nodeset)) {
+    if (pu == nullptr) {
-        LOG_WARN("CPU #%02" PRId64 " warning: \"can't bind memory\"", affinity);
+        LOG_WARN("CPU #%02" PRId64 " warning: \"can't bind memory: hwloc_get_pu_obj_by_os_index() failed\"", affinity);
+
+        return 0;
+    }
+    if (Cpu::info()->membind(pu->nodeset) < 0) {
+        LOG_WARN("CPU #%02" PRId64 " warning: \"can't bind memory: Cpu::info()->membind() failed\"", affinity);
 
         return 0;
     }

src/crypto/rx/RxNUMAStorage.cpp

@@ -42,20 +42,20 @@ constexpr size_t oneMiB = 1024 * 1024;
 static std::mutex mutex;
 
 
-static bool bindToNUMANode(uint32_t nodeId)
+static int8_t bindToNUMANode(uint32_t nodeId)
 {
     auto node = hwloc_get_numanode_obj_by_os_index(Cpu::info()->topology(), nodeId);
     if (!node) {
-        return false;
+        return MEMBIND_FAIL_NODE;
     }
 
-    if (Cpu::info()->membind(node->nodeset)) {
+    if (Cpu::info()->membind(node->nodeset) > 0) {
         Platform::setThreadAffinity(static_cast<uint64_t>(hwloc_bitmap_first(node->cpuset)));
 
-        return true;
+        return MEMBIND_SUCCESS;
     }
 
-    return false;
+    return MEMBIND_FAIL_BIND;
 }
 
 
@@ -210,10 +210,20 @@ private:
     static void allocate(RxNUMAStoragePrivate *d_ptr, uint32_t nodeId, bool hugePages, bool oneGbPages)
     {
         const uint64_t ts = Chrono::steadyMSecs();
+        const int8_t   br = bindToNUMANode(nodeId);
 
-        if (!bindToNUMANode(nodeId)) {
+        if (br < 0) {
-            printSkipped(nodeId, "can't bind memory");
+            switch (br) {
-
+            case MEMBIND_FAIL_SUPP:
+                printSkipped(nodeId, "can't bind memory: hwloc_topology_get_support() failed");
+                break;
+            case MEMBIND_FAIL_NODE:
+                printSkipped(nodeId, "can't bind memory: hwloc_get_numanode_obj_by_os_index() failed");
+                break;
+            case MEMBIND_FAIL_BIND:
+                printSkipped(nodeId, "can't bind memory: Cpu::info()->membind() failed");
+                break;
+            }
             return;
         }