[WIP] do not use hwloc on linux

.github/workflows/pr_push.yml

@@ -19,19 +19,15 @@ permissions:
 jobs:
   CodeChecks:
     uses: ./.github/workflows/reusable_checks.yml
-  FastBuild:
-    name: Fast builds
-    needs: [CodeChecks]
-    uses: ./.github/workflows/reusable_fast.yml
   Build:
     name: Basic builds
-    needs: [FastBuild]
+
     uses: ./.github/workflows/reusable_basic.yml
   DevDax:
-    needs: [FastBuild]
+
     uses: ./.github/workflows/reusable_dax.yml
   MultiNuma:
-    needs: [FastBuild]
+
     uses: ./.github/workflows/reusable_multi_numa.yml
   L0:
     needs: [Build]
@@ -56,10 +52,10 @@ jobs:
       runner: "CUDA"
       shared_lib: "['ON']"
   Sanitizers:
-    needs: [FastBuild]
+
     uses: ./.github/workflows/reusable_sanitizers.yml
   QEMU:
-    needs: [FastBuild]
+
     uses: ./.github/workflows/reusable_qemu.yml
     with:
       short_run: true

include/umf/providers/provider_os_memory.h

@@ -46,6 +46,7 @@ typedef enum umf_numa_mode_t {
     /// umf_numa_split_partition_t can be passed in umf_os_memory_provider_params_t structure
     /// to specify other distribution.
     UMF_NUMA_MODE_SPLIT,
+
     /// The memory is allocated on the node of the CPU that triggered the
     /// allocation. If this mode is specified, nodemask must be NULL and
     /// maxnode must be 0.
@@ -58,6 +59,7 @@ typedef struct umf_numa_split_partition_t {
     /// The weight of the partition, representing the proportion of
     /// the allocation that should be assigned to this NUMA node.
     unsigned weight;
+
     /// The NUMA node where the pages assigned to this partition will be bound.
     unsigned target;
 } umf_numa_split_partition_t;

src/memtargets/memtarget_numa.c

@@ -218,6 +218,8 @@ static umf_result_t numa_get_capacity(void *memTarget, size_t *capacity) {
         return UMF_RESULT_ERROR_INVALID_ARGUMENT;
     }
 
+#if defined(_WIN32) || defined(__APPLE__)
+
     hwloc_topology_t topology = umfGetTopology();
     if (!topology) {
         return UMF_RESULT_ERROR_NOT_SUPPORTED;
@@ -234,6 +236,44 @@ static umf_result_t numa_get_capacity(void *memTarget, size_t *capacity) {
     }
 
     *capacity = numaNode->attr->numanode.local_memory;
+
+#else // Linux
+
+    struct numa_memtarget_t *numaTarget = (struct numa_memtarget_t *)memTarget;
+    unsigned node = numaTarget->physical_id;
+
+    char path[256];
+    snprintf(path, sizeof(path), "/sys/devices/system/node/node%u/meminfo",
+             node);
+    FILE *file = fopen(path, "r");
+    if (!file) {
+        LOG_PDEBUG("Opening sysfs file %s failed", path);
+        return UMF_RESULT_ERROR_INVALID_ARGUMENT;
+    }
+
+    char line[256];
+    size_t node_size = 0;
+    while (fgets(line, sizeof(line), file)) {
+        // search for the MemTotal line
+        if (strncmp(line, "Node ", 5) == 0 &&
+            sscanf(line, "Node %u MemTotal: %zu kB", &node, &node_size) == 2 &&
+            node == numaTarget->physical_id) {
+            // convert kB to bytes
+            node_size *= 1024;
+            break;
+        }
+    }
+    fclose(file);
+
+    if (node_size == 0) {
+        LOG_ERR("Failed to find MemTotal for node %u", numaTarget->physical_id);
+        return UMF_RESULT_ERROR_INVALID_ARGUMENT;
+    }
+
+    *capacity = (size_t)node_size;
+
+#endif
+
     return UMF_RESULT_SUCCESS;
 }
 
@@ -254,9 +294,28 @@ static size_t memattr_get_worst_value(memattr_type_t type) {
     }
 }
 
+#if !defined(_WIN32) && !defined(__APPLE__)
+
+static size_t memattr_get_best_value(memattr_type_t type) {
+    switch (type) {
+    case MEMATTR_TYPE_BANDWIDTH:
+        return SIZE_MAX;
+    case MEMATTR_TYPE_LATENCY:
+        return 0;
+    default:
+        assert(0); // Should not be reachable
+        return 0;
+    }
+}
+
+#endif // !defined(_WIN32) && !defined(__APPLE__)
+
 static umf_result_t query_attribute_value(void *srcMemoryTarget,
                                           void *dstMemoryTarget, size_t *value,
                                           memattr_type_t type) {
+
+#if defined(_WIN32) || defined(__APPLE__)
+
     hwloc_topology_t topology = umfGetTopology();
     if (!topology) {
         LOG_PERR("Retrieving cached topology failed");
@@ -315,6 +374,60 @@ static umf_result_t query_attribute_value(void *srcMemoryTarget,
 
     *value = memAttrValue;
 
+#else
+
+    struct numa_memtarget_t *srcNumaTarget =
+        (struct numa_memtarget_t *)srcMemoryTarget;
+    struct numa_memtarget_t *dstNumaTarget =
+        (struct numa_memtarget_t *)dstMemoryTarget;
+
+    if (srcNumaTarget->physical_id == dstNumaTarget->physical_id) {
+        // If both targets are the same, we return the best possible value.
+        *value = memattr_get_best_value(type);
+        return UMF_RESULT_SUCCESS;
+    }
+
+    // For Linux, we use sysfs to query the bandwidth and latency.
+    char path[256];
+    if (type == MEMATTR_TYPE_BANDWIDTH) {
+        snprintf(path, sizeof(path),
+                 "/sys/devices/system/node/node%u/node%u/memory_bandwidth",
+                 srcNumaTarget->physical_id, dstNumaTarget->physical_id);
+    } else if (type == MEMATTR_TYPE_LATENCY) {
+        snprintf(path, sizeof(path),
+                 "/sys/devices/system/node/node%u/node%u/memory_latency",
+                 srcNumaTarget->physical_id, dstNumaTarget->physical_id);
+    } else {
+        assert(0); // Shouldn't be reachable.
+        return UMF_RESULT_ERROR_INVALID_ARGUMENT;
+    }
+    FILE *file = fopen(path, "r");
+    if (!file) {
+        LOG_PDEBUG("Opening sysfs file %s failed", path);
+        *value = memattr_get_worst_value(type);
+        return UMF_RESULT_SUCCESS;
+    }
+
+    char line[64];
+    if (!fgets(line, sizeof(line), file)) {
+        LOG_PDEBUG("Reading sysfs file %s failed", path);
+        fclose(file);
+        *value = memattr_get_worst_value(type);
+        return UMF_RESULT_SUCCESS;
+    }
+    fclose(file);
+    char *endptr;
+    long long val = strtoll(line, &endptr, 10);
+    if (endptr == line || *endptr != '\n' || val < 0) {
+        LOG_PDEBUG("Parsing sysfs file %s failed", path);
+        *value = memattr_get_worst_value(type);
+        return UMF_RESULT_SUCCESS;
+    }
+
+    *value = (size_t)val;
+
+#endif // _WIN32 || _APPLE_
+
     return UMF_RESULT_SUCCESS;
 }
 

src/provider/provider_os_memory.c

@@ -8,11 +8,16 @@
 #include <assert.h>
 #include <errno.h>
 #include <limits.h>
-
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+
+#if !defined(_WIN32) && !defined(__APPLE__)
+#include <numaif.h>
+#include <sys/syscall.h>
+#endif
+
 #include <umf.h>
 #include <umf/base.h>
 #include <umf/memory_provider.h>
@@ -24,6 +29,7 @@
 #include "ctl/ctl_internal.h"
 #include "libumf.h"
 #include "provider_os_memory_internal.h"
+#include "topology.h"
 #include "utils_assert.h"
 #include "utils_common.h"
 #include "utils_concurrency.h"
@@ -32,8 +38,8 @@
 #define CTL_PROVIDER_TYPE os_memory_provider_t
 #include "provider_ctl_stats_impl.h"
 
+#define MAX_NUMNODES 1024
 #define NODESET_STR_BUF_LEN 1024
-
 #define TLS_MSG_BUF_LEN 1024
 
 static const char *DEFAULT_NAME = "OS";
@@ -152,8 +158,14 @@ static umf_result_t initialize_nodeset(os_memory_provider_t *os_provider,
         // Hwloc_set_area_membind fails if empty nodeset is passed so
         // if no node is specified, just pass all available nodes.
         // For modes where no node is needed, they will be ignored anyway.
+
+#if defined(_WIN32) || defined(__APPLE__)
         out_nodeset[0] = hwloc_bitmap_dup(
             hwloc_topology_get_complete_nodeset(os_provider->topo));
+#else
+        out_nodeset[0] = hwloc_bitmap_dup(umfGetTopology2());
+#endif
+
         if (!out_nodeset[0]) {
             goto err_free_list;
         }
@@ -518,6 +530,11 @@ translate_params(const umf_os_memory_provider_params_t *in_params,
 
     provider->numa_flags =
         getHwlocMembindFlags(in_params->numa_mode, is_dedicated_node_bind);
+
+#if !defined(_WIN32) && !defined(__APPLE__)
+    provider->dedicated = is_dedicated_node_bind;
+#endif
+
     provider->mode = in_params->numa_mode;
     provider->part_size = in_params->part_size;
 
@@ -561,6 +578,11 @@ static umf_result_t os_initialize(const void *params, void **provider) {
     snprintf(os_provider->name, sizeof(os_provider->name), "%s",
              in_params->name);
 
+#if defined(_WIN32) || defined(__APPLE__)
+
+    //struct timespec ts_init_start, ts_init_end;
+    //clock_gettime(CLOCK_MONOTONIC, &ts_init_start);
+
     int r = hwloc_topology_init(&os_provider->topo);
     if (r) {
         LOG_ERR("HWLOC topology init failed");
@@ -577,6 +599,13 @@ static umf_result_t os_initialize(const void *params, void **provider) {
         goto err_destroy_hwloc_topology;
     }
 
+    //clock_gettime(CLOCK_MONOTONIC, &ts_init_end);
+    //LOG_FATAL("HWLOC topology initialized in %ld.%09ld seconds",
+    //          ts_init_end.tv_sec - ts_init_start.tv_sec,
+    //          ts_init_end.tv_nsec - ts_init_start.tv_nsec);
+
+#endif // _WIN32
+
     os_provider->fd_offset_map = critnib_new(NULL, NULL);
     if (!os_provider->fd_offset_map) {
         LOG_ERR("creating file descriptor offset map failed");
@@ -625,8 +654,11 @@ static umf_result_t os_initialize(const void *params, void **provider) {
 err_destroy_critnib:
     critnib_delete(os_provider->fd_offset_map);
 err_destroy_hwloc_topology:
+
+#if defined(_WIN32) || defined(__APPLE__)
     hwloc_topology_destroy(os_provider->topo);
 err_free_os_provider:
+#endif
     umf_ba_global_free(os_provider);
     return ret;
 }
@@ -649,7 +681,10 @@ static umf_result_t os_finalize(void *provider) {
     if (os_provider->nodeset_str_buf) {
         umf_ba_global_free(os_provider->nodeset_str_buf);
     }
+
+#if defined(_WIN32) || defined(__APPLE__)
     hwloc_topology_destroy(os_provider->topo);
+#endif
     umf_ba_global_free(os_provider);
     return UMF_RESULT_SUCCESS;
 }
@@ -1012,10 +1047,52 @@ static umf_result_t os_alloc(void *provider, size_t size, size_t alignment,
 
         do {
             errno = 0;
+            ret = 0;
+
+#if defined(_WIN32) || defined(__APPLE__)
             ret = hwloc_set_area_membind(os_provider->topo, membind.addr,
                                          membind.bind_size, membind.bitmap,
                                          os_provider->numa_policy,
                                          os_provider->numa_flags);
+#else  // !_WIN32 && !_APPLE__
+
+            // NOTE: could we done this
+
+            // on Linux, use mbind syscall directly instead of hwloc
+            unsigned long nodemask = 0;
+            int maxnode = 8 * sizeof(nodemask); // up to 64 nodes
+            if (membind.bitmap) {
+                for (int i = 0; i < maxnode; ++i) {
+                    if (hwloc_bitmap_isset(membind.bitmap, i)) {
+                        nodemask |= (1UL << i);
+                    }
+                }
+            }
+
+            int mbind_mode = MPOL_DEFAULT;
+            if (os_provider->mode == UMF_NUMA_MODE_INTERLEAVE &&
+                os_provider->dedicated == 0) {
+                mbind_mode = MPOL_INTERLEAVE;
+            } else if (os_provider->mode == UMF_NUMA_MODE_SPLIT) {
+                mbind_mode = MPOL_BIND;
+            } else if (os_provider->mode == UMF_NUMA_MODE_LOCAL) {
+                mbind_mode = MPOL_LOCAL;
+                nodemask = 0;
+            } else if (os_provider->mode == UMF_NUMA_MODE_PREFERRED) {
+                mbind_mode = MPOL_BIND;
+            } else if (os_provider->mode == UMF_NUMA_MODE_BIND ||
+                       os_provider->dedicated) {
+                mbind_mode = MPOL_BIND;
+            }
+
+            unsigned long mbind_flags = 0;
+            if (os_provider->dedicated) {
+                mbind_flags |= MPOL_MF_STRICT;
+            }
+
+            ret = syscall(__NR_mbind, membind.addr, membind.bind_size,
+                          mbind_mode, &nodemask, maxnode, mbind_flags);
+#endif // !_WIN32 && !_APPLE__
 
             if (ret) {
                 os_store_last_native_error(UMF_OS_RESULT_ERROR_BIND_FAILED,

src/provider/provider_os_memory_internal.h

@@ -68,7 +68,13 @@ typedef struct os_memory_provider_t {
     unsigned partitions_len;
     size_t partitions_weight_sum;
 
+#if defined(_WIN32) || defined(__APPLE__)
     hwloc_topology_t topo;
+#else
+    // NOTE: on linux we don't want to use hwloc_topology_t directly because
+    // of its long initialization time
+    int dedicated;
+#endif
 
     char name[64];