X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/000d2d48da81d92c26baeddb49c41afc51ff9981..e3f5ca3fd3726e67046afbd03e48e9cd7294b835:/src/mc/mc_snapshot.c

diff --git a/src/mc/mc_snapshot.c b/src/mc/mc_snapshot.c
index e631109ab0..5746848cd4 100644
--- a/src/mc/mc_snapshot.c
+++ b/src/mc/mc_snapshot.c
@@ -6,20 +6,46 @@
 
 #include <stdbool.h>
 
+#include "internal_config.h"
+#include "smpi/private.h"
+
+#include "mc_snapshot.h"
 #include "mc_private.h"
 #include "mc_mmu.h"
 #include "mc_page_store.h"
 
-mc_mem_region_t mc_get_snapshot_region(void* addr, mc_snapshot_t snapshot)
+/** @brief Find the snapshoted region from a pointer
+ *
+ *  @param addr     Pointer
+ *  @param snapshot Snapshot
+ *  @param Snapshot region in the snapshot this pointer belongs to
+ *         (or NULL if it does not belong to any snapshot region)
+ * */
+mc_mem_region_t mc_get_snapshot_region(void* addr, mc_snapshot_t snapshot, int process_index)
 {
-  for (size_t i = 0; i != NB_REGIONS; ++i) {
-    mc_mem_region_t region = snapshot->regions[i];
-    void* start = region->start_addr;
-    void* end = (char*) start + region->size;
-
-    if (addr >= start && addr < end) {
-      return region;
+  size_t n = snapshot->snapshot_regions_count;
+  for (size_t i = 0; i != n; ++i) {
+    mc_mem_region_t region = snapshot->snapshot_regions[i];
+    if (!(region && mc_region_contain(region, addr)))
+      continue;
+
+    if (region->storage_type == MC_REGION_STORAGE_TYPE_PRIVATIZED) {
+#ifdef HAVE_SMPI
+      if (process_index < 0) {
+        xbt_die("Missing process index");
+      }
+      if (process_index >= region->privatized.regions_count) {
+        xbt_die("Invalid process index");
+      }
+      mc_mem_region_t priv_region = region->privatized.regions[process_index];
+      xbt_assert(mc_region_contain(priv_region, addr));
+      return priv_region;
+#else
+      xbt_die("Privatized region in a non SMPI build (this should not happen)");
+#endif
     }
+
+    return region;
   }
 
   return NULL;
@@ -35,8 +61,12 @@ mc_mem_region_t mc_get_snapshot_region(void* addr, mc_snapshot_t snapshot)
  */
 void* mc_snapshot_read_fragmented(void* addr, mc_mem_region_t region, void* target, size_t size)
 {
+  // Last byte of the memory area:
   void* end = (char*) addr + size - 1;
+
+  // Page of the last byte of the memory area:
   size_t page_end = mc_page_number(NULL, end);
+
   void* dest = target;
 
   if (dest==NULL) {
@@ -67,12 +97,12 @@ void* mc_snapshot_read_fragmented(void* addr, mc_mem_region_t region, void* targ
  *  @param snapshot Snapshot (or NULL is no snapshot)
  *  @param target   Buffer to store the value
  *  @param size     Size of the data to read in bytes
- *  @return Pointer where the data is located (target buffer of original location)
+ *  @return Pointer where the data is located (target buffer or original location)
  */
-void* mc_snapshot_read(void* addr, mc_snapshot_t snapshot, void* target, size_t size)
+void* mc_snapshot_read(void* addr, mc_snapshot_t snapshot, int process_index, void* target, size_t size)
 {
   if (snapshot) {
-    mc_mem_region_t region = mc_get_snapshot_region(addr, snapshot);
+    mc_mem_region_t region = mc_get_snapshot_region(addr, snapshot, process_index);
     return mc_snapshot_read_region(addr, region, target, size);
   } else {
     return addr;
@@ -89,13 +119,16 @@ void* mc_snapshot_read(void* addr, mc_snapshot_t snapshot, void* target, size_t
  * */
 int mc_snapshot_region_memcmp(
   void* addr1, mc_mem_region_t region1,
-  void* addr2, mc_mem_region_t region2, size_t size)
+  void* addr2, mc_mem_region_t region2,
+  size_t size)
 {
   // Using alloca() for large allocations may trigger stack overflow:
   // use malloc if the buffer is too big.
   bool stack_alloc = size < 64;
-  void* buffer1a = (region1==NULL || region1->data) ? NULL : stack_alloc ? alloca(size) : malloc(size);
-  void* buffer2a = (region2==NULL || region2->data) ? NULL : stack_alloc ? alloca(size) : malloc(size);
+  const bool region1_need_buffer = region1==NULL || region1->storage_type==MC_REGION_STORAGE_TYPE_FLAT;
+  const bool region2_need_buffer = region2==NULL || region2->storage_type==MC_REGION_STORAGE_TYPE_FLAT;
+  void* buffer1a = region1_need_buffer ? NULL : stack_alloc ? alloca(size) : malloc(size);
+  void* buffer2a = region2_need_buffer ? NULL : stack_alloc ? alloca(size) : malloc(size);
   void* buffer1 = mc_snapshot_read_region(addr1, region1, buffer1a, size);
   void* buffer2 = mc_snapshot_read_region(addr2, region2, buffer2a, size);
   int res;
@@ -119,12 +152,12 @@ int mc_snapshot_region_memcmp(
  * @param snapshot2 Second snapshot
  * @return same as memcmp
  * */
-int mc_snapshot_memcp(
+int mc_snapshot_memcmp(
   void* addr1, mc_snapshot_t snapshot1,
-  void* addr2, mc_snapshot_t snapshot2, size_t size)
+  void* addr2, mc_snapshot_t snapshot2, int process_index, size_t size)
 {
-  mc_mem_region_t region1 = mc_get_snapshot_region(addr1, snapshot1);
-  mc_mem_region_t region2 = mc_get_snapshot_region(addr2, snapshot2);
+  mc_mem_region_t region1 = mc_get_snapshot_region(addr1, snapshot1, process_index);
+  mc_mem_region_t region2 = mc_get_snapshot_region(addr2, snapshot2, process_index);
   return mc_snapshot_region_memcmp(addr1, region1, addr2, region2, size);
 }
 
@@ -136,31 +169,44 @@ int mc_snapshot_memcp(
 #include <sys/mman.h>
 
 #include "mc/mc_private.h"
+#include "mc/mc_snapshot.h"
+#include "mc/mc_mmu.h"
 
 XBT_TEST_SUITE("mc_snapshot", "Snapshots");
 
 static inline void init_memory(void* mem, size_t size)
 {
-  size_t hash = 5381;
-  hash = ((hash << 5) + hash) + (uintptr_t) size;
-  hash = ((hash << 5) + hash) + size;
   char* dest = (char*) mem;
   for (int i=0; i!=size; ++i) {
-    hash = ((hash << 5) + hash) + size;
-    dest[i] = hash & 255;
+    dest[i] = rand() & 255;
   }
 }
 
-XBT_TEST_UNIT("page_region", test_snapshot_page_read, "Test page snapshots")
+static void test_snapshot(bool sparse_checkpoint);
+
+XBT_TEST_UNIT("page_snapshots", test_per_snpashots, "Test per-page snapshots")
+{
+  test_snapshot(1);
+}
+
+
+XBT_TEST_UNIT("flat_snapshot", test_flat_snapshots, "Test flat snapshots")
 {
+  test_snapshot(0);
+}
+
+
+static void test_snapshot(bool sparse_checkpoint) {
+
   xbt_test_add("Initialisation");
   _sg_mc_soft_dirty = 0;
+  _sg_mc_sparse_checkpoint = sparse_checkpoint;
   xbt_assert(xbt_pagesize == getpagesize());
   xbt_assert(1 << xbt_pagebits == xbt_pagesize);
   mc_model_checker = xbt_new0(s_mc_model_checker_t, 1);
   mc_model_checker->pages = mc_pages_store_new();
 
-  for(int n=1; n!=10; ++n) {
+  for(int n=1; n!=256; ++n) {
 
     // Store region page(s):
     size_t byte_size = n * xbt_pagesize;
@@ -169,24 +215,35 @@ XBT_TEST_UNIT("page_region", test_snapshot_page_read, "Test page snapshots")
 
     // Init memory and take snapshots:
     init_memory(source, byte_size);
-    mc_mem_region_t region0 = mc_region_new_sparse(0, source, byte_size, NULL);
-    for(int i=1; i<n; i+=2) {
+    mc_mem_region_t region0 = mc_region_new_sparse(MC_REGION_TYPE_UNKNOWN, source, source, byte_size, NULL);
+    for(int i=0; i<n; i+=2) {
       init_memory((char*) source + i*xbt_pagesize, xbt_pagesize);
     }
-    mc_mem_region_t region = mc_region_new_sparse(0, source, byte_size, NULL);
+    mc_mem_region_t region = mc_region_new_sparse(MC_REGION_TYPE_UNKNOWN, source, source, byte_size, NULL);
 
     void* destination = mmap(NULL, byte_size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
     xbt_assert(source!=MAP_FAILED, "Could not allocate destination memory");
 
-    xbt_test_add("Reading region data for %i page(s)", n);
+    xbt_test_add("Reading whole region data for %i page(s)", n);
+    void* read = mc_snapshot_read_region(source, region, destination, byte_size);
+    xbt_test_assert(!memcmp(source, read, byte_size), "Mismatch in mc_snapshot_read_region()");
+
+    xbt_test_add("Reading parts of region data for %i page(s)", n);
     for(int j=0; j!=100; ++j) {
       size_t offset = rand() % byte_size;
       size_t size = rand() % (byte_size - offset);
       void* read = mc_snapshot_read_region((char*) source+offset, region, destination, size);
-      xbt_test_assert(!memcmp((char*) source+offset, read, size), "Mismatch in mc_snapshot_read_region()");
+      xbt_test_assert(!memcmp((char*) source+offset, read, size),
+        "Mismatch in mc_snapshot_read_region()");
     }
 
-    xbt_test_add("Compare region data for %i page(s)", n);
+    xbt_test_add("Compare whole region data for %i page(s)", n);
+    xbt_test_assert(!mc_snapshot_region_memcmp(source, NULL, source, region, byte_size),
+      "Mismatch in mc_snapshot_region_memcmp() for the whole region");
+    xbt_test_assert(mc_snapshot_region_memcmp(source, region0, source, region, byte_size),
+      "Unexpected match in mc_snapshot_region_memcmp() with previous snapshot");
+
+    xbt_test_add("Compare parts of region data for %i page(s) with current value", n);
     for(int j=0; j!=100; ++j) {
       size_t offset = rand() % byte_size;
       size_t size = rand() % (byte_size - offset);
@@ -194,11 +251,18 @@ XBT_TEST_UNIT("page_region", test_snapshot_page_read, "Test page snapshots")
         "Mismatch in mc_snapshot_region_memcmp()");
     }
 
+    xbt_test_add("Compare parts of region data for %i page(s) with itself", n);
+    for(int j=0; j!=100; ++j) {
+      size_t offset = rand() % byte_size;
+      size_t size = rand() % (byte_size - offset);
+      xbt_test_assert(!mc_snapshot_region_memcmp((char*) source+offset, region, (char*) source+offset, region, size),
+        "Mismatch in mc_snapshot_region_memcmp()");
+    }
 
     if (n==1) {
       xbt_test_add("Read pointer for %i page(s)", n);
       memcpy(source, &mc_model_checker, sizeof(void*));
-      mc_mem_region_t region2 = mc_region_new_sparse(0, source, byte_size, NULL);
+      mc_mem_region_t region2 = mc_region_new_sparse(MC_REGION_TYPE_UNKNOWN, source, source, byte_size, NULL);
       xbt_test_assert(mc_snapshot_read_pointer_region(source, region2) == mc_model_checker,
         "Mismtach in mc_snapshot_read_pointer_region()");
       MC_region_destroy(region2);
@@ -216,4 +280,3 @@ XBT_TEST_UNIT("page_region", test_snapshot_page_read, "Test page snapshots")
 }
 
 #endif /* SIMGRID_TEST */
-