#include <unistd.h>
#include <string.h> // memcpy, memcp
+#include <sys/mman.h>
+
#include <boost/foreach.hpp>
#include <xbt.h>
void s_mc_pages_store::remove_page(size_t pageno)
{
this->free_pages_.push_back(pageno);
- void* page = mc_page_from_number(this->memory_, pageno);
+ const void* page = this->get_page(pageno);
uint64_t hash = mc_hash_page(page);
this->hash_index_[hash].erase(pageno);
}
// Otherwise, a new page is allocated in the page store and the content
// of the page is `memcpy()`-ed to this new page.
size_t pageno = alloc_page();
+ xbt_assert(this->page_counts_[pageno]==0, "Allocated page is already used");
void* snapshot_page = (void*) this->get_page(pageno);
memcpy(snapshot_page, page, xbt_pagesize);
page_set.insert(pageno);
return new s_mc_pages_store_t(500);
}
+void mc_pages_store_delete(mc_pages_store_t store)
+{
+ delete store;
+}
+
+}
+
+#ifdef SIMGRID_TEST
+
+#include <string.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <sys/mman.h>
+
+#include <memory>
+
+#include "mc/mc_page_store.h"
+
+static int value = 0;
+
+static void new_content(void* data, size_t size)
+{
+ memset(data, ++value, size);
}
+
+static void* getpage()
+{
+ return mmap(NULL, getpagesize(), PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
+}
+
+extern "C" {
+
+XBT_TEST_SUITE("mc_page_store", "Page store");
+
+XBT_TEST_UNIT("base", test_mc_page_store, "Test adding/removing pages in the store")
+{
+ xbt_test_add("Init");
+ size_t pagesize = (size_t) getpagesize();
+ std::auto_ptr<s_mc_pages_store_t> store = std::auto_ptr<s_mc_pages_store_t>(new s_mc_pages_store(500));
+ void* data = getpage();
+ xbt_test_assert(store->size()==0, "Bad size");
+
+ xbt_test_add("Store the page once");
+ new_content(data, pagesize);
+ size_t pageno1 = store->store_page(data);
+ xbt_test_assert(store->get_ref(pageno1)==1, "Bad refcount");
+ const void* copy = store->get_page(pageno1);
+ xbt_test_assert(memcmp(data, copy, pagesize)==0, "Page data should be the same");
+ xbt_test_assert(store->size()==1, "Bad size");
+
+ xbt_test_add("Store the same page again");
+ size_t pageno2 = store->store_page(data);
+ xbt_test_assert(pageno1==pageno2, "Page should be the same");
+ xbt_test_assert(store->get_ref(pageno1)==2, "Bad refcount");
+ xbt_test_assert(store->size()==1, "Bad size");
+
+ xbt_test_add("Store a new page");
+ new_content(data, pagesize);
+ size_t pageno3 = store->store_page(data);
+ xbt_test_assert(pageno1 != pageno3, "New page should be different");
+ xbt_test_assert(store->size()==2, "Bad size");
+
+ xbt_test_add("Unref pages");
+ store->unref_page(pageno1);
+ xbt_assert(store->get_ref(pageno1)==1, "Bad refcount");
+ xbt_assert(store->size()==2, "Bad size");
+ store->unref_page(pageno2);
+ xbt_test_assert(store->size()==1, "Bad size");
+
+ xbt_test_add("Reallocate page");
+ new_content(data, pagesize);
+ size_t pageno4 = store->store_page(data);
+ xbt_test_assert(pageno1 == pageno4, "Page was not reused");
+ xbt_test_assert(store->get_ref(pageno4)==1, "Bad refcount");
+ xbt_test_assert(store->size()==2, "Bad size");
+}
+
+}
+
+#endif /* SIMGRID_TEST */