#ifndef SIMGRID_MC_PAGESTORE_HPP
#define SIMGRID_MC_PAGESTORE_HPP
-#include <stdint.h>
-
+#include <cstdint>
#include <vector>
-#include <boost/array.hpp>
-#include <boost/utility.hpp>
-#include <boost/unordered_map.hpp>
-#include <boost/unordered_set.hpp>
+#include <unordered_map>
+#include <unordered_set>
-#include <xbt.h>
+#include "xbt/base.h"
-#include "mc_mmu.h"
-#include "mc_forward.h"
+#include "src/mc/mc_mmu.h"
+#include "src/mc/mc_forward.hpp"
namespace simgrid {
namespace mc {
/** @brief Storage for snapshot memory pages
*
- * The first (lower) layer of the per-page snapshot mechanism is a page
- * store: it's responsibility is to store immutable shareable
- * reference-counted memory pages independently of the snapshoting
- * logic. Snapshot management and representation, soft-dirty tracking is
- * handled to an higher layer. READMORE
+ * The first (lower) layer of the per-page snapshot mechanism is a page store:
+ * its responsibility is to store immutable sharable reference-counted memory
+ * pages independently of the snapshotting logic. Snapshot management and
+ * representation is handled to an higher layer. READMORE
*
* Data structure:
*
*/
class PageStore {
public: // Types
-#ifdef MC_PAGE_STORE_MD4
- typedef boost::array<uint64_t,2> hash_type;
-#else
- typedef uint64_t hash_type;
-#endif
+ typedef std::uint64_t hash_type;
private: // Types
-#ifdef MC_PAGE_STORE_MD4
- // We are using a secure hash to identify a page.
- // We assume there will not be any collision: we need to map a hash
- // to a single page index.
- typedef boost::unordered_map<hash_type, size_t> pages_map_type;
-#else
// We are using a cheap hash to index a page.
// We should expect collision and we need to associate multiple page indices
// to the same hash.
- typedef boost::unordered_set<size_t> page_set_type;
- typedef boost::unordered_map<hash_type, page_set_type> pages_map_type;
-#endif
+ typedef std::unordered_set<std::size_t> page_set_type;
+ typedef std::unordered_map<hash_type, page_set_type> pages_map_type;
private: // Fields:
- /** First page
- *
- * mc_page_store_get_page expects that this is the first field.
- * */
+ /** First page */
void* memory_;
/** Number of available pages in virtual memory */
- size_t capacity_;
+ std::size_t capacity_;
/** Top of the used pages (index of the next available page) */
- size_t top_index_;
+ std::size_t top_index_;
/** Page reference count */
- std::vector<uint64_t> page_counts_;
+ std::vector<std::uint64_t> page_counts_;
/** Index of available pages before the top */
- std::vector<size_t> free_pages_;
+ std::vector<std::size_t> free_pages_;
/** Index from page hash to page index */
pages_map_type hash_index_;
private: // Methods
- void resize(size_t size);
- size_t alloc_page();
- void remove_page(size_t pageno);
+ void resize(std::size_t size);
+ std::size_t alloc_page();
+ void remove_page(std::size_t pageno);
public: // Constructors
PageStore(PageStore const&) = delete;
PageStore& operator=(PageStore const&) = delete;
- explicit PageStore(size_t size);
+ explicit PageStore(std::size_t size);
~PageStore();
public: // Methods
/** @brief Decrement the reference count for a given page
*
- * Decrement the reference count of this page. Used when a snapshot is
- * destroyed.
+ * Decrement the reference count of this page. Used when a snapshot is destroyed.
*
* If the reference count reaches zero, the page is recycled:
* it is added to the `free_pages_` list and removed from the `hash_index_`.
*
* */
- void unref_page(size_t pageno);
+ void unref_page(std::size_t pageno);
/** @brief Increment the refcount for a given page
*
void ref_page(size_t pageno);
/** @brief Store a page in the page store */
- size_t store_page(void* page);
+ std::size_t store_page(void* page);
/** @brief Get a page from its page number
*
- * @param Number of the memory page in the store
+ * @param pageno Number of the memory page in the store
* @return Start of the page
*/
- const void* get_page(size_t pageno) const;
+ const void* get_page(std::size_t pageno) const;
public: // Debug/test methods
/** @brief Get the number of references for a page */
- size_t get_ref(size_t pageno);
+ std::size_t get_ref(std::size_t pageno);
/** @brief Get the number of used pages */
- size_t size();
+ std::size_t size();
/** @brief Get the capacity of the page store
*
* The capacity is expanded by a system call (mremap).
* */
- size_t capacity();
+ std::size_t capacity();
};
-inline __attribute__((always_inline))
-void PageStore::unref_page(size_t pageno) {
- if ((--this->page_counts_[pageno]) == 0) {
+XBT_ALWAYS_INLINE void PageStore::unref_page(std::size_t pageno)
+{
+ if ((--this->page_counts_[pageno]) == 0)
this->remove_page(pageno);
- }
}
-inline __attribute__((always_inline))
-void PageStore::ref_page(size_t pageno) {
+XBT_ALWAYS_INLINE void PageStore::ref_page(size_t pageno)
+{
++this->page_counts_[pageno];
}
-inline __attribute__((always_inline))
-const void* PageStore::get_page(size_t pageno) const {
- return mc_page_from_number(this->memory_, pageno);
+XBT_ALWAYS_INLINE const void* PageStore::get_page(std::size_t pageno) const
+{
+ return (void*) simgrid::mc::mmu::join(pageno, (std::uintptr_t) this->memory_);
}
-inline __attribute__((always_inline))
-size_t PageStore::get_ref(size_t pageno) {
+XBT_ALWAYS_INLINE std::size_t PageStore::get_ref(std::size_t pageno)
+{
return this->page_counts_[pageno];
}
-inline __attribute__((always_inline))
-size_t PageStore::size() {
+XBT_ALWAYS_INLINE std::size_t PageStore::size()
+{
return this->top_index_ - this->free_pages_.size();
}
-inline __attribute__((always_inline))
-size_t PageStore::capacity() {
+XBT_ALWAYS_INLINE std::size_t PageStore::capacity()
+{
return this->capacity_;
}
