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@ -66,31 +66,64 @@ VOID ResetPageCacheHitInfo(int *try, int *hit)
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#define TRACE_TRY_CACHE()
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#define TRACE_HIT_CACHE()
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#endif
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<<<<<<< HEAD
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#ifdef LOSCFG_KERNEL_VM
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=======
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#ifdef LOSCFG_KERNEL_VM
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/**
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* @brief
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@verbatim
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增加文件页到页高速缓存(page cache)
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LosFilePage将一个文件切成了一页一页,因为读文件过程随机seek,所以文件页也不会是连续的,
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pgoff记录文件的位置,并确保在cache的文件数据是按顺序排列的.
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@endverbatim
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* @param page
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* @param mapping
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* @param pgoff
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* @return STATIC
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*/
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>>>>>>> remotes/origin/main
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STATIC VOID OsPageCacheAdd(LosFilePage *page, struct page_mapping *mapping, VM_OFFSET_T pgoff)
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{
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LosFilePage *fpage = NULL;
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<<<<<<< HEAD
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LOS_DL_LIST_FOR_EACH_ENTRY(fpage, &mapping->page_list, LosFilePage, node) {
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if (fpage->pgoff > pgoff) {
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LOS_ListTailInsert(&fpage->node, &page->node);
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=======
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LOS_DL_LIST_FOR_EACH_ENTRY(fpage, &mapping->page_list, LosFilePage, node) {//遍历page_list链表
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if (fpage->pgoff > pgoff) {//插入的条件,这样插入保证了按pgoff 从小到大排序
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LOS_ListTailInsert(&fpage->node, &page->node);//等于挂到fpage节点的前面了
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>>>>>>> remotes/origin/main
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goto done_add;
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}
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}
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<<<<<<< HEAD
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LOS_ListTailInsert(&mapping->page_list, &page->node);
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done_add:
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mapping->nrpages++;
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}
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=======
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LOS_ListTailInsert(&mapping->page_list, &page->node);//将页挂到文件映射的链表上,相当于挂到了最后
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done_add:
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mapping->nrpages++; //文件在缓存中多了一个 文件页
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}
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///将页面加到活动文件页LRU链表上
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>>>>>>> remotes/origin/main
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VOID OsAddToPageacheLru(LosFilePage *page, struct page_mapping *mapping, VM_OFFSET_T pgoff)
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{
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OsPageCacheAdd(page, mapping, pgoff);
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OsLruCacheAdd(page, VM_LRU_ACTIVE_FILE);
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}
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<<<<<<< HEAD
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VOID OsPageCacheDel(LosFilePage *fpage)
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{
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@ -108,15 +141,44 @@ VOID OsPageCacheDel(LosFilePage *fpage)
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LOS_MemFree(m_aucSysMem0, fpage);
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}
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=======
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///从页高速缓存上删除页
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VOID OsPageCacheDel(LosFilePage *fpage)
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{
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/* delete from file cache list */
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LOS_ListDelete(&fpage->node);//将自己从链表上摘除
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fpage->mapping->nrpages--;//文件映射的页总数减少
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/* unmap and remove map info */
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if (OsIsPageMapped(fpage)) {//是否映射过
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OsUnmapAllLocked(fpage);
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}
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LOS_PhysPageFree(fpage->vmPage);//释放物理内存
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LOS_MemFree(m_aucSysMem0, fpage);//释放文件页结构体内存
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}
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/**************************************************************************************************
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每个进程都有自己的地址空间, 多个进程可以访问同一个LosFilePage,每个进程使用的虚拟地址都需要单独映射
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所以同一个LosFilePage会映射到多个进程空间.本函数记录页面被哪些进程映射过
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在两个地方会被被空间映射
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1.缺页中断 2.克隆地址空间
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**************************************************************************************************/
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>>>>>>> remotes/origin/main
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VOID OsAddMapInfo(LosFilePage *page, LosArchMmu *archMmu, VADDR_T vaddr)
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{
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LosMapInfo *info = NULL;
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<<<<<<< HEAD
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info = (LosMapInfo *)LOS_MemAlloc(m_aucSysMem0, sizeof(LosMapInfo));
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=======
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info = (LosMapInfo *)LOS_MemAlloc(m_aucSysMem0, sizeof(LosMapInfo));//分配一个映射信息
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>>>>>>> remotes/origin/main
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if (info == NULL) {
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VM_ERR("OsAddMapInfo alloc memory failed!");
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return;
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}
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<<<<<<< HEAD
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info->page = page;
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info->archMmu = archMmu;
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info->vaddr = vaddr;
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@ -147,17 +209,57 @@ VOID OsDeletePageCacheLru(LosFilePage *page)
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OsPageCacheDel(page);
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}
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=======
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info->page = page; //文件页
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info->archMmu = archMmu;//进程MMU,完成虚实地址转换
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info->vaddr = vaddr; //虚拟地址
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LOS_ListAdd(&page->i_mmap, &info->node);//将 LosMapInfo 节点挂入链表
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page->n_maps++;//映射总数++
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}
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///通过虚拟地址获取文件页映射信息,archMmu每个进程都有属于自己的mmu
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LosMapInfo *OsGetMapInfo(const LosFilePage *page, const LosArchMmu *archMmu, VADDR_T vaddr)
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{
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LosMapInfo *info = NULL;
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const LOS_DL_LIST *immap = &page->i_mmap;//一个文件页被多个进程映射
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LOS_DL_LIST_FOR_EACH_ENTRY(info, immap, LosMapInfo, node) {//遍历每个节点
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if ((info->archMmu == archMmu) && (info->vaddr == vaddr) && (info->page == page)) {//全等时返回
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return info;
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}
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}
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return NULL;
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}
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///删除页高速缓存和LRU,对应 OsAddToPageacheLru
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VOID OsDeletePageCacheLru(LosFilePage *page)
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{
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/* delete form lru list */
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OsLruCacheDel(page); //将页面从lru列表中删除
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/* delete from cache lits and free pmm if need */
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OsPageCacheDel(page); //从page缓存中删除
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}
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//解除文件页和进程的映射关系
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>>>>>>> remotes/origin/main
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STATIC VOID OsPageCacheUnmap(LosFilePage *fpage, LosArchMmu *archMmu, VADDR_T vaddr)
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{
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UINT32 intSave;
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LosMapInfo *info = NULL;
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LOS_SpinLockSave(&fpage->physSeg->lruLock, &intSave);
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<<<<<<< HEAD
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info = OsGetMapInfo(fpage, archMmu, vaddr);
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if (info == NULL) {
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VM_ERR("OsPageCacheUnmap get map info failed!");
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} else {
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OsUnmapPageLocked(fpage, info);
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=======
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info = OsGetMapInfo(fpage, archMmu, vaddr);//获取文件页在进程的映射信息
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if (info == NULL) {
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VM_ERR("OsPageCacheUnmap get map info failed!");
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} else {
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OsUnmapPageLocked(fpage, info);//解除进程和文件页映射关系
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>>>>>>> remotes/origin/main
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}
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if (!(OsIsPageMapped(fpage) && ((fpage->flags & VM_MAP_REGION_FLAG_PERM_EXECUTE) ||
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OsIsPageDirty(fpage->vmPage)))) {
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@ -166,7 +268,11 @@ STATIC VOID OsPageCacheUnmap(LosFilePage *fpage, LosArchMmu *archMmu, VADDR_T va
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LOS_SpinUnlockRestore(&fpage->physSeg->lruLock, intSave);
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}
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<<<<<<< HEAD
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=======
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///删除文件
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>>>>>>> remotes/origin/main
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VOID OsVmmFileRemove(LosVmMapRegion *region, LosArchMmu *archMmu, VM_OFFSET_T pgoff)
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{
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UINT32 intSave;
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@ -179,6 +285,7 @@ VOID OsVmmFileRemove(LosVmMapRegion *region, LosArchMmu *archMmu, VM_OFFSET_T pg
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LosVmPage *mapPage = NULL;
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if (!LOS_IsRegionFileValid(region) || (region->unTypeData.rf.vnode == NULL)) {
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<<<<<<< HEAD
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return;
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}
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vnode = region->unTypeData.rf.vnode;
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@ -186,10 +293,20 @@ VOID OsVmmFileRemove(LosVmMapRegion *region, LosArchMmu *archMmu, VM_OFFSET_T pg
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vaddr = region->range.base + ((UINT32)(pgoff - region->pgOff) << PAGE_SHIFT);
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status_t status = LOS_ArchMmuQuery(archMmu, vaddr, &paddr, NULL);
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=======
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return;//判断是否为文件映射，是否已map
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}
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vnode = region->unTypeData.rf.vnode;
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mapping = &vnode->mapping;
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vaddr = region->range.base + ((UINT32)(pgoff - region->pgOff) << PAGE_SHIFT);//得到虚拟地址
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status_t status = LOS_ArchMmuQuery(archMmu, vaddr, &paddr, NULL);//获取物理地址
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>>>>>>> remotes/origin/main
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if (status != LOS_OK) {
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return;
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}
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<<<<<<< HEAD
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mapPage = LOS_VmPageGet(paddr);
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/* is page is in cache list */
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@ -204,6 +321,22 @@ VOID OsVmmFileRemove(LosVmMapRegion *region, LosArchMmu *archMmu, VM_OFFSET_T pg
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OsPageCacheUnmap(fpage, archMmu, vaddr);
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if (OsIsPageDirty(fpage->vmPage)) {
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tmpPage = OsDumpDirtyPage(fpage);
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=======
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mapPage = LOS_VmPageGet(paddr);//获取物理页框
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/* is page is in cache list */
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LOS_SpinLockSave(&mapping->list_lock, &intSave);
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fpage = OsFindGetEntry(mapping, pgoff);//获取fpage
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/* no cache or have cache but not map(cow), free it direct */
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if ((fpage == NULL) || (fpage->vmPage != mapPage)) {//没有缓存或有缓存但没有映射（cow），直接释放它
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LOS_PhysPageFree(mapPage);//释放物理页框
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LOS_ArchMmuUnmap(archMmu, vaddr, 1);//取消虚拟地址的映射
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/* this is a page cache map! */
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} else {
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OsPageCacheUnmap(fpage, archMmu, vaddr);////取消缓存中的映射
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if (OsIsPageDirty(fpage->vmPage)) {//脏页处理
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tmpPage = OsDumpDirtyPage(fpage);//dump 脏页
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>>>>>>> remotes/origin/main
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}
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}
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LOS_SpinUnlockRestore(&mapping->list_lock, intSave);
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@ -213,6 +346,7 @@ VOID OsVmmFileRemove(LosVmMapRegion *region, LosArchMmu *archMmu, VM_OFFSET_T pg
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}
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return;
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}
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<<<<<<< HEAD
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VOID OsMarkPageDirty(LosFilePage *fpage, const LosVmMapRegion *region, INT32 off, INT32 len)
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{
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@ -222,6 +356,17 @@ VOID OsMarkPageDirty(LosFilePage *fpage, const LosVmMapRegion *region, INT32 off
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fpage->dirtyEnd = len;
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} else {
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OsSetPageDirty(fpage->vmPage);
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=======
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///标记page为脏页 进程修改了高速缓存里的数据时，该页就被内核标记为脏页
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VOID OsMarkPageDirty(LosFilePage *fpage, const LosVmMapRegion *region, INT32 off, INT32 len)
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{
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if (region != NULL) {
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OsSetPageDirty(fpage->vmPage);//设置为脏页
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fpage->dirtyOff = off;//脏页偏移位置
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fpage->dirtyEnd = len;//脏页结束位置
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} else {
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OsSetPageDirty(fpage->vmPage);//设置为脏页
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>>>>>>> remotes/origin/main
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if ((off + len) > fpage->dirtyEnd) {
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fpage->dirtyEnd = off + len;
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}
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@ -258,22 +403,37 @@ STATIC UINT32 GetDirtySize(LosFilePage *fpage, struct Vnode *vnode)
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return PAGE_SIZE;
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}
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<<<<<<< HEAD
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=======
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///冲洗脏页，回写磁盘
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>>>>>>> remotes/origin/main
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STATIC INT32 OsFlushDirtyPage(LosFilePage *fpage)
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{
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UINT32 ret;
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size_t len;
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char *buff = NULL;
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<<<<<<< HEAD
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struct Vnode *vnode = fpage->mapping->host;
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=======
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struct Vnode *vnode = fpage->mapping->host;/* owner of this mapping */ //此映射属于哪个文件,注意<file,page_mapping>是1:1的关系.
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>>>>>>> remotes/origin/main
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if (vnode == NULL) {
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VM_ERR("page cache vnode error");
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return LOS_NOK;
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}
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<<<<<<< HEAD
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len = fpage->dirtyEnd - fpage->dirtyOff;
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len = (len == 0) ? GetDirtySize(fpage, vnode) : len;
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if (len == 0) {
|
|
|
|
|
OsCleanPageDirty(fpage->vmPage);
|
|
|
|
|
=======
|
|
|
|
|
len = fpage->dirtyEnd - fpage->dirtyOff;//计算出脏数据长度
|
|
|
|
|
len = (len == 0) ? GetDirtySize(fpage, vnode) : len;
|
|
|
|
|
if (len == 0) {//没有脏数据
|
|
|
|
|
OsCleanPageDirty(fpage->vmPage);//页面取消脏标签
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
return LOS_OK;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
@ -290,7 +450,11 @@ STATIC INT32 OsFlushDirtyPage(LosFilePage *fpage)
|
|
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
|
|
|
|
|
=======
|
|
|
|
|
///备份脏页,老脏页撕掉脏页标签
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
LosFilePage *OsDumpDirtyPage(LosFilePage *oldFPage)
|
|
|
|
|
{
|
|
|
|
|
LosFilePage *newFPage = NULL;
|
|
|
|
|
@ -302,11 +466,19 @@ LosFilePage *OsDumpDirtyPage(LosFilePage *oldFPage)
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
OsCleanPageDirty(oldFPage->vmPage);
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
(VOID)memcpy_s(newFPage, sizeof(LosFilePage), oldFPage, sizeof(LosFilePage));
|
|
|
|
|
|
|
|
|
|
return newFPage;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
=======
|
|
|
|
|
(VOID)memcpy_s(newFPage, sizeof(LosFilePage), oldFPage, sizeof(LosFilePage));//直接内存拷贝
|
|
|
|
|
|
|
|
|
|
return newFPage;
|
|
|
|
|
}
|
|
|
|
|
///冲洗脏页数据,将脏页数据回写磁盘
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
VOID OsDoFlushDirtyPage(LosFilePage *fpage)
|
|
|
|
|
{
|
|
|
|
|
if (fpage == NULL) {
|
|
|
|
|
@ -328,7 +500,11 @@ STATIC VOID OsReleaseFpage(struct page_mapping *mapping, LosFilePage *fpage)
|
|
|
|
|
LOS_SpinUnlockRestore(lruLock, lruSave);
|
|
|
|
|
LOS_SpinUnlockRestore(&mapping->list_lock, intSave);
|
|
|
|
|
}
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
|
|
|
|
|
=======
|
|
|
|
|
///删除映射信息
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
VOID OsDelMapInfo(LosVmMapRegion *region, LosVmPgFault *vmf, BOOL cleanDirty)
|
|
|
|
|
{
|
|
|
|
|
UINT32 intSave;
|
|
|
|
|
@ -349,9 +525,15 @@ VOID OsDelMapInfo(LosVmMapRegion *region, LosVmPgFault *vmf, BOOL cleanDirty)
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (cleanDirty) {
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
OsCleanPageDirty(fpage->vmPage);
|
|
|
|
|
}
|
|
|
|
|
info = OsGetMapInfo(fpage, ®ion->space->archMmu, (vaddr_t)vmf->vaddr);
|
|
|
|
|
=======
|
|
|
|
|
OsCleanPageDirty(fpage->vmPage);//恢复干净页
|
|
|
|
|
}
|
|
|
|
|
info = OsGetMapInfo(fpage, ®ion->space->archMmu, (vaddr_t)vmf->vaddr);//通过虚拟地址获取映射信息
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
if (info != NULL) {
|
|
|
|
|
fpage->n_maps--;
|
|
|
|
|
LOS_ListDelete(&info->node);
|
|
|
|
|
@ -362,7 +544,14 @@ VOID OsDelMapInfo(LosVmMapRegion *region, LosVmPgFault *vmf, BOOL cleanDirty)
|
|
|
|
|
}
|
|
|
|
|
LOS_SpinUnlockRestore(&mapping->list_lock, intSave);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
|
|
|
|
|
=======
|
|
|
|
|
/*!
|
|
|
|
|
文件缺页时的处理,先读入磁盘数据，再重新读页数据
|
|
|
|
|
被 OsDoReadFault(...),OsDoCowFault(...),OsDoSharedFault(...) 等调用
|
|
|
|
|
*/
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
INT32 OsVmmFileFault(LosVmMapRegion *region, LosVmPgFault *vmf)
|
|
|
|
|
{
|
|
|
|
|
INT32 ret;
|
|
|
|
|
@ -374,7 +563,11 @@ INT32 OsVmmFileFault(LosVmMapRegion *region, LosVmPgFault *vmf)
|
|
|
|
|
struct page_mapping *mapping = NULL;
|
|
|
|
|
LosFilePage *fpage = NULL;
|
|
|
|
|
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
if (!LOS_IsRegionFileValid(region) || (region->unTypeData.rf.vnode == NULL) || (vmf == NULL)) {
|
|
|
|
|
=======
|
|
|
|
|
if (!LOS_IsRegionFileValid(region) || (region->unTypeData.rf.vnode == NULL) || (vmf == NULL)) {//文件是否映射到了内存
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
VM_ERR("Input param is NULL");
|
|
|
|
|
return LOS_NOK;
|
|
|
|
|
}
|
|
|
|
|
@ -383,6 +576,7 @@ INT32 OsVmmFileFault(LosVmMapRegion *region, LosVmPgFault *vmf)
|
|
|
|
|
|
|
|
|
|
/* get or create a new cache node */
|
|
|
|
|
LOS_SpinLockSave(&mapping->list_lock, &intSave);
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
fpage = OsFindGetEntry(mapping, vmf->pgoff);
|
|
|
|
|
TRACE_TRY_CACHE();
|
|
|
|
|
if (fpage != NULL) {
|
|
|
|
|
@ -390,11 +584,21 @@ INT32 OsVmmFileFault(LosVmMapRegion *region, LosVmPgFault *vmf)
|
|
|
|
|
OsPageRefIncLocked(fpage);
|
|
|
|
|
} else {
|
|
|
|
|
fpage = OsPageCacheAlloc(mapping, vmf->pgoff);
|
|
|
|
|
=======
|
|
|
|
|
fpage = OsFindGetEntry(mapping, vmf->pgoff);//获取文件页
|
|
|
|
|
TRACE_TRY_CACHE();
|
|
|
|
|
if (fpage != NULL) {//找到了,说明该页已经在页高速缓存中
|
|
|
|
|
TRACE_HIT_CACHE();
|
|
|
|
|
OsPageRefIncLocked(fpage);
|
|
|
|
|
} else {//真的缺页了,页高速缓存中没找到
|
|
|
|
|
fpage = OsPageCacheAlloc(mapping, vmf->pgoff);//分配一个文件页，将数据初始化好，包括vmpage(物理页框)
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
if (fpage == NULL) {
|
|
|
|
|
LOS_SpinUnlockRestore(&mapping->list_lock, intSave);
|
|
|
|
|
VM_ERR("Failed to alloc a page frame");
|
|
|
|
|
return LOS_NOK;
|
|
|
|
|
}
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
newCache = true;
|
|
|
|
|
}
|
|
|
|
|
OsSetPageLocked(fpage->vmPage);
|
|
|
|
|
@ -403,6 +607,16 @@ INT32 OsVmmFileFault(LosVmMapRegion *region, LosVmPgFault *vmf)
|
|
|
|
|
|
|
|
|
|
/* read file to new page cache */
|
|
|
|
|
if (newCache) {
|
|
|
|
|
=======
|
|
|
|
|
newCache = true;//分配了新文件页
|
|
|
|
|
}
|
|
|
|
|
OsSetPageLocked(fpage->vmPage);//对vmpage上锁
|
|
|
|
|
LOS_SpinUnlockRestore(&mapping->list_lock, intSave);
|
|
|
|
|
kvaddr = OsVmPageToVaddr(fpage->vmPage);//获取该页框在内核空间的虚拟地址,因为 page cache本身就是在内核空间,
|
|
|
|
|
|
|
|
|
|
/* read file to new page cache */
|
|
|
|
|
if (newCache) {//新cache
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
ret = vnode->vop->ReadPage(vnode, kvaddr, fpage->pgoff << PAGE_SHIFT);
|
|
|
|
|
if (ret == 0) {
|
|
|
|
|
VM_ERR("Failed to read from file!");
|
|
|
|
|
@ -410,18 +624,27 @@ INT32 OsVmmFileFault(LosVmMapRegion *region, LosVmPgFault *vmf)
|
|
|
|
|
return LOS_NOK;
|
|
|
|
|
}
|
|
|
|
|
LOS_SpinLockSave(&mapping->list_lock, &intSave);
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
OsAddToPageacheLru(fpage, mapping, vmf->pgoff);
|
|
|
|
|
=======
|
|
|
|
|
OsAddToPageacheLru(fpage, mapping, vmf->pgoff);//将fpage挂入pageCache 和 LruCache
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
LOS_SpinUnlockRestore(&mapping->list_lock, intSave);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
LOS_SpinLockSave(&mapping->list_lock, &intSave);
|
|
|
|
|
/* cow fault case no need to save mapinfo */
|
|
|
|
|
if (!((vmf->flags & VM_MAP_PF_FLAG_WRITE) && !(region->regionFlags & VM_MAP_REGION_FLAG_SHARED))) {
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
OsAddMapInfo(fpage, ®ion->space->archMmu, (vaddr_t)vmf->vaddr);
|
|
|
|
|
=======
|
|
|
|
|
OsAddMapInfo(fpage, ®ion->space->archMmu, (vaddr_t)vmf->vaddr);//添加<虚拟地址,文件页>的映射关系,如此进程以后就能通过虚拟地址操作文件页了.
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
fpage->flags = region->regionFlags;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* share page fault, mark the page dirty */
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
if ((vmf->flags & VM_MAP_PF_FLAG_WRITE) && (region->regionFlags & VM_MAP_REGION_FLAG_SHARED)) {
|
|
|
|
|
OsMarkPageDirty(fpage, region, 0, 0);
|
|
|
|
|
}
|
|
|
|
|
@ -431,11 +654,26 @@ INT32 OsVmmFileFault(LosVmMapRegion *region, LosVmPgFault *vmf)
|
|
|
|
|
return LOS_OK;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
=======
|
|
|
|
|
if ((vmf->flags & VM_MAP_PF_FLAG_WRITE) && (region->regionFlags & VM_MAP_REGION_FLAG_SHARED)) {//有过写操作或者为共享线性区
|
|
|
|
|
OsMarkPageDirty(fpage, region, 0, 0);//标记为脏页,要回写磁盘,内核会在适当的时候回写磁盘
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
vmf->pageKVaddr = kvaddr;//缺陷页记录文件页的虚拟地址
|
|
|
|
|
LOS_SpinUnlockRestore(&mapping->list_lock, intSave);
|
|
|
|
|
return LOS_OK;
|
|
|
|
|
}
|
|
|
|
|
///文件缓存冲洗,把所有fpage冲洗一边，把脏页洗到dirtyList中,配合OsFileCacheRemove理解
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
VOID OsFileCacheFlush(struct page_mapping *mapping)
|
|
|
|
|
{
|
|
|
|
|
UINT32 intSave;
|
|
|
|
|
UINT32 lruLock;
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
LOS_DL_LIST_HEAD(dirtyList);
|
|
|
|
|
=======
|
|
|
|
|
LOS_DL_LIST_HEAD(dirtyList);//LOS_DL_LIST list = { &(list), &(list) };
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
LosFilePage *ftemp = NULL;
|
|
|
|
|
LosFilePage *fpage = NULL;
|
|
|
|
|
|
|
|
|
|
@ -443,33 +681,59 @@ VOID OsFileCacheFlush(struct page_mapping *mapping)
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
LOS_SpinLockSave(&mapping->list_lock, &intSave);
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
LOS_DL_LIST_FOR_EACH_ENTRY(fpage, &mapping->page_list, LosFilePage, node) {
|
|
|
|
|
LOS_SpinLockSave(&fpage->physSeg->lruLock, &lruLock);
|
|
|
|
|
if (OsIsPageDirty(fpage->vmPage)) {
|
|
|
|
|
ftemp = OsDumpDirtyPage(fpage);
|
|
|
|
|
if (ftemp != NULL) {
|
|
|
|
|
LOS_ListTailInsert(&dirtyList, &ftemp->node);
|
|
|
|
|
=======
|
|
|
|
|
LOS_DL_LIST_FOR_EACH_ENTRY(fpage, &mapping->page_list, LosFilePage, node) {//循环从page_list中取node给fpage
|
|
|
|
|
LOS_SpinLockSave(&fpage->physSeg->lruLock, &lruLock);
|
|
|
|
|
if (OsIsPageDirty(fpage->vmPage)) {//是否为脏页
|
|
|
|
|
ftemp = OsDumpDirtyPage(fpage);//这里挺妙的，copy出一份新页，老页变成了非脏页继续用
|
|
|
|
|
if (ftemp != NULL) {
|
|
|
|
|
LOS_ListTailInsert(&dirtyList, &ftemp->node);//将新页插入脏页List,等待回写磁盘
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
LOS_SpinUnlockRestore(&fpage->physSeg->lruLock, lruLock);
|
|
|
|
|
}
|
|
|
|
|
LOS_SpinUnlockRestore(&mapping->list_lock, intSave);
|
|
|
|
|
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
LOS_DL_LIST_FOR_EACH_ENTRY_SAFE(fpage, ftemp, &dirtyList, LosFilePage, node) {
|
|
|
|
|
OsDoFlushDirtyPage(fpage);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
=======
|
|
|
|
|
LOS_DL_LIST_FOR_EACH_ENTRY_SAFE(fpage, ftemp, &dirtyList, LosFilePage, node) {//仔细看这个宏，关键在 &(item)->member != (list);
|
|
|
|
|
OsDoFlushDirtyPage(fpage);//立马洗掉，所以dirtyList可以不是全局变量
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/******************************************************************************
|
|
|
|
|
删除文件缓存,清空文件在page cache的痕迹
|
|
|
|
|
参数 mapping 可理解为文件在内存的身份证
|
|
|
|
|
******************************************************************************/
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
VOID OsFileCacheRemove(struct page_mapping *mapping)
|
|
|
|
|
{
|
|
|
|
|
UINT32 intSave;
|
|
|
|
|
UINT32 lruSave;
|
|
|
|
|
SPIN_LOCK_S *lruLock = NULL;
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
LOS_DL_LIST_HEAD(dirtyList);
|
|
|
|
|
=======
|
|
|
|
|
LOS_DL_LIST_HEAD(dirtyList);//定义一个叫dirtyList的双循环链表并初始化,用于挂脏页
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
LosFilePage *ftemp = NULL;
|
|
|
|
|
LosFilePage *fpage = NULL;
|
|
|
|
|
LosFilePage *fnext = NULL;
|
|
|
|
|
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
LOS_SpinLockSave(&mapping->list_lock, &intSave);
|
|
|
|
|
LOS_DL_LIST_FOR_EACH_ENTRY_SAFE(fpage, fnext, &mapping->page_list, LosFilePage, node) {
|
|
|
|
|
lruLock = &fpage->physSeg->lruLock;
|
|
|
|
|
@ -501,12 +765,52 @@ LosVmFileOps g_commVmOps = {
|
|
|
|
|
INT32 OsVfsFileMmap(struct file *filep, LosVmMapRegion *region)
|
|
|
|
|
{
|
|
|
|
|
region->unTypeData.rf.vmFOps = &g_commVmOps;
|
|
|
|
|
=======
|
|
|
|
|
LOS_SpinLockSave(&mapping->list_lock, &intSave);//多进程操作,必须上锁.
|
|
|
|
|
LOS_DL_LIST_FOR_EACH_ENTRY_SAFE(fpage, fnext, &mapping->page_list, LosFilePage, node) {//遍历文件在内存中产生的所有文件页(例如1,4,8页)不一定连续,取决于用户的读取顺序
|
|
|
|
|
lruLock = &fpage->physSeg->lruLock;
|
|
|
|
|
LOS_SpinLockSave(lruLock, &lruSave);//@note_why 自旋锁有必要从这里开始上锁吗?
|
|
|
|
|
if (OsIsPageDirty(fpage->vmPage)) {//数据是脏页吗,脏页就是被修改过数据的页
|
|
|
|
|
ftemp = OsDumpDirtyPage(fpage);//做这个拷贝动作是为了fpage的统一下线,因为数据回写磁盘的速度是很慢的,如果直接在这里处理脏数据
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if (ftemp != NULL) {//会导致函数持有mapping->list_lock自旋锁的时间太长了,影响其他CPU的处理效率
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LOS_ListTailInsert(&dirtyList, &ftemp->node);//将临时脏页挂到记录脏页链表上
|
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}
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}
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OsDeletePageCacheLru(fpage);//删除高速缓存和从置换链表中下线
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LOS_SpinUnlockRestore(lruLock, lruSave);
|
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}
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LOS_SpinUnlockRestore(&mapping->list_lock, intSave);//恢复自旋锁,不能让别的CPU等太久
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LOS_DL_LIST_FOR_EACH_ENTRY_SAFE(fpage, fnext, &dirtyList, LosFilePage, node) {//到这里,再来慢慢的统一处理脏页数据
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OsDoFlushDirtyPage(fpage);//遍历脏页链表,一页一页处理
|
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}
|
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}
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///虚拟内存文件操作实现类
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|
LosVmFileOps g_commVmOps = {//
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.open = NULL,
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.close = NULL,
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|
|
.fault = OsVmmFileFault, //缺页中断处理
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|
.remove = OsVmmFileRemove,//删除页
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};
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//文件映射
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INT32 OsVfsFileMmap(struct file *filep, LosVmMapRegion *region)
|
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{
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region->unTypeData.rf.vmFOps = &g_commVmOps;//文件操作
|
|
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|
|
>>>>>>> remotes/origin/main
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|
|
region->unTypeData.rf.vnode = filep->f_vnode;
|
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|
|
region->unTypeData.rf.f_oflags = filep->f_oflags;
|
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|
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return ENOERR;
|
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|
}
|
|
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|
<<<<<<< HEAD
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|
=======
|
|
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|
|
/*!
|
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|
|
有名映射,可理解为文件映射,跟匿名映射相对应
|
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|
|
参数filep是广义的文件,在鸿蒙内核,目录/普通文件/字符设备/块设备/网络套接字/管道/链接 都是文件
|
|
|
|
|
*/
|
|
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|
|
>>>>>>> remotes/origin/main
|
|
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|
|
STATUS_T OsNamedMMap(struct file *filep, LosVmMapRegion *region)
|
|
|
|
|
{
|
|
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|
|
struct Vnode *vnode = NULL;
|
|
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|
|
@ -519,10 +823,17 @@ STATUS_T OsNamedMMap(struct file *filep, LosVmMapRegion *region)
|
|
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|
|
vnode->useCount++;
|
|
|
|
|
VnodeDrop();
|
|
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|
|
if (filep->ops != NULL && filep->ops->mmap != NULL) {
|
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|
|
<<<<<<< HEAD
|
|
|
|
|
if (vnode->type == VNODE_TYPE_CHR || vnode->type == VNODE_TYPE_BLK) {
|
|
|
|
|
LOS_SetRegionTypeDev(region);
|
|
|
|
|
} else {
|
|
|
|
|
LOS_SetRegionTypeFile(region);
|
|
|
|
|
=======
|
|
|
|
|
if (vnode->type == VNODE_TYPE_CHR || vnode->type == VNODE_TYPE_BLK) {//块设备或者字符设备 /dev/..
|
|
|
|
|
LOS_SetRegionTypeDev(region);//设置为设备类型
|
|
|
|
|
} else {
|
|
|
|
|
LOS_SetRegionTypeFile(region);//设置为文件类型
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
}
|
|
|
|
|
int ret = filep->ops->mmap(filep, region);
|
|
|
|
|
if (ret != LOS_OK) {
|
|
|
|
|
@ -538,10 +849,18 @@ STATUS_T OsNamedMMap(struct file *filep, LosVmMapRegion *region)
|
|
|
|
|
return LOS_OK;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
=======
|
|
|
|
|
/**************************************************************************************************
|
|
|
|
|
通过位置从文件映射页中找到的指定的文件页
|
|
|
|
|
举例:mapping->page_list上节点的数据可能只有是文件 1,3,4,6 页的数据,此时来找文件第5页的数据就会没有
|
|
|
|
|
**************************************************************************************************/
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
LosFilePage *OsFindGetEntry(struct page_mapping *mapping, VM_OFFSET_T pgoff)
|
|
|
|
|
{
|
|
|
|
|
LosFilePage *fpage = NULL;
|
|
|
|
|
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
LOS_DL_LIST_FOR_EACH_ENTRY(fpage, &mapping->page_list, LosFilePage, node) {
|
|
|
|
|
if (fpage->pgoff == pgoff) {
|
|
|
|
|
return fpage;
|
|
|
|
|
@ -549,6 +868,15 @@ LosFilePage *OsFindGetEntry(struct page_mapping *mapping, VM_OFFSET_T pgoff)
|
|
|
|
|
|
|
|
|
|
if (fpage->pgoff > pgoff) {
|
|
|
|
|
break;
|
|
|
|
|
=======
|
|
|
|
|
LOS_DL_LIST_FOR_EACH_ENTRY(fpage, &mapping->page_list, LosFilePage, node) {//遍历文件页
|
|
|
|
|
if (fpage->pgoff == pgoff) {//找到指定的页,
|
|
|
|
|
return fpage;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (fpage->pgoff > pgoff) {//大于之前还没有找到,说明不在链表中,往后的也不用找了,
|
|
|
|
|
break;//因为 mapping->page_list节点上的数据都是按 fpage->pgoff 从小到大的顺序排列的.
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
@ -556,6 +884,14 @@ LosFilePage *OsFindGetEntry(struct page_mapping *mapping, VM_OFFSET_T pgoff)
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* need mutex & change memory to dma zone. */
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
=======
|
|
|
|
|
/*!
|
|
|
|
|
以页高速缓存方式分配一个文件页 LosFilePage
|
|
|
|
|
Direct Memory Access（存储器直接访问）指一种高速的数据传输操作，允许在外部设备和存储器之间直接读写数据。
|
|
|
|
|
整个数据传输操作在一个称为"DMA控制器"的控制下进行的。CPU只需在数据传输开始和结束时做一点处理（开始和结束时候要做中断处理）
|
|
|
|
|
*/
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
LosFilePage *OsPageCacheAlloc(struct page_mapping *mapping, VM_OFFSET_T pgoff)
|
|
|
|
|
{
|
|
|
|
|
VOID *kvaddr = NULL;
|
|
|
|
|
@ -563,26 +899,44 @@ LosFilePage *OsPageCacheAlloc(struct page_mapping *mapping, VM_OFFSET_T pgoff)
|
|
|
|
|
LosVmPage *vmPage = NULL;
|
|
|
|
|
LosFilePage *fpage = NULL;
|
|
|
|
|
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
vmPage = LOS_PhysPageAlloc();
|
|
|
|
|
=======
|
|
|
|
|
vmPage = LOS_PhysPageAlloc(); //先分配一个物理页
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
if (vmPage == NULL) {
|
|
|
|
|
VM_ERR("alloc vm page failed");
|
|
|
|
|
return NULL;
|
|
|
|
|
}
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
physSeg = OsVmPhysSegGet(vmPage);
|
|
|
|
|
kvaddr = OsVmPageToVaddr(vmPage);
|
|
|
|
|
if ((physSeg == NULL) || (kvaddr == NULL)) {
|
|
|
|
|
LOS_PhysPageFree(vmPage);
|
|
|
|
|
=======
|
|
|
|
|
physSeg = OsVmPhysSegGet(vmPage);//通过页获取所在seg
|
|
|
|
|
kvaddr = OsVmPageToVaddr(vmPage);//获取内核空间的虚拟地址,具体点进去看函数说明，这里一定要理解透彻！
|
|
|
|
|
if ((physSeg == NULL) || (kvaddr == NULL)) {
|
|
|
|
|
LOS_PhysPageFree(vmPage); //异常情况要释放vmPage
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
VM_ERR("alloc vm page failed!");
|
|
|
|
|
return NULL;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
fpage = (LosFilePage *)LOS_MemAlloc(m_aucSysMem0, sizeof(LosFilePage));
|
|
|
|
|
if (fpage == NULL) {
|
|
|
|
|
LOS_PhysPageFree(vmPage);
|
|
|
|
|
=======
|
|
|
|
|
fpage = (LosFilePage *)LOS_MemAlloc(m_aucSysMem0, sizeof(LosFilePage));//从内存池中分配一个filePage
|
|
|
|
|
if (fpage == NULL) {
|
|
|
|
|
LOS_PhysPageFree(vmPage); //异常情况要释放vmPage
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
VM_ERR("Failed to allocate for page!");
|
|
|
|
|
return NULL;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
(VOID)memset_s((VOID *)fpage, sizeof(LosFilePage), 0, sizeof(LosFilePage));
|
|
|
|
|
|
|
|
|
|
LOS_ListInit(&fpage->i_mmap);
|
|
|
|
|
@ -596,6 +950,21 @@ LosFilePage *OsPageCacheAlloc(struct page_mapping *mapping, VM_OFFSET_T pgoff)
|
|
|
|
|
fpage->mapping = mapping;
|
|
|
|
|
fpage->pgoff = pgoff;
|
|
|
|
|
(VOID)memset_s(kvaddr, PAGE_SIZE, 0, PAGE_SIZE);
|
|
|
|
|
=======
|
|
|
|
|
(VOID)memset_s((VOID *)fpage, sizeof(LosFilePage), 0, sizeof(LosFilePage));//调标准库函数 置0
|
|
|
|
|
|
|
|
|
|
LOS_ListInit(&fpage->i_mmap); //初始化映射,链表上挂 MapInfo
|
|
|
|
|
LOS_ListInit(&fpage->node); //节点初始化
|
|
|
|
|
LOS_ListInit(&fpage->lru); //LRU初始化
|
|
|
|
|
fpage->n_maps = 0; //映射次数
|
|
|
|
|
fpage->dirtyOff = PAGE_SIZE; //默认页尾部,相当于没有脏数据
|
|
|
|
|
fpage->dirtyEnd = 0; //脏页结束位置
|
|
|
|
|
fpage->physSeg = physSeg; //页框所属段.其中包含了 LRU LIST ==
|
|
|
|
|
fpage->vmPage = vmPage; //物理页框
|
|
|
|
|
fpage->mapping = mapping; //记录所有文件页映射
|
|
|
|
|
fpage->pgoff = pgoff; //将文件切成一页页，页标
|
|
|
|
|
(VOID)memset_s(kvaddr, PAGE_SIZE, 0, PAGE_SIZE);//页内数据清0
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
|
|
|
|
|
return fpage;
|
|
|
|
|
}
|
|
|
|
|
@ -609,4 +978,8 @@ INT32 OsVfsFileMmap(struct file *filep, LosVmMapRegion *region)
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
<<<<<<< HEAD
|
|
|
|
|
#endif
|
|
|
|
|
=======
|
|
|
|
|
#endif
|
|
|
|
|
>>>>>>> remotes/origin/main
|
|
|
|
|
|
