struct anon_vma *anon_vma, struct file *file, pgoff_t pgoff, struct mempolicy *policy, struct vm_userfaultfd_ctx vm_userfaultfd_ctx) { pgoff_t pglen = (end - addr) >> PAGE_SHIFT; struct vm_area_struct *area, *next; int err; /* * We later require that vma->vm_flags == vm...
pgoff_t index,映射虚拟内存空间里的地址偏移,一个文件可能只映射其中的一部分,假设映射了 1M 的空间,index 指的是在 1M 空间内的偏移,而不是在整个文件内的偏移 unsigned long private,私有数据指针 atomic_t _mapcount,该 page 被页表映射的次数,即这个 page 被多少个进程共享,初始值为-1(非伙伴系统,如果...
管理页帧相关的VMA的映射关系struct rb_root_cached i_mmap;struct rw_semaphore i_mmap_rwsem;// page的个数unsigned long nrpages;unsigned long nrexceptional;pgoff_t writeback_index;// address_space的操作操作函数,每个磁盘
pgoff_t index;/*Our offset within mapping.*//** * @private: Mapping-private opaque data. * Usually used for buffer_heads if PagePrivate. * Used for swp_entry_t if PageSwapCache. * Indicates order in the buddy system if PageBuddy.*/unsignedlongprivate; };...#ifdefined(WANT_PAGE_VIRT...
pgoff_t index; union {void*private; swp_entry_t swap; }; atomic_t _mapcount; atomic_t _refcount; #ifdef CONFIG_MEMCG unsignedlongmemcg_data;#endif#ifdefined(WANT_PAGE_VIRTUAL)void*virtual;#endif#ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGSint_last_cpupid;#endif/*private: the union with struct...
void__inite820__memblock_setup(void){int i;u64 end;memblock_allow_resize();for(i=0;i<e820_table->nr_entries;i++){struct e820_entry*entry=&e820_table->entries[i];end=entry->addr+entry->size;if(end!=(resource_size_t)end)continue;if(entry->type==E820_TYPE_SOFT_RESERVED)memblock_...
mm/mmap.c struct vm_area_struct *vma_merge(struct mm_struct *mm, struct vm_area_struct *prev, unsigned long addr, unsigned long end, unsigned long vm_flags, struct anon_vma *anon_vma, struct file *file, pgoff_t pgoff, struct mempolicy *policy) { pgoff_t pglen = (end -addr) >>...
*/};struct kmem_cache*slab;/* SLUB: Pointer to slab */struct page*first_page;/* Compound tail pages */};union{pgoff_t index;/* Our offset within mapping. */void*freelist;/* SLUB: freelist req. slab lock */};struct list_head lru;/* Pageout list, eg. active_list ...
pgoff_t offset) { return pagecache_get_page(mapping, offset, 0, 0); } 由于共享匿名映射并没有对文件映射,所以其他进程想要在内存中查找要进行共享的内存页就非常困难了,那怎么解决这个问题呢 ? 既然共享文件映射可以轻松解决这个问题,那我们何不借鉴一下文件映射的方式 ?
mremap06 reproducer for7e7757876f25 ("mm/mremap: fix vm_pgoff in vma_merge() case 3") starvation a simple test case for sched starvationhttps://lwn.net/ml/linux-kernel/9fd2c37a05713c206dcbd5866f67ce779f315e9e.camel@gmx.de/ pipe14 for end-of-file (read() returns 0) in a case th...