include/linux/mm

struct mm_strucalso t

`____cacheline_aligned_in_smp`
`mm_mt`	`struct maple_tree`
`get_unmapped_area`	function pointer	requires `CONFIG_MMU`
`mmap_base`	`unsigned long`	base of mmap area
`mmap_legacy_base`	`unsigned long`	base of mmap area in bottom-up allocations
`mmap_compat_base`	`unsigned long`	Base addresss for compatible `mmap()`. Requires `CONFIG_HAVE_ARCH_COMPAT_MMAP_BASES`
`mmap_compat_legacy_base`	`unsigned long`	Base addresss for compatible `mmap()`. Requires `CONFIG_HAVE_ARCH_COMPAT_MMAP_BASES`
`task_size`	`unsigned long`	Size of task vm space
`pgd`	`pgd_t*`
`membarrier_state`	`atomic_t`	Flags controlling membarrier behavior. This field is close to `pgd` to hopefully fit in the same cache-line, which needs to be touched by `switch_mm()`.
`mm_users`	`atomic_t`	Number of users (including userspace). Memory can be freed if value goes to `0`. Value is modified with `mmget()`, `mmget_not_zero()` and `mmput()`.
`pcpu_cid``	`struct mm_cid*`	Per-cpu current cid. Requires `CONFIG_SCHED_MM_CID`
`mm_cid_next_scan``	`unsigned long`	Per-cpu current cid. Requires `CONFIG_SCHED_MM_CID`
`pgtables_bytes`	`atomic_long_t`	Size of all page tables. Requires `CONFIG_MMU`.
`map_count`	`int`	Number of VMAs.
`page_table_lock`	`spinlock_t`	Protection for page tables and some counters.
`mmap_lock`	`struct rw_semaphore`
`mmlist`	`struct list_head`	List of maybe swapped mm's.
`mm_lock_seq`	`int`	Requires `CONFIG_PER_VMA_LOCK`
`hiwater_rss`	`unsigned long`	High-watermark of RSS usage
`hiwater_vm`	`unsigned long`	High-water virtual memory usage
`total_vm`	`unsigned long`	Total pages mapped
`locked_vm`	`unsiged long`	Pages that have PG_mlocked set
`pinned_vm`	`atomic_t`	Refcount permanently increased
`data_vm`	`unsigned long`	`VM_WRITE & ~VM_SHARED & ~VM_STACK`
`exec_vm`	`unsigned long`	`VM_EXEC & ~VM_WRITE & ~VM_STACK`
`stack_vm`	`unsigned long`	`VM_STACK`
`def_flags``	`unsigned long`
`seqcount_t`	`write_protect_seq`	Locked when any thread is write protecting pages mapped by this mm to enforce a later COW, for instance during page table copying for `fork()`.
`arg_lock`	`spinlock_t`	Protect the fields below (`start_code`, `end_code` through `env_end`?)
`start_code`	`unsigned long`
`end_code`	`unsigned long`
`start_data`	`unsigned long`
`end_data`	`unsigned long`
`start_brk`	`unsigned long`
`brk`	`unsigned long`
`start_stack`	`unsigned long`
`start`	`unsigned long`
`arg_end`	`unsigned long`
`env_start`	`unsigned long`
`env_end`	`unsigned long`
`saved_auxv`	`unsigned long[AT_VECTOR_SIZE]`	For `/proc/$pid/auxv`.
`rss_stat`	`struct percpu_counter[NR_MM_COUNTERS]`
`binfmt`	`struct linux_binfmt*`
`context``	`mm_context_t`	Architecture-specific context
`flags`	`unsigned long`
`ioctx_lock`	`spinlock_t`	Requires `CONFIG_AIO`
`ioctx_table`	`struct kioctx_table*`	Requires `CONFIG_AIO`
`owner`	`struct task_struct*`	Points to a task that is regarded as the «canonical» user/owner of this struct. Requires `CONFIG_MEMCG`
`user_ns`	`struct user_namespace*`
`exe`	`struct file*`	Reference to `/proc/$pid/exe`.
`notifier_subscriptions`	`struct mmu_notifier_subscriptions*`	Requires `CONFIG_MMU_NOTIFIER`
`pmd_huge_pte`	`pgtable_t`	Requires `CONFIG_TRANSPARENT_HUGEPAGE` to be defined and `USE_SPLIT_PMD_PTLOCKS` to be not defined.
`numa_next_scan`	`unsigned long`	is the next time that PTEs will be remapped. Requires `CONFIG_NUMA_BALANCING`
`numa_scan_offset`	`unsigned long`	Restart point for scanning and remapping PTEs. Requires `CONFIG_NUMA_BALANCING`
`numa_scan_seq`	`int`	prevent two threads remapping PTEs. Requires `CONFIG_NUMA_BALANCING`
`tlb_flush_pending`	`atomic_t`	Flag indicateing thab batched TLB flushing is going on?
`tlb_flush_batched`	`atomic_t`	See `flush_tlb_batched_pending()`. Requires `CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH`
`uprobes_state`	`struct uprobes_state`
`delayed_drop`	`struct rcu_head`	Requires `CONFIG_PREEMPT_RT`
`hugetlb_usage`	`atomic_long_t`	Requires `CONFIG_HUGETLB_PAGE`
`async_put_work`	`struct work_struct`
`pasid`	`u32`	Requires `CONFIG_IOMMU_SVA`
`ksm_mering_pages`	`unsigned long`	Number of pages of this process are involved in KSM merging. Requires `CONFIG_KSM`
`ksm_rmap_items`	`unsigned long`	Number of pages that are checked for KSM merging, including merged and not merged. Requires `CONFIG_KSM`
`lru_gen`	A «sub struct» ?	Requires `CONFIG_LRU_GEN`
`lru_gen.memcg`	`struct mem_cgroup`	Requires `CONFIG_MEMCG`

extern struct mm_struct init_mm;

The fields mm and active_mm in task_struct are pointers to struct mm_struct.

include/linux/mm_types.h

struct mm_strucalso t