[patch 4/5] move mm_struct and vm_area_struct.

Martin Schwidefsky
2007-06-29T14:15:41Z

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From: Martin Schwidefsky <schwidefsky@de.ibm.com>

Move the definitions of struct mm_struct and struct vma_area_struct
to include/mm_types.h. This allows to define more function in
asm/pgtable.h and friends with inline assemblies instead of macros.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

include/linux/mm.h | 63 --------------------
include/linux/mm_types.h | 143 +++++++++++++++++++++++++++++++++++++++++++++++
include/linux/sched.h | 74 ------------------------
3 files changed, 144 insertions(+), 136 deletions(-)

diff -urpN linux-2.6/include/linux/mm.h linux-2.6-patched/include/linux/mm.h
--- linux-2.6/include/linux/mm.h 2007-06-29 15:44:08.000000000 +0200
+++ linux-2.6-patched/include/linux/mm.h 2007-06-29 15:44:12.000000000 +0200
@@ -51,69 +51,6 @@ extern int sysctl_legacy_va_layout;
* mmap() functions).
*/

-/*
- * This struct defines a memory VMM memory area. There is one of these
- * per VM-area/task. A VM area is any part of the process virtual memory
- * space that has a special rule for the page-fault handlers (ie a shared
- * library, the executable area etc).
- */
-struct vm_area_struct {
- struct mm_struct * vm_mm; /* The address space we belong to. */
- unsigned long vm_start; /* Our start address within vm_mm. */
- unsigned long vm_end; /* The first byte after our end address
- within vm_mm. */
-
- /* linked list of VM areas per task, sorted by address */
- struct vm_area_struct *vm_next;
-
- pgprot_t vm_page_prot; /* Access permissions of this VMA. */
- unsigned long vm_flags; /* Flags, listed below. */
-
- struct rb_node vm_rb;
-
- /*
- * For areas with an address space and backing store,
- * linkage into the address_space->i_mmap prio tree, or
- * linkage to the list of like vmas hanging off its node, or
- * linkage of vma in the address_space->i_mmap_nonlinear list.
- */
- union {
- struct {
- struct list_head list;
- void *parent; /* aligns with prio_tree_node parent */
- struct vm_area_struct *head;
- } vm_set;
-
- struct raw_prio_tree_node prio_tree_node;
- } shared;
-
- /*
- * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma
- * list, after a COW of one of the file pages. A MAP_SHARED vma
- * can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack
- * or brk vma (with NULL file) can only be in an anon_vma list.
- */
- struct list_head anon_vma_node; /* Serialized by anon_vma->lock */
- struct anon_vma *anon_vma; /* Serialized by page_table_lock */
-
- /* Function pointers to deal with this struct. */
- struct vm_operations_struct * vm_ops;
-
- /* Information about our backing store: */
- unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE
- units, *not* PAGE_CACHE_SIZE */
- struct file * vm_file; /* File we map to (can be NULL). */
- void * vm_private_data; /* was vm_pte (shared mem) */
- unsigned long vm_truncate_count;/* truncate_count or restart_addr */
-
-#ifndef CONFIG_MMU
- atomic_t vm_usage; /* refcount (VMAs shared if !MMU) */
-#endif
-#ifdef CONFIG_NUMA
- struct mempolicy *vm_policy; /* NUMA policy for the VMA */
-#endif
-};
-
extern struct kmem_cache *vm_area_cachep;

/*
diff -urpN linux-2.6/include/linux/mm_types.h linux-2.6-patched/include/linux/mm_types.h
--- linux-2.6/include/linux/mm_types.h 2007-05-11 09:19:04.000000000 +0200
+++ linux-2.6-patched/include/linux/mm_types.h 2007-06-29 15:44:12.000000000 +0200
@@ -1,13 +1,25 @@
#ifndef _LINUX_MM_TYPES_H
#define _LINUX_MM_TYPES_H

+#include <linux/auxvec.h> /* For AT_VECTOR_SIZE */
#include <linux/types.h>
#include <linux/threads.h>
#include <linux/list.h>
#include <linux/spinlock.h>
+#include <linux/prio_tree.h>
+#include <linux/rbtree.h>
+#include <linux/rwsem.h>
+#include <linux/completion.h>
+#include <asm/mmu.h>

struct address_space;

+#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
+typedef atomic_long_t mm_counter_t;
+#else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
+typedef unsigned long mm_counter_t;
+#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
+
/*
* Each physical page in the system has a struct page associated with
* it to keep track of whatever it is we are using the page for at the
@@ -80,4 +92,135 @@ struct page {
#endif /* WANT_PAGE_VIRTUAL */
};

+/*
+ * This struct defines a memory VMM memory area. There is one of these
+ * per VM-area/task. A VM area is any part of the process virtual memory
+ * space that has a special rule for the page-fault handlers (ie a shared
+ * library, the executable area etc).
+ */
+struct vm_area_struct {
+ struct mm_struct * vm_mm; /* The address space we belong to. */
+ unsigned long vm_start; /* Our start address within vm_mm. */
+ unsigned long vm_end; /* The first byte after our end address
+ within vm_mm. */
+
+ /* linked list of VM areas per task, sorted by address */
+ struct vm_area_struct *vm_next;
+
+ pgprot_t vm_page_prot; /* Access permissions of this VMA. */
+ unsigned long vm_flags; /* Flags, listed below. */
+
+ struct rb_node vm_rb;
+
+ /*
+ * For areas with an address space and backing store,
+ * linkage into the address_space->i_mmap prio tree, or
+ * linkage to the list of like vmas hanging off its node, or
+ * linkage of vma in the address_space->i_mmap_nonlinear list.
+ */
+ union {
+ struct {
+ struct list_head list;
+ void *parent; /* aligns with prio_tree_node parent */
+ struct vm_area_struct *head;
+ } vm_set;
+
+ struct raw_prio_tree_node prio_tree_node;
+ } shared;
+
+ /*
+ * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma
+ * list, after a COW of one of the file pages. A MAP_SHARED vma
+ * can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack
+ * or brk vma (with NULL file) can only be in an anon_vma list.
+ */
+ struct list_head anon_vma_node; /* Serialized by anon_vma->lock */
+ struct anon_vma *anon_vma; /* Serialized by page_table_lock */
+
+ /* Function pointers to deal with this struct. */
+ struct vm_operations_struct * vm_ops;
+
+ /* Information about our backing store: */
+ unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE
+ units, *not* PAGE_CACHE_SIZE */
+ struct file * vm_file; /* File we map to (can be NULL). */
+ void * vm_private_data; /* was vm_pte (shared mem) */
+ unsigned long vm_truncate_count;/* truncate_count or restart_addr */
+
+#ifndef CONFIG_MMU
+ atomic_t vm_usage; /* refcount (VMAs shared if !MMU) */
+#endif
+#ifdef CONFIG_NUMA
+ struct mempolicy *vm_policy; /* NUMA policy for the VMA */
+#endif
+};
+
+struct mm_struct {
+ struct vm_area_struct * mmap; /* list of VMAs */
+ struct rb_root mm_rb;
+ struct vm_area_struct * mmap_cache; /* last find_vma result */
+ unsigned long (*get_unmapped_area) (struct file *filp,
+ unsigned long addr, unsigned long len,
+ unsigned long pgoff, unsigned long flags);
+ void (*unmap_area) (struct mm_struct *mm, unsigned long addr);
+ unsigned long mmap_base; /* base of mmap area */
+ unsigned long task_size; /* size of task vm space */
+ unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */
+ unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */
+ pgd_t * pgd;
+ atomic_t mm_users; /* How many users with user space? */
+ atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
+ int map_count; /* number of VMAs */
+ struct rw_semaphore mmap_sem;
+ spinlock_t page_table_lock; /* Protects page tables and some counters */
+
+ struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung
+ * together off init_mm.mmlist, and are protected
+ * by mmlist_lock
+ */
+
+ /* Special counters, in some configurations protected by the
+ * page_table_lock, in other configurations by being atomic.
+ */
+ mm_counter_t _file_rss;
+ mm_counter_t _anon_rss;
+
+ unsigned long hiwater_rss; /* High-watermark of RSS usage */
+ unsigned long hiwater_vm; /* High-water virtual memory usage */
+
+ unsigned long total_vm, locked_vm, shared_vm, exec_vm;
+ unsigned long stack_vm, reserved_vm, def_flags, nr_ptes;
+ unsigned long start_code, end_code, start_data, end_data;
+ unsigned long start_brk, brk, start_stack;
+ unsigned long arg_start, arg_end, env_start, env_end;
+
+ unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */
+
+ cpumask_t cpu_vm_mask;
+
+ /* Architecture-specific MM context */
+ mm_context_t context;
+
+ /* Swap token stuff */
+ /*
+ * Last value of global fault stamp as seen by this process.
+ * In other words, this value gives an indication of how long
+ * it has been since this task got the token.
+ * Look at mm/thrash.c
+ */
+ unsigned int faultstamp;
+ unsigned int token_priority;
+ unsigned int last_interval;
+
+ unsigned char dumpable:2;
+
+ /* coredumping support */
+ int core_waiters;
+ struct completion *core_startup_done, core_done;
+
+ /* aio bits */
+ rwlock_t ioctx_list_lock;
+ struct kioctx *ioctx_list;
+};
+
#endif /* _LINUX_MM_TYPES_H */
diff -urpN linux-2.6/include/linux/sched.h linux-2.6-patched/include/linux/sched.h
--- linux-2.6/include/linux/sched.h 2007-06-09 12:24:04.000000000 +0200
+++ linux-2.6-patched/include/linux/sched.h 2007-06-29 15:44:12.000000000 +0200
@@ -1,8 +1,6 @@
#ifndef _LINUX_SCHED_H
#define _LINUX_SCHED_H

-#include <linux/auxvec.h> /* For AT_VECTOR_SIZE */
-
/*
* cloning flags:
*/
@@ -54,12 +52,12 @@ struct sched_param {
#include <linux/cpumask.h>
#include <linux/errno.h>
#include <linux/nodemask.h>
+#include <linux/mm_types.h>

#include <asm/system.h>
#include <asm/semaphore.h>
#include <asm/page.h>
#include <asm/ptrace.h>
-#include <asm/mmu.h>
#include <asm/cputime.h>

#include <linux/smp.h>
@@ -292,7 +290,6 @@ extern void arch_unmap_area_topdown(stru
#define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
-typedef atomic_long_t mm_counter_t;

#else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
/*
@@ -304,7 +301,6 @@ typedef atomic_long_t mm_counter_t;
#define add_mm_counter(mm, member, value) (mm)->_##member += (value)
#define inc_mm_counter(mm, member) (mm)->_##member++
#define dec_mm_counter(mm, member) (mm)->_##member--
-typedef unsigned long mm_counter_t;

#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */

@@ -320,74 +316,6 @@ typedef unsigned long mm_counter_t;
(mm)->hiwater_vm = (mm)->total_vm; \
} while (0)

-struct mm_struct {
- struct vm_area_struct * mmap; /* list of VMAs */
- struct rb_root mm_rb;
- struct vm_area_struct * mmap_cache; /* last find_vma result */
- unsigned long (*get_unmapped_area) (struct file *filp,
- unsigned long addr, unsigned long len,
- unsigned long pgoff, unsigned long flags);
- void (*unmap_area) (struct mm_struct *mm, unsigned long addr);
- unsigned long mmap_base; /* base of mmap area */
- unsigned long task_size; /* size of task vm space */
- unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */
- unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */
- pgd_t * pgd;
- atomic_t mm_users; /* How many users with user space? */
- atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
- int map_count; /* number of VMAs */
- struct rw_semaphore mmap_sem;
- spinlock_t page_table_lock; /* Protects page tables and some counters */
-
- struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung
- * together off init_mm.mmlist, and are protected
- * by mmlist_lock
- */
-
- /* Special counters, in some configurations protected by the
- * page_table_lock, in other configurations by being atomic.
- */
- mm_counter_t _file_rss;
- mm_counter_t _anon_rss;
-
- unsigned long hiwater_rss; /* High-watermark of RSS usage */
- unsigned long hiwater_vm; /* High-water virtual memory usage */
-
- unsigned long total_vm, locked_vm, shared_vm, exec_vm;
- unsigned long stack_vm, reserved_vm, def_flags, nr_ptes;
- unsigned long start_code, end_code, start_data, end_data;
- unsigned long start_brk, brk, start_stack;
- unsigned long arg_start, arg_end, env_start, env_end;
-
- unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */
-
- cpumask_t cpu_vm_mask;
-
- /* Architecture-specific MM context */
- mm_context_t context;
-
- /* Swap token stuff */
- /*
- * Last value of global fault stamp as seen by this process.
- * In other words, this value gives an indication of how long
- * it has been since this task got the token.
- * Look at mm/thrash.c
- */
- unsigned int faultstamp;
- unsigned int token_priority;
- unsigned int last_interval;
-
- unsigned char dumpable:2;
-
- /* coredumping support */
- int core_waiters;
- struct completion *core_startup_done, core_done;
-
- /* aio bits */
- rwlock_t ioctx_list_lock;
- struct kioctx *ioctx_list;
-};
-
struct sighand_struct {
atomic_t count;
struct k_sigaction action[_NSIG];