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Subject[PATCH] NUMA API for Linux 5/ Add VMA hooks for policy

NUMA API adds a policy to each VMA. During VMA creattion, merging and
splitting these policies must be handled properly. This patch adds
the calls to this.

It is a nop when CONFIG_NUMA is not defined.

diff -u linux-2.6.5-numa/arch/ia64/ia32/binfmt_elf32.c-o linux-2.6.5-numa/arch/ia64/ia32/binfmt_elf32.c
--- linux-2.6.5-numa/arch/ia64/ia32/binfmt_elf32.c-o 1970-01-01 01:12:51.000000000 +0100
+++ linux-2.6.5-numa/arch/ia64/ia32/binfmt_elf32.c 2004-04-06 13:36:12.000000000 +0200
@@ -104,6 +104,7 @@
vma->vm_pgoff = 0;
vma->vm_file = NULL;
vma->vm_private_data = NULL;
+ mpol_set_vma_default(vma);
down_write(&current->mm->mmap_sem);
{
insert_vm_struct(current->mm, vma);
@@ -184,6 +185,7 @@
mpnt->vm_pgoff = 0;
mpnt->vm_file = NULL;
mpnt->vm_private_data = 0;
+ mpol_set_vma_default(mpnt);
insert_vm_struct(current->mm, mpnt);
current->mm->total_vm = (mpnt->vm_end - mpnt->vm_start) >> PAGE_SHIFT;
}
diff -u linux-2.6.5-numa/arch/ia64/kernel/perfmon.c-o linux-2.6.5-numa/arch/ia64/kernel/perfmon.c
--- linux-2.6.5-numa/arch/ia64/kernel/perfmon.c-o 1970-01-01 01:12:51.000000000 +0100
+++ linux-2.6.5-numa/arch/ia64/kernel/perfmon.c 2004-04-06 13:36:12.000000000 +0200
@@ -2273,6 +2273,7 @@
vma->vm_ops = &pfm_vm_ops;
vma->vm_pgoff = 0;
vma->vm_file = NULL;
+ mpol_set_vma_default(vma);
vma->vm_private_data = ctx; /* information needed by the pfm_vm_close() function */

/*
diff -u linux-2.6.5-numa/arch/ia64/mm/init.c-o linux-2.6.5-numa/arch/ia64/mm/init.c
--- linux-2.6.5-numa/arch/ia64/mm/init.c-o 2004-04-06 13:12:00.000000000 +0200
+++ linux-2.6.5-numa/arch/ia64/mm/init.c 2004-04-06 13:36:12.000000000 +0200
@@ -131,6 +131,7 @@
vma->vm_pgoff = 0;
vma->vm_file = NULL;
vma->vm_private_data = NULL;
+ mpol_set_vma_default(vma);
insert_vm_struct(current->mm, vma);
}

@@ -143,6 +144,7 @@
vma->vm_end = PAGE_SIZE;
vma->vm_page_prot = __pgprot(pgprot_val(PAGE_READONLY) | _PAGE_MA_NAT);
vma->vm_flags = VM_READ | VM_MAYREAD | VM_IO | VM_RESERVED;
+ mpol_set_vma_default(vma);
insert_vm_struct(current->mm, vma);
}
}
diff -u linux-2.6.5-numa/arch/m68k/atari/stram.c-o linux-2.6.5-numa/arch/m68k/atari/stram.c
--- linux-2.6.5-numa/arch/m68k/atari/stram.c-o 2004-03-21 21:12:07.000000000 +0100
+++ linux-2.6.5-numa/arch/m68k/atari/stram.c 2004-04-06 13:36:12.000000000 +0200
@@ -752,7 +752,7 @@
/* Get a page for the entry, using the existing
swap cache page if there is one. Otherwise,
get a clean page and read the swap into it. */
- page = read_swap_cache_async(entry);
+ page = read_swap_cache_async(entry, NULL, 0);
if (!page) {
swap_free(entry);
return -ENOMEM;
diff -u linux-2.6.5-numa/arch/s390/kernel/compat_exec.c-o linux-2.6.5-numa/arch/s390/kernel/compat_exec.c
--- linux-2.6.5-numa/arch/s390/kernel/compat_exec.c-o 2004-03-21 21:12:11.000000000 +0100
+++ linux-2.6.5-numa/arch/s390/kernel/compat_exec.c 2004-04-06 13:36:12.000000000 +0200
@@ -71,6 +71,7 @@
mpnt->vm_ops = NULL;
mpnt->vm_pgoff = 0;
mpnt->vm_file = NULL;
+ mpol_set_vma_default(mpnt);
INIT_LIST_HEAD(&mpnt->shared);
mpnt->vm_private_data = (void *) 0;
insert_vm_struct(mm, mpnt);
diff -u linux-2.6.5-numa/arch/x86_64/ia32/ia32_binfmt.c-o linux-2.6.5-numa/arch/x86_64/ia32/ia32_binfmt.c
--- linux-2.6.5-numa/arch/x86_64/ia32/ia32_binfmt.c-o 2004-04-06 13:12:04.000000000 +0200
+++ linux-2.6.5-numa/arch/x86_64/ia32/ia32_binfmt.c 2004-04-06 13:36:12.000000000 +0200
@@ -360,6 +360,7 @@
mpnt->vm_ops = NULL;
mpnt->vm_pgoff = 0;
mpnt->vm_file = NULL;
+ mpol_set_vma_default(mpnt);
INIT_LIST_HEAD(&mpnt->shared);
mpnt->vm_private_data = (void *) 0;
insert_vm_struct(mm, mpnt);
diff -u linux-2.6.5-numa/fs/exec.c-o linux-2.6.5-numa/fs/exec.c
--- linux-2.6.5-numa/fs/exec.c-o 1970-01-01 01:12:51.000000000 +0100
+++ linux-2.6.5-numa/fs/exec.c 2004-04-06 13:36:12.000000000 +0200
@@ -430,6 +430,7 @@
mpnt->vm_ops = NULL;
mpnt->vm_pgoff = 0;
mpnt->vm_file = NULL;
+ mpol_set_vma_default(mpnt);
INIT_LIST_HEAD(&mpnt->shared);
mpnt->vm_private_data = (void *) 0;
insert_vm_struct(mm, mpnt);
diff -u linux-2.6.5-numa/kernel/exit.c-o linux-2.6.5-numa/kernel/exit.c
--- linux-2.6.5-numa/kernel/exit.c-o 2004-04-06 13:12:24.000000000 +0200
+++ linux-2.6.5-numa/kernel/exit.c 2004-04-06 13:36:12.000000000 +0200
@@ -779,6 +779,7 @@
exit_namespace(tsk);
exit_itimers(tsk);
exit_thread();
+ mpol_free(tsk->mempolicy);

if (tsk->leader)
disassociate_ctty(1);
diff -u linux-2.6.5-numa/kernel/fork.c-o linux-2.6.5-numa/kernel/fork.c
--- linux-2.6.5-numa/kernel/fork.c-o 1970-01-01 01:12:51.000000000 +0100
+++ linux-2.6.5-numa/kernel/fork.c 2004-04-06 13:36:12.000000000 +0200
@@ -268,6 +268,7 @@
struct rb_node **rb_link, *rb_parent;
int retval;
unsigned long charge = 0;
+ struct mempolicy *pol;

down_write(&oldmm->mmap_sem);
flush_cache_mm(current->mm);
@@ -309,6 +310,11 @@
if (!tmp)
goto fail_nomem;
*tmp = *mpnt;
+ pol = mpol_copy(vma_policy(mpnt));
+ retval = PTR_ERR(pol);
+ if (IS_ERR(pol))
+ goto fail_nomem_policy;
+ vma_set_policy(tmp, pol);
tmp->vm_flags &= ~VM_LOCKED;
tmp->vm_mm = mm;
tmp->vm_next = NULL;
@@ -355,6 +361,8 @@
flush_tlb_mm(current->mm);
up_write(&oldmm->mmap_sem);
return retval;
+fail_nomem_policy:
+ kmem_cache_free(vm_area_cachep, tmp);
fail_nomem:
retval = -ENOMEM;
fail:
@@ -946,9 +954,16 @@
p->security = NULL;
p->io_context = NULL;

+ p->mempolicy = mpol_copy(p->mempolicy);
+ if (IS_ERR(p->mempolicy)) {
+ retval = PTR_ERR(p->mempolicy);
+ p->mempolicy = NULL;
+ goto bad_fork_cleanup;
+ }
+
retval = -ENOMEM;
if ((retval = security_task_alloc(p)))
- goto bad_fork_cleanup;
+ goto bad_fork_cleanup_policy;
/* copy all the process information */
if ((retval = copy_semundo(clone_flags, p)))
goto bad_fork_cleanup_security;
@@ -1088,6 +1103,8 @@
exit_sem(p);
bad_fork_cleanup_security:
security_task_free(p);
+bad_fork_cleanup_policy:
+ mpol_free(p->mempolicy);
bad_fork_cleanup:
if (p->pid > 0)
free_pidmap(p->pid);
diff -u linux-2.6.5-numa/mm/mmap.c-o linux-2.6.5-numa/mm/mmap.c
--- linux-2.6.5-numa/mm/mmap.c-o 2004-04-06 13:12:24.000000000 +0200
+++ linux-2.6.5-numa/mm/mmap.c 2004-04-06 13:36:12.000000000 +0200
@@ -388,7 +388,8 @@
static int vma_merge(struct mm_struct *mm, struct vm_area_struct *prev,
struct rb_node *rb_parent, unsigned long addr,
unsigned long end, unsigned long vm_flags,
- struct file *file, unsigned long pgoff)
+ struct file *file, unsigned long pgoff,
+ struct mempolicy *policy)
{
spinlock_t *lock = &mm->page_table_lock;
struct inode *inode = file ? file->f_dentry->d_inode : NULL;
@@ -412,6 +413,7 @@
* Can it merge with the predecessor?
*/
if (prev->vm_end == addr &&
+ mpol_equal(vma_policy(prev), policy) &&
is_mergeable_vma(prev, file, vm_flags) &&
can_vma_merge_after(prev, vm_flags, file, pgoff)) {
struct vm_area_struct *next;
@@ -430,6 +432,7 @@
*/
next = prev->vm_next;
if (next && prev->vm_end == next->vm_start &&
+ vma_mpol_equal(prev, next) &&
can_vma_merge_before(next, vm_flags, file,
pgoff, (end - addr) >> PAGE_SHIFT)) {
prev->vm_end = next->vm_end;
@@ -442,6 +445,7 @@
fput(file);

mm->map_count--;
+ mpol_free(vma_policy(next));
kmem_cache_free(vm_area_cachep, next);
return 1;
}
@@ -457,6 +461,8 @@
prev = prev->vm_next;
if (prev) {
merge_next:
+ if (!mpol_equal(policy, vma_policy(prev)))
+ return 0;
if (!can_vma_merge_before(prev, vm_flags, file,
pgoff, (end - addr) >> PAGE_SHIFT))
return 0;
@@ -633,7 +639,7 @@
/* Can we just expand an old anonymous mapping? */
if (!file && !(vm_flags & VM_SHARED) && rb_parent)
if (vma_merge(mm, prev, rb_parent, addr, addr + len,
- vm_flags, NULL, 0))
+ vm_flags, NULL, pgoff, NULL))
goto out;

/*
@@ -656,6 +662,7 @@
vma->vm_file = NULL;
vma->vm_private_data = NULL;
vma->vm_next = NULL;
+ mpol_set_vma_default(vma);
INIT_LIST_HEAD(&vma->shared);

if (file) {
@@ -695,7 +702,9 @@
addr = vma->vm_start;

if (!file || !rb_parent || !vma_merge(mm, prev, rb_parent, addr,
- addr + len, vma->vm_flags, file, pgoff)) {
+ vma->vm_end,
+ vma->vm_flags, file, pgoff,
+ vma_policy(vma))) {
vma_link(mm, vma, prev, rb_link, rb_parent);
if (correct_wcount)
atomic_inc(&inode->i_writecount);
@@ -705,6 +714,7 @@
atomic_inc(&inode->i_writecount);
fput(file);
}
+ mpol_free(vma_policy(vma));
kmem_cache_free(vm_area_cachep, vma);
}
out:
@@ -1120,6 +1130,7 @@

remove_shared_vm_struct(area);

+ mpol_free(vma_policy(area));
if (area->vm_ops && area->vm_ops->close)
area->vm_ops->close(area);
if (area->vm_file)
@@ -1202,6 +1213,7 @@
int split_vma(struct mm_struct * mm, struct vm_area_struct * vma,
unsigned long addr, int new_below)
{
+ struct mempolicy *pol;
struct vm_area_struct *new;
struct address_space *mapping = NULL;

@@ -1224,6 +1236,13 @@
new->vm_pgoff += ((addr - vma->vm_start) >> PAGE_SHIFT);
}

+ pol = mpol_copy(vma_policy(vma));
+ if (IS_ERR(pol)) {
+ kmem_cache_free(vm_area_cachep, new);
+ return PTR_ERR(pol);
+ }
+ vma_set_policy(new, pol);
+
if (new->vm_file)
get_file(new->vm_file);

@@ -1393,7 +1412,7 @@

/* Can we just expand an old anonymous mapping? */
if (rb_parent && vma_merge(mm, prev, rb_parent, addr, addr + len,
- flags, NULL, 0))
+ flags, NULL, 0, NULL))
goto out;

/*
@@ -1414,6 +1433,7 @@
vma->vm_pgoff = 0;
vma->vm_file = NULL;
vma->vm_private_data = NULL;
+ mpol_set_vma_default(vma);
INIT_LIST_HEAD(&vma->shared);

vma_link(mm, vma, prev, rb_link, rb_parent);
@@ -1474,6 +1494,7 @@
}
if (vma->vm_file)
fput(vma->vm_file);
+ mpol_free(vma_policy(vma));
kmem_cache_free(vm_area_cachep, vma);
vma = next;
}
diff -u linux-2.6.5-numa/mm/mprotect.c-o linux-2.6.5-numa/mm/mprotect.c
--- linux-2.6.5-numa/mm/mprotect.c-o 2004-04-06 13:12:24.000000000 +0200
+++ linux-2.6.5-numa/mm/mprotect.c 2004-04-06 13:36:12.000000000 +0200
@@ -124,6 +124,8 @@
return 0;
if (vma->vm_file || (vma->vm_flags & VM_SHARED))
return 0;
+ if (!vma_mpol_equal(vma, prev))
+ return 0;

/*
* If the whole area changes to the protection of the previous one
@@ -135,6 +137,7 @@
__vma_unlink(mm, vma, prev);
spin_unlock(&mm->page_table_lock);

+ mpol_free(vma_policy(vma));
kmem_cache_free(vm_area_cachep, vma);
mm->map_count--;
return 1;
@@ -317,12 +320,14 @@

if (next && prev->vm_end == next->vm_start &&
can_vma_merge(next, prev->vm_flags) &&
+ vma_mpol_equal(prev, next) &&
!prev->vm_file && !(prev->vm_flags & VM_SHARED)) {
spin_lock(&prev->vm_mm->page_table_lock);
prev->vm_end = next->vm_end;
__vma_unlink(prev->vm_mm, next, prev);
spin_unlock(&prev->vm_mm->page_table_lock);

+ mpol_free(vma_policy(next));
kmem_cache_free(vm_area_cachep, next);
prev->vm_mm->map_count--;
}
diff -u linux-2.6.5-numa/mm/mremap.c-o linux-2.6.5-numa/mm/mremap.c
--- linux-2.6.5-numa/mm/mremap.c-o 2004-03-21 21:12:13.000000000 +0100
+++ linux-2.6.5-numa/mm/mremap.c 2004-04-06 13:36:12.000000000 +0200
@@ -199,6 +199,7 @@
next = find_vma_prev(mm, new_addr, &prev);
if (next) {
if (prev && prev->vm_end == new_addr &&
+ mpol_equal(vma_policy(prev), vma_policy(next)) &&
can_vma_merge(prev, vma->vm_flags) && !vma->vm_file &&
!(vma->vm_flags & VM_SHARED)) {
spin_lock(&mm->page_table_lock);
@@ -208,6 +209,7 @@
if (next != prev->vm_next)
BUG();
if (prev->vm_end == next->vm_start &&
+ vma_mpol_equal(next, prev) &&
can_vma_merge(next, prev->vm_flags)) {
spin_lock(&mm->page_table_lock);
prev->vm_end = next->vm_end;
@@ -216,10 +218,12 @@
if (vma == next)
vma = prev;
mm->map_count--;
+ mpol_free(vma_policy(next));
kmem_cache_free(vm_area_cachep, next);
}
} else if (next->vm_start == new_addr + new_len &&
can_vma_merge(next, vma->vm_flags) &&
+ vma_mpol_equal(next, vma) &&
!vma->vm_file && !(vma->vm_flags & VM_SHARED)) {
spin_lock(&mm->page_table_lock);
next->vm_start = new_addr;
@@ -229,6 +233,7 @@
} else {
prev = find_vma(mm, new_addr-1);
if (prev && prev->vm_end == new_addr &&
+ vma_mpol_equal(prev, vma) &&
can_vma_merge(prev, vma->vm_flags) && !vma->vm_file &&
!(vma->vm_flags & VM_SHARED)) {
spin_lock(&mm->page_table_lock);
@@ -250,7 +255,12 @@
unsigned long vm_locked = vma->vm_flags & VM_LOCKED;

if (allocated_vma) {
+ struct mempolicy *pol;
*new_vma = *vma;
+ pol = mpol_copy(vma_policy(new_vma));
+ if (IS_ERR(pol))
+ goto out_vma;
+ vma_set_policy(new_vma, pol);
INIT_LIST_HEAD(&new_vma->shared);
new_vma->vm_start = new_addr;
new_vma->vm_end = new_addr+new_len;
@@ -291,6 +301,7 @@
}
return new_addr;
}
+ out_vma:
if (allocated_vma)
kmem_cache_free(vm_area_cachep, new_vma);
out:
-
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