mirror of
https://github.com/torvalds/linux.git
synced 2024-11-22 12:11:40 +00:00
[PATCH] Implement sys_* do_* layering in the memory policy layer.
- Do a separation between do_xxx and sys_xxx functions. sys_xxx functions take variable sized bitmaps from user space as arguments. do_xxx functions take fixed sized nodemask_t as arguments and may be used from inside the kernel. Doing so simplifies the initialization code. There is no fs = kernel_ds assumption anymore. - Split up get_nodes into get_nodes (which gets the node list) and contextualize_policy which restricts the nodes to those accessible to the task and updates cpusets. - Add comments explaining limitations of bind policy Signed-off-by: Christoph Lameter <clameter@sgi.com> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Lameter
Linus Torvalds
parent
bb7e7e032d
commit
8bccd85ffb
276
mm/mempolicy.c
276
mm/mempolicy.c
@ -2,6 +2,7 @@
|
||||
* Simple NUMA memory policy for the Linux kernel.
|
||||
*
|
||||
* Copyright 2003,2004 Andi Kleen, SuSE Labs.
|
||||
* (C) Copyright 2005 Christoph Lameter, Silicon Graphics, Inc.
|
||||
* Subject to the GNU Public License, version 2.
|
||||
*
|
||||
* NUMA policy allows the user to give hints in which node(s) memory should
|
||||
@ -17,13 +18,19 @@
|
||||
* offset into the backing object or offset into the mapping
|
||||
* for anonymous memory. For process policy an process counter
|
||||
* is used.
|
||||
*
|
||||
* bind Only allocate memory on a specific set of nodes,
|
||||
* no fallback.
|
||||
* FIXME: memory is allocated starting with the first node
|
||||
* to the last. It would be better if bind would truly restrict
|
||||
* the allocation to memory nodes instead
|
||||
*
|
||||
* preferred Try a specific node first before normal fallback.
|
||||
* As a special case node -1 here means do the allocation
|
||||
* on the local CPU. This is normally identical to default,
|
||||
* but useful to set in a VMA when you have a non default
|
||||
* process policy.
|
||||
*
|
||||
* default Allocate on the local node first, or when on a VMA
|
||||
* use the process policy. This is what Linux always did
|
||||
* in a NUMA aware kernel and still does by, ahem, default.
|
||||
@ -113,56 +120,6 @@ static int mpol_check_policy(int mode, nodemask_t *nodes)
|
||||
}
|
||||
return nodes_subset(*nodes, node_online_map) ? 0 : -EINVAL;
|
||||
}
|
||||
|
||||
/* Copy a node mask from user space. */
|
||||
static int get_nodes(nodemask_t *nodes, unsigned long __user *nmask,
|
||||
unsigned long maxnode, int mode)
|
||||
{
|
||||
unsigned long k;
|
||||
unsigned long nlongs;
|
||||
unsigned long endmask;
|
||||
|
||||
--maxnode;
|
||||
nodes_clear(*nodes);
|
||||
if (maxnode == 0 || !nmask)
|
||||
return 0;
|
||||
|
||||
nlongs = BITS_TO_LONGS(maxnode);
|
||||
if ((maxnode % BITS_PER_LONG) == 0)
|
||||
endmask = ~0UL;
|
||||
else
|
||||
endmask = (1UL << (maxnode % BITS_PER_LONG)) - 1;
|
||||
|
||||
/* When the user specified more nodes than supported just check
|
||||
if the non supported part is all zero. */
|
||||
if (nlongs > BITS_TO_LONGS(MAX_NUMNODES)) {
|
||||
if (nlongs > PAGE_SIZE/sizeof(long))
|
||||
return -EINVAL;
|
||||
for (k = BITS_TO_LONGS(MAX_NUMNODES); k < nlongs; k++) {
|
||||
unsigned long t;
|
||||
if (get_user(t, nmask + k))
|
||||
return -EFAULT;
|
||||
if (k == nlongs - 1) {
|
||||
if (t & endmask)
|
||||
return -EINVAL;
|
||||
} else if (t)
|
||||
return -EINVAL;
|
||||
}
|
||||
nlongs = BITS_TO_LONGS(MAX_NUMNODES);
|
||||
endmask = ~0UL;
|
||||
}
|
||||
|
||||
if (copy_from_user(nodes_addr(*nodes), nmask, nlongs*sizeof(unsigned long)))
|
||||
return -EFAULT;
|
||||
nodes_addr(*nodes)[nlongs-1] &= endmask;
|
||||
/* Update current mems_allowed */
|
||||
cpuset_update_current_mems_allowed();
|
||||
/* Ignore nodes not set in current->mems_allowed */
|
||||
/* AK: shouldn't this error out instead? */
|
||||
cpuset_restrict_to_mems_allowed(nodes_addr(*nodes));
|
||||
return mpol_check_policy(mode, nodes);
|
||||
}
|
||||
|
||||
/* Generate a custom zonelist for the BIND policy. */
|
||||
static struct zonelist *bind_zonelist(nodemask_t *nodes)
|
||||
{
|
||||
@ -380,17 +337,25 @@ static int mbind_range(struct vm_area_struct *vma, unsigned long start,
|
||||
return err;
|
||||
}
|
||||
|
||||
/* Change policy for a memory range */
|
||||
asmlinkage long sys_mbind(unsigned long start, unsigned long len,
|
||||
unsigned long mode,
|
||||
unsigned long __user *nmask, unsigned long maxnode,
|
||||
unsigned flags)
|
||||
static int contextualize_policy(int mode, nodemask_t *nodes)
|
||||
{
|
||||
if (!nodes)
|
||||
return 0;
|
||||
|
||||
/* Update current mems_allowed */
|
||||
cpuset_update_current_mems_allowed();
|
||||
/* Ignore nodes not set in current->mems_allowed */
|
||||
cpuset_restrict_to_mems_allowed(nodes->bits);
|
||||
return mpol_check_policy(mode, nodes);
|
||||
}
|
||||
|
||||
long do_mbind(unsigned long start, unsigned long len,
|
||||
unsigned long mode, nodemask_t *nmask, unsigned long flags)
|
||||
{
|
||||
struct vm_area_struct *vma;
|
||||
struct mm_struct *mm = current->mm;
|
||||
struct mempolicy *new;
|
||||
unsigned long end;
|
||||
nodemask_t nodes;
|
||||
int err;
|
||||
|
||||
if ((flags & ~(unsigned long)(MPOL_MF_STRICT)) || mode > MPOL_MAX)
|
||||
@ -405,12 +370,9 @@ asmlinkage long sys_mbind(unsigned long start, unsigned long len,
|
||||
return -EINVAL;
|
||||
if (end == start)
|
||||
return 0;
|
||||
|
||||
err = get_nodes(&nodes, nmask, maxnode, mode);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
new = mpol_new(mode, &nodes);
|
||||
if (contextualize_policy(mode, nmask))
|
||||
return -EINVAL;
|
||||
new = mpol_new(mode, nmask);
|
||||
if (IS_ERR(new))
|
||||
return PTR_ERR(new);
|
||||
|
||||
@ -418,7 +380,7 @@ asmlinkage long sys_mbind(unsigned long start, unsigned long len,
|
||||
mode,nodes_addr(nodes)[0]);
|
||||
|
||||
down_write(&mm->mmap_sem);
|
||||
vma = check_range(mm, start, end, &nodes, flags);
|
||||
vma = check_range(mm, start, end, nmask, flags);
|
||||
err = PTR_ERR(vma);
|
||||
if (!IS_ERR(vma))
|
||||
err = mbind_range(vma, start, end, new);
|
||||
@ -428,19 +390,13 @@ asmlinkage long sys_mbind(unsigned long start, unsigned long len,
|
||||
}
|
||||
|
||||
/* Set the process memory policy */
|
||||
asmlinkage long sys_set_mempolicy(int mode, unsigned long __user *nmask,
|
||||
unsigned long maxnode)
|
||||
long do_set_mempolicy(int mode, nodemask_t *nodes)
|
||||
{
|
||||
int err;
|
||||
struct mempolicy *new;
|
||||
nodemask_t nodes;
|
||||
|
||||
if (mode < 0 || mode > MPOL_MAX)
|
||||
if (contextualize_policy(mode, nodes))
|
||||
return -EINVAL;
|
||||
err = get_nodes(&nodes, nmask, maxnode, mode);
|
||||
if (err)
|
||||
return err;
|
||||
new = mpol_new(mode, &nodes);
|
||||
new = mpol_new(mode, nodes);
|
||||
if (IS_ERR(new))
|
||||
return PTR_ERR(new);
|
||||
mpol_free(current->mempolicy);
|
||||
@ -459,7 +415,8 @@ static void get_zonemask(struct mempolicy *p, nodemask_t *nodes)
|
||||
switch (p->policy) {
|
||||
case MPOL_BIND:
|
||||
for (i = 0; p->v.zonelist->zones[i]; i++)
|
||||
node_set(p->v.zonelist->zones[i]->zone_pgdat->node_id, *nodes);
|
||||
node_set(p->v.zonelist->zones[i]->zone_pgdat->node_id,
|
||||
*nodes);
|
||||
break;
|
||||
case MPOL_DEFAULT:
|
||||
break;
|
||||
@ -491,38 +448,17 @@ static int lookup_node(struct mm_struct *mm, unsigned long addr)
|
||||
return err;
|
||||
}
|
||||
|
||||
/* Copy a kernel node mask to user space */
|
||||
static int copy_nodes_to_user(unsigned long __user *mask, unsigned long maxnode,
|
||||
nodemask_t *nodes)
|
||||
{
|
||||
unsigned long copy = ALIGN(maxnode-1, 64) / 8;
|
||||
const int nbytes = BITS_TO_LONGS(MAX_NUMNODES) * sizeof(long);
|
||||
|
||||
if (copy > nbytes) {
|
||||
if (copy > PAGE_SIZE)
|
||||
return -EINVAL;
|
||||
if (clear_user((char __user *)mask + nbytes, copy - nbytes))
|
||||
return -EFAULT;
|
||||
copy = nbytes;
|
||||
}
|
||||
return copy_to_user(mask, nodes_addr(*nodes), copy) ? -EFAULT : 0;
|
||||
}
|
||||
|
||||
/* Retrieve NUMA policy */
|
||||
asmlinkage long sys_get_mempolicy(int __user *policy,
|
||||
unsigned long __user *nmask,
|
||||
unsigned long maxnode,
|
||||
unsigned long addr, unsigned long flags)
|
||||
long do_get_mempolicy(int *policy, nodemask_t *nmask,
|
||||
unsigned long addr, unsigned long flags)
|
||||
{
|
||||
int err, pval;
|
||||
int err;
|
||||
struct mm_struct *mm = current->mm;
|
||||
struct vm_area_struct *vma = NULL;
|
||||
struct mempolicy *pol = current->mempolicy;
|
||||
|
||||
if (flags & ~(unsigned long)(MPOL_F_NODE|MPOL_F_ADDR))
|
||||
return -EINVAL;
|
||||
if (nmask != NULL && maxnode < MAX_NUMNODES)
|
||||
return -EINVAL;
|
||||
if (flags & MPOL_F_ADDR) {
|
||||
down_read(&mm->mmap_sem);
|
||||
vma = find_vma_intersection(mm, addr, addr+1);
|
||||
@ -545,31 +481,25 @@ asmlinkage long sys_get_mempolicy(int __user *policy,
|
||||
err = lookup_node(mm, addr);
|
||||
if (err < 0)
|
||||
goto out;
|
||||
pval = err;
|
||||
*policy = err;
|
||||
} else if (pol == current->mempolicy &&
|
||||
pol->policy == MPOL_INTERLEAVE) {
|
||||
pval = current->il_next;
|
||||
*policy = current->il_next;
|
||||
} else {
|
||||
err = -EINVAL;
|
||||
goto out;
|
||||
}
|
||||
} else
|
||||
pval = pol->policy;
|
||||
*policy = pol->policy;
|
||||
|
||||
if (vma) {
|
||||
up_read(¤t->mm->mmap_sem);
|
||||
vma = NULL;
|
||||
}
|
||||
|
||||
if (policy && put_user(pval, policy))
|
||||
return -EFAULT;
|
||||
|
||||
err = 0;
|
||||
if (nmask) {
|
||||
nodemask_t nodes;
|
||||
get_zonemask(pol, &nodes);
|
||||
err = copy_nodes_to_user(nmask, maxnode, &nodes);
|
||||
}
|
||||
if (nmask)
|
||||
get_zonemask(pol, nmask);
|
||||
|
||||
out:
|
||||
if (vma)
|
||||
@ -577,6 +507,126 @@ asmlinkage long sys_get_mempolicy(int __user *policy,
|
||||
return err;
|
||||
}
|
||||
|
||||
/*
|
||||
* User space interface with variable sized bitmaps for nodelists.
|
||||
*/
|
||||
|
||||
/* Copy a node mask from user space. */
|
||||
static int get_nodes(nodemask_t *nodes, unsigned long __user *nmask,
|
||||
unsigned long maxnode)
|
||||
{
|
||||
unsigned long k;
|
||||
unsigned long nlongs;
|
||||
unsigned long endmask;
|
||||
|
||||
--maxnode;
|
||||
nodes_clear(*nodes);
|
||||
if (maxnode == 0 || !nmask)
|
||||
return 0;
|
||||
|
||||
nlongs = BITS_TO_LONGS(maxnode);
|
||||
if ((maxnode % BITS_PER_LONG) == 0)
|
||||
endmask = ~0UL;
|
||||
else
|
||||
endmask = (1UL << (maxnode % BITS_PER_LONG)) - 1;
|
||||
|
||||
/* When the user specified more nodes than supported just check
|
||||
if the non supported part is all zero. */
|
||||
if (nlongs > BITS_TO_LONGS(MAX_NUMNODES)) {
|
||||
if (nlongs > PAGE_SIZE/sizeof(long))
|
||||
return -EINVAL;
|
||||
for (k = BITS_TO_LONGS(MAX_NUMNODES); k < nlongs; k++) {
|
||||
unsigned long t;
|
||||
if (get_user(t, nmask + k))
|
||||
return -EFAULT;
|
||||
if (k == nlongs - 1) {
|
||||
if (t & endmask)
|
||||
return -EINVAL;
|
||||
} else if (t)
|
||||
return -EINVAL;
|
||||
}
|
||||
nlongs = BITS_TO_LONGS(MAX_NUMNODES);
|
||||
endmask = ~0UL;
|
||||
}
|
||||
|
||||
if (copy_from_user(nodes_addr(*nodes), nmask, nlongs*sizeof(unsigned long)))
|
||||
return -EFAULT;
|
||||
nodes_addr(*nodes)[nlongs-1] &= endmask;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Copy a kernel node mask to user space */
|
||||
static int copy_nodes_to_user(unsigned long __user *mask, unsigned long maxnode,
|
||||
nodemask_t *nodes)
|
||||
{
|
||||
unsigned long copy = ALIGN(maxnode-1, 64) / 8;
|
||||
const int nbytes = BITS_TO_LONGS(MAX_NUMNODES) * sizeof(long);
|
||||
|
||||
if (copy > nbytes) {
|
||||
if (copy > PAGE_SIZE)
|
||||
return -EINVAL;
|
||||
if (clear_user((char __user *)mask + nbytes, copy - nbytes))
|
||||
return -EFAULT;
|
||||
copy = nbytes;
|
||||
}
|
||||
return copy_to_user(mask, nodes_addr(*nodes), copy) ? -EFAULT : 0;
|
||||
}
|
||||
|
||||
asmlinkage long sys_mbind(unsigned long start, unsigned long len,
|
||||
unsigned long mode,
|
||||
unsigned long __user *nmask, unsigned long maxnode,
|
||||
unsigned flags)
|
||||
{
|
||||
nodemask_t nodes;
|
||||
int err;
|
||||
|
||||
err = get_nodes(&nodes, nmask, maxnode);
|
||||
if (err)
|
||||
return err;
|
||||
return do_mbind(start, len, mode, &nodes, flags);
|
||||
}
|
||||
|
||||
/* Set the process memory policy */
|
||||
asmlinkage long sys_set_mempolicy(int mode, unsigned long __user *nmask,
|
||||
unsigned long maxnode)
|
||||
{
|
||||
int err;
|
||||
nodemask_t nodes;
|
||||
|
||||
if (mode < 0 || mode > MPOL_MAX)
|
||||
return -EINVAL;
|
||||
err = get_nodes(&nodes, nmask, maxnode);
|
||||
if (err)
|
||||
return err;
|
||||
return do_set_mempolicy(mode, &nodes);
|
||||
}
|
||||
|
||||
/* Retrieve NUMA policy */
|
||||
asmlinkage long sys_get_mempolicy(int __user *policy,
|
||||
unsigned long __user *nmask,
|
||||
unsigned long maxnode,
|
||||
unsigned long addr, unsigned long flags)
|
||||
{
|
||||
int err, pval;
|
||||
nodemask_t nodes;
|
||||
|
||||
if (nmask != NULL && maxnode < MAX_NUMNODES)
|
||||
return -EINVAL;
|
||||
|
||||
err = do_get_mempolicy(&pval, &nodes, addr, flags);
|
||||
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
if (policy && put_user(pval, policy))
|
||||
return -EFAULT;
|
||||
|
||||
if (nmask)
|
||||
err = copy_nodes_to_user(nmask, maxnode, &nodes);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_COMPAT
|
||||
|
||||
asmlinkage long compat_sys_get_mempolicy(int __user *policy,
|
||||
@ -664,7 +714,7 @@ get_vma_policy(struct task_struct *task, struct vm_area_struct *vma, unsigned lo
|
||||
|
||||
if (vma) {
|
||||
if (vma->vm_ops && vma->vm_ops->get_policy)
|
||||
pol = vma->vm_ops->get_policy(vma, addr);
|
||||
pol = vma->vm_ops->get_policy(vma, addr);
|
||||
else if (vma->vm_policy &&
|
||||
vma->vm_policy->policy != MPOL_DEFAULT)
|
||||
pol = vma->vm_policy;
|
||||
@ -1147,14 +1197,12 @@ void __init numa_policy_init(void)
|
||||
/* Set interleaving policy for system init. This way not all
|
||||
the data structures allocated at system boot end up in node zero. */
|
||||
|
||||
if (sys_set_mempolicy(MPOL_INTERLEAVE, nodes_addr(node_online_map),
|
||||
MAX_NUMNODES) < 0)
|
||||
if (do_set_mempolicy(MPOL_INTERLEAVE, &node_online_map))
|
||||
printk("numa_policy_init: interleaving failed\n");
|
||||
}
|
||||
|
||||
/* Reset policy of current process to default.
|
||||
* Assumes fs == KERNEL_DS */
|
||||
/* Reset policy of current process to default */
|
||||
void numa_default_policy(void)
|
||||
{
|
||||
sys_set_mempolicy(MPOL_DEFAULT, NULL, 0);
|
||||
do_set_mempolicy(MPOL_DEFAULT, NULL);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user