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mempolicy trivia: slightly more consistent naming

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Before getting down to work, do a little cleanup, mainly of inconsistent
variable naming.  I gave up trying to rationalize mpol versus pol versus
policy, and node versus nid, but let's avoid p and nd.  Remove a few
superfluous blank lines, but add one; and here prefer vma->vm_policy to
vma_policy(vma) - the latter being appropriate in other sources, which
have to allow for !CONFIG_NUMA.  That intriguing line about KERNEL_DS? 
should have gone in v2.6.15, when numa_policy_init() stopped using
set_mempolicy(2)'s system call handler.

Link: https://lkml.kernel.org/r/68287974-b6ae-7df-4ba-d19ddd69cbf@google.com
Signed-off-by: Hugh Dickins <hughd@google.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Tejun heo <tj@kernel.org>
Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Yosry Ahmed <yosryahmed@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2023-10-03 02:20:14 -07:00 committed by Andrew Morton
parent 7f1ee4e207
commit c36f6e6dff
2 changed files with 38 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
include/linux/mempolicy.h
View File

@ -124,10 +124,9 @@ struct shared_policy {
int vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst);
void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol);
int mpol_set_shared_policy(struct shared_policy *info,
struct vm_area_struct *vma,
struct mempolicy *new);
void mpol_free_shared_policy(struct shared_policy *p);
int mpol_set_shared_policy(struct shared_policy *sp,
struct vm_area_struct *vma, struct mempolicy *mpol);
void mpol_free_shared_policy(struct shared_policy *sp);
struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp,
unsigned long idx);
@ -191,7 +190,7 @@ static inline bool mpol_equal(struct mempolicy *a, struct mempolicy *b)
return true;
}
static inline void mpol_put(struct mempolicy *p)
static inline void mpol_put(struct mempolicy *pol)
{
}
@ -210,7 +209,7 @@ static inline void mpol_shared_policy_init(struct shared_policy *sp,
{
}
static inline void mpol_free_shared_policy(struct shared_policy *p)
static inline void mpol_free_shared_policy(struct shared_policy *sp)
{
}

73
mm/mempolicy.c
View File

@ -25,7 +25,7 @@
* 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.
* preferred Try a specific node first before normal fallback.
* As a special case NUMA_NO_NODE 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
@ -52,7 +52,7 @@
* on systems with highmem kernel lowmem allocation don't get policied.
* Same with GFP_DMA allocations.
*
* For shmfs/tmpfs/hugetlbfs shared memory the policy is shared between
* For shmem/tmpfs shared memory the policy is shared between
* all users and remembered even when nobody has memory mapped.
*/
@ -291,6 +291,7 @@ static struct mempolicy *mpol_new(unsigned short mode, unsigned short flags,
return ERR_PTR(-EINVAL);
} else if (nodes_empty(*nodes))
return ERR_PTR(-EINVAL);
policy = kmem_cache_alloc(policy_cache, GFP_KERNEL);
if (!policy)
return ERR_PTR(-ENOMEM);
@ -303,11 +304,11 @@ static struct mempolicy *mpol_new(unsigned short mode, unsigned short flags,
}
/* Slow path of a mpol destructor. */
void __mpol_put(struct mempolicy *p)
void __mpol_put(struct mempolicy *pol)
{
if (!atomic_dec_and_test(&p->refcnt))
if (!atomic_dec_and_test(&pol->refcnt))
return;
kmem_cache_free(policy_cache, p);
kmem_cache_free(policy_cache, pol);
}
static void mpol_rebind_default(struct mempolicy *pol, const nodemask_t *nodes)
@ -364,7 +365,6 @@ static void mpol_rebind_policy(struct mempolicy *pol, const nodemask_t *newmask)
*
* Called with task's alloc_lock held.
*/
void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new)
{
mpol_rebind_policy(tsk->mempolicy, new);
@ -375,7 +375,6 @@ void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new)
*
* Call holding a reference to mm. Takes mm->mmap_lock during call.
*/
void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new)
{
struct vm_area_struct *vma;
@ -757,7 +756,7 @@ queue_pages_range(struct mm_struct *mm, unsigned long start, unsigned long end,
* This must be called with the mmap_lock held for writing.
*/
static int vma_replace_policy(struct vm_area_struct *vma,
struct mempolicy *pol)
struct mempolicy *pol)
{
int err;
struct mempolicy *old;
@ -800,7 +799,7 @@ static int mbind_range(struct vma_iterator *vmi, struct vm_area_struct *vma,
vmstart = vma->vm_start;
}
if (mpol_equal(vma_policy(vma), new_pol)) {
if (mpol_equal(vma->vm_policy, new_pol)) {
*prev = vma;
return 0;
}
@ -855,18 +854,18 @@ out:
*
* Called with task's alloc_lock held
*/
static void get_policy_nodemask(struct mempolicy *p, nodemask_t *nodes)
static void get_policy_nodemask(struct mempolicy *pol, nodemask_t *nodes)
{
nodes_clear(*nodes);
if (p == &default_policy)
if (pol == &default_policy)
return;
switch (p->mode) {
switch (pol->mode) {
case MPOL_BIND:
case MPOL_INTERLEAVE:
case MPOL_PREFERRED:
case MPOL_PREFERRED_MANY:
*nodes = p->nodes;
*nodes = pol->nodes;
break;
case MPOL_LOCAL:
/* return empty node mask for local allocation */
@ -1634,7 +1633,6 @@ out:
out_put:
put_task_struct(task);
goto out;
}
SYSCALL_DEFINE4(migrate_pages, pid_t, pid, unsigned long, maxnode,
@ -1644,7 +1642,6 @@ SYSCALL_DEFINE4(migrate_pages, pid_t, pid, unsigned long, maxnode,
return kernel_migrate_pages(pid, maxnode, old_nodes, new_nodes);
}
/* Retrieve NUMA policy */
static int kernel_get_mempolicy(int __user *policy,
unsigned long __user *nmask,
@ -1827,10 +1824,10 @@ nodemask_t *policy_nodemask(gfp_t gfp, struct mempolicy *policy)
* policy_node() is always coupled with policy_nodemask(), which
* secures the nodemask limit for 'bind' and 'prefer-many' policy.
*/
static int policy_node(gfp_t gfp, struct mempolicy *policy, int nd)
static int policy_node(gfp_t gfp, struct mempolicy *policy, int nid)
{
if (policy->mode == MPOL_PREFERRED) {
nd = first_node(policy->nodes);
nid = first_node(policy->nodes);
} else {
/*
* __GFP_THISNODE shouldn't even be used with the bind policy
@ -1845,19 +1842,18 @@ static int policy_node(gfp_t gfp, struct mempolicy *policy, int nd)
policy->home_node != NUMA_NO_NODE)
return policy->home_node;
return nd;
return nid;
}
/* Do dynamic interleaving for a process */
static unsigned interleave_nodes(struct mempolicy *policy)
static unsigned int interleave_nodes(struct mempolicy *policy)
{
unsigned next;
struct task_struct *me = current;
unsigned int nid;
next = next_node_in(me->il_prev, policy->nodes);
if (next < MAX_NUMNODES)
me->il_prev = next;
return next;
nid = next_node_in(current->il_prev, policy->nodes);
if (nid < MAX_NUMNODES)
current->il_prev = nid;
return nid;
}
/*
@ -2347,7 +2343,7 @@ unsigned long alloc_pages_bulk_array_mempolicy(gfp_t gfp,
int vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst)
{
struct mempolicy *pol = mpol_dup(vma_policy(src));
struct mempolicy *pol = mpol_dup(src->vm_policy);
if (IS_ERR(pol))
return PTR_ERR(pol);
@ -2771,40 +2767,40 @@ put_mpol:
}
}
int mpol_set_shared_policy(struct shared_policy *info,
struct vm_area_struct *vma, struct mempolicy *npol)
int mpol_set_shared_policy(struct shared_policy *sp,
struct vm_area_struct *vma, struct mempolicy *pol)
{
int err;
struct sp_node *new = NULL;
unsigned long sz = vma_pages(vma);
if (npol) {
new = sp_alloc(vma->vm_pgoff, vma->vm_pgoff + sz, npol);
if (pol) {
new = sp_alloc(vma->vm_pgoff, vma->vm_pgoff + sz, pol);
if (!new)
return -ENOMEM;
}
err = shared_policy_replace(info, vma->vm_pgoff, vma->vm_pgoff+sz, new);
err = shared_policy_replace(sp, vma->vm_pgoff, vma->vm_pgoff + sz, new);
if (err && new)
sp_free(new);
return err;
}
/* Free a backing policy store on inode delete. */
void mpol_free_shared_policy(struct shared_policy *p)
void mpol_free_shared_policy(struct shared_policy *sp)
{
struct sp_node *n;
struct rb_node *next;
if (!p->root.rb_node)
if (!sp->root.rb_node)
return;
write_lock(&p->lock);
next = rb_first(&p->root);
write_lock(&sp->lock);
next = rb_first(&sp->root);
while (next) {
n = rb_entry(next, struct sp_node, nd);
next = rb_next(&n->nd);
sp_delete(p, n);
sp_delete(sp, n);
}
write_unlock(&p->lock);
write_unlock(&sp->lock);
}
#ifdef CONFIG_NUMA_BALANCING
@ -2854,7 +2850,6 @@ static inline void __init check_numabalancing_enable(void)
}
#endif /* CONFIG_NUMA_BALANCING */
/* assumes fs == KERNEL_DS */
void __init numa_policy_init(void)
{
nodemask_t interleave_nodes;
@ -2917,7 +2912,6 @@ void numa_default_policy(void)
/*
* Parse and format mempolicy from/to strings
*/
static const char * const policy_modes[] =
{
[MPOL_DEFAULT] = "default",
@ -2928,7 +2922,6 @@ static const char * const policy_modes[] =
[MPOL_PREFERRED_MANY] = "prefer (many)",
};
#ifdef CONFIG_TMPFS
/**
* mpol_parse_str - parse string to mempolicy, for tmpfs mpol mount option.