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authorHugh Dickins <hughd@google.com>2023-10-03 12:20:14 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-10-26 02:47:15 +0300
commitc36f6e6dff4d32ec8b6da8f553933727a57a7a4a (patch)
tree175d0ad7bffbd70f17f356975e1f329411519cb8 /mm/mempolicy.c
parent7f1ee4e2070883d18a431c761db8bb30a958b654 (diff)
downloadlinux-c36f6e6dff4d32ec8b6da8f553933727a57a7a4a.tar.xz
mempolicy trivia: slightly more consistent naming
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>
Diffstat (limited to 'mm/mempolicy.c')
-rw-r--r--mm/mempolicy.c73
1 files changed, 33 insertions, 40 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 02a9b89c10aa..50a57f4c8013 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -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.