* [PATCH] Use node macros for memory policies
@ 2005-09-23 18:10 Christoph Lameter
2005-09-23 21:57 ` Andrew Morton
0 siblings, 1 reply; 4+ messages in thread
From: Christoph Lameter @ 2005-09-23 18:10 UTC (permalink / raw)
To: ak, akpm; +Cc: linux-mm
Use node macros for memory policies
1. Use node macros throughout instead of bitmaps
3. Blank fixes and clarifying comments.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Index: linux-2.6.14-rc2/include/linux/mempolicy.h
===================================================================
--- linux-2.6.14-rc2.orig/include/linux/mempolicy.h 2005-09-19 20:00:41.000000000 -0700
+++ linux-2.6.14-rc2/include/linux/mempolicy.h 2005-09-23 11:08:38.000000000 -0700
@@ -27,7 +27,7 @@
#include <linux/config.h>
#include <linux/mmzone.h>
-#include <linux/bitmap.h>
+#include <linux/nodemask.h>
#include <linux/slab.h>
#include <linux/rbtree.h>
#include <linux/spinlock.h>
@@ -63,7 +63,7 @@ struct mempolicy {
union {
struct zonelist *zonelist; /* bind */
short preferred_node; /* preferred */
- DECLARE_BITMAP(nodes, MAX_NUMNODES); /* interleave */
+ nodemask_t nodes; /* interleave */
/* undefined for default */
} v;
};
Index: linux-2.6.14-rc2/mm/mempolicy.c
===================================================================
--- linux-2.6.14-rc2.orig/mm/mempolicy.c 2005-09-19 20:00:41.000000000 -0700
+++ linux-2.6.14-rc2/mm/mempolicy.c 2005-09-23 11:08:38.000000000 -0700
@@ -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 +18,18 @@
* 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.
- * preferred Try a specific node first before normal fallback.
+ * FIXME: Memory is allocated starting from the lowest node.
+ * It would be better to use the nearest node 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.
@@ -94,22 +100,22 @@ struct mempolicy default_policy = {
};
/* Check if all specified nodes are online */
-static int nodes_online(unsigned long *nodes)
+static int nodes_online(nodemask_t *nodes)
{
- DECLARE_BITMAP(online2, MAX_NUMNODES);
+ nodemask_t online2;
- bitmap_copy(online2, nodes_addr(node_online_map), MAX_NUMNODES);
- if (bitmap_empty(online2, MAX_NUMNODES))
- set_bit(0, online2);
- if (!bitmap_subset(nodes, online2, MAX_NUMNODES))
+ online2 = node_online_map;
+ if (nodes_empty(online2))
+ node_set(0, online2);
+ if (!nodes_subset(*nodes, online2))
return -EINVAL;
return 0;
}
/* Do sanity checking on a policy */
-static int mpol_check_policy(int mode, unsigned long *nodes)
+static int mpol_check_policy(int mode, nodemask_t *nodes)
{
- int empty = bitmap_empty(nodes, MAX_NUMNODES);
+ int empty = nodes_empty(*nodes);
switch (mode) {
case MPOL_DEFAULT:
@@ -128,7 +134,7 @@ static int mpol_check_policy(int mode, u
}
/* Copy a node mask from user space. */
-static int get_nodes(unsigned long *nodes, unsigned long __user *nmask,
+static int get_nodes(nodemask_t *nodes, unsigned long __user *nmask,
unsigned long maxnode, int mode)
{
unsigned long k;
@@ -136,7 +142,7 @@ static int get_nodes(unsigned long *node
unsigned long endmask;
--maxnode;
- bitmap_zero(nodes, MAX_NUMNODES);
+ nodes_clear(*nodes);
if (maxnode == 0 || !nmask)
return 0;
@@ -167,7 +173,7 @@ static int get_nodes(unsigned long *node
if (copy_from_user(nodes, nmask, nlongs*sizeof(unsigned long)))
return -EFAULT;
- nodes[nlongs-1] &= endmask;
+ nodes_addr(*nodes)[nlongs - 1] &= endmask;
/* Update current mems_allowed */
cpuset_update_current_mems_allowed();
/* Ignore nodes not set in current->mems_allowed */
@@ -176,21 +182,21 @@ static int get_nodes(unsigned long *node
}
/* Generate a custom zonelist for the BIND policy. */
-static struct zonelist *bind_zonelist(unsigned long *nodes)
+static struct zonelist *bind_zonelist(nodemask_t *nodes)
{
struct zonelist *zl;
int num, max, nd;
- max = 1 + MAX_NR_ZONES * bitmap_weight(nodes, MAX_NUMNODES);
+ max = 1 + MAX_NR_ZONES * nodes_weight(*nodes);
zl = kmalloc(sizeof(void *) * max, GFP_KERNEL);
if (!zl)
return NULL;
num = 0;
- for (nd = find_first_bit(nodes, MAX_NUMNODES);
+ for (nd = first_node(*nodes);
nd < MAX_NUMNODES;
- nd = find_next_bit(nodes, MAX_NUMNODES, 1+nd)) {
+ nd = next_node(1 + nd, *nodes)) {
int k;
- for (k = MAX_NR_ZONES-1; k >= 0; k--) {
+ for (k = MAX_NR_ZONES - 1; k >= 0; k--) {
struct zone *z = &NODE_DATA(nd)->node_zones[k];
if (!z->present_pages)
continue;
@@ -205,11 +211,11 @@ static struct zonelist *bind_zonelist(un
}
/* Create a new policy */
-static struct mempolicy *mpol_new(int mode, unsigned long *nodes)
+static struct mempolicy *mpol_new(int mode, nodemask_t *nodes)
{
struct mempolicy *policy;
- PDprintk("setting mode %d nodes[0] %lx\n", mode, nodes[0]);
+ PDprintk("setting mode %d nodes[0] %lx\n", mode, nodes.bits[0]);
if (mode == MPOL_DEFAULT)
return NULL;
policy = kmem_cache_alloc(policy_cache, GFP_KERNEL);
@@ -218,10 +224,10 @@ static struct mempolicy *mpol_new(int mo
atomic_set(&policy->refcnt, 1);
switch (mode) {
case MPOL_INTERLEAVE:
- bitmap_copy(policy->v.nodes, nodes, MAX_NUMNODES);
+ policy->v.nodes = *nodes;
break;
case MPOL_PREFERRED:
- policy->v.preferred_node = find_first_bit(nodes, MAX_NUMNODES);
+ policy->v.preferred_node = first_node(*nodes);
if (policy->v.preferred_node >= MAX_NUMNODES)
policy->v.preferred_node = -1;
break;
@@ -239,7 +245,7 @@ static struct mempolicy *mpol_new(int mo
/* Ensure all existing pages follow the policy. */
static int check_pte_range(struct mm_struct *mm, pmd_t *pmd,
- unsigned long addr, unsigned long end, unsigned long *nodes)
+ unsigned long addr, unsigned long end, nodemask_t *nodes)
{
pte_t *orig_pte;
pte_t *pte;
@@ -256,7 +262,7 @@ static int check_pte_range(struct mm_str
if (!pfn_valid(pfn))
continue;
nid = pfn_to_nid(pfn);
- if (!test_bit(nid, nodes))
+ if (!node_isset(nid, *nodes))
break;
} while (pte++, addr += PAGE_SIZE, addr != end);
pte_unmap(orig_pte);
@@ -265,7 +271,7 @@ static int check_pte_range(struct mm_str
}
static inline int check_pmd_range(struct mm_struct *mm, pud_t *pud,
- unsigned long addr, unsigned long end, unsigned long *nodes)
+ unsigned long addr, unsigned long end, nodemask_t *nodes)
{
pmd_t *pmd;
unsigned long next;
@@ -282,7 +288,7 @@ static inline int check_pmd_range(struct
}
static inline int check_pud_range(struct mm_struct *mm, pgd_t *pgd,
- unsigned long addr, unsigned long end, unsigned long *nodes)
+ unsigned long addr, unsigned long end, nodemask_t *nodes)
{
pud_t *pud;
unsigned long next;
@@ -299,7 +305,7 @@ static inline int check_pud_range(struct
}
static inline int check_pgd_range(struct mm_struct *mm,
- unsigned long addr, unsigned long end, unsigned long *nodes)
+ unsigned long addr, unsigned long end, nodemask_t *nodes)
{
pgd_t *pgd;
unsigned long next;
@@ -318,7 +324,7 @@ static inline int check_pgd_range(struct
/* Step 1: check the range */
static struct vm_area_struct *
check_range(struct mm_struct *mm, unsigned long start, unsigned long end,
- unsigned long *nodes, unsigned long flags)
+ nodemask_t *nodes, unsigned long flags)
{
int err;
struct vm_area_struct *first, *vma, *prev;
@@ -403,7 +409,7 @@ asmlinkage long sys_mbind(unsigned long
struct mm_struct *mm = current->mm;
struct mempolicy *new;
unsigned long end;
- DECLARE_BITMAP(nodes, MAX_NUMNODES);
+ nodemask_t nodes;
int err;
if ((flags & ~(unsigned long)(MPOL_MF_STRICT)) || mode > MPOL_MAX)
@@ -419,11 +425,11 @@ asmlinkage long sys_mbind(unsigned long
if (end == start)
return 0;
- err = get_nodes(nodes, nmask, maxnode, mode);
+ 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);
@@ -431,7 +437,7 @@ asmlinkage long sys_mbind(unsigned long
mode,nodes[0]);
down_write(&mm->mmap_sem);
- vma = check_range(mm, start, end, nodes, flags);
+ vma = check_range(mm, start, end, &nodes, flags);
err = PTR_ERR(vma);
if (!IS_ERR(vma))
err = mbind_range(vma, start, end, new);
@@ -446,45 +452,47 @@ asmlinkage long sys_set_mempolicy(int mo
{
int err;
struct mempolicy *new;
- DECLARE_BITMAP(nodes, MAX_NUMNODES);
+ nodemask_t nodes;
if (mode < 0 || mode > MPOL_MAX)
return -EINVAL;
- err = get_nodes(nodes, nmask, maxnode, mode);
+ 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);
current->mempolicy = new;
if (new && new->policy == MPOL_INTERLEAVE)
- current->il_next = find_first_bit(new->v.nodes, MAX_NUMNODES);
+ current->il_next = first_node(new->v.nodes);
return 0;
}
/* Fill a zone bitmap for a policy */
-static void get_zonemask(struct mempolicy *p, unsigned long *nodes)
+static void get_zonemask(struct mempolicy *p, nodemask_t *nodes)
{
int i;
- bitmap_zero(nodes, MAX_NUMNODES);
+ nodes_clear(*nodes);
switch (p->policy) {
case MPOL_BIND:
for (i = 0; p->v.zonelist->zones[i]; i++)
- __set_bit(p->v.zonelist->zones[i]->zone_pgdat->node_id, nodes);
+ /* No need to have atomic set operations here */
+ __set_bit(p->v.zonelist->zones[i]->zone_pgdat->node_id, nodes->bits);
break;
case MPOL_DEFAULT:
break;
case MPOL_INTERLEAVE:
- bitmap_copy(nodes, p->v.nodes, MAX_NUMNODES);
+ *nodes = p->v.nodes;
break;
case MPOL_PREFERRED:
/* or use current node instead of online map? */
if (p->v.preferred_node < 0)
- bitmap_copy(nodes, nodes_addr(node_online_map), MAX_NUMNODES);
+ *nodes = node_online_map;
else
- __set_bit(p->v.preferred_node, nodes);
+ /* No need for an atomic set operation here */
+ __set_bit(p->v.preferred_node, nodes->bits);
break;
default:
BUG();
@@ -506,9 +514,9 @@ static int lookup_node(struct mm_struct
/* Copy a kernel node mask to user space */
static int copy_nodes_to_user(unsigned long __user *mask, unsigned long maxnode,
- void *nodes, unsigned nbytes)
+ nodemask_t *nodes, unsigned nbytes)
{
- unsigned long copy = ALIGN(maxnode-1, 64) / 8;
+ unsigned long copy = ALIGN(maxnode - 1, 64) / 8;
if (copy > nbytes) {
if (copy > PAGE_SIZE)
@@ -537,7 +545,7 @@ asmlinkage long sys_get_mempolicy(int __
return -EINVAL;
if (flags & MPOL_F_ADDR) {
down_read(&mm->mmap_sem);
- vma = find_vma_intersection(mm, addr, addr+1);
+ vma = find_vma_intersection(mm, addr, addr + 1);
if (!vma) {
up_read(&mm->mmap_sem);
return -EFAULT;
@@ -578,9 +586,9 @@ asmlinkage long sys_get_mempolicy(int __
err = 0;
if (nmask) {
- DECLARE_BITMAP(nodes, MAX_NUMNODES);
- get_zonemask(pol, nodes);
- err = copy_nodes_to_user(nmask, maxnode, nodes, sizeof(nodes));
+ nodemask_t nodes;
+ get_zonemask(pol, &nodes);
+ err = copy_nodes_to_user(nmask, maxnode, &nodes, sizeof(nodes));
}
out:
@@ -590,7 +598,10 @@ asmlinkage long sys_get_mempolicy(int __
}
#ifdef CONFIG_COMPAT
-
+/*
+ * We need to fall back here on bitmap functions since there is no
+ * support for compat nodemaps in the kernel.
+ */
asmlinkage long compat_sys_get_mempolicy(int __user *policy,
compat_ulong_t __user *nmask,
compat_ulong_t maxnode,
@@ -599,21 +610,21 @@ asmlinkage long compat_sys_get_mempolicy
long err;
unsigned long __user *nm = NULL;
unsigned long nr_bits, alloc_size;
- DECLARE_BITMAP(bm, MAX_NUMNODES);
+ nodemask_t bm;
- nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES);
+ nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
if (nmask)
nm = compat_alloc_user_space(alloc_size);
- err = sys_get_mempolicy(policy, nm, nr_bits+1, addr, flags);
+ err = sys_get_mempolicy(policy, nm, nr_bits + 1, addr, flags);
if (!err && nmask) {
- err = copy_from_user(bm, nm, alloc_size);
+ err = copy_from_user(&bm, nm, alloc_size);
/* ensure entire bitmap is zeroed */
- err |= clear_user(nmask, ALIGN(maxnode-1, 8) / 8);
- err |= compat_put_bitmap(nmask, bm, nr_bits);
+ err |= clear_user(nmask, ALIGN(maxnode - 1, 8) / 8);
+ err |= compat_put_bitmap(nmask, nodes_addr(bm), nr_bits);
}
return err;
@@ -625,21 +636,21 @@ asmlinkage long compat_sys_set_mempolicy
long err = 0;
unsigned long __user *nm = NULL;
unsigned long nr_bits, alloc_size;
- DECLARE_BITMAP(bm, MAX_NUMNODES);
+ nodemask_t bm;
- nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES);
+ nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
if (nmask) {
- err = compat_get_bitmap(bm, nmask, nr_bits);
+ err = compat_get_bitmap(nodes_addr(bm), nmask, nr_bits);
nm = compat_alloc_user_space(alloc_size);
- err |= copy_to_user(nm, bm, alloc_size);
+ err |= copy_to_user(nm, &bm, alloc_size);
}
if (err)
return -EFAULT;
- return sys_set_mempolicy(mode, nm, nr_bits+1);
+ return sys_set_mempolicy(mode, nm, nr_bits + 1);
}
asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
@@ -649,26 +660,29 @@ asmlinkage long compat_sys_mbind(compat_
long err = 0;
unsigned long __user *nm = NULL;
unsigned long nr_bits, alloc_size;
- DECLARE_BITMAP(bm, MAX_NUMNODES);
+ nodemask_t bm;
- nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES);
+ nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
if (nmask) {
- err = compat_get_bitmap(bm, nmask, nr_bits);
+ err = compat_get_bitmap(nodes_addr(bm), nmask, nr_bits);
nm = compat_alloc_user_space(alloc_size);
- err |= copy_to_user(nm, bm, alloc_size);
+ err |= copy_to_user(nm, &bm, alloc_size);
}
if (err)
return -EFAULT;
- return sys_mbind(start, len, mode, nm, nr_bits+1, flags);
+ return sys_mbind(start, len, mode, nm, nr_bits + 1, flags);
}
#endif
-/* Return effective policy for a VMA */
+/*
+ * Return effective policy for a VMA
+ * Need to have mmap_sem held in order to access vma->policy
+ */
struct mempolicy *
get_vma_policy(struct task_struct *task, struct vm_area_struct *vma, unsigned long addr)
{
@@ -723,9 +737,9 @@ static unsigned interleave_nodes(struct
nid = me->il_next;
BUG_ON(nid >= MAX_NUMNODES);
- next = find_next_bit(policy->v.nodes, MAX_NUMNODES, 1+nid);
+ next = next_node(1 + nid, policy->v.nodes);
if (next >= MAX_NUMNODES)
- next = find_first_bit(policy->v.nodes, MAX_NUMNODES);
+ next = first_node(policy->v.nodes);
me->il_next = next;
return nid;
}
@@ -734,18 +748,18 @@ static unsigned interleave_nodes(struct
static unsigned offset_il_node(struct mempolicy *pol,
struct vm_area_struct *vma, unsigned long off)
{
- unsigned nnodes = bitmap_weight(pol->v.nodes, MAX_NUMNODES);
+ unsigned nnodes = nodes_weight(pol->v.nodes);
unsigned target = (unsigned)off % nnodes;
int c;
int nid = -1;
c = 0;
do {
- nid = find_next_bit(pol->v.nodes, MAX_NUMNODES, nid+1);
+ nid = next_node(nid + 1, pol->v.nodes);
c++;
} while (c <= target);
BUG_ON(nid >= MAX_NUMNODES);
- BUG_ON(!test_bit(nid, pol->v.nodes));
+ BUG_ON(!node_isset(nid, pol->v.nodes));
return nid;
}
@@ -878,7 +892,7 @@ int __mpol_equal(struct mempolicy *a, st
case MPOL_DEFAULT:
return 1;
case MPOL_INTERLEAVE:
- return bitmap_equal(a->v.nodes, b->v.nodes, MAX_NUMNODES);
+ return nodes_equal(a->v.nodes, b->v.nodes);
case MPOL_PREFERRED:
return a->v.preferred_node == b->v.preferred_node;
case MPOL_BIND: {
@@ -1028,7 +1042,7 @@ mpol_shared_policy_lookup(struct shared_
if (!sp->root.rb_node)
return NULL;
spin_lock(&sp->lock);
- sn = sp_lookup(sp, idx, idx+1);
+ sn = sp_lookup(sp, idx, idx + 1);
if (sn) {
mpol_get(sn->policy);
pol = sn->policy;
Index: linux-2.6.14-rc2/kernel/cpuset.c
===================================================================
--- linux-2.6.14-rc2.orig/kernel/cpuset.c 2005-09-19 20:00:41.000000000 -0700
+++ linux-2.6.14-rc2/kernel/cpuset.c 2005-09-23 11:08:38.000000000 -0700
@@ -1603,10 +1603,9 @@ void cpuset_update_current_mems_allowed(
* cpuset_restrict_to_mems_allowed - limit nodes to current mems_allowed
* @nodes: pointer to a node bitmap that is and-ed with mems_allowed
*/
-void cpuset_restrict_to_mems_allowed(unsigned long *nodes)
+void cpuset_restrict_to_mems_allowed(nodemask_t *nodes)
{
- bitmap_and(nodes, nodes, nodes_addr(current->mems_allowed),
- MAX_NUMNODES);
+ nodes_and(*nodes, *nodes, current->mems_allowed);
}
/**
Index: linux-2.6.14-rc2/include/linux/cpuset.h
===================================================================
--- linux-2.6.14-rc2.orig/include/linux/cpuset.h 2005-09-19 20:00:41.000000000 -0700
+++ linux-2.6.14-rc2/include/linux/cpuset.h 2005-09-23 11:08:38.000000000 -0700
@@ -21,7 +21,7 @@ extern void cpuset_exit(struct task_stru
extern cpumask_t cpuset_cpus_allowed(const struct task_struct *p);
void cpuset_init_current_mems_allowed(void);
void cpuset_update_current_mems_allowed(void);
-void cpuset_restrict_to_mems_allowed(unsigned long *nodes);
+void cpuset_restrict_to_mems_allowed(nodemask_t *nodes);
int cpuset_zonelist_valid_mems_allowed(struct zonelist *zl);
extern int cpuset_zone_allowed(struct zone *z, unsigned int __nocast gfp_mask);
extern int cpuset_excl_nodes_overlap(const struct task_struct *p);
@@ -42,7 +42,7 @@ static inline cpumask_t cpuset_cpus_allo
static inline void cpuset_init_current_mems_allowed(void) {}
static inline void cpuset_update_current_mems_allowed(void) {}
-static inline void cpuset_restrict_to_mems_allowed(unsigned long *nodes) {}
+static inline void cpuset_restrict_to_mems_allowed(nodemask_t *nodes) {}
static inline int cpuset_zonelist_valid_mems_allowed(struct zonelist *zl)
{
--
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^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH] Use node macros for memory policies
2005-09-23 18:10 [PATCH] Use node macros for memory policies Christoph Lameter
@ 2005-09-23 21:57 ` Andrew Morton
2005-09-24 18:22 ` Christoph Lameter
0 siblings, 1 reply; 4+ messages in thread
From: Andrew Morton @ 2005-09-23 21:57 UTC (permalink / raw)
To: Christoph Lameter; +Cc: ak, linux-mm
Christoph Lameter <clameter@engr.sgi.com> wrote:
>
> Use node macros for memory policies
>
> 1. Use node macros throughout instead of bitmaps
>
> 3. Blank fixes and clarifying comments.
There's already a patch in -mm which does this. There are differences, so
please review
ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.14-rc2/2.6.14-rc2-mm1/broken-out/convert-mempolicies-to-nodemask_t.patch
Which typedef weenie inflicted nodemask_t upon us anyway?
--
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] Use node macros for memory policies
2005-09-23 21:57 ` Andrew Morton
@ 2005-09-24 18:22 ` Christoph Lameter
2005-09-24 20:12 ` Paul Jackson
0 siblings, 1 reply; 4+ messages in thread
From: Christoph Lameter @ 2005-09-24 18:22 UTC (permalink / raw)
To: Andrew Morton; +Cc: ak, pj, linux-mm
On Fri, 23 Sep 2005, Andrew Morton wrote:
> There's already a patch in -mm which does this. There are differences,
> so please review
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.14-rc2/2.6.14-rc2-mm1/broken-out/convert-mempolicies-to-nodemask_t.patch
>
> Which typedef weenie inflicted nodemask_t upon us anyway?
Not me.
One hunk is missing in Andi's patchset. This covers the cpuset->mempolicy
interface.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Index: linux-2.6.14-rc2/kernel/cpuset.c
===================================================================
--- linux-2.6.14-rc2.orig/kernel/cpuset.c 2005-09-19 20:00:41.000000000 -0700
+++ linux-2.6.14-rc2/kernel/cpuset.c 2005-09-23 11:08:38.000000000 -0700
@@ -1603,10 +1603,9 @@ void cpuset_update_current_mems_allowed(
* cpuset_restrict_to_mems_allowed - limit nodes to current mems_allowed
* @nodes: pointer to a node bitmap that is and-ed with mems_allowed
*/
-void cpuset_restrict_to_mems_allowed(unsigned long *nodes)
+void cpuset_restrict_to_mems_allowed(nodemask_t *nodes)
{
- bitmap_and(nodes, nodes, nodes_addr(current->mems_allowed),
- MAX_NUMNODES);
+ nodes_and(*nodes, *nodes, current->mems_allowed);
}
/**
Index: linux-2.6.14-rc2/include/linux/cpuset.h
===================================================================
--- linux-2.6.14-rc2.orig/include/linux/cpuset.h 2005-09-19 20:00:41.000000000 -0700
+++ linux-2.6.14-rc2/include/linux/cpuset.h 2005-09-23 11:08:38.000000000 -0700
@@ -21,7 +21,7 @@ extern void cpuset_exit(struct task_stru
extern cpumask_t cpuset_cpus_allowed(const struct task_struct *p);
void cpuset_init_current_mems_allowed(void);
void cpuset_update_current_mems_allowed(void);
-void cpuset_restrict_to_mems_allowed(unsigned long *nodes);
+void cpuset_restrict_to_mems_allowed(nodemask_t *nodes);
int cpuset_zonelist_valid_mems_allowed(struct zonelist *zl);
extern int cpuset_zone_allowed(struct zone *z, unsigned int __nocast gfp_mask);
extern int cpuset_excl_nodes_overlap(const struct task_struct *p);
@@ -42,7 +42,7 @@ static inline cpumask_t cpuset_cpus_allo
static inline void cpuset_init_current_mems_allowed(void) {}
static inline void cpuset_update_current_mems_allowed(void) {}
-static inline void cpuset_restrict_to_mems_allowed(unsigned long *nodes) {}
+static inline void cpuset_restrict_to_mems_allowed(nodemask_t *nodes) {}
static inline int cpuset_zonelist_valid_mems_allowed(struct zonelist *zl)
{
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^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH] Use node macros for memory policies
2005-09-24 18:22 ` Christoph Lameter
@ 2005-09-24 20:12 ` Paul Jackson
0 siblings, 0 replies; 4+ messages in thread
From: Paul Jackson @ 2005-09-24 20:12 UTC (permalink / raw)
To: Christoph Lameter; +Cc: akpm, ak, linux-mm
Andrew inquired:
> Which typedef weenie inflicted nodemask_t upon us anyway?
I believe it was Matthew Dobson and myself, with forced labor
contributions from several others, as part of a larger effort
to overhaul bitmaps and cpumasks.
Christoph wrote:
> One hunk is missing in Andi's patchset. This covers the cpuset->mempolicy
> interface.
If you had taken a look at the lkml thread where Andi submitted his
patch to convert mempolicy to nodemask, and I reviewed it, we agreed to
send in the remaining couple of pieces after Andi's patch had worked
its way through the system, to avoid wasting the couple of minutes of
Andrews time that it would take him to deal with possible merge
conflicts.
I don't see where your patch deals with the following two lines, at the
point in mm/mempolicy.c where cpuset_restrict_to_mems_allowed is called
(the latest *-mm version with Andi's patch nodemask mempolicy patch):
/* AK: shouldn't this error out instead? */
cpuset_restrict_to_mems_allowed(nodes_addr(*nodes));
I agreed with Andi that this should error out, and I accepted his
suggestion that I fix this, later on.
Surely it is not a good idea to change the type of parameter a function
accepts, without changing the places that call that function.
--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <pj@sgi.com> 1.925.600.0401
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^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2005-09-24 20:12 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2005-09-23 18:10 [PATCH] Use node macros for memory policies Christoph Lameter
2005-09-23 21:57 ` Andrew Morton
2005-09-24 18:22 ` Christoph Lameter
2005-09-24 20:12 ` Paul Jackson
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