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Subject[PATCH 06/10] x86: reduce memory and stack usage in intel_cacheinfo
* Change the following static arrays sized by NR_CPUS to
per_cpu data variables:

_cpuid4_info *cpuid4_info[NR_CPUS];
_index_kobject *index_kobject[NR_CPUS];
kobject * cache_kobject[NR_CPUS];

* Remove the local NR_CPUS array with a kmalloc'd region in
show_shared_cpu_map().

Also some minor complaints from checkpatch.pl fixed.

Based on:
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86.git

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Andi Kleen <ak@suse.de>

Signed-off-by: Mike Travis <travis@sgi.com>
---
arch/x86/kernel/cpu/intel_cacheinfo.c | 70 +++++++++++++++++++---------------
1 file changed, 40 insertions(+), 30 deletions(-)
--- linux.trees.git.orig/arch/x86/kernel/cpu/intel_cacheinfo.c
+++ linux.trees.git/arch/x86/kernel/cpu/intel_cacheinfo.c
@@ -129,7 +129,7 @@ struct _cpuid4_info {
union _cpuid4_leaf_ebx ebx;
union _cpuid4_leaf_ecx ecx;
unsigned long size;
- cpumask_t shared_cpu_map;
+ cpumask_t shared_cpu_map; /* future?: only cpus/node is needed */
};

unsigned short num_cache_leaves;
@@ -451,8 +451,8 @@ unsigned int __cpuinit init_intel_cachei
}

/* pointer to _cpuid4_info array (for each cache leaf) */
-static struct _cpuid4_info *cpuid4_info[NR_CPUS];
-#define CPUID4_INFO_IDX(x,y) (&((cpuid4_info[x])[y]))
+static DEFINE_PER_CPU(struct _cpuid4_info *, cpuid4_info);
+#define CPUID4_INFO_IDX(x, y) (&((per_cpu(cpuid4_info, x))[y]))

#ifdef CONFIG_SMP
static void __cpuinit cache_shared_cpu_map_setup(unsigned int cpu, int index)
@@ -474,7 +474,7 @@ static void __cpuinit cache_shared_cpu_m
if (cpu_data(i).apicid >> index_msb ==
c->apicid >> index_msb) {
cpu_set(i, this_leaf->shared_cpu_map);
- if (i != cpu && cpuid4_info[i]) {
+ if (i != cpu && per_cpu(cpuid4_info, i)) {
sibling_leaf = CPUID4_INFO_IDX(i, index);
cpu_set(cpu, sibling_leaf->shared_cpu_map);
}
@@ -505,8 +505,8 @@ static void __cpuinit free_cache_attribu
for (i = 0; i < num_cache_leaves; i++)
cache_remove_shared_cpu_map(cpu, i);

- kfree(cpuid4_info[cpu]);
- cpuid4_info[cpu] = NULL;
+ kfree(per_cpu(cpuid4_info, cpu));
+ per_cpu(cpuid4_info, cpu) = NULL;
}

static int __cpuinit detect_cache_attributes(unsigned int cpu)
@@ -519,9 +519,9 @@ static int __cpuinit detect_cache_attrib
if (num_cache_leaves == 0)
return -ENOENT;

- cpuid4_info[cpu] = kzalloc(
+ per_cpu(cpuid4_info, cpu) = kzalloc(
sizeof(struct _cpuid4_info) * num_cache_leaves, GFP_KERNEL);
- if (cpuid4_info[cpu] == NULL)
+ if (per_cpu(cpuid4_info, cpu) == NULL)
return -ENOMEM;

oldmask = current->cpus_allowed;
@@ -546,8 +546,8 @@ static int __cpuinit detect_cache_attrib

out:
if (retval) {
- kfree(cpuid4_info[cpu]);
- cpuid4_info[cpu] = NULL;
+ kfree(per_cpu(cpuid4_info, cpu));
+ per_cpu(cpuid4_info, cpu) = NULL;
}

return retval;
@@ -561,7 +561,7 @@ out:
extern struct sysdev_class cpu_sysdev_class; /* from drivers/base/cpu.c */

/* pointer to kobject for cpuX/cache */
-static struct kobject * cache_kobject[NR_CPUS];
+static DEFINE_PER_CPU(struct kobject *, cache_kobject);

struct _index_kobject {
struct kobject kobj;
@@ -570,8 +570,8 @@ struct _index_kobject {
};

/* pointer to array of kobjects for cpuX/cache/indexY */
-static struct _index_kobject *index_kobject[NR_CPUS];
-#define INDEX_KOBJECT_PTR(x,y) (&((index_kobject[x])[y]))
+static DEFINE_PER_CPU(struct _index_kobject *, index_kobject);
+#define INDEX_KOBJECT_PTR(x, y) (&((per_cpu(index_kobject, x))[y]))

#define show_one_plus(file_name, object, val) \
static ssize_t show_##file_name \
@@ -593,9 +593,16 @@ static ssize_t show_size(struct _cpuid4_

static ssize_t show_shared_cpu_map(struct _cpuid4_info *this_leaf, char *buf)
{
- char mask_str[NR_CPUS];
- cpumask_scnprintf(mask_str, NR_CPUS, this_leaf->shared_cpu_map);
- return sprintf(buf, "%s\n", mask_str);
+ int n = 0;
+ int len = cpumask_scnprintf_len(nr_cpu_ids);
+ char *mask_str = kmalloc(len, GFP_KERNEL);
+
+ if (mask_str) {
+ cpumask_scnprintf(mask_str, len, this_leaf->shared_cpu_map);
+ n = sprintf(buf, "%s\n", mask_str);
+ kfree(mask_str);
+ }
+ return n;
}

static ssize_t show_type(struct _cpuid4_info *this_leaf, char *buf) {
@@ -684,10 +691,10 @@ static struct kobj_type ktype_percpu_ent

static void __cpuinit cpuid4_cache_sysfs_exit(unsigned int cpu)
{
- kfree(cache_kobject[cpu]);
- kfree(index_kobject[cpu]);
- cache_kobject[cpu] = NULL;
- index_kobject[cpu] = NULL;
+ kfree(per_cpu(cache_kobject, cpu));
+ kfree(per_cpu(index_kobject, cpu));
+ per_cpu(cache_kobject, cpu) = NULL;
+ per_cpu(index_kobject, cpu) = NULL;
free_cache_attributes(cpu);
}

@@ -703,13 +710,14 @@ static int __cpuinit cpuid4_cache_sysfs_
return err;

/* Allocate all required memory */
- cache_kobject[cpu] = kzalloc(sizeof(struct kobject), GFP_KERNEL);
- if (unlikely(cache_kobject[cpu] == NULL))
+ per_cpu(cache_kobject, cpu) =
+ kzalloc(sizeof(struct kobject), GFP_KERNEL);
+ if (unlikely(per_cpu(cache_kobject, cpu) == NULL))
goto err_out;

- index_kobject[cpu] = kzalloc(
+ per_cpu(index_kobject, cpu) = kzalloc(
sizeof(struct _index_kobject ) * num_cache_leaves, GFP_KERNEL);
- if (unlikely(index_kobject[cpu] == NULL))
+ if (unlikely(per_cpu(index_kobject, cpu) == NULL))
goto err_out;

return 0;
@@ -733,7 +741,8 @@ static int __cpuinit cache_add_dev(struc
if (unlikely(retval < 0))
return retval;

- retval = kobject_init_and_add(cache_kobject[cpu], &ktype_percpu_entry,
+ retval = kobject_init_and_add(per_cpu(cache_kobject, cpu),
+ &ktype_percpu_entry,
&sys_dev->kobj, "%s", "cache");
if (retval < 0) {
cpuid4_cache_sysfs_exit(cpu);
@@ -745,13 +754,14 @@ static int __cpuinit cache_add_dev(struc
this_object->cpu = cpu;
this_object->index = i;
retval = kobject_init_and_add(&(this_object->kobj),
- &ktype_cache, cache_kobject[cpu],
+ &ktype_cache,
+ per_cpu(cache_kobject, cpu),
"index%1lu", i);
if (unlikely(retval)) {
for (j = 0; j < i; j++) {
kobject_put(&(INDEX_KOBJECT_PTR(cpu,j)->kobj));
}
- kobject_put(cache_kobject[cpu]);
+ kobject_put(per_cpu(cache_kobject, cpu));
cpuid4_cache_sysfs_exit(cpu);
break;
}
@@ -760,7 +770,7 @@ static int __cpuinit cache_add_dev(struc
if (!retval)
cpu_set(cpu, cache_dev_map);

- kobject_uevent(cache_kobject[cpu], KOBJ_ADD);
+ kobject_uevent(per_cpu(cache_kobject, cpu), KOBJ_ADD);
return retval;
}

@@ -769,7 +779,7 @@ static void __cpuinit cache_remove_dev(s
unsigned int cpu = sys_dev->id;
unsigned long i;

- if (cpuid4_info[cpu] == NULL)
+ if (per_cpu(cpuid4_info, cpu) == NULL)
return;
if (!cpu_isset(cpu, cache_dev_map))
return;
@@ -777,7 +787,7 @@ static void __cpuinit cache_remove_dev(s

for (i = 0; i < num_cache_leaves; i++)
kobject_put(&(INDEX_KOBJECT_PTR(cpu,i)->kobj));
- kobject_put(cache_kobject[cpu]);
+ kobject_put(per_cpu(cache_kobject, cpu));
cpuid4_cache_sysfs_exit(cpu);
}

--


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