Commit d00bcc98 authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds
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[PATCH] Extract the allocpercpu functions from the slab allocator



The allocpercpu functions __alloc_percpu and __free_percpu() are heavily
using the slab allocator.  However, they are conceptually slab.  This also
simplifies SLOB (at this point slob may be broken in mm.  This should fix
it).
Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
Cc: Matt Mackall <mpm@selenic.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 39bbcb8f
......@@ -23,4 +23,4 @@ obj-$(CONFIG_SLAB) += slab.o
obj-$(CONFIG_MEMORY_HOTPLUG) += memory_hotplug.o
obj-$(CONFIG_FS_XIP) += filemap_xip.o
obj-$(CONFIG_MIGRATION) += migrate.o
obj-$(CONFIG_SMP) += allocpercpu.o
/*
* linux/mm/allocpercpu.c
*
* Separated from slab.c August 11, 2006 Christoph Lameter <clameter@sgi.com>
*/
#include <linux/mm.h>
#include <linux/module.h>
/**
* percpu_depopulate - depopulate per-cpu data for given cpu
* @__pdata: per-cpu data to depopulate
* @cpu: depopulate per-cpu data for this cpu
*
* Depopulating per-cpu data for a cpu going offline would be a typical
* use case. You need to register a cpu hotplug handler for that purpose.
*/
void percpu_depopulate(void *__pdata, int cpu)
{
struct percpu_data *pdata = __percpu_disguise(__pdata);
if (pdata->ptrs[cpu]) {
kfree(pdata->ptrs[cpu]);
pdata->ptrs[cpu] = NULL;
}
}
EXPORT_SYMBOL_GPL(percpu_depopulate);
/**
* percpu_depopulate_mask - depopulate per-cpu data for some cpu's
* @__pdata: per-cpu data to depopulate
* @mask: depopulate per-cpu data for cpu's selected through mask bits
*/
void __percpu_depopulate_mask(void *__pdata, cpumask_t *mask)
{
int cpu;
for_each_cpu_mask(cpu, *mask)
percpu_depopulate(__pdata, cpu);
}
EXPORT_SYMBOL_GPL(__percpu_depopulate_mask);
/**
* percpu_populate - populate per-cpu data for given cpu
* @__pdata: per-cpu data to populate further
* @size: size of per-cpu object
* @gfp: may sleep or not etc.
* @cpu: populate per-data for this cpu
*
* Populating per-cpu data for a cpu coming online would be a typical
* use case. You need to register a cpu hotplug handler for that purpose.
* Per-cpu object is populated with zeroed buffer.
*/
void *percpu_populate(void *__pdata, size_t size, gfp_t gfp, int cpu)
{
struct percpu_data *pdata = __percpu_disguise(__pdata);
int node = cpu_to_node(cpu);
BUG_ON(pdata->ptrs[cpu]);
if (node_online(node)) {
/* FIXME: kzalloc_node(size, gfp, node) */
pdata->ptrs[cpu] = kmalloc_node(size, gfp, node);
if (pdata->ptrs[cpu])
memset(pdata->ptrs[cpu], 0, size);
} else
pdata->ptrs[cpu] = kzalloc(size, gfp);
return pdata->ptrs[cpu];
}
EXPORT_SYMBOL_GPL(percpu_populate);
/**
* percpu_populate_mask - populate per-cpu data for more cpu's
* @__pdata: per-cpu data to populate further
* @size: size of per-cpu object
* @gfp: may sleep or not etc.
* @mask: populate per-cpu data for cpu's selected through mask bits
*
* Per-cpu objects are populated with zeroed buffers.
*/
int __percpu_populate_mask(void *__pdata, size_t size, gfp_t gfp,
cpumask_t *mask)
{
cpumask_t populated = CPU_MASK_NONE;
int cpu;
for_each_cpu_mask(cpu, *mask)
if (unlikely(!percpu_populate(__pdata, size, gfp, cpu))) {
__percpu_depopulate_mask(__pdata, &populated);
return -ENOMEM;
} else
cpu_set(cpu, populated);
return 0;
}
EXPORT_SYMBOL_GPL(__percpu_populate_mask);
/**
* percpu_alloc_mask - initial setup of per-cpu data
* @size: size of per-cpu object
* @gfp: may sleep or not etc.
* @mask: populate per-data for cpu's selected through mask bits
*
* Populating per-cpu data for all online cpu's would be a typical use case,
* which is simplified by the percpu_alloc() wrapper.
* Per-cpu objects are populated with zeroed buffers.
*/
void *__percpu_alloc_mask(size_t size, gfp_t gfp, cpumask_t *mask)
{
void *pdata = kzalloc(sizeof(struct percpu_data), gfp);
void *__pdata = __percpu_disguise(pdata);
if (unlikely(!pdata))
return NULL;
if (likely(!__percpu_populate_mask(__pdata, size, gfp, mask)))
return __pdata;
kfree(pdata);
return NULL;
}
EXPORT_SYMBOL_GPL(__percpu_alloc_mask);
/**
* percpu_free - final cleanup of per-cpu data
* @__pdata: object to clean up
*
* We simply clean up any per-cpu object left. No need for the client to
* track and specify through a bis mask which per-cpu objects are to free.
*/
void percpu_free(void *__pdata)
{
__percpu_depopulate_mask(__pdata, &cpu_possible_map);
kfree(__percpu_disguise(__pdata));
}
EXPORT_SYMBOL_GPL(percpu_free);
......@@ -3440,130 +3440,6 @@ void *__kmalloc_track_caller(size_t size, gfp_t flags, void *caller)
EXPORT_SYMBOL(__kmalloc_track_caller);
#endif
#ifdef CONFIG_SMP
/**
* percpu_depopulate - depopulate per-cpu data for given cpu
* @__pdata: per-cpu data to depopulate
* @cpu: depopulate per-cpu data for this cpu
*
* Depopulating per-cpu data for a cpu going offline would be a typical
* use case. You need to register a cpu hotplug handler for that purpose.
*/
void percpu_depopulate(void *__pdata, int cpu)
{
struct percpu_data *pdata = __percpu_disguise(__pdata);
if (pdata->ptrs[cpu]) {
kfree(pdata->ptrs[cpu]);
pdata->ptrs[cpu] = NULL;
}
}
EXPORT_SYMBOL_GPL(percpu_depopulate);
/**
* percpu_depopulate_mask - depopulate per-cpu data for some cpu's
* @__pdata: per-cpu data to depopulate
* @mask: depopulate per-cpu data for cpu's selected through mask bits
*/
void __percpu_depopulate_mask(void *__pdata, cpumask_t *mask)
{
int cpu;
for_each_cpu_mask(cpu, *mask)
percpu_depopulate(__pdata, cpu);
}
EXPORT_SYMBOL_GPL(__percpu_depopulate_mask);
/**
* percpu_populate - populate per-cpu data for given cpu
* @__pdata: per-cpu data to populate further
* @size: size of per-cpu object
* @gfp: may sleep or not etc.
* @cpu: populate per-data for this cpu
*
* Populating per-cpu data for a cpu coming online would be a typical
* use case. You need to register a cpu hotplug handler for that purpose.
* Per-cpu object is populated with zeroed buffer.
*/
void *percpu_populate(void *__pdata, size_t size, gfp_t gfp, int cpu)
{
struct percpu_data *pdata = __percpu_disguise(__pdata);
int node = cpu_to_node(cpu);
BUG_ON(pdata->ptrs[cpu]);
if (node_online(node)) {
/* FIXME: kzalloc_node(size, gfp, node) */
pdata->ptrs[cpu] = kmalloc_node(size, gfp, node);
if (pdata->ptrs[cpu])
memset(pdata->ptrs[cpu], 0, size);
} else
pdata->ptrs[cpu] = kzalloc(size, gfp);
return pdata->ptrs[cpu];
}
EXPORT_SYMBOL_GPL(percpu_populate);
/**
* percpu_populate_mask - populate per-cpu data for more cpu's
* @__pdata: per-cpu data to populate further
* @size: size of per-cpu object
* @gfp: may sleep or not etc.
* @mask: populate per-cpu data for cpu's selected through mask bits
*
* Per-cpu objects are populated with zeroed buffers.
*/
int __percpu_populate_mask(void *__pdata, size_t size, gfp_t gfp,
cpumask_t *mask)
{
cpumask_t populated = CPU_MASK_NONE;
int cpu;
for_each_cpu_mask(cpu, *mask)
if (unlikely(!percpu_populate(__pdata, size, gfp, cpu))) {
__percpu_depopulate_mask(__pdata, &populated);
return -ENOMEM;
} else
cpu_set(cpu, populated);
return 0;
}
EXPORT_SYMBOL_GPL(__percpu_populate_mask);
/**
* percpu_alloc_mask - initial setup of per-cpu data
* @size: size of per-cpu object
* @gfp: may sleep or not etc.
* @mask: populate per-data for cpu's selected through mask bits
*
* Populating per-cpu data for all online cpu's would be a typical use case,
* which is simplified by the percpu_alloc() wrapper.
* Per-cpu objects are populated with zeroed buffers.
*/
void *__percpu_alloc_mask(size_t size, gfp_t gfp, cpumask_t *mask)
{
void *pdata = kzalloc(sizeof(struct percpu_data), gfp);
void *__pdata = __percpu_disguise(pdata);
if (unlikely(!pdata))
return NULL;
if (likely(!__percpu_populate_mask(__pdata, size, gfp, mask)))
return __pdata;
kfree(pdata);
return NULL;
}
EXPORT_SYMBOL_GPL(__percpu_alloc_mask);
/**
* percpu_free - final cleanup of per-cpu data
* @__pdata: object to clean up
*
* We simply clean up any per-cpu object left. No need for the client to
* track and specify through a bis mask which per-cpu objects are to free.
*/
void percpu_free(void *__pdata)
{
__percpu_depopulate_mask(__pdata, &cpu_possible_map);
kfree(__percpu_disguise(__pdata));
}
EXPORT_SYMBOL_GPL(percpu_free);
#endif /* CONFIG_SMP */
/**
* kmem_cache_free - Deallocate an object
* @cachep: The cache the allocation was from.
......
......@@ -343,48 +343,3 @@ void kmem_cache_init(void)
atomic_t slab_reclaim_pages = ATOMIC_INIT(0);
EXPORT_SYMBOL(slab_reclaim_pages);
#ifdef CONFIG_SMP
void *__alloc_percpu(size_t size)
{
int i;
struct percpu_data *pdata = kmalloc(sizeof (*pdata), GFP_KERNEL);
if (!pdata)
return NULL;
for_each_possible_cpu(i) {
pdata->ptrs[i] = kmalloc(size, GFP_KERNEL);
if (!pdata->ptrs[i])
goto unwind_oom;
memset(pdata->ptrs[i], 0, size);
}
/* Catch derefs w/o wrappers */
return (void *) (~(unsigned long) pdata);
unwind_oom:
while (--i >= 0) {
if (!cpu_possible(i))
continue;
kfree(pdata->ptrs[i]);
}
kfree(pdata);
return NULL;
}
EXPORT_SYMBOL(__alloc_percpu);
void
free_percpu(const void *objp)
{
int i;
struct percpu_data *p = (struct percpu_data *) (~(unsigned long) objp);
for_each_possible_cpu(i)
kfree(p->ptrs[i]);
kfree(p);
}
EXPORT_SYMBOL(free_percpu);
#endif
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