mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 09:16:44 +07:00
d00bcc98d7
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: Christoph Lameter <clameter@sgi.com> Cc: Matt Mackall <mpm@selenic.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
130 lines
3.7 KiB
C
130 lines
3.7 KiB
C
/*
|
|
* 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);
|