forked from luck/tmp_suning_uos_patched
percpu: kill legacy percpu allocator
With ia64 converted, there's no arch left which still uses legacy percpu allocator. Kill it. Signed-off-by: Tejun Heo <tj@kernel.org> Delightedly-acked-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Ingo Molnar <mingo@redhat.com> Cc: Christoph Lameter <cl@linux-foundation.org>
This commit is contained in:
Tejun Heo
parent
52594762a3
commit
23fb064bb9
|
|
@ -34,8 +34,6 @@
|
|||
|
||||
#ifdef CONFIG_SMP
|
||||
|
||||
#ifndef CONFIG_HAVE_LEGACY_PER_CPU_AREA
|
||||
|
||||
/* minimum unit size, also is the maximum supported allocation size */
|
||||
#define PCPU_MIN_UNIT_SIZE PFN_ALIGN(64 << 10)
|
||||
|
||||
|
|
@ -130,28 +128,6 @@ extern int __init pcpu_page_first_chunk(size_t reserved_size,
|
|||
#define per_cpu_ptr(ptr, cpu) SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu)))
|
||||
|
||||
extern void *__alloc_reserved_percpu(size_t size, size_t align);
|
||||
|
||||
#else /* CONFIG_HAVE_LEGACY_PER_CPU_AREA */
|
||||
|
||||
struct percpu_data {
|
||||
void *ptrs[1];
|
||||
};
|
||||
|
||||
/* pointer disguising messes up the kmemleak objects tracking */
|
||||
#ifndef CONFIG_DEBUG_KMEMLEAK
|
||||
#define __percpu_disguise(pdata) (struct percpu_data *)~(unsigned long)(pdata)
|
||||
#else
|
||||
#define __percpu_disguise(pdata) (struct percpu_data *)(pdata)
|
||||
#endif
|
||||
|
||||
#define per_cpu_ptr(ptr, cpu) \
|
||||
({ \
|
||||
struct percpu_data *__p = __percpu_disguise(ptr); \
|
||||
(__typeof__(ptr))__p->ptrs[(cpu)]; \
|
||||
})
|
||||
|
||||
#endif /* CONFIG_HAVE_LEGACY_PER_CPU_AREA */
|
||||
|
||||
extern void *__alloc_percpu(size_t size, size_t align);
|
||||
extern void free_percpu(void *__pdata);
|
||||
|
||||
|
|
|
|||
150
kernel/module.c
150
kernel/module.c
|
|
@ -370,8 +370,6 @@ EXPORT_SYMBOL_GPL(find_module);
|
|||
|
||||
#ifdef CONFIG_SMP
|
||||
|
||||
#ifndef CONFIG_HAVE_LEGACY_PER_CPU_AREA
|
||||
|
||||
static void *percpu_modalloc(unsigned long size, unsigned long align,
|
||||
const char *name)
|
||||
{
|
||||
|
|
@ -395,154 +393,6 @@ static void percpu_modfree(void *freeme)
|
|||
free_percpu(freeme);
|
||||
}
|
||||
|
||||
#else /* ... CONFIG_HAVE_LEGACY_PER_CPU_AREA */
|
||||
|
||||
/* Number of blocks used and allocated. */
|
||||
static unsigned int pcpu_num_used, pcpu_num_allocated;
|
||||
/* Size of each block. -ve means used. */
|
||||
static int *pcpu_size;
|
||||
|
||||
static int split_block(unsigned int i, unsigned short size)
|
||||
{
|
||||
/* Reallocation required? */
|
||||
if (pcpu_num_used + 1 > pcpu_num_allocated) {
|
||||
int *new;
|
||||
|
||||
new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2,
|
||||
GFP_KERNEL);
|
||||
if (!new)
|
||||
return 0;
|
||||
|
||||
pcpu_num_allocated *= 2;
|
||||
pcpu_size = new;
|
||||
}
|
||||
|
||||
/* Insert a new subblock */
|
||||
memmove(&pcpu_size[i+1], &pcpu_size[i],
|
||||
sizeof(pcpu_size[0]) * (pcpu_num_used - i));
|
||||
pcpu_num_used++;
|
||||
|
||||
pcpu_size[i+1] -= size;
|
||||
pcpu_size[i] = size;
|
||||
return 1;
|
||||
}
|
||||
|
||||
static inline unsigned int block_size(int val)
|
||||
{
|
||||
if (val < 0)
|
||||
return -val;
|
||||
return val;
|
||||
}
|
||||
|
||||
static void *percpu_modalloc(unsigned long size, unsigned long align,
|
||||
const char *name)
|
||||
{
|
||||
unsigned long extra;
|
||||
unsigned int i;
|
||||
void *ptr;
|
||||
int cpu;
|
||||
|
||||
if (align > PAGE_SIZE) {
|
||||
printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
|
||||
name, align, PAGE_SIZE);
|
||||
align = PAGE_SIZE;
|
||||
}
|
||||
|
||||
ptr = __per_cpu_start;
|
||||
for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
|
||||
/* Extra for alignment requirement. */
|
||||
extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr;
|
||||
BUG_ON(i == 0 && extra != 0);
|
||||
|
||||
if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size)
|
||||
continue;
|
||||
|
||||
/* Transfer extra to previous block. */
|
||||
if (pcpu_size[i-1] < 0)
|
||||
pcpu_size[i-1] -= extra;
|
||||
else
|
||||
pcpu_size[i-1] += extra;
|
||||
pcpu_size[i] -= extra;
|
||||
ptr += extra;
|
||||
|
||||
/* Split block if warranted */
|
||||
if (pcpu_size[i] - size > sizeof(unsigned long))
|
||||
if (!split_block(i, size))
|
||||
return NULL;
|
||||
|
||||
/* add the per-cpu scanning areas */
|
||||
for_each_possible_cpu(cpu)
|
||||
kmemleak_alloc(ptr + per_cpu_offset(cpu), size, 0,
|
||||
GFP_KERNEL);
|
||||
|
||||
/* Mark allocated */
|
||||
pcpu_size[i] = -pcpu_size[i];
|
||||
return ptr;
|
||||
}
|
||||
|
||||
printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n",
|
||||
size);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static void percpu_modfree(void *freeme)
|
||||
{
|
||||
unsigned int i;
|
||||
void *ptr = __per_cpu_start + block_size(pcpu_size[0]);
|
||||
int cpu;
|
||||
|
||||
/* First entry is core kernel percpu data. */
|
||||
for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
|
||||
if (ptr == freeme) {
|
||||
pcpu_size[i] = -pcpu_size[i];
|
||||
goto free;
|
||||
}
|
||||
}
|
||||
BUG();
|
||||
|
||||
free:
|
||||
/* remove the per-cpu scanning areas */
|
||||
for_each_possible_cpu(cpu)
|
||||
kmemleak_free(freeme + per_cpu_offset(cpu));
|
||||
|
||||
/* Merge with previous? */
|
||||
if (pcpu_size[i-1] >= 0) {
|
||||
pcpu_size[i-1] += pcpu_size[i];
|
||||
pcpu_num_used--;
|
||||
memmove(&pcpu_size[i], &pcpu_size[i+1],
|
||||
(pcpu_num_used - i) * sizeof(pcpu_size[0]));
|
||||
i--;
|
||||
}
|
||||
/* Merge with next? */
|
||||
if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) {
|
||||
pcpu_size[i] += pcpu_size[i+1];
|
||||
pcpu_num_used--;
|
||||
memmove(&pcpu_size[i+1], &pcpu_size[i+2],
|
||||
(pcpu_num_used - (i+1)) * sizeof(pcpu_size[0]));
|
||||
}
|
||||
}
|
||||
|
||||
static int percpu_modinit(void)
|
||||
{
|
||||
pcpu_num_used = 2;
|
||||
pcpu_num_allocated = 2;
|
||||
pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated,
|
||||
GFP_KERNEL);
|
||||
/* Static in-kernel percpu data (used). */
|
||||
pcpu_size[0] = -(__per_cpu_end-__per_cpu_start);
|
||||
/* Free room. */
|
||||
pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0];
|
||||
if (pcpu_size[1] < 0) {
|
||||
printk(KERN_ERR "No per-cpu room for modules.\n");
|
||||
pcpu_num_used = 1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
__initcall(percpu_modinit);
|
||||
|
||||
#endif /* CONFIG_HAVE_LEGACY_PER_CPU_AREA */
|
||||
|
||||
static unsigned int find_pcpusec(Elf_Ehdr *hdr,
|
||||
Elf_Shdr *sechdrs,
|
||||
const char *secstrings)
|
||||
|
|
|
|||
|
|
@ -34,11 +34,7 @@ obj-$(CONFIG_FAILSLAB) += failslab.o
|
|||
obj-$(CONFIG_MEMORY_HOTPLUG) += memory_hotplug.o
|
||||
obj-$(CONFIG_FS_XIP) += filemap_xip.o
|
||||
obj-$(CONFIG_MIGRATION) += migrate.o
|
||||
ifndef CONFIG_HAVE_LEGACY_PER_CPU_AREA
|
||||
obj-$(CONFIG_SMP) += percpu.o
|
||||
else
|
||||
obj-$(CONFIG_SMP) += allocpercpu.o
|
||||
endif
|
||||
obj-$(CONFIG_QUICKLIST) += quicklist.o
|
||||
obj-$(CONFIG_CGROUP_MEM_RES_CTLR) += memcontrol.o page_cgroup.o
|
||||
obj-$(CONFIG_MEMORY_FAILURE) += memory-failure.o
|
||||
|
|
|
|||
177
mm/allocpercpu.c
177
mm/allocpercpu.c
|
|
@ -1,177 +0,0 @@
|
|||
/*
|
||||
* linux/mm/allocpercpu.c
|
||||
*
|
||||
* Separated from slab.c August 11, 2006 Christoph Lameter
|
||||
*/
|
||||
#include <linux/mm.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/bootmem.h>
|
||||
#include <asm/sections.h>
|
||||
|
||||
#ifndef cache_line_size
|
||||
#define cache_line_size() L1_CACHE_BYTES
|
||||
#endif
|
||||
|
||||
/**
|
||||
* 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.
|
||||
*/
|
||||
static void percpu_depopulate(void *__pdata, int cpu)
|
||||
{
|
||||
struct percpu_data *pdata = __percpu_disguise(__pdata);
|
||||
|
||||
kfree(pdata->ptrs[cpu]);
|
||||
pdata->ptrs[cpu] = NULL;
|
||||
}
|
||||
|
||||
/**
|
||||
* 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
|
||||
*/
|
||||
static void __percpu_depopulate_mask(void *__pdata, const cpumask_t *mask)
|
||||
{
|
||||
int cpu;
|
||||
for_each_cpu_mask_nr(cpu, *mask)
|
||||
percpu_depopulate(__pdata, cpu);
|
||||
}
|
||||
|
||||
#define percpu_depopulate_mask(__pdata, mask) \
|
||||
__percpu_depopulate_mask((__pdata), &(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.
|
||||
*/
|
||||
static 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);
|
||||
|
||||
/*
|
||||
* We should make sure each CPU gets private memory.
|
||||
*/
|
||||
size = roundup(size, cache_line_size());
|
||||
|
||||
BUG_ON(pdata->ptrs[cpu]);
|
||||
if (node_online(node))
|
||||
pdata->ptrs[cpu] = kmalloc_node(size, gfp|__GFP_ZERO, node);
|
||||
else
|
||||
pdata->ptrs[cpu] = kzalloc(size, gfp);
|
||||
return pdata->ptrs[cpu];
|
||||
}
|
||||
|
||||
/**
|
||||
* 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.
|
||||
*/
|
||||
static int __percpu_populate_mask(void *__pdata, size_t size, gfp_t gfp,
|
||||
cpumask_t *mask)
|
||||
{
|
||||
cpumask_t populated;
|
||||
int cpu;
|
||||
|
||||
cpus_clear(populated);
|
||||
for_each_cpu_mask_nr(cpu, *mask)
|
||||
if (unlikely(!percpu_populate(__pdata, size, gfp, cpu))) {
|
||||
__percpu_depopulate_mask(__pdata, &populated);
|
||||
return -ENOMEM;
|
||||
} else
|
||||
cpu_set(cpu, populated);
|
||||
return 0;
|
||||
}
|
||||
|
||||
#define percpu_populate_mask(__pdata, size, gfp, mask) \
|
||||
__percpu_populate_mask((__pdata), (size), (gfp), &(mask))
|
||||
|
||||
/**
|
||||
* alloc_percpu - initial setup of per-cpu data
|
||||
* @size: size of per-cpu object
|
||||
* @align: alignment
|
||||
*
|
||||
* Allocate dynamic percpu area. Percpu objects are populated with
|
||||
* zeroed buffers.
|
||||
*/
|
||||
void *__alloc_percpu(size_t size, size_t align)
|
||||
{
|
||||
/*
|
||||
* We allocate whole cache lines to avoid false sharing
|
||||
*/
|
||||
size_t sz = roundup(nr_cpu_ids * sizeof(void *), cache_line_size());
|
||||
void *pdata = kzalloc(sz, GFP_KERNEL);
|
||||
void *__pdata = __percpu_disguise(pdata);
|
||||
|
||||
/*
|
||||
* Can't easily make larger alignment work with kmalloc. WARN
|
||||
* on it. Larger alignment should only be used for module
|
||||
* percpu sections on SMP for which this path isn't used.
|
||||
*/
|
||||
WARN_ON_ONCE(align > SMP_CACHE_BYTES);
|
||||
|
||||
if (unlikely(!pdata))
|
||||
return NULL;
|
||||
if (likely(!__percpu_populate_mask(__pdata, size, GFP_KERNEL,
|
||||
&cpu_possible_map)))
|
||||
return __pdata;
|
||||
kfree(pdata);
|
||||
return NULL;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(__alloc_percpu);
|
||||
|
||||
/**
|
||||
* free_percpu - 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 free_percpu(void *__pdata)
|
||||
{
|
||||
if (unlikely(!__pdata))
|
||||
return;
|
||||
__percpu_depopulate_mask(__pdata, cpu_possible_mask);
|
||||
kfree(__percpu_disguise(__pdata));
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(free_percpu);
|
||||
|
||||
/*
|
||||
* Generic percpu area setup.
|
||||
*/
|
||||
#ifndef CONFIG_HAVE_SETUP_PER_CPU_AREA
|
||||
unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
|
||||
|
||||
EXPORT_SYMBOL(__per_cpu_offset);
|
||||
|
||||
void __init setup_per_cpu_areas(void)
|
||||
{
|
||||
unsigned long size, i;
|
||||
char *ptr;
|
||||
unsigned long nr_possible_cpus = num_possible_cpus();
|
||||
|
||||
/* Copy section for each CPU (we discard the original) */
|
||||
size = ALIGN(PERCPU_ENOUGH_ROOM, PAGE_SIZE);
|
||||
ptr = alloc_bootmem_pages(size * nr_possible_cpus);
|
||||
|
||||
for_each_possible_cpu(i) {
|
||||
__per_cpu_offset[i] = ptr - __per_cpu_start;
|
||||
memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
|
||||
ptr += size;
|
||||
}
|
||||
}
|
||||
#endif /* CONFIG_HAVE_SETUP_PER_CPU_AREA */
|
||||
|
|
@ -46,8 +46,6 @@
|
|||
*
|
||||
* To use this allocator, arch code should do the followings.
|
||||
*
|
||||
* - drop CONFIG_HAVE_LEGACY_PER_CPU_AREA
|
||||
*
|
||||
* - define __addr_to_pcpu_ptr() and __pcpu_ptr_to_addr() to translate
|
||||
* regular address to percpu pointer and back if they need to be
|
||||
* different from the default
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user