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OpenCloudOS-Kernel
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add per_cpu_dyn_array support 

allow dyn-array in per_cpu area, allocated dynamically.

usage:

|  /* in .h */
| struct kernel_stat {
|        struct cpu_usage_stat   cpustat;
|        unsigned int *irqs;
| };
|
|  /* in .c */
| DEFINE_PER_CPU(struct kernel_stat, kstat);
|
| DEFINE_PER_CPU_DYN_ARRAY_ADDR(per_cpu__kstat_irqs, per_cpu__kstat.irqs, sizeof(unsigned int), nr_irqs, sizeof(unsigned long), NULL);

after setup_percpu()/per_cpu_alloc_dyn_array(), the dyn_array in
per_cpu area is ready to use.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2008-08-19 20:49:44 -07:00 committed by Ingo Molnar
parent 3ddfda1186
commit 1f3fcd4b1a
4 changed files with 96 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/x86/kernel/setup_percpu.c
View File

@ -140,7 +140,7 @@ static void __init setup_cpu_pda_map(void)
*/
void __init setup_per_cpu_areas(void)
{
ssize_t size = PERCPU_ENOUGH_ROOM;
ssize_t size, old_size;
char *ptr;
int cpu;
@ -148,7 +148,8 @@ void __init setup_per_cpu_areas(void)
setup_cpu_pda_map();
/* Copy section for each CPU (we discard the original) */
size = PERCPU_ENOUGH_ROOM;
old_size = PERCPU_ENOUGH_ROOM;
size = old_size + per_cpu_dyn_array_size();
printk(KERN_INFO "PERCPU: Allocating %zd bytes of per cpu data\n",
size);
@ -176,6 +177,8 @@ void __init setup_per_cpu_areas(void)
per_cpu_offset(cpu) = ptr - __per_cpu_start;
memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
per_cpu_alloc_dyn_array(cpu, ptr + old_size);
}
printk(KERN_DEBUG "NR_CPUS: %d, nr_cpu_ids: %d, nr_node_ids %d\n",

6
include/asm-generic/vmlinux.lds.h
View File

@ -216,6 +216,12 @@
VMLINUX_SYMBOL(__dyn_array_start) = .; \
*(.dyn_array.init) \
VMLINUX_SYMBOL(__dyn_array_end) = .; \
} \
. = ALIGN((align)); \
.per_cpu_dyn_array.init : AT(ADDR(.per_cpu_dyn_array.init) - LOAD_OFFSET) { \
VMLINUX_SYMBOL(__per_cpu_dyn_array_start) = .; \
*(.per_cpu_dyn_array.init) \
VMLINUX_SYMBOL(__per_cpu_dyn_array_end) = .; \
}
#define SECURITY_INIT \
.security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \

27
include/linux/init.h
View File

@ -255,12 +255,13 @@ struct dyn_array {
void (*init_work)(void *);
};
extern struct dyn_array *__dyn_array_start[], *__dyn_array_end[];
extern struct dyn_array *__per_cpu_dyn_array_start[], *__per_cpu_dyn_array_end[];
#define DEFINE_DYN_ARRAY(nameX, sizeX, nrX, alignX, init_workX) \
#define DEFINE_DYN_ARRAY_ADDR(nameX, addrX, sizeX, nrX, alignX, init_workX) \
static struct dyn_array __dyn_array_##nameX __initdata = \
{ .name = (void **)&nameX,\
{ .name = (void **)&(nameX),\
.size = sizeX,\
.nr = &nrX,\
.nr = &(nrX),\
.align = alignX,\
.init_work = init_workX,\
}; \
@ -268,7 +269,27 @@ extern struct dyn_array *__dyn_array_start[], *__dyn_array_end[];
__attribute__((__section__(".dyn_array.init"))) = \
&__dyn_array_##nameX
#define DEFINE_DYN_ARRAY(nameX, sizeX, nrX, alignX, init_workX) \
DEFINE_DYN_ARRAY_ADDR(nameX, nameX, sizeX, nrX, alignX, init_workX)
#define DEFINE_PER_CPU_DYN_ARRAY_ADDR(nameX, addrX, sizeX, nrX, alignX, init_workX) \
static struct dyn_array __per_cpu_dyn_array_##nameX __initdata = \
{ .name = (void **)&(addrX),\
.size = sizeX,\
.nr = &(nrX),\
.align = alignX,\
.init_work = init_workX,\
}; \
static struct dyn_array *__per_cpu_dyn_array_ptr_##nameX __used \
__attribute__((__section__(".per_cpu_dyn_array.init"))) = \
&__per_cpu_dyn_array_##nameX
#define DEFINE_PER_CPU_DYN_ARRAY(nameX, sizeX, nrX, alignX, init_workX) \
DEFINE_PER_CPU_DYN_ARRAY_ADDR(nameX, nameX, nrX, alignX, init_workX)
extern void pre_alloc_dyn_array(void);
extern unsigned long per_cpu_dyn_array_size(void);
extern void per_cpu_alloc_dyn_array(int cpu, char *ptr);
#endif /* __ASSEMBLY__ */
/**

63
init/main.c
View File

@ -391,17 +391,19 @@ EXPORT_SYMBOL(__per_cpu_offset);
static void __init setup_per_cpu_areas(void)
{
unsigned long size, i;
unsigned long size, i, old_size;
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);
old_size = PERCPU_ENOUGH_ROOM;
size = ALIGN(old_size + per_cpu_dyn_array_size(), 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);
per_cpu_alloc_dyn_array(i, ptr + old_size);
ptr += size;
}
}
@ -559,6 +561,63 @@ void pre_alloc_dyn_array(void)
#endif
}
unsigned long per_cpu_dyn_array_size(void)
{
unsigned long total_size = 0;
#ifdef CONFIG_HAVE_DYN_ARRAY
unsigned long size;
struct dyn_array **daa;
for (daa = __per_cpu_dyn_array_start ; daa < __per_cpu_dyn_array_end; daa++) {
struct dyn_array *da = *daa;
size = da->size * (*da->nr);
print_fn_descriptor_symbol("per_cpu_dyna_array %s ", da->name);
printk(KERN_CONT "size:%#lx nr:%d align:%#lx\n",
da->size, *da->nr, da->align);
total_size += roundup(size, da->align);
}
if (total_size)
printk(KERN_DEBUG "per_cpu_dyna_array total_size: %#lx\n",
total_size);
#endif
return total_size;
}
void per_cpu_alloc_dyn_array(int cpu, char *ptr)
{
#ifdef CONFIG_HAVE_DYN_ARRAY
unsigned long size, phys;
struct dyn_array **daa;
unsigned long addr;
void **array;
phys = virt_to_phys(ptr);
for (daa = __per_cpu_dyn_array_start ; daa < __per_cpu_dyn_array_end; daa++) {
struct dyn_array *da = *daa;
size = da->size * (*da->nr);
print_fn_descriptor_symbol("per_cpu_dyna_array %s ", da->name);
printk(KERN_CONT "size:%#lx nr:%d align:%#lx",
da->size, *da->nr, da->align);
phys = roundup(phys, da->align);
addr = (unsigned long)da->name;
addr += per_cpu_offset(cpu);
array = (void **)addr;
*array = phys_to_virt(phys);
*da->name = *array; /* so init_work could use it directly */
printk(KERN_CONT " %p ==> [%#lx - %#lx]\n", array, phys, phys + size);
phys += size;
if (da->init_work) {
da->init_work(da);
}
}
#endif
}
asmlinkage void __init start_kernel(void)
{
char * command_line;