lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

add per_cpu_dyn_array support

Browse Source 
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
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",