openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

[IA64] Fix large MCA bootmem allocation 

The MCA code allocates bootmem memory for NR_CPUS, regardless
of how many cpus the system actually has.  This change allocates
memory only for cpus that actually exist.

On my test system with NR_CPUS = 1024, reserved memory was reduced by 130944k.

Before: Memory: 27886976k/28111168k available (8282k code, 242304k reserved, 5928k data, 1792k init)
After:  Memory: 28017920k/28111168k available (8282k code, 111360k reserved, 5928k data, 1792k init)

Signed-off-by: Russ Anderson <rja@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Russ Anderson 2008-02-05 17:12:32 -06:00 committed by Tony Luck
parent 427639354f
commit 785285fc8b
1 changed files with 26 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

55
arch/ia64/kernel/mca.c
View File

@ -17,7 +17,7 @@
* Copyright (C) 2000 Intel
* Copyright (C) Chuck Fleckenstein <cfleck@co.intel.com>
*
* Copyright (C) 1999, 2004 Silicon Graphics, Inc.
* Copyright (C) 1999, 2004-2008 Silicon Graphics, Inc.
* Copyright (C) Vijay Chander <vijay@engr.sgi.com>
*
* Copyright (C) 2006 FUJITSU LIMITED
@ -1762,11 +1762,8 @@ format_mca_init_stack(void *mca_data, unsigned long offset,
/* Caller prevents this from being called after init */
static void * __init_refok mca_bootmem(void)
{
void *p;
p = alloc_bootmem(sizeof(struct ia64_mca_cpu) * NR_CPUS +
KERNEL_STACK_SIZE);
return (void *)ALIGN((unsigned long)p, KERNEL_STACK_SIZE);
return __alloc_bootmem(sizeof(struct ia64_mca_cpu),
KERNEL_STACK_SIZE, 0);
}
/* Do per-CPU MCA-related initialization. */
@ -1774,33 +1771,33 @@ void __cpuinit
ia64_mca_cpu_init(void *cpu_data)
{
void *pal_vaddr;
void *data;
long sz = sizeof(struct ia64_mca_cpu);
int cpu = smp_processor_id();
static int first_time = 1;
if (first_time) {
void *mca_data;
int cpu;
first_time = 0;
mca_data = mca_bootmem();
for (cpu = 0; cpu < NR_CPUS; cpu++) {
format_mca_init_stack(mca_data,
offsetof(struct ia64_mca_cpu, mca_stack),
"MCA", cpu);
format_mca_init_stack(mca_data,
offsetof(struct ia64_mca_cpu, init_stack),
"INIT", cpu);
__per_cpu_mca[cpu] = __pa(mca_data);
mca_data += sizeof(struct ia64_mca_cpu);
}
}
/*
* The MCA info structure was allocated earlier and its
* physical address saved in __per_cpu_mca[cpu]. Copy that
* address * to ia64_mca_data so we can access it as a per-CPU
* variable.
* Structure will already be allocated if cpu has been online,
* then offlined.
*/
__get_cpu_var(ia64_mca_data) = __per_cpu_mca[smp_processor_id()];
if (__per_cpu_mca[cpu]) {
data = __va(__per_cpu_mca[cpu]);
} else {
if (first_time) {
data = mca_bootmem();
first_time = 0;
} else
data = page_address(alloc_pages_node(numa_node_id(),
GFP_KERNEL, get_order(sz)));
if (!data)
panic("Could not allocate MCA memory for cpu %d\n",
cpu);
}
format_mca_init_stack(data, offsetof(struct ia64_mca_cpu, mca_stack),
"MCA", cpu);
format_mca_init_stack(data, offsetof(struct ia64_mca_cpu, init_stack),
"INIT", cpu);
__get_cpu_var(ia64_mca_data) = __per_cpu_mca[cpu] = __pa(data);
/*
* Stash away a copy of the PTE needed to map the per-CPU page.