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x86: remove static boot_cpu_pda array v2 

* Remove the boot_cpu_pda array and pointer table from the data section.
    Allocate the pointer table and array during init.  do_boot_cpu()
    will reallocate the pda in node local memory and if the cpu is being
    brought up before the bootmem array is released (after_bootmem = 0),
    then it will free the initial pda.  This will happen for all cpus
    present at system startup.

    This removes 512k + 32k bytes from the data section.

For inclusion into sched-devel/latest tree.

Based on:
	git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
    +   sched-devel/latest  .../mingo/linux-2.6-sched-devel.git

Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Mike Travis 2008-05-12 21:21:13 +02:00 committed by Ingo Molnar
parent 9f248bde9d
commit 3461b0af02
6 changed files with 135 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
arch/x86/kernel/head64.c
View File

@ -25,6 +25,24 @@
#include <asm/e820.h>
#include <asm/bios_ebda.h>
/* boot cpu pda */
static struct x8664_pda _boot_cpu_pda __read_mostly;
#ifdef CONFIG_SMP
#ifdef CONFIG_DEBUG_PER_CPU_MAPS
/*
* We install an empty cpu_pda pointer table to trap references before
* the actual cpu_pda pointer table is created in setup_cpu_pda_map().
*/
static struct x8664_pda *__cpu_pda[NR_CPUS] __initdata;
#else
static struct x8664_pda *__cpu_pda[1] __read_mostly;
#endif
#else /* !CONFIG_SMP (NR_CPUS will be 1) */
static struct x8664_pda *__cpu_pda[NR_CPUS] __read_mostly;
#endif
static void __init zap_identity_mappings(void)
{
pgd_t *pgd = pgd_offset_k(0UL);
@ -156,10 +174,12 @@ void __init x86_64_start_kernel(char * real_mode_data)
early_printk("Kernel alive\n");
for (i = 0; i < NR_CPUS; i++)
cpu_pda(i) = &boot_cpu_pda[i];
_cpu_pda = __cpu_pda;
cpu_pda(0) = &_boot_cpu_pda;
pda_init(0);
early_printk("Kernel really alive\n");
copy_bootdata(__va(real_mode_data));
reserve_early(__pa_symbol(&_text), __pa_symbol(&_end), "TEXT DATA BSS");

73
arch/x86/kernel/setup.c
View File

@ -101,6 +101,50 @@ static inline void setup_cpumask_of_cpu(void) { }
*/
unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
EXPORT_SYMBOL(__per_cpu_offset);
static inline void setup_cpu_pda_map(void) { }
#elif !defined(CONFIG_SMP)
static inline void setup_cpu_pda_map(void) { }
#else /* CONFIG_SMP && CONFIG_X86_64 */
/*
* Allocate cpu_pda pointer table and array via alloc_bootmem.
*/
static void __init setup_cpu_pda_map(void)
{
char *pda;
struct x8664_pda **new_cpu_pda;
unsigned long size;
int cpu;
size = roundup(sizeof(struct x8664_pda), cache_line_size());
/* allocate cpu_pda array and pointer table */
{
unsigned long tsize = nr_cpu_ids * sizeof(void *);
unsigned long asize = size * (nr_cpu_ids - 1);
tsize = roundup(tsize, cache_line_size());
new_cpu_pda = alloc_bootmem(tsize + asize);
pda = (char *)new_cpu_pda + tsize;
}
/* initialize pointer table to static pda's */
for_each_possible_cpu(cpu) {
if (cpu == 0) {
/* leave boot cpu pda in place */
new_cpu_pda[0] = cpu_pda(0);
continue;
}
new_cpu_pda[cpu] = (struct x8664_pda *)pda;
new_cpu_pda[cpu]->in_bootmem = 1;
pda += size;
}
/* point to new pointer table */
_cpu_pda = new_cpu_pda;
}
#endif
/*
@ -110,46 +154,43 @@ EXPORT_SYMBOL(__per_cpu_offset);
*/
void __init setup_per_cpu_areas(void)
{
int i, highest_cpu = 0;
unsigned long size;
ssize_t size = PERCPU_ENOUGH_ROOM;
char *ptr;
int cpu;
#ifdef CONFIG_HOTPLUG_CPU
prefill_possible_map();
#else
nr_cpu_ids = num_processors;
#endif
/* Setup cpu_pda map */
setup_cpu_pda_map();
/* Copy section for each CPU (we discard the original) */
size = PERCPU_ENOUGH_ROOM;
printk(KERN_INFO "PERCPU: Allocating %lu bytes of per cpu data\n",
size);
for_each_possible_cpu(i) {
char *ptr;
for_each_possible_cpu(cpu) {
#ifndef CONFIG_NEED_MULTIPLE_NODES
ptr = alloc_bootmem_pages(size);
#else
int node = early_cpu_to_node(i);
int node = early_cpu_to_node(cpu);
if (!node_online(node) || !NODE_DATA(node)) {
ptr = alloc_bootmem_pages(size);
printk(KERN_INFO
"cpu %d has no node %d or node-local memory\n",
i, node);
cpu, node);
}
else
ptr = alloc_bootmem_pages_node(NODE_DATA(node), size);
#endif
if (!ptr)
panic("Cannot allocate cpu data for CPU %d\n", i);
#ifdef CONFIG_X86_64
cpu_pda(i)->data_offset = ptr - __per_cpu_start;
#else
__per_cpu_offset[i] = ptr - __per_cpu_start;
#endif
per_cpu_offset(cpu) = ptr - __per_cpu_start;
memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
highest_cpu = i;
}
nr_cpu_ids = highest_cpu + 1;
printk(KERN_DEBUG "NR_CPUS: %d, nr_cpu_ids: %d, nr_node_ids %d\n",
NR_CPUS, nr_cpu_ids, nr_node_ids);
@ -199,7 +240,7 @@ void __cpuinit numa_set_node(int cpu, int node)
{
int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
if (node != NUMA_NO_NODE)
if (cpu_pda(cpu) && node != NUMA_NO_NODE)
cpu_pda(cpu)->nodenumber = node;
if (cpu_to_node_map)

8
arch/x86/kernel/setup64.c
View File

@ -12,6 +12,7 @@
#include <linux/bitops.h>
#include <linux/module.h>
#include <linux/kgdb.h>
#include <linux/topology.h>
#include <asm/pda.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
@ -34,9 +35,8 @@ struct boot_params boot_params;
cpumask_t cpu_initialized __cpuinitdata = CPU_MASK_NONE;
struct x8664_pda *_cpu_pda[NR_CPUS] __read_mostly;
struct x8664_pda **_cpu_pda __read_mostly;
EXPORT_SYMBOL(_cpu_pda);
struct x8664_pda boot_cpu_pda[NR_CPUS] __cacheline_aligned;
struct desc_ptr idt_descr = { 256 * 16 - 1, (unsigned long) idt_table };
@ -114,8 +114,10 @@ void pda_init(int cpu)
__get_free_pages(GFP_ATOMIC, IRQSTACK_ORDER);
if (!pda->irqstackptr)
panic("cannot allocate irqstack for cpu %d", cpu);
}
if (pda->nodenumber == 0 && cpu_to_node(cpu) != NUMA_NO_NODE)
pda->nodenumber = cpu_to_node(cpu);
}
pda->irqstackptr += IRQSTACKSIZE-64;
}

59
arch/x86/kernel/smpboot.c
View File

@ -816,6 +816,43 @@ static void __cpuinit do_fork_idle(struct work_struct *work)
complete(&c_idle->done);
}
/*
* Allocate node local memory for the AP pda.
*
* Must be called after the _cpu_pda pointer table is initialized.
*/
static int __cpuinit get_local_pda(int cpu)
{
struct x8664_pda *oldpda, *newpda;
unsigned long size = sizeof(struct x8664_pda);
int node = cpu_to_node(cpu);
if (cpu_pda(cpu) && !cpu_pda(cpu)->in_bootmem)
return 0;
oldpda = cpu_pda(cpu);
newpda = kmalloc_node(size, GFP_ATOMIC, node);
if (!newpda) {
printk(KERN_ERR "Could not allocate node local PDA "
"for CPU %d on node %d\n", cpu, node);
if (oldpda)
return 0; /* have a usable pda */
else
return -1;
}
if (oldpda) {
memcpy(newpda, oldpda, size);
if (!after_bootmem)
free_bootmem((unsigned long)oldpda, size);
}
newpda->in_bootmem = 0;
cpu_pda(cpu) = newpda;
return 0;
}
static int __cpuinit do_boot_cpu(int apicid, int cpu)
/*
* NOTE - on most systems this is a PHYSICAL apic ID, but on multiquad
@ -841,19 +878,11 @@ static int __cpuinit do_boot_cpu(int apicid, int cpu)
}
/* Allocate node local memory for AP pdas */
if (cpu_pda(cpu) == &boot_cpu_pda[cpu]) {
struct x8664_pda *newpda, *pda;
int node = cpu_to_node(cpu);
pda = cpu_pda(cpu);
newpda = kmalloc_node(sizeof(struct x8664_pda), GFP_ATOMIC,
node);
if (newpda) {
memcpy(newpda, pda, sizeof(struct x8664_pda));
cpu_pda(cpu) = newpda;
} else
printk(KERN_ERR
"Could not allocate node local PDA for CPU %d on node %d\n",
cpu, node);
if (cpu > 0) {
boot_error = get_local_pda(cpu);
if (boot_error)
goto restore_state;
/* if can't get pda memory, can't start cpu */
}
#endif
@ -972,6 +1001,8 @@ do_rest:
}
}
restore_state:
if (boot_error) {
/* Try to put things back the way they were before ... */
unmap_cpu_to_logical_apicid(cpu);
@ -1347,6 +1378,8 @@ __init void prefill_possible_map(void)
for (i = 0; i < possible; i++)
cpu_set(i, cpu_possible_map);
nr_cpu_ids = possible;
}
static void __ref remove_cpu_from_maps(int cpu)

6
include/asm-x86/pda.h
View File

@ -22,7 +22,8 @@ struct x8664_pda {
offset 40!!! */
#endif
char *irqstackptr;
int nodenumber; /* number of current node */
short nodenumber; /* number of current node (32k max) */
short in_bootmem; /* pda lives in bootmem */
unsigned int __softirq_pending;
unsigned int __nmi_count; /* number of NMI on this CPUs */
short mmu_state;
@ -38,8 +39,7 @@ struct x8664_pda {
unsigned irq_spurious_count;
} ____cacheline_aligned_in_smp;
extern struct x8664_pda *_cpu_pda[];
extern struct x8664_pda boot_cpu_pda[];
extern struct x8664_pda **_cpu_pda;
extern void pda_init(int);
#define cpu_pda(i) (_cpu_pda[i])

1
include/linux/mm.h
View File

@ -1024,6 +1024,7 @@ extern void mem_init(void);
extern void show_mem(void);
extern void si_meminfo(struct sysinfo * val);
extern void si_meminfo_node(struct sysinfo *val, int nid);
extern int after_bootmem;
#ifdef CONFIG_NUMA
extern void setup_per_cpu_pageset(void);