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Subject[PATCH 05/25] x86: alloc dyn_array all alltogether
Date
so could spare some memory with small alignment in bootmem

also tighten the alignment checking..., and make print out less debug info

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
---
arch/x86/kernel/setup_percpu.c | 16 +++++++---
include/linux/init.h | 2 +-
init/main.c | 65 ++++++++++++++++++++++++++++++---------
3 files changed, 62 insertions(+), 21 deletions(-)
diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index 13ba7a8..4702c12 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -140,26 +140,31 @@ static void __init setup_cpu_pda_map(void)
*/
void __init setup_per_cpu_areas(void)
{
- ssize_t size, old_size;
+ ssize_t size, old_size, da_size;
char *ptr;
int cpu;
+ unsigned long align = 1;

/* Setup cpu_pda map */
setup_cpu_pda_map();

/* Copy section for each CPU (we discard the original) */
old_size = PERCPU_ENOUGH_ROOM;
- size = old_size + per_cpu_dyn_array_size();
+ da_size = per_cpu_dyn_array_size(&align);
+ align = max_t(unsigned long, PAGE_SIZE, align);
+ size = roundup(old_size + da_size, align);
printk(KERN_INFO "PERCPU: Allocating %zd bytes of per cpu data\n",
size);

for_each_possible_cpu(cpu) {
#ifndef CONFIG_NEED_MULTIPLE_NODES
- ptr = alloc_bootmem_pages(size);
+ ptr = __alloc_bootmem_nopanic(size, align,
+ __pa(MAX_DMA_ADDRESS));
#else
int node = early_cpu_to_node(cpu);
if (!node_online(node) || !NODE_DATA(node)) {
- ptr = alloc_bootmem_pages(size);
+ ptr = __alloc_bootmem_nopanic(size, align,
+ __pa(MAX_DMA_ADDRESS));
printk(KERN_INFO
"cpu %d has no node %d or node-local memory\n",
cpu, node);
@@ -168,7 +173,8 @@ void __init setup_per_cpu_areas(void)
cpu, __pa(ptr));
}
else {
- ptr = alloc_bootmem_pages_node(NODE_DATA(node), size);
+ ptr = __alloc_bootmem_node(NODE_DATA(node), size, align,
+ __pa(MAX_DMA_ADDRESS));
if (ptr)
printk(KERN_DEBUG "per cpu data for cpu%d on node%d at %016lx\n",
cpu, node, __pa(ptr));
diff --git a/include/linux/init.h b/include/linux/init.h
index 9fbe61b..2e42af8 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -291,7 +291,7 @@ extern struct dyn_array *__per_cpu_dyn_array_start[], *__per_cpu_dyn_array_end[]
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 unsigned long per_cpu_dyn_array_size(unsigned long *align);
extern void per_cpu_alloc_dyn_array(int cpu, char *ptr);
#endif /* __ASSEMBLY__ */

diff --git a/init/main.c b/init/main.c
index a600562..3454b4a 100644
--- a/init/main.c
+++ b/init/main.c
@@ -397,10 +397,14 @@ static void __init setup_per_cpu_areas(void)
unsigned long size, i, old_size;
char *ptr;
unsigned long nr_possible_cpus = num_possible_cpus();
+ unsigned long align = 1;
+ unsigned da_size;

/* Copy section for each CPU (we discard the original) */
old_size = PERCPU_ENOUGH_ROOM;
- size = ALIGN(old_size + per_cpu_dyn_array_size(), PAGE_SIZE);
+ da_size = per_cpu_dyn_array_size(&align);
+ align = max_t(unsigned long, PAGE_SIZE, align);
+ size = ALIGN(old_size + da_size, align);
ptr = alloc_bootmem_pages(size * nr_possible_cpus);

for_each_possible_cpu(i) {
@@ -544,45 +548,78 @@ void __init __weak thread_info_cache_init(void)
void pre_alloc_dyn_array(void)
{
#ifdef CONFIG_HAVE_DYN_ARRAY
- unsigned long size, phys = 0;
+ unsigned long total_size = 0, size, phys;
+ unsigned long max_align = 1;
struct dyn_array **daa;
+ char *ptr;

+ /* get the total size at first */
for (daa = __dyn_array_start ; daa < __dyn_array_end; daa++) {
struct dyn_array *da = *daa;

size = da->size * (*da->nr);
- print_fn_descriptor_symbol("dyna_array %s ", da->name);
- printk(KERN_CONT "size:%#lx nr:%d align:%#lx",
+ print_fn_descriptor_symbol("dyn_array %s ", da->name);
+ printk(KERN_CONT "size:%#lx nr:%d align:%#lx\n",
da->size, *da->nr, da->align);
- *da->name = __alloc_bootmem_nopanic(size, da->align, phys);
- phys = virt_to_phys(*da->name);
+ total_size += roundup(size, da->align);
+ if (da->align > max_align)
+ max_align = da->align;
+ }
+ if (total_size)
+ printk(KERN_DEBUG "dyn_array total_size: %#lx\n",
+ total_size);
+ else
+ return;
+
+ /* allocate them all together */
+ max_align = max_t(unsigned long, max_align, PAGE_SIZE);
+ ptr = __alloc_bootmem_nopanic(total_size, max_align, 0);
+ if (!ptr)
+ panic("Can not alloc dyn_alloc\n");
+
+ phys = virt_to_phys(ptr);
+ for (daa = __dyn_array_start ; daa < __dyn_array_end; daa++) {
+ struct dyn_array *da = *daa;
+
+ size = da->size * (*da->nr);
+ print_fn_descriptor_symbol("dyn_array %s ", da->name);
+
+ phys = roundup(phys, da->align);
+ *da->name = phys_to_virt(phys);
printk(KERN_CONT " ==> [%#lx - %#lx]\n", phys, phys + size);

+ phys += size;
+
if (da->init_work)
da->init_work(da);
}
#endif
}

-unsigned long per_cpu_dyn_array_size(void)
+unsigned long per_cpu_dyn_array_size(unsigned long *align)
{
unsigned long total_size = 0;
#ifdef CONFIG_HAVE_DYN_ARRAY
unsigned long size;
struct dyn_array **daa;
+ unsigned max_align = 1;

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);
+ print_fn_descriptor_symbol("per_cpu_dyn_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 (da->align > max_align)
+ max_align = da->align;
}
- if (total_size)
- printk(KERN_DEBUG "per_cpu_dyna_array total_size: %#lx\n",
+ if (total_size) {
+ printk(KERN_DEBUG "per_cpu_dyn_array total_size: %#lx\n",
total_size);
+ *align = max_align;
+ }
#endif
return total_size;
}
@@ -596,14 +633,11 @@ void per_cpu_alloc_dyn_array(int cpu, char *ptr)
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);
+ print_fn_descriptor_symbol("per_cpu_dyn_array %s ", da->name);

phys = roundup(phys, da->align);
addr = (unsigned long)da->name;
@@ -611,7 +645,8 @@ void per_cpu_alloc_dyn_array(int cpu, char *ptr)
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);
+ printk(KERN_CONT " ==> [%#lx - %#lx]\n", phys, phys + size);
+
phys += size;

if (da->init_work) {
--
1.5.4.5


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