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Message-ID: <478D325A.7080409@sgi.com>
Date: Tue, 15 Jan 2008 14:23:22 -0800
From: Mike Travis <travis@....com>
To: Andi Kleen <andi@...stfloor.org>
CC: Andrew Morton <akpm@...ux-foundation.org>, mingo@...e.hu,
Christoph Lameter <clameter@....com>,
Jack Steiner <steiner@....com>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/10] x86: Change NR_CPUS arrays in numa_64 V2
Andi Kleen wrote:
> travis@....com writes:
>> +
>> /* Returns the number of the node containing CPU 'cpu' */
>> static inline int cpu_to_node(int cpu)
>> {
>> - return cpu_to_node_map[cpu];
>> + u16 *cpu_to_node_map = x86_cpu_to_node_map_early_ptr;
>> +
>> + if (cpu_to_node_map)
>> + return cpu_to_node_map[cpu];
>> + else if(per_cpu_offset(cpu))
>> + return per_cpu(x86_cpu_to_node_map, cpu);
>> + else
>> + return NUMA_NO_NODE;
>
> Seems a little big now to be still inlined.
>
> Also I wonder if there are really that many early callers that it
> isn't feasible to just convert them to a early_cpu_to_node(). Also
> early_cpu_to_node() should really not be speed critical, so just
> linearly searching some other table instead of setting up an explicit
> array should be fine for that.
>
> -Andi
Is this what you had in mind? (It's still panic'ing early in kernel startup
so it's not quite done.)
There are a fair number of early callers of cpu_to_node() particularly when
HOTPLUG_CPU is enabled.
One note is that I plan to optimize the check for "earliness" with a flag
that can be checked in the local node instead of always going back to node
0 to check for a non-null "early_ptr". This will shorten up the inline
functions quite a bit maybe making these mods unnecessary?
Thanks,
Mike
---
diff -pur V2/arch/x86/kernel/setup64.c V3/arch/x86/kernel/setup64.c
--- V2/arch/x86/kernel/setup64.c 2008-01-15 14:06:03.000000000 -0800
+++ V3/arch/x86/kernel/setup64.c 2008-01-15 14:01:09.000000000 -0800
@@ -100,12 +100,12 @@ void __init setup_per_cpu_areas(void)
for_each_cpu_mask (i, cpu_possible_map) {
char *ptr;
- if (!NODE_DATA(cpu_to_node(i))) {
+ if (!NODE_DATA(early_cpu_to_node(i))) {
printk("cpu with no node %d, num_online_nodes %d\n",
i, num_online_nodes());
ptr = alloc_bootmem_pages(size);
} else {
- ptr = alloc_bootmem_pages_node(NODE_DATA(cpu_to_node(i)), size);
+ ptr = alloc_bootmem_pages_node(NODE_DATA(early_cpu_to_node(i)), size);
}
if (!ptr)
panic("Cannot allocate cpu data for CPU %d\n", i);
diff -pur V2/arch/x86/kernel/smpboot_64.c V3/arch/x86/kernel/smpboot_64.c
--- V2/arch/x86/kernel/smpboot_64.c 2008-01-15 14:06:19.000000000 -0800
+++ V3/arch/x86/kernel/smpboot_64.c 2008-01-15 14:01:09.000000000 -0800
@@ -569,7 +569,7 @@ static int __cpuinit do_boot_cpu(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);
+ int node = early_cpu_to_node(cpu);
pda = cpu_pda(cpu);
newpda = kmalloc_node(sizeof (struct x8664_pda), GFP_ATOMIC,
node);
@@ -702,7 +702,7 @@ do_rest:
if (boot_error) {
cpu_clear(cpu, cpu_callout_map); /* was set here (do_boot_cpu()) */
clear_bit(cpu, (unsigned long *)&cpu_initialized); /* was set by cpu_init() */
- clear_node_cpumask(cpu); /* was set by numa_add_cpu */
+ clear_bit(cpu, (unsigned long *)&node_to_cpumask_map[early_cpu_to_node(cpu)]);
cpu_clear(cpu, cpu_present_map);
cpu_clear(cpu, cpu_possible_map);
per_cpu(x86_cpu_to_apicid, cpu) = BAD_APICID;
@@ -1060,7 +1060,7 @@ void remove_cpu_from_maps(void)
cpu_clear(cpu, cpu_callout_map);
cpu_clear(cpu, cpu_callin_map);
clear_bit(cpu, (unsigned long *)&cpu_initialized); /* was set by cpu_init() */
- clear_node_cpumask(cpu);
+ clear_bit(cpu, (unsigned long *)&node_to_cpumask_map[cpu_to_node(cpu)]);
}
int __cpu_disable(void)
diff -pur V2/arch/x86/kernel/vsyscall_64.c V3/arch/x86/kernel/vsyscall_64.c
--- V2/arch/x86/kernel/vsyscall_64.c 2008-01-15 14:06:03.000000000 -0800
+++ V3/arch/x86/kernel/vsyscall_64.c 2008-01-15 14:01:09.000000000 -0800
@@ -289,7 +289,7 @@ static void __cpuinit vsyscall_set_cpu(i
unsigned long *d;
unsigned long node = 0;
#ifdef CONFIG_NUMA
- node = cpu_to_node(cpu);
+ node = early_cpu_to_node(cpu);
#endif
if (cpu_has(&cpu_data(cpu), X86_FEATURE_RDTSCP))
write_rdtscp_aux((node << 12) | cpu);
diff -pur V2/arch/x86/mm/numa_64.c V3/arch/x86/mm/numa_64.c
--- V2/arch/x86/mm/numa_64.c 2008-01-15 14:06:19.000000000 -0800
+++ V3/arch/x86/mm/numa_64.c 2008-01-15 14:01:09.000000000 -0800
@@ -281,7 +281,7 @@ void __init numa_init_array(void)
rr = first_node(node_online_map);
for (i = 0; i < NR_CPUS; i++) {
- if (cpu_to_node(i) != NUMA_NO_NODE)
+ if (early_cpu_to_node(i) != NUMA_NO_NODE)
continue;
numa_set_node(i, rr);
rr = next_node(rr, node_online_map);
@@ -558,7 +558,7 @@ void __init numa_initmem_init(unsigned l
__cpuinit void numa_add_cpu(int cpu)
{
- set_bit(cpu, (unsigned long *)&node_to_cpumask_map[cpu_to_node(cpu)]);
+ set_bit(cpu, (unsigned long *)&node_to_cpumask_map[early_cpu_to_node(cpu)]);
}
void __cpuinit numa_set_node(int cpu, int node)
diff -pur V2/arch/x86/mm/srat_64.c V3/arch/x86/mm/srat_64.c
--- V2/arch/x86/mm/srat_64.c 2008-01-15 14:06:18.000000000 -0800
+++ V3/arch/x86/mm/srat_64.c 2008-01-15 14:01:09.000000000 -0800
@@ -382,9 +382,10 @@ int __init acpi_scan_nodes(unsigned long
setup_node_bootmem(i, nodes[i].start, nodes[i].end);
for (i = 0; i < NR_CPUS; i++) {
- if (cpu_to_node(i) == NUMA_NO_NODE)
+ int node = early_cpu_to_node(i);
+ if (node == NUMA_NO_NODE)
continue;
- if (!node_isset(cpu_to_node(i), node_possible_map))
+ if (!node_isset(node, node_possible_map))
numa_set_node(i, NUMA_NO_NODE);
}
numa_init_array();
diff -pur V2/include/asm-x86/numa_64.h V3/include/asm-x86/numa_64.h
--- V2/include/asm-x86/numa_64.h 2008-01-15 14:06:19.000000000 -0800
+++ V3/include/asm-x86/numa_64.h 2008-01-15 14:01:09.000000000 -0800
@@ -29,15 +29,8 @@ extern void setup_node_bootmem(int nodei
#ifdef CONFIG_NUMA
extern void __init init_cpu_to_node(void);
-
-static inline void clear_node_cpumask(int cpu)
-{
- clear_bit(cpu, (unsigned long *)&node_to_cpumask_map[cpu_to_node(cpu)]);
-}
-
#else
#define init_cpu_to_node() do {} while (0)
-#define clear_node_cpumask(cpu) do {} while (0)
#endif
#endif
diff -pur V2/include/asm-x86/topology.h V3/include/asm-x86/topology.h
--- V2/include/asm-x86/topology.h 2008-01-15 14:06:19.000000000 -0800
+++ V3/include/asm-x86/topology.h 2008-01-15 14:01:09.000000000 -0800
@@ -38,7 +38,8 @@ extern cpumask_t node_to_cpumask_map[];
#define NUMA_NO_NODE ((u16)(~0))
/* Returns the number of the node containing CPU 'cpu' */
-static inline int cpu_to_node(int cpu)
+static inline int early_cpu_to_node(int cpu)
{
u16 *cpu_to_node_map = x86_cpu_to_node_map_early_ptr;
@@ -50,6 +51,15 @@ static inline int cpu_to_node(int cpu)
return NUMA_NO_NODE;
}
+static inline int cpu_to_node(int cpu)
+{
+ if(per_cpu_offset(cpu))
+ return per_cpu(x86_cpu_to_node_map, cpu);
+ else
+ return NUMA_NO_NODE;
+}
+
/*
* Returns the number of the node containing Node 'node'. This
* architecture is flat, so it is a pretty simple function!
diff -pur V2/include/linux/mmzone.h V3/include/linux/mmzone.h
--- V2/include/linux/mmzone.h 2008-01-15 14:06:03.000000000 -0800
+++ V3/include/linux/mmzone.h 2008-01-15 14:01:09.000000000 -0800
@@ -692,6 +692,7 @@ extern char numa_zonelist_order[];
/* Returns the number of the current Node. */
#ifndef numa_node_id
#define numa_node_id() (cpu_to_node(raw_smp_processor_id()))
+#define early_numa_node_id() (early_cpu_to_node(raw_smp_processor_id()))
#endif
#ifndef CONFIG_NEED_MULTIPLE_NODES
--
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