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Date:	Tue, 27 Oct 2009 13:42:32 -0700
From:	Mike Travis <travis@....com>
To:	David Rientjes <rientjes@...gle.com>
CC:	Ingo Molnar <mingo@...e.hu>, Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jack Steiner <steiner@....com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Yinghai Lu <yinghai@...nel.org>, Mel Gorman <mel@....ul.ie>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [patch] x86: reduce srat verbosity in the kernel log

I applied your previous patch with the change to use static and
here's the console output from a live system:


[    0.000000] SRAT: PXM 0 -> APIC {0-7,16-23} -> Node 0
[    0.000000] SRAT: PXM 1 -> APIC {32-39,48-55} -> Node 1
[    0.000000] SRAT: PXM 2 -> APIC {64-71,80-87} -> Node 2
[    0.000000] SRAT: PXM 3 -> APIC {96-103,112-119} -> Node 3
[    0.000000] SRAT: PXM 4 -> APIC {128-135,144-151} -> Node 4
[    0.000000] SRAT: PXM 5 -> APIC {160-167,176-183} -> Node 5
[    0.000000] SRAT: PXM 6 -> APIC {192-199,208-215} -> Node 6
[    0.000000] SRAT: PXM 7 -> APIC {224-231,240-247} -> Node 7
[    0.000000] SRAT: PXM 8 -> APIC {256-263,272-279} -> Node 8
[    0.000000] SRAT: PXM 9 -> APIC {288-295,304-311} -> Node 9
[    0.000000] SRAT: PXM 10 -> APIC {320-327,336-343} -> Node 10
[    0.000000] SRAT: PXM 11 -> APIC {352-359,368-375} -> Node 11
[    0.000000] SRAT: PXM 12 -> APIC {384-391,400-407} -> Node 12
[    0.000000] SRAT: PXM 13 -> APIC {416-423,432-439} -> Node 13
[    0.000000] SRAT: PXM 14 -> APIC {448-455,464-471} -> Node 14
[    0.000000] SRAT: PXM 15 -> APIC {480-487,496-503} -> Node 15
[    0.000000] SRAT: PXM 16 -> APIC {512-519,528-535} -> Node 16
[    0.000000] SRAT: PXM 17 -> APIC {544-551,560-567} -> Node 17
[    0.000000] SRAT: PXM 18 -> APIC {576-583,592-599} -> Node 18
[    0.000000] SRAT: PXM 19 -> APIC {608-615,624-631} -> Node 19
[    0.000000] SRAT: PXM 20 -> APIC {640-647,656-663} -> Node 20
[    0.000000] SRAT: PXM 21 -> APIC {672-679,688-695} -> Node 21
[    0.000000] SRAT: PXM 22 -> APIC {704-711,720-727} -> Node 22
[    0.000000] SRAT: PXM 23 -> APIC {736-743,752-759} -> Node 23   

                                                                                              
David Rientjes wrote:
> On Tue, 27 Oct 2009, Mike Travis wrote:
> 
>> Hi David,
>>
>> Very Cool, I'll try it out and let you know how it goes.
>>
>> Note that it would be better to declare the BITMAP in the
>> static initdata section so it doesn't grow the stack by 4k
>> bytes.  (And it's thrown away after the kernel starts.)
>>
> 
> Right, here's an updated version.  I was thinking of MAX_PXM_DOMAINS being 
> 256 instead of MAX_LOCAL_APIC :)
> 
> Here's an updated version.  apicid_map and apicid_list don't need to be 
> synchronized because there're no concurrency issues here on init.
> 
> 
> 
> x86: reduce srat verbosity in the kernel log
> 
> It's possible to reduce the number of SRAT messages emitted to the kernel
> log by printing each valid pxm once and then creating bitmaps to represent
> the apicids that map to the same node.
> 
> This reduces lines such as
> 
> 	SRAT: PXM 0 -> APIC 0 -> Node 0
> 	SRAT: PXM 0 -> APIC 1 -> Node 0
> 	SRAT: PXM 1 -> APIC 2 -> Node 1
> 	SRAT: PXM 1 -> APIC 3 -> Node 1
> 
> to
> 
> 	SRAT: PXM 0 -> APIC {0-1} -> Node 0
> 	SRAT: PXM 1 -> APIC {2-3} -> Node 1
> 
> Signed-off-by: David Rientjes <rientjes@...gle.com>
> ---
>  arch/x86/mm/srat_64.c |   32 ++++++++++++++++++++++++++++----
>  drivers/acpi/numa.c   |    5 +++++
>  include/linux/acpi.h  |    3 ++-
>  3 files changed, 35 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/x86/mm/srat_64.c b/arch/x86/mm/srat_64.c
> --- a/arch/x86/mm/srat_64.c
> +++ b/arch/x86/mm/srat_64.c
> @@ -36,6 +36,9 @@ static int num_node_memblks __initdata;
>  static struct bootnode node_memblk_range[NR_NODE_MEMBLKS] __initdata;
>  static int memblk_nodeid[NR_NODE_MEMBLKS] __initdata;
>  
> +static DECLARE_BITMAP(apicid_map, MAX_LOCAL_APIC) __initdata;
> +static char apicid_list[MAX_LOCAL_APIC] __initdata;
> +
>  static __init int setup_node(int pxm)
>  {
>  	return acpi_map_pxm_to_node(pxm);
> @@ -136,8 +139,6 @@ acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
>  	apicid_to_node[apic_id] = node;
>  	node_set(node, cpu_nodes_parsed);
>  	acpi_numa = 1;
> -	printk(KERN_INFO "SRAT: PXM %u -> APIC %u -> Node %u\n",
> -	       pxm, apic_id, node);
>  }
>  
>  /* Callback for Proximity Domain -> LAPIC mapping */
> @@ -170,8 +171,31 @@ acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
>  	apicid_to_node[apic_id] = node;
>  	node_set(node, cpu_nodes_parsed);
>  	acpi_numa = 1;
> -	printk(KERN_INFO "SRAT: PXM %u -> APIC %u -> Node %u\n",
> -	       pxm, apic_id, node);
> +}
> +
> +void __init acpi_numa_print_srat_mapping(void)
> +{
> +	int i, j;
> +
> +	for (i = 0; i < MAX_PXM_DOMAINS; i++) {
> +		int nid;
> +
> +		nid = pxm_to_node(i);
> +		if (nid == NUMA_NO_NODE)
> +			continue;
> +
> +		bitmap_zero(apicid_map, MAX_LOCAL_APIC);
> +		for (j = 0; j < MAX_LOCAL_APIC; j++)
> +			if (apicid_to_node[j] == nid)
> +				set_bit(j, apicid_map);
> +
> +		if (bitmap_empty(apicid_map, MAX_LOCAL_APIC))
> +			continue;
> +		bitmap_scnlistprintf(apicid_list, MAX_LOCAL_APIC,
> +				     apicid_map, MAX_LOCAL_APIC);
> +		pr_info("SRAT: PXM %u -> APIC {%s} -> Node %u\n",
> +			i, apicid_list, nid);
> +	}
>  }
>  
>  #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
> diff --git a/drivers/acpi/numa.c b/drivers/acpi/numa.c
> --- a/drivers/acpi/numa.c
> +++ b/drivers/acpi/numa.c
> @@ -281,6 +281,10 @@ acpi_table_parse_srat(enum acpi_srat_type id,
>  					    handler, max_entries);
>  }
>  
> +void __init __attribute__((weak)) acpi_numa_print_srat_mapping(void)
> +{
> +}
> +
>  int __init acpi_numa_init(void)
>  {
>  	/* SRAT: Static Resource Affinity Table */
> @@ -292,6 +296,7 @@ int __init acpi_numa_init(void)
>  		acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
>  				      acpi_parse_memory_affinity,
>  				      NR_NODE_MEMBLKS);
> +		acpi_numa_print_srat_mapping();
>  	}
>  
>  	/* SLIT: System Locality Information Table */
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -92,12 +92,13 @@ int acpi_table_parse_madt (enum acpi_madt_type id, acpi_table_entry_handler hand
>  int acpi_parse_mcfg (struct acpi_table_header *header);
>  void acpi_table_print_madt_entry (struct acpi_subtable_header *madt);
>  
> -/* the following four functions are architecture-dependent */
> +/* the following six functions are architecture-dependent */
>  void acpi_numa_slit_init (struct acpi_table_slit *slit);
>  void acpi_numa_processor_affinity_init (struct acpi_srat_cpu_affinity *pa);
>  void acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa);
>  void acpi_numa_memory_affinity_init (struct acpi_srat_mem_affinity *ma);
>  void acpi_numa_arch_fixup(void);
> +void acpi_numa_print_srat_mapping(void);
>  
>  #ifdef CONFIG_ACPI_HOTPLUG_CPU
>  /* Arch dependent functions for cpu hotplug support */
--
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