Message-Id: <20060926203925.ee98a4ae.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 26 Sep 2006 20:39:25 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"bibo,mao" <bibo.mao@...el.com>
Cc:	tony.luck@...el.com, akpm@...l.org, linux-ia64@...r.kernel.org,
	linux-kernel@...r.kernel.org, y-goto@...fujitsu.com
Subject: Re: [BUGFIX][PATCH] cpu to node relationship fixup take2 [2/2] map
 cpu to node

On Tue, 26 Sep 2006 19:23:05 +0800
"bibo,mao" <bibo.mao@...el.com> wrote:

> KAMEZAWA Hiroyuki wrote:
> > Assume that a cpu is *physically* offlined at boot time...
> > 
> > Because smpboot.c::smp_boot_cpu_map() canoot find cpu's sapicid,
> > numa.c::build_cpu_to_node_map() cannot build cpu<->node map for
> > offlined cpu.
> > 
> > For such cpus, cpu_to_node map should be fixed at cpu-hot-add.
> > This mapping should be done before cpu onlining.
> > 
> > This patch also handles cpu hotremove case.
> > 
> > Signed-Off-By: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> > 
> > 
> >  arch/ia64/kernel/numa.c     |   34 +++++++++++++++++++++++++++++++---
> >  arch/ia64/kernel/topology.c |    6 +++++-
> >  include/asm-ia64/numa.h     |    4 ++++
> >  3 files changed, 40 insertions(+), 4 deletions(-)
> > 
> > Index: linux-2.6.18/arch/ia64/kernel/numa.c
> > ===================================================================
> > --- linux-2.6.18.orig/arch/ia64/kernel/numa.c	2006-09-22 14:22:44.000000000 +0900
> > +++ linux-2.6.18/arch/ia64/kernel/numa.c	2006-09-22 14:44:46.000000000 +0900
> > @@ -29,6 +29,36 @@
> >  
> >  cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned;
> >  
> > +void __cpuinit map_cpu_to_node(int cpu, int nid)
> > +{
> > +	int oldnid;
> > +	if (nid < 0) { /* just initialize by zero */
> > +		cpu_to_node_map[cpu] = 0;
> > +		return;
> > +	}
> > +	/* sanity check first */
> > +	oldnid = cpu_to_node_map[cpu];
> > +	if (cpu_isset(cpu, node_to_cpu_mask[oldnid])) {
> > +		return; /* nothing to do */
> > +	}
> > +	/* we don't have cpu-driven node hot add yet...
> > +	   In usual case, node is created from SRAT at boot time. */
> > +	if (!node_online(nid))
> > +		nid = first_online_node;
> > +	cpu_to_node_map[cpu] = nid;
> > +	cpu_set(cpu, node_to_cpu_mask[nid]);
> > +	return;
> > +}
> > +
> > +void __cpuinit unmap_cpu_from_node(int cpu, int nid)
> > +{
> > +	WARN_ON(!cpu_isset(cpu, node_to_cpu_mask[nid]));
> > +	WARN_ON(cpu_to_node_map[cpu] != nid);
> > +	cpu_to_node_map[cpu] = 0;
> > +	cpu_clear(cpu, node_to_cpu_mask[nid]);
> > +}
> > +
> > +
> >  /**
> >   * build_cpu_to_node_map - setup cpu to node and node to cpumask arrays
> >   *
> > @@ -49,8 +79,6 @@
> >  				node = node_cpuid[i].nid;
> >  				break;
> >  			}
> > -		cpu_to_node_map[cpu] = (node >= 0) ? node : 0;
> > -		if (node >= 0)
> > -			cpu_set(cpu, node_to_cpu_mask[node]);
> > +		map_cpu_to_node(cpu, node);
> >  	}
> >  }
> > Index: linux-2.6.18/include/asm-ia64/numa.h
> > ===================================================================
> > --- linux-2.6.18.orig/include/asm-ia64/numa.h	2006-09-22 14:22:44.000000000 +0900
> > +++ linux-2.6.18/include/asm-ia64/numa.h	2006-09-22 14:25:07.000000000 +0900
> > @@ -64,6 +64,10 @@
> >  
> >  #define local_nodeid (cpu_to_node_map[smp_processor_id()])
> >  
> > +extern void map_cpu_to_node(int cpu, int nid);
> > +extern void unmap_cpu_from_node(int cpu, int nid);
> > +
> > +
> >  #else /* !CONFIG_NUMA */
> >  
> >  #define paddr_to_nid(addr)	0
> > Index: linux-2.6.18/arch/ia64/kernel/topology.c
> > ===================================================================
> > --- linux-2.6.18.orig/arch/ia64/kernel/topology.c	2006-09-22 14:22:44.000000000 +0900
> > +++ linux-2.6.18/arch/ia64/kernel/topology.c	2006-09-22 14:25:07.000000000 +0900
> > @@ -36,6 +36,9 @@
> >  	 */
> >  	if (!can_cpei_retarget() && is_cpu_cpei_target(num))
> >  		sysfs_cpus[num].cpu.no_control = 1;
> > +#ifdef CONFIG_NUMA
> > +	map_cpu_to_node(num, node_cpuid[num].nid);
> > +#endif
> >  #endif
> >  
> >  	return register_cpu(&sysfs_cpus[num].cpu, num);
> > @@ -45,7 +48,8 @@
> >  
> >  void arch_unregister_cpu(int num)
> >  {
> > -	return unregister_cpu(&sysfs_cpus[num].cpu);
> > +	unregister_cpu(&sysfs_cpus[num].cpu);
> > +	unmap_cpu_from_node(num, cpu_to_node(num));
> This patch failed to compile in my IA64 box, my machine is not NUMA machine,
> there is unmap_cpu_from_node not defined error like this.
> 
> arch/ia64/kernel/built-in.o: In function `arch_unregister_cpu':
> arch/ia64/kernel/topology.c:52: undefined reference to `unmap_cpu_from_node'
> make: *** [.tmp_vmlinux1] Error 1
> 
> thanks
> bibo,mao
> 

Uh... sorry. How about this hot-fix ?

-Kame
=========


Non-NUMA case should be handled...

Signed-Off-By: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Index: linux-2.6.18/arch/ia64/kernel/topology.c
===================================================================
--- linux-2.6.18.orig/arch/ia64/kernel/topology.c	2006-09-26 20:31:25.000000000 +0900
+++ linux-2.6.18/arch/ia64/kernel/topology.c	2006-09-26 20:34:03.000000000 +0900
@@ -36,10 +36,8 @@
 	 */
 	if (!can_cpei_retarget() && is_cpu_cpei_target(num))
 		sysfs_cpus[num].cpu.no_control = 1;
-#ifdef CONFIG_NUMA
 	map_cpu_to_node(num, node_cpuid[num].nid);
 #endif
-#endif
 
 	return register_cpu(&sysfs_cpus[num].cpu, num);
 }
Index: linux-2.6.18/include/asm-ia64/numa.h
===================================================================
--- linux-2.6.18.orig/include/asm-ia64/numa.h	2006-09-26 20:31:25.000000000 +0900
+++ linux-2.6.18/include/asm-ia64/numa.h	2006-09-26 20:33:49.000000000 +0900
@@ -69,6 +69,8 @@
 
 
 #else /* !CONFIG_NUMA */
+#define map_cpu_to_node(cpu, nid)	do{}while(0)
+#define unmap_cpu_from_node(cpu, nid)	do{}while(0)
 
 #define paddr_to_nid(addr)	0
 





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