Re: [Qemu-devel] [PATCH for-2.10 21/23] numa: remove node_cpu bitmaps as they are no longer used

[David Gibson]

On Wed, Mar 22, 2017 at 02:32:46PM +0100, Igor Mammedov wrote:
> Postfactum "CPU(s) present in multiple NUMA nodes" check
> was the last user of node_cpu bitmaps, but it's not need
> as machine_set_cpu_numa_node() does the similar check at
> the time mapping is set for cpus (i.e. when -numa cpus=
> is parsed) and ensures that cpu can be mapped only to
> one node.
> 
> Remove duplicate check based on node_cpu bitmaps and
> since the last user is gone remove node_cpu as well,
> which completes internal transition from legacy bitmap
> based mapping storage to possible_cpus storage.
> 
> Signed-off-by: Igor Mammedov <address@hidden>

Reviewed-by: David Gibson <address@hidden>

> ---
>  include/sysemu/numa.h |  1 -
>  numa.c                | 42 ------------------------------------------
>  2 files changed, 43 deletions(-)
> 
> diff --git a/include/sysemu/numa.h b/include/sysemu/numa.h
> index 345bb94..796ee94 100644
> --- a/include/sysemu/numa.h
> +++ b/include/sysemu/numa.h
> @@ -17,7 +17,6 @@ struct numa_addr_range {
>  
>  typedef struct node_info {
>      uint64_t node_mem;
> -    unsigned long *node_cpu;
>      struct HostMemoryBackend *node_memdev;
>      bool present;
>      QLIST_HEAD(, numa_addr_range) addr; /* List to store address ranges */
> diff --git a/numa.c b/numa.c
> index 523558f..088fae3 100644
> --- a/numa.c
> +++ b/numa.c
> @@ -177,7 +177,6 @@ static void numa_node_parse(MachineState *ms, 
> NumaNodeOptions *node,
>                         cpus->value, max_cpus);
>              return;
>          }
> -        bitmap_set(numa_info[nodenr].node_cpu, cpus->value, 1);
>          props = mc->cpu_index_to_instance_props(ms, cpus->value);
>          props.node_id = nodenr;
>          props.has_node_id = true;
> @@ -261,51 +260,12 @@ end:
>      return 0;
>  }
>  
> -static char *enumerate_cpus(unsigned long *cpus, int max_cpus)
> -{
> -    int cpu;
> -    bool first = true;
> -    GString *s = g_string_new(NULL);
> -
> -    for (cpu = find_first_bit(cpus, max_cpus);
> -        cpu < max_cpus;
> -        cpu = find_next_bit(cpus, max_cpus, cpu + 1)) {
> -        g_string_append_printf(s, "%s%d", first ? "" : " ", cpu);
> -        first = false;
> -    }
> -    return g_string_free(s, FALSE);
> -}
> -
> -static void validate_numa_cpus(void)
> -{
> -    int i;
> -    unsigned long *seen_cpus = bitmap_new(max_cpus);
> -
> -    for (i = 0; i < nb_numa_nodes; i++) {
> -        if (bitmap_intersects(seen_cpus, numa_info[i].node_cpu, max_cpus)) {
> -            bitmap_and(seen_cpus, seen_cpus,
> -                       numa_info[i].node_cpu, max_cpus);
> -            error_report("CPU(s) present in multiple NUMA nodes: %s",
> -                         enumerate_cpus(seen_cpus, max_cpus));
> -            g_free(seen_cpus);
> -            exit(EXIT_FAILURE);
> -        }
> -        bitmap_or(seen_cpus, seen_cpus,
> -                  numa_info[i].node_cpu, max_cpus);
> -    }
> -    g_free(seen_cpus);
> -}
> -
>  void parse_numa_opts(MachineState *ms)
>  {
>      int i;
>      const CPUArchIdList *possible_cpus;
>      MachineClass *mc = MACHINE_GET_CLASS(ms);
>  
> -    for (i = 0; i < MAX_NODES; i++) {
> -        numa_info[i].node_cpu = bitmap_new(max_cpus);
> -    }
> -
>      if (qemu_opts_foreach(qemu_find_opts("numa"), parse_numa, ms, NULL)) {
>          exit(1);
>      }
> @@ -397,12 +357,10 @@ void parse_numa_opts(MachineState *ms)
>                  props = mc->cpu_index_to_instance_props(ms, i);
>                  props.has_node_id = true;
>  
> -                set_bit(i, numa_info[props.node_id].node_cpu);
>                  machine_set_cpu_numa_node(ms, &props, &error_fatal);
>              }
>          }
>  
> -        validate_numa_cpus();
>      } else {
>          numa_set_mem_node_id(0, ram_size, 0);
>      }

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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