Re: [Qemu-devel] [PATCH qemu v2 09/13] memory: Rename mem_begin/mem_commit/mem_add helpers

[Paolo Bonzini <pbonzini@redhat.com>]

On 15/09/2017 10:40, Alexey Kardashevskiy wrote:
> This renames some helper to reflect better what they do.
> 
> This drops AS in address_space_update_flatview() as it is not used anymore
> and renames to flatview_render_new().
> 
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
> ---
>  include/exec/memory-internal.h |  6 +++---
>  exec.c                         |  7 +++----
>  memory.c                       | 14 ++++++--------
>  3 files changed, 12 insertions(+), 15 deletions(-)
> 
> diff --git a/include/exec/memory-internal.h b/include/exec/memory-internal.h
> index c8a5522510..e87a30fcae 100644
> --- a/include/exec/memory-internal.h
> +++ b/include/exec/memory-internal.h
> @@ -28,9 +28,9 @@ extern const MemoryRegionOps unassigned_mem_ops;
>  bool memory_region_access_valid(MemoryRegion *mr, hwaddr addr,
>                                  unsigned size, bool is_write);
>  
> -void mem_add(FlatView *fv, MemoryRegionSection *section);
> -AddressSpaceDispatch *mem_begin(AddressSpace *as);
> -void mem_commit(AddressSpaceDispatch *d);
> +void flatview_mem_add(FlatView *fv, MemoryRegionSection *section);

Maybe flatview_add_to_dispatch?

> +AddressSpaceDispatch *address_space_dispatch_alloc(FlatView *fv);
> +void address_space_dispatch_compact(AddressSpaceDispatch *d);

phys_page_compact_all does not use nodes_nb so you can just remove the
indirection and rename phys_page_compact_all to
address_space_dispatch_compact.

>  AddressSpaceDispatch *address_space_to_dispatch(AddressSpace *as);
>  AddressSpaceDispatch *flatview_to_dispatch(FlatView *fv);
> diff --git a/exec.c b/exec.c
> index 3e02b82c05..11e0e3c927 100644
> --- a/exec.c
> +++ b/exec.c
> @@ -1347,7 +1347,7 @@ static void register_multipage(FlatView *fv,
>      phys_page_set(d, start_addr >> TARGET_PAGE_BITS, num_pages, section_index);
>  }
>  
> -void mem_add(FlatView *fv, MemoryRegionSection *section)
> +void flatview_mem_add(FlatView *fv, MemoryRegionSection *section)
>  {
>      MemoryRegionSection now = *section, remain = *section;
>      Int128 page_size = int128_make64(TARGET_PAGE_SIZE);
> @@ -2673,9 +2673,8 @@ static void io_mem_init(void)
>                            NULL, UINT64_MAX);
>  }
>  
> -AddressSpaceDispatch *mem_begin(AddressSpace *as)
> +AddressSpaceDispatch *address_space_dispatch_alloc(FlatView *fv)
>  {
> -    FlatView *fv = address_space_to_flatview(as);
>      AddressSpaceDispatch *d = g_new0(AddressSpaceDispatch, 1);
>      uint16_t n;
>  
> @@ -2699,7 +2698,7 @@ void address_space_dispatch_free(AddressSpaceDispatch *d)
>      g_free(d);
>  }
>  
> -void mem_commit(AddressSpaceDispatch *d)
> +void address_space_dispatch_compact(AddressSpaceDispatch *d)
>  {
>      phys_page_compact_all(d, d->map.nodes_nb);
>  }
> diff --git a/memory.c b/memory.c
> index 0f51445d30..0651be49ac 100644
> --- a/memory.c
> +++ b/memory.c
> @@ -900,14 +900,12 @@ static void address_space_update_topology_pass(AddressSpace *as,
>      }
>  }
>  
> -static void address_space_update_flatview(AddressSpace *as,
> -                                          FlatView *old_view,
> -                                          FlatView *new_view)
> +static void flatview_render_new(FlatView *old_view, FlatView *new_view)

According to the remark in patch 3, old_view is not needed here (which
makes sense since each AddressSpaceDispatch is rebuilt from scratch).

Thanks,

Paolo

>  {
>      unsigned iold, inew;
>      FlatRange *frold, *frnew;
>  
> -    new_view->dispatch = mem_begin(as);
> +    new_view->dispatch = address_space_dispatch_alloc(new_view);
>      /*
>       * FIXME: this is cut-n-paste from address_space_update_topology_pass,
>       * simplify it
> @@ -935,7 +933,7 @@ static void address_space_update_flatview(AddressSpace *as,
>              /* In both and unchanged (except logging may have changed) */
>              MemoryRegionSection mrs = section_from_flat_range(frnew, new_view);
>  
> -            mem_add(new_view, &mrs);
> +            flatview_mem_add(new_view, &mrs);
>  
>              ++iold;
>              ++inew;
> @@ -943,12 +941,12 @@ static void address_space_update_flatview(AddressSpace *as,
>              /* In new */
>              MemoryRegionSection mrs = section_from_flat_range(frnew, new_view);
>  
> -            mem_add(new_view, &mrs);
> +            flatview_mem_add(new_view, &mrs);
>  
>              ++inew;
>          }
>      }
> -    mem_commit(new_view->dispatch);
> +    address_space_dispatch_compact(new_view->dispatch);
>  }
>  
>  static void address_space_update_topology(AddressSpace *as)
> @@ -956,7 +954,7 @@ static void address_space_update_topology(AddressSpace *as)
>      FlatView *old_view = address_space_get_flatview(as);
>      FlatView *new_view = generate_memory_topology(as->root);
>  
> -    address_space_update_flatview(as, old_view, new_view);
> +    flatview_render_new(old_view, new_view);
>      address_space_update_topology_pass(as, old_view, new_view, false);
>      address_space_update_topology_pass(as, old_view, new_view, true);
>  
>