[v3,2/2] memory: hmp: add "-f" for "info mtree"

Adding one more option "-f" for "info mtree" to dump the flat views of
all the address spaces.

This will be useful to debug the memory rendering logic, also it'll be
much easier with it to know what memory region is handling what address
range.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 hmp-commands-info.hx  |  6 +++---
 include/exec/memory.h |  2 +-
 memory.c              | 40 +++++++++++++++++++++++++++++++++++++++-
 monitor.c             |  4 +++-
 4 files changed, 46 insertions(+), 6 deletions(-)

* Peter Xu (peterx@redhat.com) wrote:
> Adding one more option "-f" for "info mtree" to dump the flat views of
> all the address spaces.
> 
> This will be useful to debug the memory rendering logic, also it'll be
> much easier with it to know what memory region is handling what address
> range.
> 
> Signed-off-by: Peter Xu <peterx@redhat.com>
> ---
>  hmp-commands-info.hx  |  6 +++---
>  include/exec/memory.h |  2 +-
>  memory.c              | 40 +++++++++++++++++++++++++++++++++++++++-
>  monitor.c             |  4 +++-
>  4 files changed, 46 insertions(+), 6 deletions(-)
> 
> diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx
> index 55d50c4..b0f35e6 100644
> --- a/hmp-commands-info.hx
> +++ b/hmp-commands-info.hx
> @@ -249,9 +249,9 @@ ETEXI
>  
>      {
>          .name       = "mtree",
> -        .args_type  = "",
> -        .params     = "",
> -        .help       = "show memory tree",
> +        .args_type  = "flatview:-f",
> +        .params     = "[-f]",
> +        .help       = "show memory tree (-f: dump flat view for address spaces)",
>          .cmd        = hmp_info_mtree,
>      },
>  
> diff --git a/include/exec/memory.h b/include/exec/memory.h
> index bec9756..71db380 100644
> --- a/include/exec/memory.h
> +++ b/include/exec/memory.h
> @@ -1254,7 +1254,7 @@ void memory_global_dirty_log_start(void);
>   */
>  void memory_global_dirty_log_stop(void);
>  
> -void mtree_info(fprintf_function mon_printf, void *f);
> +void mtree_info(fprintf_function mon_printf, void *f, bool flatview);
>  
>  /**
>   * memory_region_dispatch_read: perform a read directly to the specified
> diff --git a/memory.c b/memory.c
> index c42bde4..25f1c25 100644
> --- a/memory.c
> +++ b/memory.c
> @@ -2564,12 +2564,50 @@ static void mtree_print_mr(fprintf_function mon_printf, void *f,
>      }
>  }
>  
> -void mtree_info(fprintf_function mon_printf, void *f)
> +static void mtree_print_flatview(fprintf_function p, void *f,
> +                                 AddressSpace *as)
> +{
> +    FlatView *view = address_space_get_flatview(as);
> +    FlatRange *range = &view->ranges[0];
> +    MemoryRegion *mr;
> +    int n = view->nr;
> +
> +    if (n <= 0) {
> +        p(f, MTREE_INDENT "No rendered FlatView for "
> +          "address space '%s'\n", as->name);

Do you need an unref there?

Dave

> +        return;
> +    }
> +
> +    while (n--) {
> +        mr = range->mr;
> +        p(f, MTREE_INDENT TARGET_FMT_plx "-"
> +          TARGET_FMT_plx " (prio %d, %s): %s\n",
> +          int128_get64(range->addr.start),
> +          int128_get64(range->addr.start) + MR_SIZE(range->addr.size),
> +          mr->priority,
> +          memory_region_type(mr),
> +          memory_region_name(mr));
> +        range++;
> +    }
> +
> +    flatview_unref(view);
> +}
> +
> +void mtree_info(fprintf_function mon_printf, void *f, bool flatview)
>  {
>      MemoryRegionListHead ml_head;
>      MemoryRegionList *ml, *ml2;
>      AddressSpace *as;
>  
> +    if (flatview) {
> +        QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
> +            mon_printf(f, "address-space (flat view): %s\n", as->name);
> +            mtree_print_flatview(mon_printf, f, as);
> +            mon_printf(f, "\n");
> +        }
> +        return;
> +    }
> +
>      QTAILQ_INIT(&ml_head);
>  
>      QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
> diff --git a/monitor.c b/monitor.c
> index 0841d43..679cd52 100644
> --- a/monitor.c
> +++ b/monitor.c
> @@ -1529,7 +1529,9 @@ static void hmp_boot_set(Monitor *mon, const QDict *qdict)
>  
>  static void hmp_info_mtree(Monitor *mon, const QDict *qdict)
>  {
> -    mtree_info((fprintf_function)monitor_printf, mon);
> +    bool flatview = qdict_get_try_bool(qdict, "flatview", false);
> +
> +    mtree_info((fprintf_function)monitor_printf, mon, flatview);
>  }
>  
>  static void hmp_info_numa(Monitor *mon, const QDict *qdict)
> -- 
> 2.7.4
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK

On Fri, Jan 13, 2017 at 06:19:10PM +0000, Dr. David Alan Gilbert wrote:

[...]

> > -void mtree_info(fprintf_function mon_printf, void *f)
> > +static void mtree_print_flatview(fprintf_function p, void *f,
> > +                                 AddressSpace *as)
> > +{
> > +    FlatView *view = address_space_get_flatview(as);
> > +    FlatRange *range = &view->ranges[0];
> > +    MemoryRegion *mr;
> > +    int n = view->nr;
> > +
> > +    if (n <= 0) {
> > +        p(f, MTREE_INDENT "No rendered FlatView for "
> > +          "address space '%s'\n", as->name);
> 
> Do you need an unref there?

Definitely. Thanks!

-- peterx