Mike Rapoport <rppt@xxxxxxxxxx> 于2023年5月17日周三 21:42写道：
>
> On Wed, May 17, 2023 at 11:37:25AM +0530, Anshuman Khandual wrote:
> >
> > On 5/17/23 08:27, Yuwei Guan wrote:
> > > Currently, the memblock debugfs can display the count of memblock_type and
> > > the base and end of the reg. However, when the following scenario occurs,
> >
> > scenarios where the memblock flags or nid varies inside a single PA range ?
> > I guess the commit message description here can be improved to accommodate
> > such details.
> >
> > > the information in the existing debugfs cannot make it clear why the
> > > address is not consecutive.
> > >
> > > For example,
> > > cat /sys/kernel/debug/memblock/memory
> > > 0: 0x0000000080000000..0x00000000901fffff
> > > 1: 0x0000000090200000..0x00000000905fffff
> > > 2: 0x0000000090600000..0x0000000092ffffff
> > > 3: 0x0000000093000000..0x00000000973fffff
> > > 4: 0x0000000097400000..0x00000000b71fffff
> > > 5: 0x00000000c0000000..0x00000000dfffffff
> > > 6: 0x00000000e2500000..0x00000000f87fffff
> > > 7: 0x00000000f8800000..0x00000000fa7fffff
> > > 8: 0x00000000fa800000..0x00000000fd3effff
> > > 9: 0x00000000fd3f0000..0x00000000fd3fefff
> > > 10: 0x00000000fd3ff000..0x00000000fd7fffff
> > > 11: 0x00000000fd800000..0x00000000fd901fff
> > > 12: 0x00000000fd902000..0x00000000fd909fff
> > > 13: 0x00000000fd90a000..0x00000000fd90bfff
> > > 14: 0x00000000fd90c000..0x00000000ffffffff
> > > 15: 0x0000000880000000..0x0000000affffffff
> > >
> > > So we can add flags and nid to this debugfs.
> > >
> > > For example,
> > > cat /sys/kernel/debug/memblock/memory
> > > cnt base..end flags nid
> >
> > These markers ^^^ are not aligned properly, and also might not be
> > required as well.
> >
> > > 0: 0x0000000080000000..0x00000000901fffff 0x0 0x0
> > > 1: 0x0000000090200000..0x00000000905fffff 0x4 0x0
> > > 2: 0x0000000090600000..0x0000000092ffffff 0x0 0x0
> > > 3: 0x0000000093000000..0x00000000973fffff 0x4 0x0
> > > 4: 0x0000000097400000..0x00000000b71fffff 0x0 0x0
> > > 5: 0x00000000c0000000..0x00000000dfffffff 0x0 0x0
> > > 6: 0x00000000e2500000..0x00000000f87fffff 0x0 0x0
> > > 7: 0x00000000f8800000..0x00000000fa7fffff 0x4 0x0
> > > 8: 0x00000000fa800000..0x00000000fd3effff 0x0 0x0
> > > 9: 0x00000000fd3f0000..0x00000000fd3fefff 0x4 0x0
> > > 10: 0x00000000fd3ff000..0x00000000fd7fffff 0x0 0x0
> > > 11: 0x00000000fd800000..0x00000000fd901fff 0x4 0x0
> > > 12: 0x00000000fd902000..0x00000000fd909fff 0x0 0x0
> > > 13: 0x00000000fd90a000..0x00000000fd90bfff 0x4 0x0
> > > 14: 0x00000000fd90c000..0x00000000ffffffff 0x0 0x0
> > > 15: 0x0000000880000000..0x0000000affffffff 0x0 0x0
> > >
> > > Signed-off-by: Yuwei Guan <ssawgyw@xxxxxxxxx>
> > > Reviewed-by: Tarun Sahu <tsahu@xxxxxxxxxxxxx>
> > > ---
> > > mm/memblock.c | 8 ++++++--
> > > 1 file changed, 6 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/mm/memblock.c b/mm/memblock.c
> > > index 511d4783dcf1..b36fb6b31e0f 100644
> > > --- a/mm/memblock.c
> > > +++ b/mm/memblock.c
> > > @@ -2144,12 +2144,16 @@ static int memblock_debug_show(struct seq_file *m, void *private)
> > > int i;
> > > phys_addr_t end;
> > >
> > > + seq_puts(m, "cnt\tbase..end\tflags\tnid\n");
> >
> > Please drop this.
> >
> > > +
> > > for (i = 0; i < type->cnt; i++) {
> > > reg = &type->regions[i];
> > > end = reg->base + reg->size - 1;
> > >
> > > - seq_printf(m, "%4d: ", i);
> > > - seq_printf(m, "%pa..%pa\n", ®->base, &end);
> > > + seq_printf(m, "%d:\t", i);
> >
> > Why drop the existing %4d formatting qualifier ?
> >
> > > + seq_printf(m, "%pa..%pa\t", ®->base, &end);
> > > + seq_printf(m, "0x%x\t", reg->flags);
> >
> > Should there be ORed string values for each memblock flag ?
> >
> > enum memblock_flags {
> > MEMBLOCK_NONE = 0x0, /* No special request */
> > MEMBLOCK_HOTPLUG = 0x1, /* hotpluggable region */
> > MEMBLOCK_MIRROR = 0x2, /* mirrored region */
> > MEMBLOCK_NOMAP = 0x4, /* don't add to kernel direct mapping */
> > MEMBLOCK_DRIVER_MANAGED = 0x8, /* always detected via a driver */
> > };
> >
> > Something like NN | HT | MR | NM | DM ?
>
> These are not less cryptic than numbers :)
> Most of them are mutually exclusive, so maybe just spell them out fully,
> just shorten DRIVER_MANAGED to DRV_MNG?
> And make the flags dump the last to keep columns nicely aligned.
>
Ok, I will update them in the v3 patch soon.
Thanks
> > > + seq_printf(m, "0x%x\n", memblock_get_region_node(reg));
> > > }
> > > return 0;
> > > }
>
> --
> Sincerely yours,
> Mike.
