linux-kernel - Re: [PATCH] memblock: Add flags and nid info in memblock debugfs

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Message-ID: <CALJQGLmmgTA17d5FJ3R-EVurWg+rK8y05CXeON4SBRKe3kEmfw@mail.gmail.com>
Date:   Wed, 17 May 2023 09:52:17 +0800
From:   Yuwei Guan <ssawgyw@...il.com>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] memblock: Add flags and nid info in memblock debugfs

Mike Rapoport <rppt@...nel.org> 于2023年5月16日周二 22:10写道：
>
> Hi,
>
> On Tue, May 16, 2023 at 10:06:45AM +0800, 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,
> > 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     flags   base..end
> > 0:      0x0     0x0000000080000000..0x00000000901fffff
> > 1:      0x4     0x0000000090200000..0x00000000905fffff
> > 2:      0x0     0x0000000090600000..0x0000000092ffffff
> > 3:      0x4     0x0000000093000000..0x00000000973fffff
> > 4:      0x0     0x0000000097400000..0x00000000b71fffff
> > 5:      0x0     0x00000000c0000000..0x00000000dfffffff
> > 6:      0x0     0x00000000e2500000..0x00000000f87fffff
> > 7:      0x4     0x00000000f8800000..0x00000000fa7fffff
> > 8:      0x0     0x00000000fa800000..0x00000000fd3effff
> > 9:      0x4     0x00000000fd3f0000..0x00000000fd3fefff
> > 10:     0x0     0x00000000fd3ff000..0x00000000fd7fffff
> > 11:     0x4     0x00000000fd800000..0x00000000fd901fff
> > 12:     0x0     0x00000000fd902000..0x00000000fd909fff
> > 13:     0x4     0x00000000fd90a000..0x00000000fd90bfff
> > 14:     0x0     0x00000000fd90c000..0x00000000ffffffff
> > 15:     0x0     0x0000000880000000..0x0000000affffffff
> >
> > Signed-off-by: Yuwei Guan <ssawgyw@...il.com>
> > ---
> >  mm/memblock.c | 12 +++++++++++-
> >  1 file changed, 11 insertions(+), 1 deletion(-)
> >
> > diff --git a/mm/memblock.c b/mm/memblock.c
> > index 45f198750be9..34230b258e21 100644
> > --- a/mm/memblock.c
> > +++ b/mm/memblock.c
> > @@ -2045,11 +2045,21 @@ static int memblock_debug_show(struct seq_file *m, void *private)
> >       int i;
> >       phys_addr_t end;
> >
> > +#ifdef CONFIG_NUMA
> > +     seq_puts(m, "cnt\tflags\tnid\tbase..end\n");
> > +#else
> > +     seq_puts(m, "cnt\tflags\tbase..end\n");
> > +#endif
> > +
> >       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, "%d:\t", i);
> > +             seq_printf(m, "0x%x\t", reg->flags);
> > +#ifdef CONFIG_NUMA
> > +             seq_printf(m, "0x%x\t", reg->nid);
> > +#endif
>
> Please add flags and node information after the ranges and print node for
> UMA case as well. I'd prefer to have zeros in debugfs rather than ifdefs
> here. Just use memblock_get_region_node() instead of r->nid.
>

Thanks for the code review. I will update it and send a v2 patch.

> >               seq_printf(m, "%pa..%pa\n", &reg->base, &end);
> >       }
> >       return 0;
> > --
> > 2.34.1
> >
>
> --
> Sincerely yours,
> Mike.