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

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Message-ID: <87ilcsr367.fsf@linux.ibm.com>
Date:   Tue, 16 May 2023 15:47:20 +0530
From:   Tarun Sahu <jjs.tarun@...il.com>
To:     Yuwei Guan <ssawgyw@...il.com>, rppt@...nel.org,
        akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Yuwei Guan <ssawgyw@...il.com>, aneesh.kumar@...ux.ibm.com
Subject: Re: [PATCH] memblock: Add flags and nid info in memblock debugfs

Hi Guan,

Looks good to me, I tested it on my system.
Feel free to add

Reviewed-by: Tarun Sahu <tsahu@...ux.ibm.com>

Yuwei Guan <ssawgyw@...il.com> writes:

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