linux-kernel - Re: [PATCH 20/26] mm/sparse: Register information into meminspect

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Message-ID: <aVImuURq0FXsfsrp@kernel.org>
Date: Mon, 29 Dec 2025 08:59:05 +0200
From: Mike Rapoport <rppt@...nel.org>
To: Eugen Hristev <eugen.hristev@...aro.org>
Cc: linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, tglx@...utronix.de, andersson@...nel.org,
	pmladek@...e.com, rdunlap@...radead.org, corbet@....net,
	david@...hat.com, mhocko@...e.com, tudor.ambarus@...aro.org,
	mukesh.ojha@....qualcomm.com, linux-arm-kernel@...ts.infradead.org,
	linux-hardening@...r.kernel.org, jonechou@...gle.com,
	rostedt@...dmis.org, linux-doc@...r.kernel.org,
	devicetree@...r.kernel.org, linux-remoteproc@...r.kernel.org,
	linux-arch@...r.kernel.org, tony.luck@...el.com, kees@...nel.org
Subject: Re: [PATCH 20/26] mm/sparse: Register information into meminspect

Hi Eugen,

On Wed, Nov 19, 2025 at 05:44:21PM +0200, Eugen Hristev wrote:
> Annotate vital static information into meminspect:
>  - mem_section
> 
> Information on these variables is stored into inspection table.
> 
> Register dynamic information into meminspect:
>  - section
>  - mem_section_usage
> 
> This information is being allocated for each node, so call
> memblock_mark_inspect to mark the block accordingly.
> 
> Signed-off-by: Eugen Hristev <eugen.hristev@...aro.org>
> ---
>  mm/sparse.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/mm/sparse.c b/mm/sparse.c
> index 17c50a6415c2..80530e39c8b2 100644
> --- a/mm/sparse.c
> +++ b/mm/sparse.c
> @@ -15,6 +15,7 @@
>  #include <linux/swapops.h>
>  #include <linux/bootmem_info.h>
>  #include <linux/vmstat.h>
> +#include <linux/meminspect.h>
>  #include "internal.h"
>  #include <asm/dma.h>
>  
> @@ -30,6 +31,7 @@ struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT]
>  	____cacheline_internodealigned_in_smp;
>  #endif
>  EXPORT_SYMBOL(mem_section);
> +MEMINSPECT_SIMPLE_ENTRY(mem_section);
>  
>  #ifdef NODE_NOT_IN_PAGE_FLAGS
>  /*
> @@ -253,6 +255,7 @@ static void __init memblocks_present(void)
>  		size = sizeof(struct mem_section *) * NR_SECTION_ROOTS;
>  		align = 1 << (INTERNODE_CACHE_SHIFT);
>  		mem_section = memblock_alloc_or_panic(size, align);
> +		memblock_mark_inspect(virt_to_phys(mem_section), size);

Why not meminspect_register_va()?

>  	}
>  #endif
>  
> @@ -343,6 +346,7 @@ sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat,
>  		limit = MEMBLOCK_ALLOC_ACCESSIBLE;
>  		goto again;
>  	}
> +	memblock_mark_inspect(virt_to_phys(usage), size);
>  	return usage;
>  }
>  
> -- 
> 2.43.0
> 

-- 
Sincerely yours,
Mike.