2021-10-11 07:07:38

by Faiyaz Mohammed

Subject: [PATCH v2] mm: page_alloc: Add debug log in free_reserved_area for static memory

From: Faiyaz Mohammed <[email protected]>

For INITRD and initmem memory is reserved through "memblock_reserve"
during boot up but it is free via "free_reserved_area" instead
of "memblock_free".
For example:
[ 0.294848] Freeing initrd memory: 12K.
[ 0.696688] Freeing unused kernel memory: 4096K.

To get the start and end address of the above freed memory and to account
proper memblock added pr_debug log in "free_reserved_area".
After adding log:
[ 0.294837] 0x00000083600000-0x00000083603000 free_initrd_mem+0x20/0x28
[ 0.294848] Freeing initrd memory: 12K.
[ 0.695246] 0x00000081600000-0x00000081a00000 free_initmem+0x70/0xc8
[ 0.696688] Freeing unused kernel memory: 4096K.

Signed-off-by: Faiyaz Mohammed <[email protected]>
---
mm/page_alloc.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 668edb1..8a1929d4 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -8153,6 +8153,11 @@ unsigned long free_reserved_area(void *start, void *end, int poison, const char
if (pages && s)
pr_info("Freeing %s memory: %ldK\n", s, K(pages));

+#ifdef CONFIG_HAVE_MEMBLOCK
+ memblock_dbg("memblock_free: [%#016llx-%#016llx] %pS\n",
+ __pa(start), __pa(end), (void *)_RET_IP_);
+#endif
+
return pages;
}

--
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2021-10-11 11:28:11

by Faiyaz Mohammed

Subject: Re: [PATCH v2] mm: page_alloc: Add debug log in free_reserved_area for static memory

Please ignore this patch.

On 10/11/2021 12:25 PM, Faiyaz Mohammed wrote:
> From: Faiyaz Mohammed <[email protected]>
>
> For INITRD and initmem memory is reserved through "memblock_reserve"
> during boot up but it is free via "free_reserved_area" instead
> of "memblock_free".
> For example:
> [ 0.294848] Freeing initrd memory: 12K.
> [ 0.696688] Freeing unused kernel memory: 4096K.
>
> To get the start and end address of the above freed memory and to account
> proper memblock added pr_debug log in "free_reserved_area".
> After adding log:
> [ 0.294837] 0x00000083600000-0x00000083603000 free_initrd_mem+0x20/0x28
> [ 0.294848] Freeing initrd memory: 12K.
> [ 0.695246] 0x00000081600000-0x00000081a00000 free_initmem+0x70/0xc8
> [ 0.696688] Freeing unused kernel memory: 4096K.
>
> Signed-off-by: Faiyaz Mohammed <[email protected]>
> ---
> mm/page_alloc.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 668edb1..8a1929d4 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -8153,6 +8153,11 @@ unsigned long free_reserved_area(void *start, void *end, int poison, const char
> if (pages && s)
> pr_info("Freeing %s memory: %ldK\n", s, K(pages));
>
> +#ifdef CONFIG_HAVE_MEMBLOCK
> + memblock_dbg("memblock_free: [%#016llx-%#016llx] %pS\n",
> + __pa(start), __pa(end), (void *)_RET_IP_);
> +#endif
> +
> return pages;
> }
>
>