LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: David Hildenbrand <david@redhat.com>
To: Faiyaz Mohammed <faiyazm@codeaurora.org>,
	akpm@linux-foundation.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Cc: guptap@codeaurora.org
Subject: Re: [PATCH v1] mm: page_alloc: Add debug log in free_reserved_area for static memory
Date: Tue, 28 Sep 2021 12:39:19 +0200	[thread overview]
Message-ID: <248ec931-7c16-3e2d-cc8f-8ce0dd4e923b@redhat.com> (raw)
In-Reply-To: <1632819849-511-1-git-send-email-faiyazm@codeaurora.org>

On 28.09.21 11:04, Faiyaz Mohammed wrote:
> 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 memblock_dbg log in "free_reserved_area".
> After adding log:
> [    0.294837] memblock_free: [0x00000083600000-0x00000083603000] free_initrd_mem+0x20/0x28
> [    0.294848] Freeing initrd memory: 12K.
> [    0.695246] memblock_free: [0x00000081600000-0x00000081a00000] free_initmem+0x70/0xc8
> [    0.696688] Freeing unused kernel memory: 4096K.
> 
> Signed-off-by: Faiyaz Mohammed <faiyazm@codeaurora.org>
> ---
>   mm/page_alloc.c | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index b37435c..f85c3b2 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -8129,6 +8129,11 @@ unsigned long free_reserved_area(void *start, void *end, int poison, const char
>   		pr_info("Freeing %s memory: %ldK\n",
>   			s, pages << (PAGE_SHIFT - 10));
>   
> +#ifdef CONFIG_HAVE_MEMBLOCK
> +		memblock_dbg("memblock_free: [%#016llx-%#016llx] %pS\n",
> +			__pa(start), __pa(end), (void *)_RET_IP_);
> +#endif

IMHO, the "memblock_free" part is misleading. Something was allocated 
early via memblock, then we transitioned to the buddy, now we're freeing 
that early allocation via the buddy.

I would not expect memblock_dbg once memblock might not actually be 
alive anymore.

-- 
Thanks,

David / dhildenb


  reply	other threads:[~2021-09-28 10:39 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-28  9:04 Faiyaz Mohammed
2021-09-28 10:39 ` David Hildenbrand [this message]
2021-09-28 10:53   ` Faiyaz Mohammed
2021-09-28 11:16     ` David Hildenbrand
2021-09-29  8:58       ` Faiyaz Mohammed
2021-09-29 17:03         ` David Hildenbrand
2021-10-06 12:13           ` Faiyaz Mohammed
2021-10-06 12:18             ` David Hildenbrand
2021-10-06 14:22               ` Faiyaz Mohammed
2021-10-11  6:49               ` Faiyaz Mohammed

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=248ec931-7c16-3e2d-cc8f-8ce0dd4e923b@redhat.com \
    --to=david@redhat.com \
    --cc=akpm@linux-foundation.org \
    --cc=faiyazm@codeaurora.org \
    --cc=guptap@codeaurora.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --subject='Re: [PATCH v1] mm: page_alloc: Add debug log in free_reserved_area for static memory' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).