linux-kernel - Re: [PATCH v3 1/2] mm/show_mem: Dump the status of the mem alloc profiling before printing

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Message-ID: <b1b683e7-e191-4487-b549-79a57986c670@suse.cz>
Date: Wed, 3 Sep 2025 18:10:10 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Yueyang Pan <pyyjason@...il.com>, Suren Baghdasaryan <surenb@...gle.com>,
 Andrew Morton <akpm@...ux-foundation.org>, Michal Hocko <mhocko@...e.com>,
 Brendan Jackman <jackmanb@...gle.com>, Johannes Weiner <hannes@...xchg.org>,
 Zi Yan <ziy@...dia.com>, Vishal Moola <vishal.moola@...il.com>,
 Shakeel Butt <shakeel.butt@...ux.dev>, Usama Arif <usamaarif642@...il.com>
Cc: linux-mm@...ck.org, kernel-team@...a.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] mm/show_mem: Dump the status of the mem alloc
 profiling before printing

On 9/3/25 13:16, Yueyang Pan wrote:
> This patch prints the status of the memory allocation profiling
> before __show_mem actually prints the detailed allocation info.
> This way will let us know the `0B` we saw in allocation info is
> because the profiling is disabled or the allocation is actually
> 0B.
> 
> Signed-off-by: Yueyang Pan <pyyjason@...il.com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>

> ---
>  mm/show_mem.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/mm/show_mem.c b/mm/show_mem.c
> index ecf20a93ea54..fd85a028a926 100644
> --- a/mm/show_mem.c
> +++ b/mm/show_mem.c
> @@ -427,7 +427,8 @@ void __show_mem(unsigned int filter, nodemask_t *nodemask, int max_zone_idx)
>  
>  		nr = alloc_tag_top_users(tags, ARRAY_SIZE(tags), false);
>  		if (nr) {
> -			pr_notice("Memory allocations:\n");
> +			pr_notice("Memory allocations (profiling is currently turned %s):\n",
> +				mem_alloc_profiling_enabled() ? "on" : "off");
>  			for (i = 0; i < nr; i++) {
>  				struct codetag *ct = tags[i].ct;
>  				struct alloc_tag *tag = ct_to_alloc_tag(ct);