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

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Message-ID: <d7998ea0ddc2ea1a78bb6e89adf530526f76679a.1756897825.git.pyyjason@gmail.com>
Date: Wed,  3 Sep 2025 04:16:13 -0700
From: Yueyang Pan <pyyjason@...il.com>
To: Suren Baghdasaryan <surenb@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vlastimil Babka <vbabka@...e.cz>,
	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: [PATCH v3 1/2] mm/show_mem: Dump the status of the mem alloc profiling  before printing

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>
---
 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);
-- 
2.47.3