+ alloc_tag-introduce-shutdown_mem_profiling-helper-function.patch added to mm-unstable branch

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The patch titled
     Subject: alloc_tag: introduce shutdown_mem_profiling helper function
has been added to the -mm mm-unstable branch.  Its filename is
     alloc_tag-introduce-shutdown_mem_profiling-helper-function.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/alloc_tag-introduce-shutdown_mem_profiling-helper-function.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Subject: alloc_tag: introduce shutdown_mem_profiling helper function
Date: Wed, 23 Oct 2024 10:07:55 -0700

Implement a helper function to disable memory allocation profiling and use
it when creation of /proc/allocinfo fails.  Ensure /proc/allocinfo does
not get created when memory allocation profiling is disabled.

Link: https://lkml.kernel.org/r/20241023170759.999909-3-surenb@xxxxxxxxxx
Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Reviewed-by: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Daniel Gomez <da.gomez@xxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Dennis Zhou <dennis@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Kalesh Singh <kaleshsingh@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Cc: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Paul E. McKenney <paulmck@xxxxxxxxxx>
Cc: Petr Pavlu <petr.pavlu@xxxxxxxx>
Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Cc: Sami Tolvanen <samitolvanen@xxxxxxxxxx>
Cc: Sourav Panda <souravpanda@xxxxxxxxxx>
Cc: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Thomas Huth <thuth@xxxxxxxxxx>
Cc: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Xiongwei Song <xiongwei.song@xxxxxxxxxxxxx>
Cc: Yu Zhao <yuzhao@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 lib/alloc_tag.c |   33 ++++++++++++++++++++++++++-------
 1 file changed, 26 insertions(+), 7 deletions(-)

--- a/lib/alloc_tag.c~alloc_tag-introduce-shutdown_mem_profiling-helper-function
+++ a/lib/alloc_tag.c
@@ -8,6 +8,14 @@
 #include <linux/seq_buf.h>
 #include <linux/seq_file.h>
 
+#define ALLOCINFO_FILE_NAME		"allocinfo"
+
+#ifdef CONFIG_MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT
+static bool mem_profiling_support __meminitdata = true;
+#else
+static bool mem_profiling_support __meminitdata;
+#endif
+
 static struct codetag_type *alloc_tag_cttype;
 
 DEFINE_PER_CPU(struct alloc_tag_counters, _shared_alloc_tag);
@@ -144,9 +152,26 @@ size_t alloc_tag_top_users(struct codeta
 	return nr;
 }
 
+static void __init shutdown_mem_profiling(void)
+{
+	if (mem_alloc_profiling_enabled())
+		static_branch_disable(&mem_alloc_profiling_key);
+
+	if (!mem_profiling_support)
+		return;
+
+	mem_profiling_support = false;
+}
+
 static void __init procfs_init(void)
 {
-	proc_create_seq("allocinfo", 0400, NULL, &allocinfo_seq_op);
+	if (!mem_profiling_support)
+		return;
+
+	if (!proc_create_seq(ALLOCINFO_FILE_NAME, 0400, NULL, &allocinfo_seq_op)) {
+		pr_err("Failed to create %s file\n", ALLOCINFO_FILE_NAME);
+		shutdown_mem_profiling();
+	}
 }
 
 static bool alloc_tag_module_unload(struct codetag_type *cttype,
@@ -174,12 +199,6 @@ static bool alloc_tag_module_unload(stru
 	return module_unused;
 }
 
-#ifdef CONFIG_MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT
-static bool mem_profiling_support __meminitdata = true;
-#else
-static bool mem_profiling_support __meminitdata;
-#endif
-
 static int __init setup_early_mem_profiling(char *str)
 {
 	bool enable;
_

Patches currently in -mm which might be from surenb@xxxxxxxxxx are

maple_tree-add-mas_for_each_rev-helper.patch
alloc_tag-introduce-shutdown_mem_profiling-helper-function.patch
alloc_tag-load-module-tags-into-separate-contiguous-memory.patch
alloc_tag-populate-memory-for-module-tags-as-needed.patch
alloc_tag-introduce-pgtag_ref_handle-to-abstract-page-tag-references.patch
alloc_tag-support-for-page-allocation-tag-compression.patch





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