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Date:   Tue, 24 Oct 2023 06:46:32 -0700
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Subject: [PATCH v2 35/39] lib: add memory allocations report in show_mem()
From:   Suren Baghdasaryan <surenb@google.com>
To:     akpm@linux-foundation.org
Cc:     kent.overstreet@linux.dev, mhocko@suse.com, vbabka@suse.cz,
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Precedence: bulk

Include allocations in show_mem reports.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
---
 include/linux/alloc_tag.h |  2 ++
 lib/alloc_tag.c           | 37 +++++++++++++++++++++++++++++++++++++
 mm/show_mem.c             | 15 +++++++++++++++
 3 files changed, 54 insertions(+)

diff --git a/include/linux/alloc_tag.h b/include/linux/alloc_tag.h
index 3fe51e67e231..0a5973c4ad77 100644
--- a/include/linux/alloc_tag.h
+++ b/include/linux/alloc_tag.h
@@ -30,6 +30,8 @@ struct alloc_tag {
 
 #ifdef CONFIG_MEM_ALLOC_PROFILING
 
+void alloc_tags_show_mem_report(struct seq_buf *s);
+
 static inline struct alloc_tag *ct_to_alloc_tag(struct codetag *ct)
 {
 	return container_of(ct, struct alloc_tag, ct);
diff --git a/lib/alloc_tag.c b/lib/alloc_tag.c
index 2d5226d9262d..2f7a2e3ddf55 100644
--- a/lib/alloc_tag.c
+++ b/lib/alloc_tag.c
@@ -96,6 +96,43 @@ static const struct seq_operations allocinfo_seq_op = {
 	.show	= allocinfo_show,
 };
 
+void alloc_tags_show_mem_report(struct seq_buf *s)
+{
+	struct codetag_iterator iter;
+	struct codetag *ct;
+	struct {
+		struct codetag		*tag;
+		size_t			bytes;
+	} tags[10], n;
+	unsigned int i, nr = 0;
+
+	codetag_lock_module_list(alloc_tag_cttype, true);
+	iter = codetag_get_ct_iter(alloc_tag_cttype);
+	while ((ct = codetag_next_ct(&iter))) {
+		struct alloc_tag_counters counter = alloc_tag_read(ct_to_alloc_tag(ct));
+		n.tag	= ct;
+		n.bytes = counter.bytes;
+
+		for (i = 0; i < nr; i++)
+			if (n.bytes > tags[i].bytes)
+				break;
+
+		if (i < ARRAY_SIZE(tags)) {
+			nr -= nr == ARRAY_SIZE(tags);
+			memmove(&tags[i + 1],
+				&tags[i],
+				sizeof(tags[0]) * (nr - i));
+			nr++;
+			tags[i] = n;
+		}
+	}
+
+	for (i = 0; i < nr; i++)
+		alloc_tag_to_text(s, tags[i].tag);
+
+	codetag_lock_module_list(alloc_tag_cttype, false);
+}
+
 static void __init procfs_init(void)
 {
 	proc_create_seq("allocinfo", 0444, NULL, &allocinfo_seq_op);
diff --git a/mm/show_mem.c b/mm/show_mem.c
index 4b888b18bdde..660e9a78a34d 100644
--- a/mm/show_mem.c
+++ b/mm/show_mem.c
@@ -12,6 +12,7 @@
 #include <linux/hugetlb.h>
 #include <linux/mm.h>
 #include <linux/mmzone.h>
+#include <linux/seq_buf.h>
 #include <linux/swap.h>
 #include <linux/vmstat.h>
 
@@ -426,4 +427,18 @@ void __show_mem(unsigned int filter, nodemask_t *nodemask, int max_zone_idx)
 #ifdef CONFIG_MEMORY_FAILURE
 	printk("%lu pages hwpoisoned\n", atomic_long_read(&num_poisoned_pages));
 #endif
+#ifdef CONFIG_MEM_ALLOC_PROFILING
+	{
+		struct seq_buf s;
+		char *buf = kmalloc(4096, GFP_ATOMIC);
+
+		if (buf) {
+			printk("Memory allocations:\n");
+			seq_buf_init(&s, buf, 4096);
+			alloc_tags_show_mem_report(&s);
+			printk("%s", buf);
+			kfree(buf);
+		}
+	}
+#endif
 }
-- 
2.42.0.758.gaed0368e0e-goog