linux-kernel - [PATCH 8/8] memblock: print kernel internal size

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Date:   Thu, 24 Mar 2022 16:01:58 +0900
From:   Jaewon Kim <jaewon31.kim@...sung.com>
To:     rppt@...nel.org, vbabka@...e.cz, akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        ytk.lee@...sung.com, jaewon31.kim@...il.com,
        Jaewon Kim <jaewon31.kim@...sung.com>
Subject: [PATCH 8/8] memblock: print kernel internal size

Kernel internal size information is also useful to compare with other
binary. This patch print kernel text, rwdata, rodata, bss, and others.

Here's an example.

Reserved    :  746924 KB
 .kernel    :  137027 KB
  .text     :   28158 KB
  .rwdata   :    3238 KB
  .rodata   :   13468 KB
  .bss      :   12570 KB
  .etc      :   79593 KB
 .unusable  :  609897 KB
System      : 3447380 KB
 .common    : 3152468 KB
 .reusable  :  294912 KB
Total       : 4194304 KB (  4096.00 MB )

Signed-off-by: Jaewon Kim <jaewon31.kim@...sung.com>
---
 include/linux/mm.h |  3 +++
 mm/memblock.c      | 17 +++++++++++++++++
 mm/page_alloc.c    |  6 +++---
 3 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 7a3dd7e617e4..6b874c602b3b 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3387,4 +3387,7 @@ madvise_set_anon_name(struct mm_struct *mm, unsigned long start,
 }
 #endif
 
+extern unsigned long physpages, codesize, datasize, rosize, bss_size;
+extern unsigned long init_code_size, init_data_size;
+
 #endif /* _LINUX_MM_H */
diff --git a/mm/memblock.c b/mm/memblock.c
index ef8cec6242d2..083d19b1d061 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -2494,6 +2494,13 @@ static int memblock_memsize_show(struct seq_file *m, void *private)
 	struct memsize_rgn_struct *rgn;
 	unsigned long reserved = 0, reusable = 0, total;
 	unsigned long system = totalram_pages() << PAGE_SHIFT;
+	unsigned long text, rw, ro, bss, etc;
+
+	text = codesize;
+	rw = datasize;
+	ro = rosize;
+	bss = bss_size;
+	etc = kernel_init_size - text - rw - ro - bss;
 
 	sort(memsize_rgn, memsize_rgn_count,
 	     sizeof(memsize_rgn[0]), memsize_rgn_cmp, NULL);
@@ -2526,6 +2533,16 @@ static int memblock_memsize_show(struct seq_file *m, void *private)
 		   DIV_ROUND_UP(kernel_init_size + reserved, SZ_1K));
 	seq_printf(m, " .kernel    : %7lu KB\n",
 		   DIV_ROUND_UP(kernel_init_size, SZ_1K));
+	seq_printf(m, "  .text     : %7lu KB\n"
+		      "  .rwdata   : %7lu KB\n"
+		      "  .rodata   : %7lu KB\n"
+		      "  .bss      : %7lu KB\n"
+		      "  .etc      : %7lu KB\n",
+			DIV_ROUND_UP(text, SZ_1K),
+			DIV_ROUND_UP(rw, SZ_1K),
+			DIV_ROUND_UP(ro, SZ_1K),
+			DIV_ROUND_UP(bss, SZ_1K),
+			DIV_ROUND_UP(etc, SZ_1K));
 	seq_printf(m, " .unusable  : %7lu KB\n",
 		   DIV_ROUND_UP(reserved, SZ_1K));
 	seq_printf(m, "System      : %7lu KB\n",
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index bbbe314850b0..2bf75ba3c66d 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -8243,11 +8243,11 @@ unsigned long free_reserved_area(void *start, void *end, int poison, const char
 	return pages;
 }
 
+unsigned long physpages, codesize, datasize, rosize, bss_size;
+unsigned long init_code_size, init_data_size;
+
 void __init mem_init_print_info(void)
 {
-	unsigned long physpages, codesize, datasize, rosize, bss_size;
-	unsigned long init_code_size, init_data_size;
-
 	physpages = get_num_physpages();
 	codesize = _etext - _stext;
 	datasize = _edata - _sdata;
-- 
2.17.1