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

Jaewon Kim
2022-03-24T07:00:09Z

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@samsung.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