[PATCH v1] mm: page_alloc: Add debug log in free_reserved_area for static memory

Faiyaz Mohammed
2021-09-28T09:04:23Z

For INITRD and initmem memory is reserved through "memblock_reserve"
during boot up but it is free via "free_reserved_area" instead
of "memblock_free".
For example:
[ 0.294848] Freeing initrd memory: 12K.
[ 0.696688] Freeing unused kernel memory: 4096K.

To get the start and end address of the above freed memory and to account
proper memblock added memblock_dbg log in "free_reserved_area".
After adding log:
[ 0.294837] memblock_free: [0x00000083600000-0x00000083603000] free_initrd_mem+0x20/0x28
[ 0.294848] Freeing initrd memory: 12K.
[ 0.695246] memblock_free: [0x00000081600000-0x00000081a00000] free_initmem+0x70/0xc8
[ 0.696688] Freeing unused kernel memory: 4096K.

Signed-off-by: Faiyaz Mohammed <faiyazm@codeaurora.org>
---
mm/page_alloc.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index b37435c..f85c3b2 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -8129,6 +8129,11 @@ unsigned long free_reserved_area(void *start, void *end, int poison, const char
pr_info("Freeing %s memory: %ldK\n",
s, pages << (PAGE_SHIFT - 10));

+#ifdef CONFIG_HAVE_MEMBLOCK
+ memblock_dbg("memblock_free: [%#016llx-%#016llx] %pS\n",
+ __pa(start), __pa(end), (void *)_RET_IP_);
+#endif
+
return pages;
}

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