[PATCH v3] mm: page_alloc: Add debug log in free_reserved_area for static memory

[PATCH v3] mm: page_alloc: Add debug log in free_reserved_area for static memory

[Faiyaz Mohammed]

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 pr_debug log in "free_reserved_area".
After adding log:
[    0.294837] 0x00000083600000-0x00000083603000 free_initrd_mem+0x20/0x28
[    0.294848] Freeing initrd memory: 12K.
[    0.695246] 0x00000081600000-0x00000081a00000 free_initmem+0x70/0xc8
[    0.696688] Freeing unused kernel memory: 4096K.

Signed-off-by: Faiyaz Mohammed <faiyazm@codeaurora.org>
---
changes in v3:
	- Update the format specifier.
changes in v2:
	- To avoid confusion, remove the memblock_dbg print and drop the
	memblock_free string, now using pr_debug to print the address ranges.

 mm/page_alloc.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index b37435c..13adda5 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -8097,6 +8097,8 @@ EXPORT_SYMBOL(adjust_managed_page_count);
 
 unsigned long free_reserved_area(void *start, void *end, int poison, const char *s)
 {
+	const phys_addr_t pstart = __pa(start);
+	const phys_addr_t pend = __pa(end);
 	void *pos;
 	unsigned long pages = 0;
 
@@ -8125,9 +8127,12 @@ unsigned long free_reserved_area(void *start, void *end, int poison, const char
 		free_reserved_page(page);
 	}
 
-	if (pages && s)
+	if (pages && s) {
 		pr_info("Freeing %s memory: %ldK\n",
 			s, pages << (PAGE_SHIFT - 10));
+		pr_debug("[%pa-%pa] %pS\n", &pstart, &pend,
+			(void *)__RET_IP_);
+	}
 
 	return pages;
 }
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a
member of the Code Aurora Forum, hosted by The Linux Foundation

Re: [PATCH v3] mm: page_alloc: Add debug log in free_reserved_area for static memory

[David Hildenbrand]

On 14.10.21 09:12, Faiyaz Mohammed wrote:
> 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 pr_debug log in "free_reserved_area".
> After adding log:
> [    0.294837] 0x00000083600000-0x00000083603000 free_initrd_mem+0x20/0x28
> [    0.294848] Freeing initrd memory: 12K.
> [    0.695246] 0x00000081600000-0x00000081a00000 free_initmem+0x70/0xc8
> [    0.696688] Freeing unused kernel memory: 4096K.
> 
> Signed-off-by: Faiyaz Mohammed <faiyazm@codeaurora.org>
> ---
> changes in v3:
> 	- Update the format specifier.
> changes in v2:
> 	- To avoid confusion, remove the memblock_dbg print and drop the
> 	memblock_free string, now using pr_debug to print the address ranges.
> 
>  mm/page_alloc.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index b37435c..13adda5 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -8097,6 +8097,8 @@ EXPORT_SYMBOL(adjust_managed_page_count);
>  
>  unsigned long free_reserved_area(void *start, void *end, int poison, const char *s)
>  {
> +	const phys_addr_t pstart = __pa(start);
> +	const phys_addr_t pend = __pa(end);
>  	void *pos;
>  	unsigned long pages = 0;
>  
> @@ -8125,9 +8127,12 @@ unsigned long free_reserved_area(void *start, void *end, int poison, const char
>  		free_reserved_page(page);
>  	}
>  
> -	if (pages && s)
> +	if (pages && s) {
>  		pr_info("Freeing %s memory: %ldK\n",
>  			s, pages << (PAGE_SHIFT - 10));
> +		pr_debug("[%pa-%pa] %pS\n", &pstart, &pend,
> +			(void *)__RET_IP_);
> +	}
>  
>  	return pages;
>  }
> 

Acked-by: David Hildenbrand <david@redhat.com>

Thanks!

-- 
Thanks,

David / dhildenb

Re: [PATCH v3] mm: page_alloc: Add debug log in free_reserved_area for static memory

[kernel test robot]

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Hi Faiyaz,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on v5.15-rc5]
[cannot apply to hnaz-mm/master next-20211013]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Faiyaz-Mohammed/mm-page_alloc-Add-debug-log-in-free_reserved_area-for-static-memory/20211014-151427
base:    64570fbc14f8d7cb3fe3995f20e26bc25ce4b2cc
config: nios2-defconfig (attached as .config)
compiler: nios2-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/009729e4f858e64537a4a144369b155f8d69d62f
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Faiyaz-Mohammed/mm-page_alloc-Add-debug-log-in-free_reserved_area-for-static-memory/20211014-151427
        git checkout 009729e4f858e64537a4a144369b155f8d69d62f
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=nios2 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   mm/page_alloc.c:3810:15: warning: no previous prototype for 'should_fail_alloc_page' [-Wmissing-prototypes]
    3810 | noinline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
         |               ^~~~~~~~~~~~~~~~~~~~~~
   In file included from include/asm-generic/bug.h:22,
                    from ./arch/nios2/include/generated/asm/bug.h:1,
                    from include/linux/bug.h:5,
                    from include/linux/mmdebug.h:5,
                    from include/linux/mm.h:9,
                    from mm/page_alloc.c:19:
   mm/page_alloc.c: In function 'free_reserved_area':
>> mm/page_alloc.c:8134:33: error: '__RET_IP_' undeclared (first use in this function)
    8134 |                         (void *)__RET_IP_);
         |                                 ^~~~~~~~~
   include/linux/printk.h:418:33: note: in definition of macro 'printk_index_wrap'
     418 |                 _p_func(_fmt, ##__VA_ARGS__);                           \
         |                                 ^~~~~~~~~~~
   include/linux/printk.h:132:17: note: in expansion of macro 'printk'
     132 |                 printk(fmt, ##__VA_ARGS__);             \
         |                 ^~~~~~
   include/linux/printk.h:576:9: note: in expansion of macro 'no_printk'
     576 |         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
         |         ^~~~~~~~~
   mm/page_alloc.c:8133:17: note: in expansion of macro 'pr_debug'
    8133 |                 pr_debug("[%pa-%pa] %pS\n", &pstart, &pend,
         |                 ^~~~~~~~
   mm/page_alloc.c:8134:33: note: each undeclared identifier is reported only once for each function it appears in
    8134 |                         (void *)__RET_IP_);
         |                                 ^~~~~~~~~
   include/linux/printk.h:418:33: note: in definition of macro 'printk_index_wrap'
     418 |                 _p_func(_fmt, ##__VA_ARGS__);                           \
         |                                 ^~~~~~~~~~~
   include/linux/printk.h:132:17: note: in expansion of macro 'printk'
     132 |                 printk(fmt, ##__VA_ARGS__);             \
         |                 ^~~~~~
   include/linux/printk.h:576:9: note: in expansion of macro 'no_printk'
     576 |         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
         |         ^~~~~~~~~
   mm/page_alloc.c:8133:17: note: in expansion of macro 'pr_debug'
    8133 |                 pr_debug("[%pa-%pa] %pS\n", &pstart, &pend,
         |                 ^~~~~~~~


vim +/__RET_IP_ +8134 mm/page_alloc.c

  8097	
  8098	unsigned long free_reserved_area(void *start, void *end, int poison, const char *s)
  8099	{
  8100		const phys_addr_t pstart = __pa(start);
  8101		const phys_addr_t pend = __pa(end);
  8102		void *pos;
  8103		unsigned long pages = 0;
  8104	
  8105		start = (void *)PAGE_ALIGN((unsigned long)start);
  8106		end = (void *)((unsigned long)end & PAGE_MASK);
  8107		for (pos = start; pos < end; pos += PAGE_SIZE, pages++) {
  8108			struct page *page = virt_to_page(pos);
  8109			void *direct_map_addr;
  8110	
  8111			/*
  8112			 * 'direct_map_addr' might be different from 'pos'
  8113			 * because some architectures' virt_to_page()
  8114			 * work with aliases.  Getting the direct map
  8115			 * address ensures that we get a _writeable_
  8116			 * alias for the memset().
  8117			 */
  8118			direct_map_addr = page_address(page);
  8119			/*
  8120			 * Perform a kasan-unchecked memset() since this memory
  8121			 * has not been initialized.
  8122			 */
  8123			direct_map_addr = kasan_reset_tag(direct_map_addr);
  8124			if ((unsigned int)poison <= 0xFF)
  8125				memset(direct_map_addr, poison, PAGE_SIZE);
  8126	
  8127			free_reserved_page(page);
  8128		}
  8129	
  8130		if (pages && s) {
  8131			pr_info("Freeing %s memory: %ldK\n",
  8132				s, pages << (PAGE_SHIFT - 10));
  8133			pr_debug("[%pa-%pa] %pS\n", &pstart, &pend,
> 8134				(void *)__RET_IP_);
  8135		}
  8136	
  8137		return pages;
  8138	}
  8139	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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Re: [PATCH v3] mm: page_alloc: Add debug log in free_reserved_area for static memory

[kernel test robot]

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Hi Faiyaz,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on v5.15-rc5]
[cannot apply to hnaz-mm/master next-20211013]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Faiyaz-Mohammed/mm-page_alloc-Add-debug-log-in-free_reserved_area-for-static-memory/20211014-151427
base:    64570fbc14f8d7cb3fe3995f20e26bc25ce4b2cc
config: hexagon-randconfig-r004-20211014 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 6c76d0101193aa4eb891a6954ff047eda2f9cf71)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/009729e4f858e64537a4a144369b155f8d69d62f
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Faiyaz-Mohammed/mm-page_alloc-Add-debug-log-in-free_reserved_area-for-static-memory/20211014-151427
        git checkout 009729e4f858e64537a4a144369b155f8d69d62f
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   mm/page_alloc.c:3810:15: warning: no previous prototype for function 'should_fail_alloc_page' [-Wmissing-prototypes]
   noinline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
                 ^
   mm/page_alloc.c:3810:10: note: declare 'static' if the function is not intended to be used outside of this translation unit
   noinline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
            ^
            static 
>> mm/page_alloc.c:8134:12: error: use of undeclared identifier '__RET_IP_'
                           (void *)__RET_IP_);
                                   ^
   1 warning and 1 error generated.


vim +/__RET_IP_ +8134 mm/page_alloc.c

  8097	
  8098	unsigned long free_reserved_area(void *start, void *end, int poison, const char *s)
  8099	{
  8100		const phys_addr_t pstart = __pa(start);
  8101		const phys_addr_t pend = __pa(end);
  8102		void *pos;
  8103		unsigned long pages = 0;
  8104	
  8105		start = (void *)PAGE_ALIGN((unsigned long)start);
  8106		end = (void *)((unsigned long)end & PAGE_MASK);
  8107		for (pos = start; pos < end; pos += PAGE_SIZE, pages++) {
  8108			struct page *page = virt_to_page(pos);
  8109			void *direct_map_addr;
  8110	
  8111			/*
  8112			 * 'direct_map_addr' might be different from 'pos'
  8113			 * because some architectures' virt_to_page()
  8114			 * work with aliases.  Getting the direct map
  8115			 * address ensures that we get a _writeable_
  8116			 * alias for the memset().
  8117			 */
  8118			direct_map_addr = page_address(page);
  8119			/*
  8120			 * Perform a kasan-unchecked memset() since this memory
  8121			 * has not been initialized.
  8122			 */
  8123			direct_map_addr = kasan_reset_tag(direct_map_addr);
  8124			if ((unsigned int)poison <= 0xFF)
  8125				memset(direct_map_addr, poison, PAGE_SIZE);
  8126	
  8127			free_reserved_page(page);
  8128		}
  8129	
  8130		if (pages && s) {
  8131			pr_info("Freeing %s memory: %ldK\n",
  8132				s, pages << (PAGE_SHIFT - 10));
  8133			pr_debug("[%pa-%pa] %pS\n", &pstart, &pend,
> 8134				(void *)__RET_IP_);
  8135		}
  8136	
  8137		return pages;
  8138	}
  8139	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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