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From: Vlastimil Babka <vbabka@suse.cz>
To: Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Walter Wu <walter-zh.wu@mediatek.com>
Cc: Qian Cai <cai@lca.pw>, Alexander Potapenko <glider@google.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Martin Schwidefsky <schwidefsky@de.ibm.com>,
	Andrey Konovalov <andreyknvl@google.com>,
	Arnd Bergmann <arnd@arndb.de>,
	linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com,
	linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org, wsd_upstream@mediatek.com
Subject: Re: [PATCH v3] mm/kasan: dump alloc and free stack for page allocator
Date: Tue, 17 Sep 2019 10:19:15 +0200
Message-ID: <a5103bf0-245e-5894-0486-3e92fa830e41@suse.cz> (raw)
In-Reply-To: <4e76e7ce-1d61-524a-622b-663c01d19707@virtuozzo.com>

On 9/16/19 5:57 PM, Andrey Ryabinin wrote:
>> --- a/mm/page_alloc.c
>> +++ b/mm/page_alloc.c
>> @@ -710,8 +710,12 @@ static int __init early_debug_pagealloc(char *buf)
>>  	if (kstrtobool(buf, &enable))
>>  		return -EINVAL;
>>  
>> -	if (enable)
>> +	if (enable) {
>>  		static_branch_enable(&_debug_pagealloc_enabled);
>> +#ifdef CONFIG_PAGE_OWNER
>> +		page_owner_free_stack_disabled = false;
> 
> I think this won't work with CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT=y

Good point, thanks.

>> +#endif
>> +	}
>>  
>>  	return 0;
>>  }
>> diff --git a/mm/page_owner.c b/mm/page_owner.c
>> index dee931184788..b589bfbc4795 100644
>> --- a/mm/page_owner.c
>> +++ b/mm/page_owner.c
>> @@ -24,13 +24,15 @@ struct page_owner {
>>  	short last_migrate_reason;
>>  	gfp_t gfp_mask;
>>  	depot_stack_handle_t handle;
>> -#ifdef CONFIG_DEBUG_PAGEALLOC
>> +#ifdef CONFIG_PAGE_OWNER_FREE_STACK
>>  	depot_stack_handle_t free_handle;
>>  #endif
>>  };
>>  
>>  static bool page_owner_disabled = true;
>> +bool page_owner_free_stack_disabled = true;
>>  DEFINE_STATIC_KEY_FALSE(page_owner_inited);
>> +static DEFINE_STATIC_KEY_FALSE(page_owner_free_stack);
>>  
>>  static depot_stack_handle_t dummy_handle;
>>  static depot_stack_handle_t failure_handle;
>> @@ -46,6 +48,9 @@ static int __init early_page_owner_param(char *buf)
>>  	if (strcmp(buf, "on") == 0)
>>  		page_owner_disabled = false;
>>  
>> +	if (!page_owner_disabled && IS_ENABLED(CONFIG_KASAN))
> 
> I'd rather keep all logic in one place, i.e. "if (!page_owner_disabled && (IS_ENABLED(CONFIG_KASAN) || debug_pagealloc_enabled())"
> With this no changes in early_debug_pagealloc() required and CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT=y should also work correctly.

In this function it would not work if the debug_pagealloc param gets
processed later than page_owner, but should be doable in
init_page_owner(), I'll try, thanks.

> 
>> +		page_owner_free_stack_disabled = false;
>> +
>>  	return 0;
>>  }
>>  early_param("page_owner", early_page_owner_param);
>  
> 



  reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-11  8:39 Walter Wu
2019-09-11 15:19 ` Qian Cai
2019-09-12 13:53   ` Vlastimil Babka
2019-09-12 14:08     ` Andrey Ryabinin
2019-09-12 14:08     ` Walter Wu
2019-09-12 14:31       ` Vlastimil Babka
2019-09-12 15:13         ` Walter Wu
2019-09-12 17:05         ` Andrey Ryabinin
2019-09-16  9:42           ` Vlastimil Babka
2019-09-16 15:57             ` Andrey Ryabinin
2019-09-17  8:19               ` Vlastimil Babka [this message]
2019-09-23  8:20               ` [PATCH] mm, debug, kasan: save and dump freeing stack trace for kasan Vlastimil Babka
2019-09-25  9:41                 ` Andrey Ryabinin
2019-09-12 14:10     ` [PATCH v3] mm/kasan: dump alloc and free stack for page allocator Qian Cai

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