linux-kernel - Re: [PATCH v4 3/3] vsprintf: dump full information of page flags in pGp

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Date:   Tue, 9 Feb 2021 13:00:50 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Yafang Shao <laoar.shao@...il.com>, willy@...radead.org,
        andriy.shevchenko@...ux.intel.com, david@...hat.com,
        linmiaohe@...wei.com, cl@...ux.com, penberg@...nel.org,
        rientjes@...gle.com, iamjoonsoo.kim@....com,
        akpm@...ux-foundation.org, pmladek@...e.com, rostedt@...dmis.org,
        sergey.senozhatsky@...il.com, joe@...ches.com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/3] vsprintf: dump full information of page flags in
 pGp

On 2/9/21 11:56 AM, Yafang Shao wrote:
> Currently the pGp only shows the names of page flags, rather than
> the full information including section, node, zone, last cpupid and
> kasan tag. While it is not easy to parse these information manually
> because there're so many flavors. Let's interpret them in pGp as well.
> 
> To be compitable with the existed format of pGp, the new introduced ones
> also use '|' as the separator, then the user tools parsing pGp won't
> need to make change, suggested by Matthew. The new information is
> tracked onto the end of the existed one.
> 
> On example of the output in mm/slub.c as follows,
> - Before the patch,
> [ 6343.396602] Slab 0x000000004382e02b objects=33 used=3 fp=0x000000009ae06ffc flags=0x17ffffc0010200(slab|head)
> 
> - After the patch,
> [ 8838.835456] Slab 0x000000002828b78a objects=33 used=3 fp=0x00000000d04efc88 flags=0x17ffffc0010200(slab|head|node=0|zone=2|lastcpupid=0x1fffff)
> 
> The documentation and test cases are also updated. The output of the
> test cases as follows,
> [  501.485081] test_printf: loaded.
> [  501.485768] test_printf: all 388 tests passed
> [  501.488762] test_printf: unloaded.
> 
> Signed-off-by: Yafang Shao <laoar.shao@...il.com>
> Cc: David Hildenbrand <david@...hat.com>
> Cc: Joe Perches <joe@...ches.com>
> Cc: Miaohe Lin <linmiaohe@...wei.com>
> Cc: Vlastimil Babka <vbabka@...e.cz>
> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Cc: Matthew Wilcox <willy@...radead.org>

Acked-by: Vlastimil Babka <vbabka@...e.cz>

The 'pfl' array should be even useful in kernel crash dump tools!