linux-kernel - Re: [PATCH v4 0/3] mm, vsprintf: dump full information of page flags in pGp

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Date:   Tue, 9 Feb 2021 14:41:01 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Yafang Shao <laoar.shao@...il.com>
Cc:     willy@...radead.org, david@...hat.com, linmiaohe@...wei.com,
        vbabka@...e.cz, 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, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 0/3] mm, vsprintf: dump full information of page flags
 in pGp

On Tue, Feb 09, 2021 at 06:56:10PM +0800, Yafang Shao wrote:
> The existed pGp shows the names of page flags only, rather than the full
> information including section, node, zone, last cpuipid and kasan tag.
> While it is not easy to parse these information manually because there
> are so many flavors. We'd better interpret them in printf.
> 
> 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 added information is
> tracked onto the end of the existed one, e.g.
> [ 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 result of the
> test cases as follows,
> [  501.485081] test_printf: loaded.
> [  501.485768] test_printf: all 388 tests passed
> [  501.488762] test_printf: unloaded.
> 
> This patchset also includes some code cleanup in mm/slub.c.

FWIW,
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

> v4:
> - extend %pGp instead of introducing new format, per Matthew
> 
> v3:
> - coding improvement, per Joe and Andy
> - the possible impact on debugfs and the fix of it, per Joe and Matthew
> - introduce new format instead of changing pGp, per Andy
> 
> v2:
> - various coding improvement, per Joe, Miaohe, Vlastimil and Andy
> - remove the prefix completely in patch #2, per Vlastimil
> - Update the test cases, per Andy
> 
> Yafang Shao (3):
>   mm, slub: use pGp to print page flags
>   mm, slub: don't combine pr_err with INFO
>   vsprintf: dump full information of page flags in pGp
> 
>  Documentation/core-api/printk-formats.rst |  2 +-
>  lib/test_printf.c                         | 60 +++++++++++++++++----
>  lib/vsprintf.c                            | 66 +++++++++++++++++++++--
>  mm/slub.c                                 | 13 ++---
>  4 files changed, 121 insertions(+), 20 deletions(-)
> 
> -- 
> 2.17.1
> 

-- 
With Best Regards,
Andy Shevchenko