Re: [PATCH v6 resend 0/3] mm, vsprintf: dump full information of page flags in pGp

[Yafang Shao <laoar.shao@gmail.com>]

On Fri, Mar 19, 2021 at 6:13 PM Yafang Shao <laoar.shao@gmail.com> 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,
> [68599.816764] test_printf: loaded.
> [68599.819068] test_printf: all 388 tests passed
> [68599.830367] test_printf: unloaded.
>
> This patchset also includes some code cleanup in mm/slub.c.
>
> v6:
> - fixes the build failure and test failure reported by kernel test robot
>
> v5:
> - remove the bitmap and better name the struct, per Petr
>
> 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                         | 90 ++++++++++++++++++++---
>  lib/vsprintf.c                            | 66 +++++++++++++++--
>  mm/slub.c                                 | 13 ++--
>  4 files changed, 149 insertions(+), 22 deletions(-)
>
> --
> 2.18.2
>

Hi Petr,

Any comments on this version ?

Thanks
Yafang