[Crash-utility] [PATCH v2 0/6] Add maple tree vma iteration support for crash
lijiang
lijiang at redhat.com
Thu Oct 27 03:48:03 UTC 2022
On Tue, Oct 25, 2022 at 8:39 PM <crash-utility-request at redhat.com> wrote:
> Date: Tue, 25 Oct 2022 20:38:19 +0800
> From: Tao Liu <ltao at redhat.com>
> To: crash-utility at redhat.com
> Subject: [Crash-utility] [PATCH v2 0/6] Add maple tree vma iteration
> support for crash
> Message-ID: <20221025123825.36421-1-ltao at redhat.com>
> Content-Type: text/plain; charset="US-ASCII"; x-default=true
>
> Patchset [1] introduces maple tree data structure for linux, and the
> modification on mm subsystem.
>
> The main impact on crash utility, is the modification on vm_area_struct.
> Patch [2][3] removed the rbtree and linked list iteration of
> vm_area_struct, making it impossible for crash to iterate vma
> in the traditional way. For example, we can observe the failing
> of crash cmd vm/fuser on kernel which has integrated with patchset [1].
>
> This patchset deals with the issue by porting and adapting
> kernel's maple tree vma iteration code to crash utility. It has been
> tested on linux-next-next-20220914 [4].
>
> [1]: https://lore.kernel.org/all/20220906194824.2110408-1-Liam.Howlett@oracle.com/
> [2]: https://github.com/oracle/linux-uek/commit/d19703645b80abe35dff1a88449d074b0b5b1bb1
> [3]: https://github.com/oracle/linux-uek/commit/91dee01f1ebb6b6587463b6ee6f7bbc4965f91d5
> [4]: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/snapshot/linux-next-next-20220914.tar.gz
>
> v1 -> v2:
>
> 1) Move xarray.h and maple_tree_vma.h into maple.h.
> 2) Remove variable-length array for maple_tree.c.
> 3) Add tree cmd and do_maple_tree() support for maple tree.
Thank you for the update, Tao. We are getting back on the right path.
Lianbo
> 4) Other small modifications.
>
> Tao Liu (6):
> Port the maple tree data structures and main functions
> Introduce maple tree vma iteration to memory.c
> Add tree cmd support for maple tree
> Update the maple tree help info for tree cmd
> Add do_maple_tree support for maple tree
> Dump maple tree offset variables by help -o
>
> Makefile | 12 +-
> defs.h | 30 ++
> help.c | 45 +-
> maple_tree.c | 1367 ++++++++++++++++++++++++++++++++++++++++++++++++++
> maple_tree.h | 214 ++++++++
> memory.c | 319 +++++++-----
> symbols.c | 40 ++
> tools.c | 20 +-
> 8 files changed, 1885 insertions(+), 162 deletions(-)
> create mode 100644 maple_tree.c
> create mode 100644 maple_tree.h
>
> --
> 2.33.1
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