tools/cgroup/memcg_slabinfo.py is broken

[Vasily Averin <vvs@virtuozzo.com>]

Dear all,

commit 07f910f9b729 ("mm: Remove slab from struct page")
broke tools/cgroup/memcg_slabinfo.py script.
It was used as replacement of /psys/fs/cgroup/memory/memory.kmem.slabinfo
and was used to monitor slab objects related to specified cgroup

# ./memcg_slabinfo.py /sys/fs/cgroup/memory/lxc.payload.c9s/
# name            <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab> : tunables <limit> <batchcount> <sharedfactor> : slabdata <active_slabs> <num_slabs> <sharedavail>
Traceback (most recent call last):
   File "/usr/bin/drgn", line 33, in <module>
     sys.exit(load_entry_point('drgn==0.0.16', 'console_scripts', 'drgn')())
   File "/usr/lib64/python3.10/site-packages/drgn/internal/cli.py", line 133, in main
     runpy.run_path(args.script[0], init_globals=init_globals, run_name="__main__")
   File "/usr/lib64/python3.10/runpy.py", line 269, in run_path
     return _run_module_code(code, init_globals, run_name,
   File "/usr/lib64/python3.10/runpy.py", line 96, in _run_module_code
     _run_code(code, mod_globals, init_globals,
   File "/usr/lib64/python3.10/runpy.py", line 86, in _run_code
     exec(code, run_globals)
   File "./memcg_slabinfo.py", line 226, in <module>
     main()
   File "./memcg_slabinfo.py", line 199, in main
     cache = page.slab_cache
AttributeError: 'struct page' has no member 'slab_cache'

Any ideas how to repair it ?

Thank you,
	Vasily Averin