linux-kernel - Re: [PATCH v2 27/28] tools/cgroup: make slabinfo.py compatible with new slab controller

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Date:   Thu, 30 Jan 2020 07:47:29 +0530
From:   Bharata B Rao <bharata@...ux.ibm.com>
To:     Roman Gushchin <guro@...com>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        linux-kernel@...r.kernel.org, kernel-team@...com,
        Yafang Shao <laoar.shao@...il.com>
Subject: Re: [PATCH v2 27/28] tools/cgroup: make slabinfo.py compatible with
 new slab controller

On Mon, Jan 27, 2020 at 09:34:52AM -0800, Roman Gushchin wrote:
> Make slabinfo.py compatible with the new slab controller.
 
Tried using slabinfo.py, but run into some errors. (I am using your
new_slab.2 branch)

 ./tools/cgroup/slabinfo.py /sys/fs/cgroup/memory/1
Traceback (most recent call last):
  File "/usr/local/bin/drgn", line 11, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.6/dist-packages/drgn/internal/cli.py", line 127, in main
    runpy.run_path(args.script[0], init_globals=init_globals, run_name="__main__")
  File "/usr/lib/python3.6/runpy.py", line 263, in run_path
    pkg_name=pkg_name, script_name=fname)
  File "/usr/lib/python3.6/runpy.py", line 96, in _run_module_code
    mod_name, mod_spec, pkg_name, script_name)
  File "/usr/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "./tools/cgroup/slabinfo.py", line 220, in <module>
    main()
  File "./tools/cgroup/slabinfo.py", line 165, in main
    find_memcg_ids()
  File "./tools/cgroup/slabinfo.py", line 43, in find_memcg_ids
    MEMCGS[css.cgroup.kn.id.ino.value_()] = memcg
AttributeError: '_drgn.Object' object has no attribute 'ino'

I did make this change...

# git diff
diff --git a/tools/cgroup/slabinfo.py b/tools/cgroup/slabinfo.py
index b779a4863beb..571fd95224d6 100755
--- a/tools/cgroup/slabinfo.py
+++ b/tools/cgroup/slabinfo.py
@@ -40,7 +40,7 @@ def find_memcg_ids(css=prog['root_mem_cgroup'].css, prefix=''):
                                        'sibling'):
             name = prefix + '/' + css.cgroup.kn.name.string_().decode('utf-8')
             memcg = container_of(css, 'struct mem_cgroup', 'css')
-            MEMCGS[css.cgroup.kn.id.ino.value_()] = memcg
+            MEMCGS[css.cgroup.kn.id.value_()] = memcg
             find_memcg_ids(css, name)


but now get empty output.

# ./tools/cgroup/slabinfo.py /sys/fs/cgroup/memory/1
# name            <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab> : tunables <limit> <batchcount> <sharedfactor> : slabdata <active_slabs> <num_slabs> <sharedavail>

Guess this script is not yet ready for the upstream kernel?

Regards,
Bharata.