Re: [PATCH] memcg: Add kmem.slabinfo to v2 for debugging purpose

[Tejun Heo]

Hello, Waiman.

On Wed, Jun 26, 2019 at 12:56:14PM -0400, Waiman Long wrote:
> With memory cgroup v1, there is a kmem.slabinfo file that can be
> used to view what slabs are allocated to the memory cgroup. There
> is currently no such equivalent in memory cgroup v2. This file can
> be useful for debugging purpose.
> 
> This patch adds an equivalent kmem.slabinfo to v2 with the caveat that
> this file will only show up as ".__DEBUG__.memory.kmem.slabinfo" when the
> "cgroup_debug" parameter is specified in the kernel boot command line.
> This is to avoid cluttering the cgroup v2 interface with files that
> are seldom used by end users.

Can you please take a look at drgn?

  https://github.com/osandov/drgn

Baking in debug interface files always is limited and nasty and drgn
can get you way more flexible debugging / monitoring tool w/o having
to bake in anything into the kernel.  For an example, please take a
look at

  https://lore.kernel.org/bpf/20190614015620.1587672-10-tj@xxxxxxxxxx/

Thanks.

-- 
tejun