linux-kernel - Re: [PATCH bpf-next v2 6/7] bpf: selftests: selftests for memcg stat kfuncs

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Message-ID: <cipotudex5346rnml5fnzdghlnuhdtsberlhmmphsjrvjyy3bh@ozwywiozr26v>
Date: Fri, 19 Dec 2025 21:23:22 -0800
From: Shakeel Butt <shakeel.butt@...ux.dev>
To: Roman Gushchin <roman.gushchin@...ux.dev>
Cc: bpf@...r.kernel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
	JP Kobryn <inwardvessel@...il.com>, Alexei Starovoitov <ast@...nel.org>, 
	Daniel Borkmann <daniel@...earbox.net>, Michal Hocko <mhocko@...nel.org>, 
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH bpf-next v2 6/7] bpf: selftests: selftests for memcg stat
 kfuncs

On Fri, Dec 19, 2025 at 08:12:49PM -0800, Roman Gushchin wrote:
> From: JP Kobryn <inwardvessel@...il.com>
> 
> Add test coverage for the kfuncs that fetch memcg stats. Using some common
> stats, test scenarios ensuring that the given stat increases by some
> arbitrary amount. The stats selected cover the three categories represented
> by the enums: node_stat_item, memcg_stat_item, vm_event_item.
> 
> Since only a subset of all stats are queried, use a static struct made up
> of fields for each stat. Write to the struct with the fetched values when
> the bpf program is invoked and read the fields in the user mode program for
> verification.
> 
> Signed-off-by: JP Kobryn <inwardvessel@...il.com>
> Signed-off-by: Roman Gushchin <roman.gushchin@...ux.dev>

Acked-by: Shakeel Butt <shakeel.butt@...ux.dev>