[LTP] memcg/memcontrol05: add cgroup v2 task migration charge accounting test

[linuxtestproject.agent@gmail.com]

Hi Pavithra,

On Thu, Aug 13, 2026, Pavithra wrote:
> memcg/memcontrol05: add cgroup v2 task migration charge accounting test

> 	group_a = tst_cg_group_mk(tst_cg, "group_a");
> 	group_b = tst_cg_group_mk(tst_cg, "group_b");
>
> 	SAFE_CG_SCANF(group_b, "memory.current", "%ld", &baseline_b);

Could the test disable swapping for both child cgroups before starting the
worker? Touching the pages only makes them resident at that instant. Under
memory pressure, group_a pages can be swapped between the checkpoint and
the reads, so memory.current drops while the charge remains correctly
associated with group_a in memory.swap.current. The same race affects the
group_b delta after the second allocation and can produce a false failure.

Setting memory.swap.max to 0, or otherwise keeping the pages resident, would
make the memory.current assertions measure migration accounting reliably.

Verdict - Needs revision

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