[LTP] madvise09: Scale cgroup memory/swap limits dynamically with page size

[linuxtestproject.agent@gmail.com]

Hi Wei,

On 2026-07-23, Wei Gao wrote:
> madvise09: Scale cgroup memory/swap limits dynamically with page size

> * o Set memory limits
> *   - memory.max = 8MB
> *   - memory.swap.max = 16MB

Now that mem_limit and swap_limit are derived from page_size at
runtime, are these values still accurate for the description block?
On a 64KB page system mem_limit becomes 128MB and swap_limit 256MB,
but the doc comment still states the old fixed 8MB/16MB.

> +	if (tst_available_swap() < swap_limit / 1024) {
> +		tst_brk(TCONF, "System needs at least %ldMB free swap to run this test",
> +			swap_limit / TST_MB);
> +	}

This check runs unconditionally in setup(), but swap_limit is only
ever written to memory.swap.max when swap_accounting_enabled is true;
otherwise child() takes the "running without SWAP_LIMIT" path and
never enforces it. Could this needlessly skip the test (TCONF) on
systems with swap accounting disabled but with less free swap than
swap_limit, even though swap_limit isn't used there?

Verdict - Needs revision

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