Re: [RFC PATCH] mm: use precise current RSS for high-water accounting

[Nirmoy Das]

Hi Mathieu,

On 2026-07-23 12:31, Mathieu Desnoyers wrote:
> What is this test validating ? Does it actually matter for a real-life
> use-case, or is it just the test being too strict ?

It tests getrusage(RUSAGE_CHILDREN).ru_maxrss:

https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/syscalls/getrusage/getrusage03.c

I am not sure about a real-world use-case; I do not have one.

> What is the overhead impact of your change from approximated counter
> read to a precise sum on this /proc ABI ?

I have not benchmarked the overhead yet. I will get back on this. 

Thanks,
Nirmoy