Re: [PATCH v3 bpf-next/net 5/5] selftest: bpf: Add test for SK_BPF_MEMCG_SOCK_ISOLATED.

On Wed, Aug 27, 2025 at 5:14 PM Martin KaFai Lau [off-list ref] wrote:

On 8/26/25 11:38 AM, Kuniyuki Iwashima wrote:

quoted

The test does the following for IPv4/IPv6 x TCP/UDP sockets
with/without BPF prog.

   1. Create socket pairs
   2. Send a bunch of data that require more than 1000 pages
   3. Read memory_allocated from the 3rd column in /proc/net/protocols
   4. Check if unread data is charged to memory_allocated

If BPF prog is attached, memory_allocated should not be changed,
but we allow a small error (up to 10 pages) in case the test is ran
concurrently with other tests using TCP/UDP sockets.

hmm... there is a "./test_progs -j" that multiple tests can run in parallel.
Will it be reliable enough or it needs the "serial_" prefix in the test
function?

Didn't know the prefix, sounds useful :)

Beside, the test took ~20s in my qemu. Is it feasible to shorten the test?

Same on my qemu setup, and I think it's feasible with serial_.

Currently, the test consumes 2000> pages for each TCP/UDP
case, but this was just to make it more reliable on uncertain env.