On 2026/1/14 10:33 Alexei Starovoitov [off-list ref] write:

On Tue, Jan 13, 2026 at 5:24 PM Andrii Nakryiko
[off-list ref] wrote:

quoted

On Sat, Jan 10, 2026 at 6:12 AM Menglong Dong [off-list ref] wrote:

quoted

Implement session cookie for fsession. In order to limit the stack usage,
we make 4 as the maximum of the cookie count.

This 4 is so random, tbh. Do we need to artificially limit it? Even if
all BPF_MAX_TRAMP_LINKS = 38 where using session cookies, it would be
304 bytes. Not insignificant, but also not world-ending and IMO so
unlikely that I wouldn't add extra limits at all.

I forgot that we already have BPF_MAX_TRAMP_LINKS limit for the total
number of progs. I guess extra 8 bytes per fsession prog isn't that bad.

Ah, so it's OK to not limit the session cookie. I'll remove such limitation
in the next version.

Thanks!
Menglong Dong