Re: [PATCH] memcg: net: track network throttling due to memcg memory pressure

[Daniel Sedlak <daniel.sedlak@cdn77.com>]

On 10/16/25 3:31 AM, Shakeel Butt wrote:
> The kernel can throttle network sockets if the memory cgroup associated
> with the corresponding socket is under memory pressure. The throttling
> actions include clamping the transmit window, failing to expand receive
> or send buffers, aggressively prune out-of-order receive queue, FIN
> deferred to a retransmitted packet and more. Let's add memcg metric to
> indicate track such throttling actions.
> 
> At the moment memcg memory pressure is defined through vmpressure and in
> future it may be defined using PSI or we may add more flexible way for
> the users to define memory pressure, maybe through ebpf. However the
> potential throttling actions will remain the same, so this newly
> introduced metric will continue to track throttling actions irrespective
> of how memcg memory pressure is defined.
> 
> Signed-off-by: Shakeel Butt <shakeel.butt@linux.dev>

Reviewed-by: Daniel Sedlak <daniel.sedlak@cdn77.com>

I am curious how the future work will unfold. If you need help with 
future developments I can help you, we have hundreds of servers where 
this throttling is happening.

Thanks!
Daniel