Re: __GFP_REPEAT usage in fq_alloc_node

[Eric Dumazet]

On Fri, Jan 6, 2017 at 7:20 AM, Michal Hocko <mhocko@xxxxxxxxxx> wrote:
>
> Hi Eric,
> I am currently checking kmalloc with vmalloc fallback users and convert
> them to a new kvmalloc helper [1]. While I am adding a support for
> __GFP_REPEAT to kvmalloc [2] I was wondering what is the reason to use
> __GFP_REPEAT in fq_alloc_node in the first place. c3bd85495aef
> ("pkt_sched: fq: more robust memory allocation") doesn't mention
> anything. Could you clarify this please?
>
> Thanks!

I guess this question applies to all __GFP_REPEAT usages in net/ ?

At the time, tests on the hardware I had in my labs showed that
vmalloc() could deliver pages spread
all over the memory and that was a small penalty (once memory is
fragmented enough, not at boot time)

I guess this wont be anymore a concern if I can finish my pending work
about vmalloc() trying to get adjacent pages
https://lkml.org/lkml/2016/12/21/285

Thanks.