netdev - Re: [PATCH bpf-next 1/4] bpf: enable program stats

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Date:   Fri, 22 Feb 2019 18:29:39 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>, davem@...emloft.net,
        daniel@...earbox.net, netdev@...r.kernel.org, bpf@...r.kernel.org,
        kernel-team@...com
Subject: Re: [PATCH bpf-next 1/4] bpf: enable program stats

On Fri, Feb 22, 2019 at 04:05:55PM -0800, Eric Dumazet wrote:
> 
> 
> On 02/22/2019 03:36 PM, Alexei Starovoitov wrote:
> 
> >  
> > +static void bpf_prog_get_stats(const struct bpf_prog *prog,
> > +			       struct bpf_prog_stats *stats)
> > +{
> > +	u64 nsecs = 0, cnt = 0;
> > +	int cpu;
> > +
> > +	for_each_possible_cpu(cpu) {
> > +		nsecs += per_cpu(prog->aux->stats->nsecs, cpu);
> > +		cnt += per_cpu(prog->aux->stats->cnt, cpu);
> 
> This does not work reliably for 32 bit kernels.

right. my mind was in probe_read thread. will fix.