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

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Date:   Fri, 22 Feb 2019 16:05:55 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Alexei Starovoitov <ast@...nel.org>, davem@...emloft.net
Cc:     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 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.

> +	}
> +	stats->nsecs = nsecs;
> +	stats->cnt = cnt;
> +}