netdev - Re: [PATCH bpf-next v2 2/9] bpf: add bpf_get

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Message-ID: <20180419042607.4h3mkwlh4qk5q4ja@ast-mbp>
Date:   Wed, 18 Apr 2018 21:26:09 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Yonghong Song <yhs@...com>
Cc:     ast@...com, daniel@...earbox.net, netdev@...r.kernel.org,
        kernel-team@...com
Subject: Re: [PATCH bpf-next v2 2/9] bpf: add bpf_get_stack helper

On Wed, Apr 18, 2018 at 09:54:37AM -0700, Yonghong Song wrote:
> Currently, stackmap and bpf_get_stackid helper are provided
> for bpf program to get the stack trace. This approach has
> a limitation though. If two stack traces have the same hash,
> only one will get stored in the stackmap table,
> so some stack traces are missing from user perspective.
> 
> This patch implements a new helper, bpf_get_stack, will
> send stack traces directly to bpf program. The bpf program
> is able to see all stack traces, and then can do in-kernel
> processing or send stack traces to user space through
> shared map or bpf_perf_event_output.
> 
> Signed-off-by: Yonghong Song <yhs@...com>

lgtm
Acked-by: Alexei Starovoitov <ast@...nel.org>