netdev - RE: [PATCH v3 bpf-next 3/9] bpf: extend is_branch

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Message-ID: <5d0b2126214c3_12352ac65c3c65c06a@john-XPS-13-9370.notmuch>
Date:   Wed, 19 Jun 2019 23:01:10 -0700
From:   John Fastabend <john.fastabend@...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 v3 bpf-next 3/9] bpf: extend is_branch_taken to registers

Alexei Starovoitov wrote:
> This patch extends is_branch_taken() logic from JMP+K instructions
> to JMP+X instructions.
> Conditional branches are often done when src and dst registers
> contain known scalars. In such case the verifier can follow
> the branch that is going to be taken when program executes.
> That speeds up the verification and is essential feature to support
> bounded loops.
> 
> Signed-off-by: Alexei Starovoitov <ast@...nel.org>
> Acked-by: Andrii Nakryiko <andriin@...com>
> ---

Acked-by: John Fastabend <john.fastabend@...il.com>