netdev - Re: [PATCH v6 bpf-next 0/6] bpf: enable task local storage for tracing programs

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Message-ID: <20210226000344.a6aud7aaimrc6wzt@kafai-mbp.dhcp.thefacebook.com>
Date:   Thu, 25 Feb 2021 16:03:44 -0800
From:   Martin KaFai Lau <kafai@...com>
To:     Song Liu <songliubraving@...com>
CC:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <ast@...nel.org>,
        <daniel@...earbox.net>, <kernel-team@...com>,
        <peterz@...radead.org>
Subject: Re: [PATCH v6 bpf-next 0/6] bpf: enable task local storage for
 tracing programs

On Thu, Feb 25, 2021 at 03:43:13PM -0800, Song Liu wrote:
> This set enables task local storage for non-BPF_LSM programs.
> 
> It is common for tracing BPF program to access per-task data. Currently,
> these data are stored in hash tables with pid as the key. In
> bcc/libbpftools [1], 9 out of 23 tools use such hash tables. However,
> hash table is not ideal for many use case. Task local storage provides
> better usability and performance for BPF programs. Please refer to 6/6 for
> some performance comparison of task local storage vs. hash table.
Thanks for the patches.

Acked-by: Martin KaFai Lau <kafai@...com>