linux-kernel - Re: [PATCH v4 bpf-next 6/6] bpf: runqslower: use task local storage

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Message-ID: <20210223213328.muxp4vaexg7ahtmn@kafai-mbp.dhcp.thefacebook.com>
Date:   Tue, 23 Feb 2021 13:33:28 -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>, Andrii Nakryiko <andrii@...nel.org>
Subject: Re: [PATCH v4 bpf-next 6/6] bpf: runqslower: use task local storage

On Mon, Feb 22, 2021 at 05:20:14PM -0800, Song Liu wrote:
> Replace hashtab with task local storage in runqslower. This improves the
> performance of these BPF programs. The following table summarizes average
> runtime of these programs, in nanoseconds:
> 
>                           task-local   hash-prealloc   hash-no-prealloc
> handle__sched_wakeup             125             340               3124
> handle__sched_wakeup_new        2812            1510               2998
> handle__sched_switch             151             208                991
Nice!  The required code change is also minimal.