linux-kernel - Re: [PATCH bpf-next v2 1/2] bpf: Add ability to pin bpf timer to calling CPU

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Message-ID: <ade7f8d5-11fe-5995-b50b-5a4e767fe871@huaweicloud.com>
Date:   Sun, 8 Oct 2023 12:09:07 +0800
From:   Hou Tao <houtao@...weicloud.com>
To:     David Vernet <void@...ifault.com>, bpf@...r.kernel.org
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        martin.lau@...ux.dev, song@...nel.org, yonghong.song@...ux.dev,
        john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
        haoluo@...gle.com, jolsa@...nel.org, linux-kernel@...r.kernel.org,
        kernel-team@...a.com
Subject: Re: [PATCH bpf-next v2 1/2] bpf: Add ability to pin bpf timer to
 calling CPU



On 10/5/2023 12:23 AM, David Vernet wrote:
> BPF supports creating high resolution timers using bpf_timer_* helper
> functions. Currently, only the BPF_F_TIMER_ABS flag is supported, which
> specifies that the timeout should be interpreted as absolute time. It
> would also be useful to be able to pin that timer to a core. For
> example, if you wanted to make a subset of cores run without timer
> interrupts, and only have the timer be invoked on a single core.
>
> This patch adds support for this with a new BPF_F_TIMER_CPU_PIN flag.
> When specified, the HRTIMER_MODE_PINNED flag is passed to
> hrtimer_start(). A subsequent patch will update selftests to validate.
>
> Acked-by: Song Liu <song@...nel.org>
> Signed-off-by: David Vernet <void@...ifault.com>

Acked-by: Hou Tao <houtao1@...wei.com>