From: Martin KaFai Lau <kafai@fb.com>
To: Song Liu <songliubraving@fb.com>
Cc: <bpf@vger.kernel.org>, <netdev@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <ast@kernel.org>,
<daniel@iogearbox.net>, <kernel-team@fb.com>,
<peterz@infradead.org>, Andrii Nakryiko <andrii@kernel.org>
Subject: Re: [PATCH v4 bpf-next 6/6] bpf: runqslower: use task local storage
Date: Tue, 23 Feb 2021 13:33:28 -0800 [thread overview]
Message-ID: <20210223213328.muxp4vaexg7ahtmn@kafai-mbp.dhcp.thefacebook.com> (raw)
In-Reply-To: <20210223012014.2087583-7-songliubraving@fb.com>
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.
prev parent reply other threads:[~2021-02-23 21:34 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-23 1:20 [PATCH v4 bpf-next 0/6] bpf: enable task local storage for tracing programs Song Liu
2021-02-23 1:20 ` [PATCH v4 bpf-next 1/6] " Song Liu
2021-02-23 3:08 ` kernel test robot
2021-02-23 4:04 ` kernel test robot
2021-02-23 19:23 ` Martin KaFai Lau
2021-02-23 20:51 ` Song Liu
2021-02-23 1:20 ` [PATCH v4 bpf-next 2/6] bpf: prevent deadlock from recursive bpf_task_storage_[get|delete] Song Liu
2021-02-23 6:21 ` Andrii Nakryiko
2021-02-23 7:16 ` Song Liu
2021-02-23 7:19 ` Andrii Nakryiko
2021-02-23 16:44 ` Alexei Starovoitov
2021-02-23 11:06 ` Peter Zijlstra
2021-02-23 20:49 ` Song Liu
2021-02-23 1:20 ` [PATCH v4 bpf-next 3/6] selftests/bpf: add non-BPF_LSM test for task local storage Song Liu
2021-02-23 1:20 ` [PATCH v4 bpf-next 4/6] selftests/bpf: test deadlock from recursive bpf_task_storage_[get|delete] Song Liu
2021-02-23 1:20 ` [PATCH v4 bpf-next 5/6] bpf: runqslower: prefer using local vmlimux to generate vmlinux.h Song Liu
2021-02-23 6:26 ` Andrii Nakryiko
2021-02-23 21:24 ` Martin KaFai Lau
2021-02-23 1:20 ` [PATCH v4 bpf-next 6/6] bpf: runqslower: use task local storage Song Liu
2021-02-23 21:33 ` Martin KaFai Lau [this message]
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