linux-kernel - Re: [PATCH 14/31] sched_ext: Implement BPF extensible scheduler class

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <alpine.DEB.2.22.394.2212112331150.29296@hadrien>
Date:   Sun, 11 Dec 2022 23:33:50 +0100 (CET)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     Tejun Heo <tj@...nel.org>
cc:     torvalds@...ux-foundation.org, mingo@...hat.com,
        peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, vschneid@...hat.com, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, martin.lau@...nel.org,
        joshdon@...gle.com, brho@...gle.com, pjt@...gle.com,
        derkling@...gle.com, haoluo@...gle.com, dvernet@...a.com,
        dschatzberg@...a.com, dskarlat@...cmu.edu, riel@...riel.com,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
        kernel-team@...a.com
Subject: Re: [PATCH 14/31] sched_ext: Implement BPF extensible scheduler
 class

> diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
> new file mode 100644
> index 000000000000..f42464d66de4
> --- /dev/null
> +++ b/kernel/sched/ext.c
> @@ -0,0 +1,2780 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (c) 2022 Meta Platforms, Inc. and affiliates.
> + * Copyright (c) 2022 Tejun Heo <tj@...nel.org>
> + * Copyright (c) 2022 David Vernet <dvernet@...a.com>
> + */
> +#define SCX_OP_IDX(op)		(offsetof(struct sched_ext_ops, op) / sizeof(void (*)(void)))
> +
> +enum scx_internal_consts {
> +	SCX_NR_ONLINE_OPS	 = SCX_OP_IDX(init),
> +	SCX_DSP_DFL_MAX_BATCH	 = 32,

This definition of SCX_DSP_DFL_MAX_BATCH makes the dispatch queue have size
32.  The example central policy thus aborts if more than 32 tasks are woken
up at once.

julia