linux-kernel - [PATCH] sched/isolation: add a workqueue parameter to constrain unbound CPUs

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-next>] [day] [month] [year] [list]

Message-ID: <20230613092819.GA18487@didi-ThinkCentre-M930t-N000>
Date:   Tue, 13 Jun 2023 17:28:19 +0800
From:   tiozhang <tiozhang@...iglobal.com>
To:     <mingo@...hat.com>, <peterz@...radead.org>,
        <juri.lelli@...hat.com>, <vincent.guittot@...aro.org>,
        <tj@...nel.org>
CC:     <dietmar.eggemann@....com>, <rostedt@...dmis.org>,
        <bsegall@...gle.com>, <mgorman@...e.de>, <bristot@...hat.com>,
        <vschneid@...hat.com>, <zyhtheonly@...il.com>,
        <tiozhang@...iglobal.com>, <zwp10758@...il.com>,
        <fuyuanli@...iglobal.com>, <zyhtheonly@...h.net>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] sched/isolation: add a workqueue parameter to constrain
 unbound CPUs

Motivation of doing this is to better improve boot times for devices when
we want to prevent our workqueue works from running on some specific CPUs,
i,e, some CPUs are busy with interrupts.

Suggested-by: Tejun Heo <tj@...nel.org>
Signed-off-by: tiozhang <tiozhang@...iglobal.com>
---
 kernel/sched/isolation.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c
index 373d42c707bc..85e744c1349a 100644
--- a/kernel/sched/isolation.c
+++ b/kernel/sched/isolation.c
@@ -208,6 +208,12 @@ static int __init housekeeping_isolcpus_setup(char *str)
 			continue;
 		}
 
+		if (!strncmp(str, "workqueue,", 10)) {
+			str += 10;
+			flags |= HK_FLAG_WQ;
+			continue;
+		}
+
 		if (!strncmp(str, "managed_irq,", 12)) {
 			str += 12;
 			flags |= HK_FLAG_MANAGED_IRQ;
-- 
2.17.1