From: Alex Belits <abelits@marvell.com>
To: "frederic@kernel.org" <frederic@kernel.org>,
"rostedt@goodmis.org" <rostedt@goodmis.org>
Cc: "linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
"catalin.marinas@arm.com" <catalin.marinas@arm.com>,
"peterz@infradead.org" <peterz@infradead.org>,
Prasun Kapoor <pkapoor@marvell.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"davem@davemloft.net" <davem@davemloft.net>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linux-api@vger.kernel.org" <linux-api@vger.kernel.org>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"will@kernel.org" <will@kernel.org>,
"mingo@kernel.org" <mingo@kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: [PATCH v3 10/13] task_isolation: net: don't flush backlog on CPUs running isolated tasks
Date: Thu, 9 Apr 2020 15:26:26 +0000 [thread overview]
Message-ID: <ca337ff4e82a92d2fe22ce74232730eacfc74d96.camel@marvell.com> (raw)
In-Reply-To: <07c25c246c55012981ec0296eee23e68c719333a.camel@marvell.com>
From: Yuri Norov <ynorov@marvell.com>
If CPU runs isolated task, there's no any backlog on it, and
so we don't need to flush it. Currently flush_all_backlogs()
enqueues corresponding work on all CPUs including ones that run
isolated tasks. It leads to breaking task isolation for nothing.
In this patch, backlog flushing is enqueued only on non-isolated CPUs.
Signed-off-by: Yuri Norov <ynorov@marvell.com>
[abelits@marvell.com: use safe task_isolation_on_cpu() implementation]
Signed-off-by: Alex Belits <abelits@marvell.com>
---
net/core/dev.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/net/core/dev.c b/net/core/dev.c
index c6c985fe7b1b..353d2be39202 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -74,6 +74,7 @@
#include <linux/cpu.h>
#include <linux/types.h>
#include <linux/kernel.h>
+#include <linux/isolation.h>
#include <linux/hash.h>
#include <linux/slab.h>
#include <linux/sched.h>
@@ -5518,9 +5519,13 @@ static void flush_all_backlogs(void)
get_online_cpus();
- for_each_online_cpu(cpu)
+ smp_rmb();
+ for_each_online_cpu(cpu) {
+ if (task_isolation_on_cpu(cpu))
+ continue;
queue_work_on(cpu, system_highpri_wq,
per_cpu_ptr(&flush_works, cpu));
+ }
for_each_online_cpu(cpu)
flush_work(per_cpu_ptr(&flush_works, cpu));
--
2.20.1
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next prev parent reply other threads:[~2020-04-09 15:27 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4473787e1b6bc3cc226067e8d122092a678b63de.camel@marvell.com>
2020-03-08 3:42 ` [PATCH v2 00/12] "Task_isolation" mode Alex Belits
2020-03-08 3:44 ` [PATCH v2 01/12] task_isolation: vmstat: add quiet_vmstat_sync function Alex Belits
2020-03-08 3:46 ` [PATCH v2 02/12] task_isolation: vmstat: add vmstat_idle function Alex Belits
2020-03-08 3:47 ` [PATCH v2 03/12] task_isolation: userspace hard isolation from kernel Alex Belits
[not found] ` <20200307214254.7a8f6c22@hermes.lan>
2020-03-08 7:33 ` [EXT] " Alex Belits
2020-03-27 8:42 ` Marta Rybczynska
2020-04-06 4:31 ` Kevyn-Alexandre Paré
2020-04-06 4:43 ` Kevyn-Alexandre Paré
2020-03-08 3:48 ` [PATCH v2 04/12] task_isolation: Add task isolation hooks to arch-independent code Alex Belits
2020-03-08 3:49 ` [PATCH v2 05/12] task_isolation: arch/x86: enable task isolation functionality Alex Belits
2020-03-08 3:50 ` [PATCH v2 06/12] task_isolation: arch/arm64: " Alex Belits
2020-03-09 16:59 ` Mark Rutland
2020-03-08 3:52 ` [PATCH v2 07/12] task_isolation: arch/arm: " Alex Belits
2020-03-08 3:53 ` [PATCH v2 08/12] task_isolation: don't interrupt CPUs with tick_nohz_full_kick_cpu() Alex Belits
2020-03-08 3:54 ` [PATCH v2 09/12] task_isolation: net: don't flush backlog on CPUs running isolated tasks Alex Belits
2020-03-08 3:55 ` [PATCH v2 10/12] task_isolation: ringbuffer: don't interrupt CPUs running isolated tasks on buffer resize Alex Belits
2020-04-06 4:27 ` Kevyn-Alexandre Paré
2020-03-08 3:56 ` [PATCH v2 11/12] task_isolation: kick_all_cpus_sync: don't kick isolated cpus Alex Belits
2020-03-08 3:57 ` [PATCH v2 12/12] task_isolation: CONFIG_TASK_ISOLATION prevents distribution of jobs to non-housekeeping CPUs Alex Belits
2020-04-09 15:09 ` [PATCH v3 00/13] "Task_isolation" mode Alex Belits
2020-04-09 15:15 ` [PATCH 01/13] task_isolation: vmstat: add quiet_vmstat_sync function Alex Belits
2020-04-09 15:16 ` [PATCH 02/13] task_isolation: vmstat: add vmstat_idle function Alex Belits
2020-04-09 15:17 ` [PATCH v3 03/13] task_isolation: add instruction synchronization memory barrier Alex Belits
2020-04-15 12:44 ` Mark Rutland
2020-04-19 5:02 ` [EXT] " Alex Belits
2020-04-20 12:23 ` Will Deacon
2020-04-20 12:36 ` Mark Rutland
2020-04-20 13:55 ` Will Deacon
2020-04-21 7:41 ` Will Deacon
2020-04-20 12:45 ` Mark Rutland
2020-04-09 15:20 ` [PATCH v3 04/13] task_isolation: userspace hard isolation from kernel Alex Belits
2020-04-09 18:00 ` Andy Lutomirski
2020-04-19 5:07 ` Alex Belits
2020-04-09 15:21 ` [PATCH 05/13] task_isolation: Add task isolation hooks to arch-independent code Alex Belits
2020-04-09 15:22 ` [PATCH 06/13] task_isolation: arch/x86: enable task isolation functionality Alex Belits
2020-04-09 15:23 ` [PATCH v3 07/13] task_isolation: arch/arm64: " Alex Belits
2020-04-22 12:08 ` Catalin Marinas
2020-04-09 15:24 ` [PATCH v3 08/13] task_isolation: arch/arm: " Alex Belits
2020-04-09 15:25 ` [PATCH v3 09/13] task_isolation: don't interrupt CPUs with tick_nohz_full_kick_cpu() Alex Belits
2020-04-09 15:26 ` Alex Belits [this message]
2020-04-09 15:27 ` [PATCH v3 11/13] task_isolation: ringbuffer: don't interrupt CPUs running isolated tasks on buffer resize Alex Belits
2020-04-09 15:27 ` [PATCH v3 12/13] task_isolation: kick_all_cpus_sync: don't kick isolated cpus Alex Belits
2020-04-09 15:28 ` [PATCH v3 13/13] task_isolation: CONFIG_TASK_ISOLATION prevents distribution of jobs to non-housekeeping CPUs Alex Belits
[not found] ` <ef365b5754ffc07980ed1df6ac8531a8ff590a17.camel@marvell.com>
[not found] ` <20200304163103.GJ3575@lakrids.cambridge.arm.com>
2020-03-08 4:48 ` [EXT] Re: [PATCH 06/12] task_isolation: arch/arm64: enable task isolation functionality Alex Belits
[not found] ` <36d84b8dd168a38e6a56549dedc15dd6ebf8c09e.camel@marvell.com>
[not found] ` <20200305183313.GA29033@lenoir>
2020-03-08 5:32 ` [EXT] Re: [PATCH 03/12] task_isolation: userspace hard isolation from kernel Alex Belits
[not found] ` <20200306152632.GB8590@lenoir>
2020-03-08 6:06 ` Alex Belits
[not found] ` <dfa5e0e9f34e6ff0ef048c81bc70496354f31300.camel@marvell.com>
[not found] ` <20200306153446.GC8590@lenoir>
2020-03-08 6:48 ` [EXT] Re: [PATCH 11/12] task_isolation: kick_all_cpus_sync: don't kick isolated cpus Alex Belits
2020-03-09 2:28 ` Frederic Weisbecker
[not found] ` <d7ce01e57d4a35b126e1cb96a63109eaa9781cb6.camel@marvell.com>
[not found] ` <20200306160341.GE8590@lenoir>
2020-03-08 7:28 ` [EXT] Re: [PATCH 08/12] task_isolation: don't interrupt CPUs with tick_nohz_full_kick_cpu() Alex Belits
2020-03-09 2:38 ` Frederic Weisbecker
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