linux-kernel - [PATCH AUTOSEL 6.3 27/37] erofs: use HIPRI by default if per-cpu kthreads are enabled

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Message-Id: <20230531134020.3383253-27-sashal@kernel.org>
Date:   Wed, 31 May 2023 09:40:09 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Gao Xiang <hsiangkao@...ux.alibaba.com>,
        Yue Hu <huyue2@...lpad.com>,
        Sandeep Dhavale <dhavale@...gle.com>,
        Chao Yu <chao@...nel.org>, Sasha Levin <sashal@...nel.org>,
        xiang@...nel.org, linux-erofs@...ts.ozlabs.org
Subject: [PATCH AUTOSEL 6.3 27/37] erofs: use HIPRI by default if per-cpu kthreads are enabled

From: Gao Xiang <hsiangkao@...ux.alibaba.com>

[ Upstream commit cf7f2732b4b83026842832e7e4e04bf862108ac2 ]

As Sandeep shown [1], high priority RT per-cpu kthreads are
typically helpful for Android scenarios to minimize the scheduling
latencies.

Switch EROFS_FS_PCPU_KTHREAD_HIPRI on by default if
EROFS_FS_PCPU_KTHREAD is on since it's the typical use cases for
EROFS_FS_PCPU_KTHREAD.

Also clean up unneeded sched_set_normal().

[1] https://lore.kernel.org/r/CAB=BE-SBtO6vcoyLNA9F-9VaN5R0t3o_Zn+FW8GbO6wyUqFneQ@mail.gmail.com

Reviewed-by: Yue Hu <huyue2@...lpad.com>
Reviewed-by: Sandeep Dhavale <dhavale@...gle.com>
Reviewed-by: Chao Yu <chao@...nel.org>
Signed-off-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
Link: https://lore.kernel.org/r/20230522092141.124290-1-hsiangkao@linux.alibaba.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/erofs/Kconfig | 1 +
 fs/erofs/zdata.c | 2 --
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/erofs/Kconfig b/fs/erofs/Kconfig
index 704fb59577e09..f259d92c97207 100644
--- a/fs/erofs/Kconfig
+++ b/fs/erofs/Kconfig
@@ -121,6 +121,7 @@ config EROFS_FS_PCPU_KTHREAD
 config EROFS_FS_PCPU_KTHREAD_HIPRI
 	bool "EROFS high priority per-CPU kthread workers"
 	depends on EROFS_FS_ZIP && EROFS_FS_PCPU_KTHREAD
+	default y
 	help
 	  This permits EROFS to configure per-CPU kthread workers to run
 	  at higher priority.
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index f1708c77a9912..d7add72a09437 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -369,8 +369,6 @@ static struct kthread_worker *erofs_init_percpu_worker(int cpu)
 		return worker;
 	if (IS_ENABLED(CONFIG_EROFS_FS_PCPU_KTHREAD_HIPRI))
 		sched_set_fifo_low(worker->task);
-	else
-		sched_set_normal(worker->task, 0);
 	return worker;
 }
 
-- 
2.39.2