This is a note to let you know that I've just added the patch titled
erofs: use HIPRI by default if per-cpu kthreads are enabled
to the 6.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
erofs-use-hipri-by-default-if-per-cpu-kthreads-are-e.patch
and it can be found in the queue-6.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit aae75245ac4f6dbd1483554a652ed020fb3514be
Author: Gao Xiang <xiang@xxxxxxxxxx>
Date: Mon May 22 17:21:41 2023 +0800
erofs: use HIPRI by default if per-cpu kthreads are enabled
[ 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@xxxxxxxxxxxxxx
Reviewed-by: Yue Hu <huyue2@xxxxxxxxxxx>
Reviewed-by: Sandeep Dhavale <dhavale@xxxxxxxxxx>
Reviewed-by: Chao Yu <chao@xxxxxxxxxx>
Signed-off-by: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230522092141.124290-1-hsiangkao@xxxxxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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;
}
