linux-kernel - Re: [PATCH] erofs: use HIPRI by default if per-cpu kthreads are enabled

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Date:   Tue, 23 May 2023 10:05:58 +0800
From:   Yue Hu <zbestahu@...il.com>
To:     Gao Xiang <hsiangkao@...ux.alibaba.com>
Cc:     linux-erofs@...ts.ozlabs.org, LKML <linux-kernel@...r.kernel.org>,
        Sandeep Dhavale <dhavale@...gle.com>, huyue2@...lpad.com,
        zhangwen@...lpad.com
Subject: Re: [PATCH] erofs: use HIPRI by default if per-cpu kthreads are
 enabled

On Tue, 23 May 2023 09:53:06 +0800
Gao Xiang <hsiangkao@...ux.alibaba.com> wrote:

> On 2023/5/23 17:52, Yue Hu wrote:
> > On Mon, 22 May 2023 17:21:41 +0800
> > Gao Xiang <hsiangkao@...ux.alibaba.com> wrote:
> >   
> >> 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
> >> Cc: Sandeep Dhavale <dhavale@...gle.com>
> >> Signed-off-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
> >> ---
> >>   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 704fb59577e0..f259d92c9720 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  
> > 
> > How about removing this config option?  
> 
> I tend to leave it as is.

Okay.

Reviewed-by: Yue Hu <huyue2@...lpad.com>

> 
> Thanks,
> Gao Xiang