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Re: [PATCH RESEND] rtsx_usb_ms: Use msleep_interruptible() in polling loop

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  Re: [PATCH RESEND] rtsx_usb_ms: Use msleep_interruptible() in  polling loop Lee Jones <lee.jones@linaro.org> - 2015-10-08 09:20 +0200
    Re: [PATCH RESEND] rtsx_usb_ms: Use msleep_interruptible() in  polling loop Ben Hutchings <ben@decadent.org.uk> - 2015-10-08 21:40 +0200
      Re: [PATCH RESEND] rtsx_usb_ms: Use msleep_interruptible() in  polling loop Lee Jones <lee.jones@linaro.org> - 2015-10-09 09:20 +0200

#1242012 — Re: [PATCH RESEND] rtsx_usb_ms: Use msleep_interruptible() in polling loop

On Mon, 28 Sep 2015, Ben Hutchings wrote:

> rtsx_usb_ms creates a task that mostly sleeps, but tasks in
> uninterruptible sleep still contribute to the load average (for
> bug-compatibility with Unix).  A load average of ~1 on a system that
> should be idle is somewhat alarming.
> 
> Change the sleep to be interruptible, but still ignore signals.
> 
> A better fix might be to replace this loop with a delayed work item.
> 
> References: https://bugs.debian.org/765717
> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

Any chance you can use Git instead of Quilt?  Failing that, is there a
way to tell Quilt to supply a diffstat in the patch?

> ---
> --- a/drivers/memstick/host/rtsx_usb_ms.c
> +++ b/drivers/memstick/host/rtsx_usb_ms.c
> @@ -706,7 +706,8 @@ poll_again:
>  		if (host->eject)
>  			break;
>  
> -		msleep(1000);
> +		if (msleep_interruptible(1000))
> +			flush_signals(current);
>  	}
>  
>  	complete(&host->detect_ms_exit);



-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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#1242702

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On Thu, 2015-10-08 at 08:19 +0100, Lee Jones wrote:
> On Mon, 28 Sep 2015, Ben Hutchings wrote:
> 
> > rtsx_usb_ms creates a task that mostly sleeps, but tasks in
> > uninterruptible sleep still contribute to the load average (for
> > bug-compatibility with Unix).  A load average of ~1 on a system that
> > should be idle is somewhat alarming.
> > 
> > Change the sleep to be interruptible, but still ignore signals.
> > 
> > A better fix might be to replace this loop with a delayed work item.
> > 
> > References: https://bugs.debian.org/765717
> > Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
> 
> Any chance you can use Git instead of Quilt?  Failing that, is there a
> way to tell Quilt to supply a diffstat in the patch?

Why does it matter?  'git am' is happy to apply it.  But in case it
really does make a difference, I've attached the git-format-patch
version.

Ben.

> > ---
> > --- a/drivers/memstick/host/rtsx_usb_ms.c
> > +++ b/drivers/memstick/host/rtsx_usb_ms.c
> > @@ -706,7 +706,8 @@ poll_again:
> >  > > 	> > 	> > if (host->eject)
> >  > > 	> > 	> > 	> > break;
> >  
> > -> > 	> > 	> > msleep(1000);
> > +> > 	> > 	> > if (msleep_interruptible(1000))
> > +> > 	> > 	> > 	> > flush_signals(current);
> >  > > 	> > }
> >  
> >  > > 	> > complete(&host->detect_ms_exit);
> 
> 
> 
-- 
Ben Hutchings
Once a job is fouled up, anything done to improve it makes it worse.

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#1243078

On Thu, 08 Oct 2015, Ben Hutchings wrote:

> On Thu, 2015-10-08 at 08:19 +0100, Lee Jones wrote:
> > On Mon, 28 Sep 2015, Ben Hutchings wrote:
> > 
> > > rtsx_usb_ms creates a task that mostly sleeps, but tasks in
> > > uninterruptible sleep still contribute to the load average (for
> > > bug-compatibility with Unix).  A load average of ~1 on a system that
> > > should be idle is somewhat alarming.
> > > 
> > > Change the sleep to be interruptible, but still ignore signals.
> > > 
> > > A better fix might be to replace this loop with a delayed work item.
> > > 
> > > References: https://bugs.debian.org/765717
> > > Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
> > 
> > Any chance you can use Git instead of Quilt?  Failing that, is there a
> > way to tell Quilt to supply a diffstat in the patch?
> 
> Why does it matter?

To this patch?  It probably doesn't.

In general?  It absolutely helps with patch review -- it's the second
thing I look at.  Diffstats are especially helpful if/when patches
cross subsystem boundaries or when multiple files a touched.  Until I
scroll down I have no idea if this is just a memstick patch (which I
can see at the bottom of my screen) or in fact amends 5 subsystems
and requires special handling.

> 'git am' is happy to apply it.  But in case it
> really does make a difference, I've attached the git-format-patch
> version.

I meant more 'from now on', rather than that patch being a special
case.  Ultimately it's your decision.  I just think it makes things
that little bit easier for the reviewer, as I'm sure you can
appreciate.

> > > ---
> > > --- a/drivers/memstick/host/rtsx_usb_ms.c
> > > +++ b/drivers/memstick/host/rtsx_usb_ms.c
> > > @@ -706,7 +706,8 @@ poll_again:
> > >  > > 	> > 	> > if (host->eject)
> > >  > > 	> > 	> > 	> > break;
> > >  
> > > -> > 	> > 	> > msleep(1000);
> > > +> > 	> > 	> > if (msleep_interruptible(1000))
> > > +> > 	> > 	> > 	> > flush_signals(current);
> > >  > > 	> > }
> > >  
> > >  > > 	> > complete(&host->detect_ms_exit);
> > 
> > 
> > 

> From 34dca6b208a1108a9499412f584468b31ee025e0 Mon Sep 17 00:00:00 2001
> From: Ben Hutchings <ben@decadent.org.uk>
> Date: Sun, 26 Oct 2014 03:39:42 +0000
> Subject: [PATCH] rtsx_usb_ms: Use msleep_interruptible() in polling loop
> 
> rtsx_usb_ms creates a task that mostly sleeps, but tasks in
> uninterruptible sleep still contribute to the load average (for
> bug-compatibility with Unix).  A load average of ~1 on a system that
> should be idle is somewhat alarming.
> 
> Change the sleep to be interruptible, but still ignore signals.
> 
> A better fix might be to replace this loop with a delayed work item.
> 
> References: https://bugs.debian.org/765717
> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
> ---
>  drivers/memstick/host/rtsx_usb_ms.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/memstick/host/rtsx_usb_ms.c b/drivers/memstick/host/rtsx_usb_ms.c
> index 1105db2..645dede 100644
> --- a/drivers/memstick/host/rtsx_usb_ms.c
> +++ b/drivers/memstick/host/rtsx_usb_ms.c
> @@ -706,7 +706,8 @@ poll_again:
>  		if (host->eject)
>  			break;
>  
> -		msleep(1000);
> +		if (msleep_interruptible(1000))
> +			flush_signals(current);
>  	}
>  
>  	complete(&host->detect_ms_exit);




-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

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