Re: The timer softirq on the RT kernel

[yunhong jiang]

On Fri, 05 Aug 2016 04:36:23 +0200
Mike Galbraith  wrote:

> On Thu, 2016-08-04 at 17:36 -0700, yunhong jiang wrote:
> > Hi,Mike & Steven
> > On https://lkml.org/lkml/2015/3/24/1178, the patch of
> > "timers: do not raise softirq unconditionally" is reverted. Thanks
> > for Steven's
> > detailed comments, it's quite clear explained.
> > I remember Mike has a patch trying to fix it but late
> > abandoned. Do you still have any plan to work on this? Otherwise, I
> > will have a try.
> 
> Sebastian converted the lock to raw in -rt, so nohz_full now works
> without any extra hackery.

Hi, Mike, thanks for reply and the update. I still noticed timer softirq
on my isolated CPUs, possibly something wrong on my environment. I will
re-check it.

Thanks
--jyh

> 
>   -Mike

Re: The timer softirq on the RT kernel

[yunhong jiang]

On Fri, 05 Aug 2016 04:36:23 +0200
Mike Galbraith  wrote:

> On Thu, 2016-08-04 at 17:36 -0700, yunhong jiang wrote:
> > Hi,Mike & Steven
> > On https://lkml.org/lkml/2015/3/24/1178, the patch of
> > "timers: do not raise softirq unconditionally" is reverted. Thanks
> > for Steven's
> > detailed comments, it's quite clear explained.
> > I remember Mike has a patch trying to fix it but late
> > abandoned. Do you still have any plan to work on this? Otherwise, I
> > will have a try.
> 
> Sebastian converted the lock to raw in -rt, so nohz_full now works
> without any extra hackery.

Hi, Mike, thanks for reply and the update. I still noticed timer softirq
on my isolated CPUs, possibly something wrong on my environment. I will
re-check it.

Thanks
--jyh

> 
>   -Mike

Re: The timer softirq on the RT kernel

[Mike Galbraith]

On Thu, 2016-08-04 at 17:36 -0700, yunhong jiang wrote:
> Hi,Mike & Steven
>   On https://lkml.org/lkml/2015/3/24/1178, the patch of "timers:
> do not raise softirq unconditionally" is reverted. Thanks for
> Steven's
> detailed comments, it's quite clear explained.
>   I remember Mike has a patch trying to fix it but late
> abandoned. Do you still have any plan to work on this? Otherwise, I
> will have a try.

Sebastian converted the lock to raw in -rt, so nohz_full now works
without any extra hackery.

-Mike

Re: The timer softirq on the RT kernel

[Mike Galbraith]

On Thu, 2016-08-04 at 17:36 -0700, yunhong jiang wrote:
> Hi,Mike & Steven
>   On https://lkml.org/lkml/2015/3/24/1178, the patch of "timers:
> do not raise softirq unconditionally" is reverted. Thanks for
> Steven's
> detailed comments, it's quite clear explained.
>   I remember Mike has a patch trying to fix it but late
> abandoned. Do you still have any plan to work on this? Otherwise, I
> will have a try.

Sebastian converted the lock to raw in -rt, so nohz_full now works
without any extra hackery.

-Mike

The timer softirq on the RT kernel

[yunhong jiang]

Hi,Mike & Steven
On https://lkml.org/lkml/2015/3/24/1178, the patch of "timers:
do not raise softirq unconditionally" is reverted. Thanks for Steven's
detailed comments, it's quite clear explained.
I remember Mike has a patch trying to fix it but late
abandoned. Do you still have any plan to work on this? Otherwise, I
will have a try.

Thanks
--jyh

The timer softirq on the RT kernel

[yunhong jiang]

Hi,Mike & Steven
On https://lkml.org/lkml/2015/3/24/1178, the patch of "timers:
do not raise softirq unconditionally" is reverted. Thanks for Steven's
detailed comments, it's quite clear explained.
I remember Mike has a patch trying to fix it but late
abandoned. Do you still have any plan to work on this? Otherwise, I
will have a try.

Thanks
--jyh