On 9/3/2016 11:31 AM, Frederic Weisbecker wrote:
On Tue, Aug 30, 2016 at 02:17:27PM -0400, Chris Metcalf wrote:
On 8/30/2016 1:36 PM, Chris Metcalf wrote:
See the other thread with Peter Z for the longer discussion of this.
At this point I'm leaning towards replacing the set_tsk_need_resched()
On Tue, Aug 30, 2016 at 02:17:27PM -0400, Chris Metcalf wrote:
> On 8/30/2016 1:36 PM, Chris Metcalf wrote:
> >>>See the other thread with Peter Z for the longer discussion of this.
> >>>At this point I'm leaning towards replacing the set_tsk_need_resched() with
> >>>
> >>> set_current_state(TA
On 8/30/2016 1:10 PM, Frederic Weisbecker wrote:
On Tue, Aug 30, 2016 at 11:41:36AM -0400, Chris Metcalf wrote:
On 8/29/2016 8:55 PM, Frederic Weisbecker wrote:
On Mon, Aug 15, 2016 at 10:59:55AM -0400, Chris Metcalf wrote:
On 8/11/2016 2:50 PM, Christoph Lameter wrote:
On Thu, 11 Aug 2016, F
On 8/30/2016 1:36 PM, Chris Metcalf wrote:
See the other thread with Peter Z for the longer discussion of this.
At this point I'm leaning towards replacing the set_tsk_need_resched() with
set_current_state(TASK_INTERRUPTIBLE);
schedule();
__set_current_state(TASK_RUNNING);
I don'
On 8/29/2016 8:55 PM, Frederic Weisbecker wrote:
On Mon, Aug 15, 2016 at 10:59:55AM -0400, Chris Metcalf wrote:
On 8/11/2016 2:50 PM, Christoph Lameter wrote:
On Thu, 11 Aug 2016, Frederic Weisbecker wrote:
Do we need to quiesce vmstat everytime before entering userspace?
I thought that vmsta
On Tue, Aug 30, 2016 at 11:41:36AM -0400, Chris Metcalf wrote:
> On 8/29/2016 8:55 PM, Frederic Weisbecker wrote:
> >On Mon, Aug 15, 2016 at 10:59:55AM -0400, Chris Metcalf wrote:
> >>On 8/11/2016 2:50 PM, Christoph Lameter wrote:
> >>>On Thu, 11 Aug 2016, Frederic Weisbecker wrote:
> >>>
> Do
On Mon, Aug 15, 2016 at 10:59:55AM -0400, Chris Metcalf wrote:
> On 8/11/2016 2:50 PM, Christoph Lameter wrote:
> >On Thu, 11 Aug 2016, Frederic Weisbecker wrote:
> >
> >>Do we need to quiesce vmstat everytime before entering userspace?
> >>I thought that vmstat only need to be offlined once and fo
On 8/11/2016 2:50 PM, Christoph Lameter wrote:
On Thu, 11 Aug 2016, Frederic Weisbecker wrote:
Do we need to quiesce vmstat everytime before entering userspace?
I thought that vmstat only need to be offlined once and for all?
Once is sufficient after disabling the tick.
It's true that task_i
On Thu, 11 Aug 2016, Frederic Weisbecker wrote:
> Do we need to quiesce vmstat everytime before entering userspace?
> I thought that vmstat only need to be offlined once and for all?
Once is sufficient after disabling the tick.
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On Tue, Aug 09, 2016 at 04:29:46PM -0400, Chris Metcalf wrote:
> +/*
> + * Each time we try to prepare for return to userspace in a process
> + * with task isolation enabled, we run this code to quiesce whatever
> + * subsystems we can readily quiesce to avoid later interrupts.
> + */
> +void task_
The existing nohz_full mode is designed as a "soft" isolation mode
that makes tradeoffs to minimize userspace interruptions while
still attempting to avoid overheads in the kernel entry/exit path,
to provide 100% kernel semantics, etc.
However, some applications require a "hard" commitment from th
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