On Fri, Nov 30, 2012 at 10:38 AM, Frederic Weisbecker
wrote:
> 2012/11/28 Hakan Akkan :
>> +static int check_drop_timer_duty(int cpu)
>> +{
>> + int curr_handler, prev_handler, new_handler;
>> + int nrepeat = -1;
>> + bool drop_recheck;
>> +
>> +repeat:
>> +
2012/11/28 Hakan Akkan :
> +static int check_drop_timer_duty(int cpu)
> +{
> + int curr_handler, prev_handler, new_handler;
> + int nrepeat = -1;
> + bool drop_recheck;
> +
> +repeat:
> + WARN_ON_ONCE(++nrepeat > 1);
> + drop_recheck = false;
> + curr_handler =
2012/11/28 Hakan Akkan hakanak...@gmail.com:
+static int check_drop_timer_duty(int cpu)
+{
+ int curr_handler, prev_handler, new_handler;
+ int nrepeat = -1;
+ bool drop_recheck;
+
+repeat:
+ WARN_ON_ONCE(++nrepeat 1);
+ drop_recheck = false;
+
On Fri, Nov 30, 2012 at 10:38 AM, Frederic Weisbecker
fweis...@gmail.com wrote:
2012/11/28 Hakan Akkan hakanak...@gmail.com:
+static int check_drop_timer_duty(int cpu)
+{
+ int curr_handler, prev_handler, new_handler;
+ int nrepeat = -1;
+ bool drop_recheck;
+
+repeat:
+
(Please ignore the previous patch as it never really prevented
the last idler from going longer than timekeeping_max_deferement
sleeps.)
An adaptive nohz (AHZ) CPU may not do do_timer() for a while
despite being non-idle. When all other CPUs are idle, AHZ
CPUs might be using stale jiffies values.
An adaptive nohz (AHZ) CPU may not do do_timer() for a while
despite being non-idle. When all other CPUs are idle, AHZ
CPUs might be using stale jiffies values. To prevent this
always keep a CPU with ticks if there is one or more AHZ
CPUs.
A new function, check_drop_timer_duty, handles the
An adaptive nohz (AHZ) CPU may not do do_timer() for a while
despite being non-idle. When all other CPUs are idle, AHZ
CPUs might be using stale jiffies values. To prevent this
always keep a CPU with ticks if there is one or more AHZ
CPUs.
A new function, check_drop_timer_duty, handles the
(Please ignore the previous patch as it never really prevented
the last idler from going longer than timekeeping_max_deferement
sleeps.)
An adaptive nohz (AHZ) CPU may not do do_timer() for a while
despite being non-idle. When all other CPUs are idle, AHZ
CPUs might be using stale jiffies values.
2012/11/20 Steven Rostedt :
> On Mon, 2012-11-19 at 17:27 -0700, Hakan Akkan wrote:
>
>> >
>> > I suggest to rather define a tunable timekeeping duty CPU affinity in
>> > a cpumask file at /sys/devices/system/cpu/timekeeping and a toggle at
>> > /sys/devices/system/cpu/cpuX/timekeeping (like the
On Mon, 2012-11-19 at 17:27 -0700, Hakan Akkan wrote:
> >
> > I suggest to rather define a tunable timekeeping duty CPU affinity in
> > a cpumask file at /sys/devices/system/cpu/timekeeping and a toggle at
> > /sys/devices/system/cpu/cpuX/timekeeping (like the online file). This
> > way the user
On Mon, Nov 19, 2012 at 7:46 AM, Frederic Weisbecker wrote:
>
> Hi Hakan,
>
> As I start to focus on timekeeing for full dynticks, I'm looking at
> your patch. Sorry I haven't yet replied with a serious review until
> now. But here is it, finally:
>
> 2012/6/17 Hakan Akkan :
> > An adaptive nohz
Hi Hakan,
As I start to focus on timekeeing for full dynticks, I'm looking at
your patch. Sorry I haven't yet replied with a serious review until
now. But here is it, finally:
2012/6/17 Hakan Akkan :
> An adaptive nohz (AHZ) CPU may not do do_timer() for a while
> despite being non-idle. When
On Mon, Nov 19, 2012 at 7:46 AM, Frederic Weisbecker fweis...@gmail.com wrote:
Hi Hakan,
As I start to focus on timekeeing for full dynticks, I'm looking at
your patch. Sorry I haven't yet replied with a serious review until
now. But here is it, finally:
2012/6/17 Hakan Akkan
On Mon, 2012-11-19 at 17:27 -0700, Hakan Akkan wrote:
I suggest to rather define a tunable timekeeping duty CPU affinity in
a cpumask file at /sys/devices/system/cpu/timekeeping and a toggle at
/sys/devices/system/cpu/cpuX/timekeeping (like the online file). This
way the user can decide
2012/11/20 Steven Rostedt rost...@goodmis.org:
On Mon, 2012-11-19 at 17:27 -0700, Hakan Akkan wrote:
I suggest to rather define a tunable timekeeping duty CPU affinity in
a cpumask file at /sys/devices/system/cpu/timekeeping and a toggle at
/sys/devices/system/cpu/cpuX/timekeeping (like
Hi Hakan,
As I start to focus on timekeeing for full dynticks, I'm looking at
your patch. Sorry I haven't yet replied with a serious review until
now. But here is it, finally:
2012/6/17 Hakan Akkan hakanak...@gmail.com:
An adaptive nohz (AHZ) CPU may not do do_timer() for a while
despite being
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