Hi Juergen,
On 10/2/19 2:56 PM, Jürgen Groß wrote:
On 02.10.19 09:27, Juergen Gross wrote:
When switching sched units synchronize all vcpus of the new unit to be
scheduled at the same time.
A variable sched_granularity is added which holds the number of vcpus
per schedule unit.
As tasklets require to schedule the idle unit it is required to set the
tasklet_work_scheduled parameter of do_schedule() to true if any cpu
covered by the current schedule() call has any pending tasklet work.
For joining other vcpus of the schedule unit we need to add a new
softirq SCHED_SLAVE_SOFTIRQ in order to have a way to initiate a
context switch without calling the generic schedule() function
selecting the vcpu to switch to, as we already know which vcpu we
want to run. This has the other advantage not to loose any other
concurrent SCHEDULE_SOFTIRQ events.
Signed-off-by: Juergen Gross <jgr...@suse.com>
Reviewed-by: Dario Faggioli <dfaggi...@suse.com>
Acked-by: Jan Beulich <jbeul...@suse.com>
Julien gave is Acked-by via IRC.
FAOD, this is assuming patch #8 is going to be fixed to prevent a latent
bug when context_switch() is returning (such as on Arm).
Cheers,
--
Julien Grall
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