On Fri, Jul 31, 2009 at 11:21 AM, Vivek Subbarao <viveks@xxxxxxxxxxx> wrote:>weather the second process has its priority must be higher than the running one ?
Yes. Only a process of higher or same priority can pre-empt a process of lower priority.
If pre-empt_count is +ve means that i can be pre-empted then you are right.
If a lower process has taken a lock & its preempt_count value is +ve , can it be preempted by higher priority process ?
positive value of preempt_count means that kernel preemption is disabled, in that case even high priority process will not be able to preempt low priority process, people please CMIIW
From: kernelnewbies-bounce@xxxxxxxxxxxx [mailto:kernelnewbies-bounce@xxxxxxxxxxxx] On Behalf Of er krishna
Sent: 30 July 2009 14:32
To: kernelnewbies@xxxxxxxxxxxx
Subject: preemption
Dear All,
I have some confusion about preemption. Can anybody please clear my query :
1) If there are two process running in kernel space & one of them has a lock & its preempt_count value is +ve , can the other process preempt it ? If it preempt the first process ( which is in running state with a lock ) , then how ( weather the second process has its priority must be higher than the running one ? )?
Thanks & Best Regards,
Krishna
Chetan Nanda
