* preempt_disable and softirq
@ 2011-08-07 2:03 Venkat Subbiah
2011-08-08 13:08 ` Peter Zijlstra
0 siblings, 1 reply; 2+ messages in thread
From: Venkat Subbiah @ 2011-08-07 2:03 UTC (permalink / raw)
To: linux-kernel
Does disabling preemption by calling preempt_disable() cause softirqs
on the local cpu to be disabled too?
I believe drivers napi polling functions is being called when the
current cpu is holding on to a read lock of tasklist_lock. read_lock()
itself disables preemption.
An easy way to check in the napi polling functions that the current
cpu is not holding on to tasklist_lock? Of course this is mute if
softirqs itself cannot execute when premption is disabled.
PS: I am not subscribed to the groups. Please CC me on your answer.
Thanks,
Venkat
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: preempt_disable and softirq
2011-08-07 2:03 preempt_disable and softirq Venkat Subbiah
@ 2011-08-08 13:08 ` Peter Zijlstra
0 siblings, 0 replies; 2+ messages in thread
From: Peter Zijlstra @ 2011-08-08 13:08 UTC (permalink / raw)
To: Venkat Subbiah; +Cc: linux-kernel
On Sat, 2011-08-06 at 19:03 -0700, Venkat Subbiah wrote:
> Does disabling preemption by calling preempt_disable() cause softirqs
> on the local cpu to be disabled too?
No.
^ permalink raw reply [flat|nested] 2+ messages in thread
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