vfree during RCU

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Hi,


Given ruleset sizes, using kmalloc proves to be difficult currently, so 
vfree is generally used. I tried hooking that up with RCU, but quickly 
found that vfree in RCU is a bad idea. What comes to mind to solve this 
is to use an extra kthread which can tolerate sleeping. Do you know of 
ideas preferable to a cleaning-up kthread?

Jan
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