2.6版内核有个4K instead 8K,请教

bing

kernel hacking 最后一项

Use 4Kb for kernel stacks instead of 8Kb (4KSTACKS)

If you say Y here the kernel will use a 4Kb stacksize for the
kernel stack attached to each process/thread. This facilitates
running more threads on a system and also reduces the pressure
on the VM subsystem for higher order allocations. This option
will also use IRQ stacks to compensate for the reduced stackspace.

到底有什么用？