请教页面换出的问题

如下两个模块：
A.c
main()
{
……
}

B.c
int gVar = 0;
void func()
{
……
}

在main中先获得保护fVar的锁（ERESOURSE，IRQL提升到DPC），然后访问fVar偶尔会出现访问已换出页的错误。请问，变量gVar是分配在可换出页还是不可换出页里？
如果是在可换出页，这个问题应该如何解决？在NonPaged Pool中动态分配？还是使用其他的锁机制？
谢谢。

Don't quite understand your question. What you showed here is a typical user mode application, why you care about ERESOURCE and IRQL? Also ERESOURCE should be acquired at IRQL <= APC.

In kernel, MmProbeAndLockPages() can be called to make pageable memory resident and prevent it from paging out. Don't forget to call MmUnlockPages() after you done with it.