On 10-Sep-2014 6:24 pm, <[email protected]> wrote: > > On Wed, 10 Sep 2014 14:45:23 +0530, Manavendra Nath Manav said: > > > But if the total RAM is limited (less than 896MB LOWMEM), for example as in > > embedded devices how the kernel code be kept in RAM all the time. Am I > > correct to assume that the kernel pre-fetches all pages when entering > > kernel mode from user mode? > > No, kernel code is loaded by your boot loader, and *it stays there*. Similarly, > if you modprobe something, the kernel allocates the page, loads the code, > and leaves it there. > > Particularly in embedded devices, where you know all the modules the kernel may > need, it's common to just create a kernel with everything built in, no module > support, and when the system boots, it loads into memory and never moves again. >
Linux kernel memory is not page-able, but memory allocated through vmalloc can still cause page fault. How device drivers using vmalloc handle this?
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