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By default, even private writable pages are mapped
with the RW bit disabled in the PTE. This causes a
"minor" page fault when the page is first written
to. To avoid this, make sure that vm_inert_page()
uses the proper page protection bits and mark the
VMA as VM_IO to keep the rest of the VM code out.
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Page faults should not happen here. Scream if they do anyway. This is
useful when extending the control page.
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vm_insert_page() is the simpler and preferred interface for remapping
individual pages and includes additional error checks. It suffices for
our purposes, so let's use it instead.
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This patch changes sched_trace.c to use the miscdevice API
instead of doing all the cdev management ourselves. This remove a
chunk of code and we get sysfs / udev integration for free.
On systems with default udev rules, this will result in a /dev/litmus/log
device being created automatically.
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This device only supports mmap()'ing a single page.
This page is shared RW between the kernel and userspace.
It is inteded to allow near-zero-overhead communication
between the kernel and userspace. It's first use will be a
proper implementation of user-signaled
non-preemptable section support.
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