Changes

In order to find out what pages in memory has changed, we [http://lwn.net/Articles/546966/ patched] the kernel. Tracking the memory changes consists of two steps:

In order to find out what pages in memory has changed, we [http://lwn.net/Articles/546966/ patched] the kernel. Tracking the memory changes consists of two steps:

* Tell the kernel that we want it to keep track of memory changes by particular task by writing 4 into <core>/proc/$pid/clear_refs</code> file.

* Tell the kernel that we want it to keep track of memory changes by particular task by writing 4 into <code>/proc/$pid/clear_refs</code> file.

and after a while

and after a while