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