On Tue, 04 Dec 2012 18:17:08 -0600
Matt Mackall [off-list ref] wrote:

On Tue, 2012-12-04 at 15:21 -0800, Andrew Morton wrote:

quoted

On Tue, 04 Dec 2012 09:15:10 +0400
Pavel Emelyanov [off-list ref] wrote:

quoted

quoted

Two alternatives come to mind:

1)  Use /proc/pid/pagemap (Documentation/vm/pagemap.txt) in some
    fashion to determine which pages have been touched.

[momentarily coming out of kernel retirement for old man rant]

This is a popular interface anti-pattern.

You shouldn't use an interface that gives you huge amount of STATE to
detect small amounts of CHANGE via manual differentiation.

I'm not sure that's what checkpoint-restart will be doing.  If we want
to determine "which pages have been touched since the last checkpoint
ten minutes ago" then that set of touched pages *is* state.  And it's
not "small"!


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