[CRIU] Memory dump time with incremental checkpoint

[Ranjan Sarpangala Venkatesh]

Hi,

Following are the statistics collected while creating incremental dumps of
an application using

criu dump --tree $PID --images-dir ./checkpoints/$i/ --leave-running -vvv
-o dump.log

Dump 1, "pages_written": 2832, "memwrite_time": 11743,
Dump 2,  "pages_written": 2034, "memwrite_time": 45700,

Dump 2 takes much longer while writing less number of pages. Is this due to
behavior of splice(). Custom kernel version based on 4.10.0. Any insights
would be helpful. Thanks

$crit show 1/stats-dump
{
    "magic": "STATS",
    "entries": [
        {
            "dump": {
                "freezing_time": 273,
                "frozen_time": 24271,
                "memdump_time": 14884,
                "memwrite_time": 11743,
                "pages_scanned": 9566,
                "pages_skipped_parent": 0,
                "pages_written": 2832,
                "irmap_resolve": 0
            }
        }
    ]
}

$crit show 2/stats-dump
{
    "magic": "STATS",
    "entries": [
        {
            "dump": {
                "freezing_time": 122,
                "frozen_time": 55545,
                "memdump_time": 49705,
                "memwrite_time": 45700,
                "pages_scanned": 5873,
                "pages_skipped_parent": 0,
                "pages_written": 2034,
                "irmap_resolve": 0
            }
        }
    ]
}

Regards
Ranjan
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