[systemd-devel] readahead-replay seems to not be doing anything.

Gary van der Merwe garyvdm at gmail.com
Mon Feb 11 02:34:43 PST 2013

Hi all.

This is my first post to this list, so I just want to say I thank you
too all those
who wrote systemd.

systemd-readahead-replay does not seem to be doing what it should.

Bootchart with readahead-[replay|collect] enabled:

Output of `/usr/lib/systemd/systemd-readahead analyze /.readahead` :

There is no output in `journalctl -u systemd-readahead-replay.service`

Bootchart with readahead-[replay|collect] disabled:

Note that both my root & home partitions are btrfs with

If you compare the bootcharts, you see that there is very little io reads when
systemd-readahead-replay starts. (Do systemd-readahead-replay reads not show in
bootcharts by design?)

Am I correct in thinking that systemd-readahead-replay is not doing what it

How can I debug why it is not working?



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