Jens, there are some write-only fields in cfq_data and cfq_queue to be
added in 2.6.22. I'm attaching patch to show what can be deleted, but
something suspicious is going on:
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index baef5fc..eed7020 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -109,9 +109,6 @@ struct cfq_data {
unsigned int cfq_slice_idle;
struct list_head cic_list;
-
- sector_t new_seek_mean;
- u64 new_seek_total;
};
/*
@@ -151,8 +148,6 @@ struct cfq_queue {
/* various state flags, see below */
unsigned int flags;
-
- sector_t last_request_pos;
};
enum cfqq_state_flags {
@@ -1570,11 +1565,6 @@ cfq_update_io_seektime(struct cfq_data *cfqd, struct
cfq_io_context *cic,
else
sdist = cic->last_request_pos - rq->sector;
- if (!cic->seek_samples) {
- cfqd->new_seek_total = (7*cic->seek_total + (u64)256*sdist) / 8;
- cfqd->new_seek_mean = cfqd->new_seek_total / 256;
- }
-
/*
* Don't allow the seek distance to get too large from the
* odd fragment, pagein, etc
@@ -1710,7 +1700,6 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue
*cfqq,
cfq_update_idle_window(cfqd, cfqq, cic);
cic->last_request_pos = rq->sector + rq->nr_sectors;
- cfqq->last_request_pos = cic->last_request_pos;
if (cfqq == cfqd->active_queue) {
/*
-
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