[PATCH btt] Add in pre-culling of traces until we get our first Q operation on a device.

[Alan D. Brunelle]

From: Alan D. Brunelle <[EMAIL PROTECTED]>

Add in the notion of pre-culling IOs per device until a Q is hit.

Signed-off-by: Alan D. Brunelle <[EMAIL PROTECTED]>
---

 btt/devs.c    |    8 ++++++++
 btt/globals.h |    1 +
 2 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/btt/devs.c b/btt/devs.c
index f2b09d2..a458a77 100644
--- a/btt/devs.c
+++ b/btt/devs.c
@@ -112,9 +112,17 @@ struct d_info *dip_add(__u32 device, struct io *iop)
                list_add_tail(&dip->hash_head, &dev_heads[DEV_HASH(device)]);
                list_add_tail(&dip->all_head, &all_devs);
                dip->start_time = BIT_TIME(iop->t.time);
+               dip->pre_culling = 1;
                n_devs++;
        }
 
+       if (dip->pre_culling) {
+               if (iop->type == IOP_Q || iop->type == IOP_A)
+                       dip->pre_culling = 0;
+               else
+                       return NULL;
+       }
+
        iop->linked = dip_rb_ins(dip, iop);
 #if defined(DEBUG)
        if (iop->linked) 
diff --git a/btt/globals.h b/btt/globals.h
index aebd0d8..cdf6fc9 100644
--- a/btt/globals.h
+++ b/btt/globals.h
@@ -166,6 +166,7 @@ struct d_info {
        __u64 last_q, n_ds;
        __u32 device;
 
+       int pre_culling;
        int is_plugged, nplugs, n_timer_unplugs;
        double start_time, last_plug, plugged_time, end_time;
 };