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IB/{rdmavt,hfi1}: Change hrtimer add to use pinned version 

Given we are dealing with nano-second level timers, when the timer
pops, ensure it happens on the CPU which caused the timer to be set
in the first place.  This avoids excessive jitter from the desired
expiration time by avoiding the cost of switching our context to
another CPU that is cache cold for this given timer.

Reviewed-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Mike Marciniszyn 2018-05-15 18:31:24 -07:00 committed by Jason Gunthorpe
parent 5938d94cf0
commit 3ce459cd68
2 changed files with 2 additions and 2 deletions
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2
drivers/infiniband/hw/hfi1/rc.c
View File

@ -2012,7 +2012,7 @@ void process_becn(struct hfi1_pportdata *ppd, u8 sl, u32 rlid, u32 lqpn,
unsigned long nsec = 1024 * ccti_timer;
hrtimer_start(&cca_timer->hrtimer, ns_to_ktime(nsec),
HRTIMER_MODE_REL);
HRTIMER_MODE_REL_PINNED);
}
spin_unlock_irqrestore(&ppd->cca_timer_lock, flags);

2
drivers/infiniband/sw/rdmavt/qp.c
View File

@ -2225,7 +2225,7 @@ void rvt_add_rnr_timer(struct rvt_qp *qp, u32 aeth)
to = rvt_aeth_to_usec(aeth);
trace_rvt_rnrnak_add(qp, to);
hrtimer_start(&qp->s_rnr_timer,
ns_to_ktime(1000 * to), HRTIMER_MODE_REL);
ns_to_ktime(1000 * to), HRTIMER_MODE_REL_PINNED);
}
EXPORT_SYMBOL(rvt_add_rnr_timer);