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staging/rdma/hfi1: Change send_schedule counter to a per cpu counter

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A patch to fix fairness issues in QP scheduling requires
n_send_schedule counter to be converted to a per cpu counter to reduce
cache misses.

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Vennila Megavannan <vennila.megavannan@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Vennila Megavannan 2016-02-03 14:34:07 -08:00 committed by Doug Ledford
parent 377f111ee8
commit 89abfc8d64
5 changed files with 15 additions and 4 deletions
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3
drivers/staging/rdma/hfi1/chip.c
View File

@ -1609,7 +1609,8 @@ static u64 access_sw_send_schedule(const struct cntr_entry *entry,
{
struct hfi1_devdata *dd = (struct hfi1_devdata *)context;
return dd->verbs_dev.n_send_schedule;
return read_write_cpu(dd, &dd->z_send_schedule, dd->send_schedule, vl,
mode, data);
}
/* Software counters for the error status bits within MISC_ERR_STATUS */

4
drivers/staging/rdma/hfi1/hfi.h
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@ -898,10 +898,11 @@ struct hfi1_devdata {
/* reset value */
u64 z_int_counter;
u64 z_rcv_limit;
u64 z_send_schedule;
/* percpu int_counter */
u64 __percpu *int_counter;
u64 __percpu *rcv_limit;
u64 __percpu *send_schedule;
/* number of receive contexts in use by the driver */
u32 num_rcv_contexts;
/* number of pio send contexts in use by the driver */
@ -1884,6 +1885,7 @@ static inline void hfi1_reset_cpu_counters(struct hfi1_devdata *dd)
dd->z_int_counter = get_all_cpu_total(dd->int_counter);
dd->z_rcv_limit = get_all_cpu_total(dd->rcv_limit);
dd->z_send_schedule = get_all_cpu_total(dd->send_schedule);
ppd = (struct hfi1_pportdata *)(dd + 1);
for (i = 0; i < dd->num_pports; i++, ppd++) {

9
drivers/staging/rdma/hfi1/init.c
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@ -985,6 +985,7 @@ void hfi1_free_devdata(struct hfi1_devdata *dd)
free_percpu(dd->int_counter);
free_percpu(dd->rcv_limit);
hfi1_dev_affinity_free(dd);
free_percpu(dd->send_schedule);
ib_dealloc_device(&dd->verbs_dev.rdi.ibdev);
}
@ -1063,6 +1064,14 @@ struct hfi1_devdata *hfi1_alloc_devdata(struct pci_dev *pdev, size_t extra)
goto bail;
}
dd->send_schedule = alloc_percpu(u64);
if (!dd->send_schedule) {
ret = -ENOMEM;
hfi1_early_err(&pdev->dev,
"Could not allocate per-cpu int_counter\n");
goto bail;
}
if (!hfi1_cpulist_count) {
u32 count = num_online_cpus();

2
drivers/staging/rdma/hfi1/ruc.c
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@ -875,7 +875,7 @@ void hfi1_do_send(struct rvt_qp *qp)
/* allow other tasks to run */
if (unlikely(time_after(jiffies, timeout))) {
cond_resched();
ps.ppd->dd->verbs_dev.n_send_schedule++;
this_cpu_inc(*ps.ppd->dd->send_schedule);
timeout = jiffies + SEND_RESCHED_TIMEOUT;
}
} while (make_req(qp));

1
drivers/staging/rdma/hfi1/verbs.h
View File

@ -270,7 +270,6 @@ struct hfi1_ibdev {
u64 n_piowait;
u64 n_txwait;
u64 n_kmem_wait;
u64 n_send_schedule;
#ifdef CONFIG_DEBUG_FS
/* per HFI debugfs */