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IB/hfi1: Add packet histogram trace event 

Add a simple trace event taking context number and building simple
histogram to print packets distribution between contexts.

Link: https://lore.kernel.org/r/20200511160700.173205.84270.stgit@awfm-01.aw.intel.com
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com>
Signed-off-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Grzegorz Andrejczuk 2020-05-11 12:07:01 -04:00 committed by Jason Gunthorpe
parent b7e159eb00
commit 7638c0e965
3 changed files with 43 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/infiniband/hw/hfi1/driver.c
View File

@ -1706,6 +1706,7 @@ static void hfi1_ipoib_ib_rcv(struct hfi1_packet *packet)
goto drop_no_nd;
trace_input_ibhdr(rcd->dd, packet, !!(rhf_dc_info(packet->rhf)));
trace_ctxt_rsm_hist(rcd->ctxt);
/* handle congestion notifications */
do_work = hfi1_may_ecn(packet);

32
drivers/infiniband/hw/hfi1/trace.c
View File

@ -520,6 +520,38 @@ u16 hfi1_trace_get_tid_idx(u32 ent)
return EXP_TID_GET(ent, IDX);
}
struct hfi1_ctxt_hist {
atomic_t count;
atomic_t data[255];
};
struct hfi1_ctxt_hist hist = {
.count = ATOMIC_INIT(0)
};
const char *hfi1_trace_print_rsm_hist(struct trace_seq *p, unsigned int ctxt)
{
int i, len = ARRAY_SIZE(hist.data);
const char *ret = trace_seq_buffer_ptr(p);
unsigned long packet_count = atomic_fetch_inc(&hist.count);
trace_seq_printf(p, "packet[%lu]", packet_count);
for (i = 0; i < len; ++i) {
unsigned long val;
atomic_t *count = &hist.data[i];
if (ctxt == i)
val = atomic_fetch_inc(count);
else
val = atomic_read(count);
if (val)
trace_seq_printf(p, "(%d:%lu)", i, val);
}
trace_seq_putc(p, 0);
return ret;
}
__hfi1_trace_fn(AFFINITY);
__hfi1_trace_fn(PKT);
__hfi1_trace_fn(PROC);

11
drivers/infiniband/hw/hfi1/trace_ctxts.h
View File

@ -1,5 +1,5 @@
/*
* Copyright(c) 2015, 2016 Intel Corporation.
* Copyright(c) 2015 - 2020 Intel Corporation.
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
@ -138,6 +138,15 @@ TRACE_EVENT(hfi1_ctxt_info,
)
);
const char *hfi1_trace_print_rsm_hist(struct trace_seq *p, unsigned int ctxt);
TRACE_EVENT(ctxt_rsm_hist,
TP_PROTO(unsigned int ctxt),
TP_ARGS(ctxt),
TP_STRUCT__entry(__field(unsigned int, ctxt)),
TP_fast_assign(__entry->ctxt = ctxt;),
TP_printk("%s", hfi1_trace_print_rsm_hist(p, __entry->ctxt))
);
#endif /* __HFI1_TRACE_CTXTS_H */
#undef TRACE_INCLUDE_PATH