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sunrpc: Add static trace point to report RPC latency stats

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Introduce a low-overhead mechanism to report information about
latencies of individual RPCs. The goal is to enable user space to
filter the trace record for latency outliers, or build histograms,
etc.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2018-03-16 10:33:49 -04:00 committed by Anna Schumaker
parent e671edb942
commit 40bf7eb304
2 changed files with 56 additions and 5 deletions
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45
include/trace/events/sunrpc.h
View File

@ -212,6 +212,51 @@ DEFINE_EVENT(rpc_task_queued, rpc_task_wakeup,
);
TRACE_EVENT(rpc_stats_latency,
TP_PROTO(
const struct rpc_task *task,
ktime_t backlog,
ktime_t rtt,
ktime_t execute
),
TP_ARGS(task, backlog, rtt, execute),
TP_STRUCT__entry(
__field(u32, xid)
__field(int, version)
__string(progname, task->tk_client->cl_program->name)
__string(procname, rpc_proc_name(task))
__field(unsigned long, backlog)
__field(unsigned long, rtt)
__field(unsigned long, execute)
__string(addr,
task->tk_xprt->address_strings[RPC_DISPLAY_ADDR])
__string(port,
task->tk_xprt->address_strings[RPC_DISPLAY_PORT])
),
TP_fast_assign(
__entry->xid = be32_to_cpu(task->tk_rqstp->rq_xid);
__entry->version = task->tk_client->cl_vers;
__assign_str(progname, task->tk_client->cl_program->name)
__assign_str(procname, rpc_proc_name(task))
__entry->backlog = ktime_to_us(backlog);
__entry->rtt = ktime_to_us(rtt);
__entry->execute = ktime_to_us(execute);
__assign_str(addr,
task->tk_xprt->address_strings[RPC_DISPLAY_ADDR]);
__assign_str(port,
task->tk_xprt->address_strings[RPC_DISPLAY_PORT]);
),
TP_printk("peer=[%s]:%s xid=0x%08x %sv%d %s backlog=%lu rtt=%lu execute=%lu",
__get_str(addr), __get_str(port), __entry->xid,
__get_str(progname), __entry->version, __get_str(procname),
__entry->backlog, __entry->rtt, __entry->execute)
);
/*
* First define the enums in the below macros to be exported to userspace
* via TRACE_DEFINE_ENUM().

16
net/sunrpc/stats.c
View File

@ -24,6 +24,8 @@
#include <linux/sunrpc/metrics.h>
#include <linux/rcupdate.h>
#include <trace/events/sunrpc.h>
#include "netns.h"
#define RPCDBG_FACILITY RPCDBG_MISC
@ -148,7 +150,7 @@ void rpc_count_iostats_metrics(const struct rpc_task *task,
struct rpc_iostats *op_metrics)
{
struct rpc_rqst *req = task->tk_rqstp;
ktime_t delta, now;
ktime_t backlog, execute, now;
if (!op_metrics || !req)
return;
@ -164,16 +166,20 @@ void rpc_count_iostats_metrics(const struct rpc_task *task,
op_metrics->om_bytes_sent += req->rq_xmit_bytes_sent;
op_metrics->om_bytes_recv += req->rq_reply_bytes_recvd;
backlog = 0;
if (ktime_to_ns(req->rq_xtime)) {
delta = ktime_sub(req->rq_xtime, task->tk_start);
op_metrics->om_queue = ktime_add(op_metrics->om_queue, delta);
backlog = ktime_sub(req->rq_xtime, task->tk_start);
op_metrics->om_queue = ktime_add(op_metrics->om_queue, backlog);
}
op_metrics->om_rtt = ktime_add(op_metrics->om_rtt, req->rq_rtt);
delta = ktime_sub(now, task->tk_start);
op_metrics->om_execute = ktime_add(op_metrics->om_execute, delta);
execute = ktime_sub(now, task->tk_start);
op_metrics->om_execute = ktime_add(op_metrics->om_execute, execute);
spin_unlock(&op_metrics->om_lock);
trace_rpc_stats_latency(req->rq_task, backlog, req->rq_rtt, execute);
}
EXPORT_SYMBOL_GPL(rpc_count_iostats_metrics);