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authorChuck Lever <chuck.lever@oracle.com>2010-05-07 13:34:47 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2010-05-14 15:09:33 -0400
commitff8399709e41bf72b4cb145612a0f9a9f7283c83 (patch)
tree5577163d56e30020d907245f00dcef17730f037b /net/sunrpc/sched.c
parentf56916b97fe2031761ca611f0a342efd913afb33 (diff)
SUNRPC: Replace jiffies-based metrics with ktime-based metrics
Currently RPC performance metrics that tabulate elapsed time use jiffies time values. This is problematic on systems that use slow jiffies (for instance 100HZ systems built for paravirtualized environments). It is also a problem for computing precise latency statistics for advanced network transports, such as InfiniBand, that can have round-trip latencies significanly faster than a single clock tick. For the RPC client, adopt the high resolution time stamp mechanism already used by the network layer and blktrace: ktime. We use ktime format time stamps for all internal computations, and convert to milliseconds for presentation. As a result, we need only addition operations in the performance critical paths; multiply/divide is required only for presentation. We could report RTT metrics in microseconds. In fact the mountstats format is versioned to accomodate exactly this kind of interface improvement. For now, however, we'll stay with millisecond precision for presentation to maintain backwards compatibility with the handful of currently deployed user space tools. At a later point, we'll move to an API such as BDI_STATS where a finer timestamp precision can be reported. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc/sched.c')
-rw-r--r--net/sunrpc/sched.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c
index c8979ce5d88a..aa7b07ef5d55 100644
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -834,7 +834,7 @@ static void rpc_init_task(struct rpc_task *task, const struct rpc_task_setup *ta
834 } 834 }
835 835
836 /* starting timestamp */ 836 /* starting timestamp */
837 task->tk_start = jiffies; 837 task->tk_start = ktime_get();
838 838
839 dprintk("RPC: new task initialized, procpid %u\n", 839 dprintk("RPC: new task initialized, procpid %u\n",
840 task_pid_nr(current)); 840 task_pid_nr(current));