1#!/bin/sh
 2# SPDX-License-Identifier: GPL-2.0+
 3#
 4# Run bpftrace to obtain a histogram of the types of primitives used to
 5# initiate RCU grace periods.  The count associated with rcu_gp_init()
 6# is the number of normal (non-expedited) grace periods.
 7#
 8# Usage: rcu-updaters.sh [ duration-in-seconds ]
 9#
10# Note that not all kernel builds have all of these functions.  In those
11# that do not, this script will issue a diagnostic for each that is not
12# found, but continue normally for the rest of the functions.
13
14duration=${1}
15if test -n "${duration}"
16then
17	exitclause='interval:s:'"${duration}"' { exit(); }'
18else
19	echo 'Hit control-C to end sample and print results.'
20fi
21bpftrace -e 'kprobe:kvfree_call_rcu,
22	     kprobe:call_rcu,
23	     kprobe:call_rcu_tasks,
24	     kprobe:call_rcu_tasks_trace,
25	     kprobe:call_srcu,
26	     kprobe:rcu_barrier,
27	     kprobe:rcu_barrier_tasks,
28	     kprobe:rcu_barrier_tasks_trace,
29	     kprobe:srcu_barrier,
30	     kprobe:synchronize_rcu,
31	     kprobe:synchronize_rcu_expedited,
32	     kprobe:synchronize_rcu_tasks,
33	     kprobe:synchronize_rcu_tasks_rude,
34	     kprobe:synchronize_rcu_tasks_trace,
35	     kprobe:synchronize_srcu,
36	     kprobe:synchronize_srcu_expedited,
37	     kprobe:get_state_synchronize_rcu,
38	     kprobe:get_state_synchronize_rcu_full,
39	     kprobe:start_poll_synchronize_rcu,
40	     kprobe:start_poll_synchronize_rcu_expedited,
41	     kprobe:start_poll_synchronize_rcu_full,
42	     kprobe:start_poll_synchronize_rcu_expedited_full,
43	     kprobe:poll_state_synchronize_rcu,
44	     kprobe:poll_state_synchronize_rcu_full,
45	     kprobe:cond_synchronize_rcu,
46	     kprobe:cond_synchronize_rcu_full,
47	     kprobe:start_poll_synchronize_srcu,
48	     kprobe:poll_state_synchronize_srcu,
49	     kprobe:rcu_gp_init
50	     	{ @counts[func] = count(); } '"${exitclause}"