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
14 duration=${1}
15 if test -n "${duration}"
16 then
17 exitclause='interval:s:'"${duration}"' { exit(); }'
18 else
19 echo 'Hit control-C to end sample and print results.'
20 fi
21 bpftrace -e 'kprobe:kvfree_call_rcu,
22 kprobe:call_rcu,
23 kprobe:call_rcu_tasks,
24 kprobe:call_rcu_tasks_rude,
25 kprobe:call_rcu_tasks_trace,
26 kprobe:call_srcu,
27 kprobe:rcu_barrier,
28 kprobe:rcu_barrier_tasks,
29 kprobe:rcu_barrier_tasks_rude,
30 kprobe:rcu_barrier_tasks_trace,
31 kprobe:srcu_barrier,
32 kprobe:synchronize_rcu,
33 kprobe:synchronize_rcu_expedited,
34 kprobe:synchronize_rcu_tasks,
35 kprobe:synchronize_rcu_tasks_rude,
36 kprobe:synchronize_rcu_tasks_trace,
37 kprobe:synchronize_srcu,
38 kprobe:synchronize_srcu_expedited,
39 kprobe:get_state_synchronize_rcu,
40 kprobe:get_state_synchronize_rcu_full,
41 kprobe:start_poll_synchronize_rcu,
42 kprobe:start_poll_synchronize_rcu_expedited,
43 kprobe:start_poll_synchronize_rcu_full,
44 kprobe:start_poll_synchronize_rcu_expedited_full,
45 kprobe:poll_state_synchronize_rcu,
46 kprobe:poll_state_synchronize_rcu_full,
47 kprobe:cond_synchronize_rcu,
48 kprobe:cond_synchronize_rcu_full,
49 kprobe:start_poll_synchronize_srcu,
50 kprobe:poll_state_synchronize_srcu,
51 kprobe:rcu_gp_init
52 { @counts[func] = count(); } '"${exitclause}"
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