tools/rcu/rcu-updaters.sh

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