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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/tools/rcu/rcu-updaters.sh
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#!/bin/sh

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# SPDX-License-Identifier: GPL-2.0+

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#

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# Run bpftrace to obtain a histogram of the types of primitives used to

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# initiate RCU grace periods.  The count associated with rcu_gp_init()

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# is the number of normal (non-expedited) grace periods.

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#

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# Usage: rcu-updaters.sh [ duration-in-seconds ]

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#

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# Note that not all kernel builds have all of these functions.  In those

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# that do not, this script will issue a diagnostic for each that is not

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# found, but continue normally for the rest of the functions.

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duration=${1}

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if test -n "${duration}"

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then

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	exitclause='interval:s:'"${duration}"' { exit(); }'

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else

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	echo 'Hit control-C to end sample and print results.'

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fi

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bpftrace -e 'kprobe:kvfree_call_rcu,

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	     kprobe:call_rcu,

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	     kprobe:call_rcu_tasks,

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	     kprobe:call_rcu_tasks_trace,

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	     kprobe:call_srcu,

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	     kprobe:rcu_barrier,

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	     kprobe:rcu_barrier_tasks,

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	     kprobe:rcu_barrier_tasks_trace,

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	     kprobe:srcu_barrier,

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	     kprobe:synchronize_rcu,

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	     kprobe:synchronize_rcu_expedited,

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	     kprobe:synchronize_rcu_tasks,

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	     kprobe:synchronize_rcu_tasks_rude,

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	     kprobe:synchronize_rcu_tasks_trace,

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	     kprobe:synchronize_srcu,

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	     kprobe:synchronize_srcu_expedited,

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	     kprobe:get_state_synchronize_rcu,

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	     kprobe:get_state_synchronize_rcu_full,

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	     kprobe:start_poll_synchronize_rcu,

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	     kprobe:start_poll_synchronize_rcu_expedited,

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	     kprobe:start_poll_synchronize_rcu_full,

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	     kprobe:start_poll_synchronize_rcu_expedited_full,

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	     kprobe:poll_state_synchronize_rcu,

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	     kprobe:poll_state_synchronize_rcu_full,

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	     kprobe:cond_synchronize_rcu,

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	     kprobe:cond_synchronize_rcu_full,

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	     kprobe:start_poll_synchronize_srcu,

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	     kprobe:poll_state_synchronize_srcu,

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	     kprobe:rcu_gp_init

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	     	{ @counts[func] = count(); } '"${exitclause}"

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