mirror of
https://github.com/torvalds/linux
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0ac55d095d
This commit adds a tools/rcu/rcu-updaters.sh script that uses bpftrace to print a histogram of the RCU update-side primitives invoked during the specified time interval, or until manually terminated if no interval is specified. Sample output on an idle laptop: @counts[poll_state_synchronize_rcu]: 6 @counts[synchronize_srcu]: 13 @counts[call_rcu_tasks_trace]: 25 @counts[synchronize_rcu]: 54 @counts[kvfree_call_rcu]: 428 @counts[call_rcu]: 2134 Note that when run on a kernel missing one or more of the symbols, this script will issue a diagnostic for each that is not found, but continue normally for the rest of the functions. Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
53 lines
1.8 KiB
Bash
Executable file
53 lines
1.8 KiB
Bash
Executable file
#!/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_rude,
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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_rude,
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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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