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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2021-07-04 12:58:33 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-07-04 12:58:33 -0700 |
| commit | 28e92f990337b8b4c5fdec47667f8b96089c503e (patch) | |
| tree | 0dc55280883e7262d831ad24deb3a4fd2a56031a /tools/rcu/rcu-cbs.py | |
| parent | da803f82faa5ceeff34aa56c08ceba5384e44e47 (diff) | |
| parent | 641faf1b9064c270a476a424e60063bb05df3ee9 (diff) | |
| download | lwn-28e92f990337b8b4c5fdec47667f8b96089c503e.tar.gz lwn-28e92f990337b8b4c5fdec47667f8b96089c503e.zip | |
Merge branch 'core-rcu-2021.07.04' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu
Pull RCU updates from Paul McKenney:
- Bitmap parsing support for "all" as an alias for all bits
- Documentation updates
- Miscellaneous fixes, including some that overlap into mm and lockdep
- kvfree_rcu() updates
- mem_dump_obj() updates, with acks from one of the slab-allocator
maintainers
- RCU NOCB CPU updates, including limited deoffloading
- SRCU updates
- Tasks-RCU updates
- Torture-test updates
* 'core-rcu-2021.07.04' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu: (78 commits)
tasks-rcu: Make show_rcu_tasks_gp_kthreads() be static inline
rcu-tasks: Make ksoftirqd provide RCU Tasks quiescent states
rcu: Add missing __releases() annotation
rcu: Remove obsolete rcu_read_unlock() deadlock commentary
rcu: Improve comments describing RCU read-side critical sections
rcu: Create an unrcu_pointer() to remove __rcu from a pointer
srcu: Early test SRCU polling start
rcu: Fix various typos in comments
rcu/nocb: Unify timers
rcu/nocb: Prepare for fine-grained deferred wakeup
rcu/nocb: Only cancel nocb timer if not polling
rcu/nocb: Delete bypass_timer upon nocb_gp wakeup
rcu/nocb: Cancel nocb_timer upon nocb_gp wakeup
rcu/nocb: Allow de-offloading rdp leader
rcu/nocb: Directly call __wake_nocb_gp() from bypass timer
rcu: Don't penalize priority boosting when there is nothing to boost
rcu: Point to documentation of ordering guarantees
rcu: Make rcu_gp_cleanup() be noinline for tracing
rcu: Restrict RCU_STRICT_GRACE_PERIOD to at most four CPUs
rcu: Make show_rcu_gp_kthreads() dump rcu_node structures blocking GP
...
Diffstat (limited to 'tools/rcu/rcu-cbs.py')
| -rw-r--r-- | tools/rcu/rcu-cbs.py | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/tools/rcu/rcu-cbs.py b/tools/rcu/rcu-cbs.py new file mode 100644 index 000000000000..f8b461b9eaa7 --- /dev/null +++ b/tools/rcu/rcu-cbs.py @@ -0,0 +1,46 @@ +#!/usr/bin/env drgn +# SPDX-License-Identifier: GPL-2.0+ +# +# Dump out the number of RCU callbacks outstanding. +# +# On older kernels having multiple flavors of RCU, this dumps out the +# number of callbacks for the most heavily used flavor. +# +# Usage: sudo drgn rcu-cbs.py +# +# Copyright (C) 2021 Facebook, Inc. +# +# Authors: Paul E. McKenney <paulmck@kernel.org> + +import sys +import drgn +from drgn import NULL, Object +from drgn.helpers.linux import * + +def get_rdp0(prog): + try: + rdp0 = prog.variable('rcu_preempt_data', 'kernel/rcu/tree.c'); + except LookupError: + rdp0 = NULL; + + if rdp0 == NULL: + try: + rdp0 = prog.variable('rcu_sched_data', + 'kernel/rcu/tree.c'); + except LookupError: + rdp0 = NULL; + + if rdp0 == NULL: + rdp0 = prog.variable('rcu_data', 'kernel/rcu/tree.c'); + return rdp0.address_of_(); + +rdp0 = get_rdp0(prog); + +# Sum up RCU callbacks. +sum = 0; +for cpu in for_each_possible_cpu(prog): + rdp = per_cpu_ptr(rdp0, cpu); + len = rdp.cblist.len.value_(); + # print("CPU " + str(cpu) + " RCU callbacks: " + str(len)); + sum += len; +print("Number of RCU callbacks in flight: " + str(sum)); |