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3afe7fa535
linux/kernel/rcu
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Joel Fernandes (Google) 3afe7fa535 rcu/trace: Add tracing for how segcb list changes 
This commit adds tracing to track how the segcb list changes before/after
acceleration, during queuing and during dequeuing.

This tracing helped discover an optimization that avoided needless GP
requests when no callbacks were accelerated. The tracing overhead is
minimal as each segment's length is now stored in the respective segment.

Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Reviewed-by: Neeraj Upadhyay <neeraju@codeaurora.org>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
2021-01-06 16:24:19 -08:00
..
Kconfig rcu: Clarify nocb kthreads naming in RCU_NOCB_CPU config 2020-11-19 19:37:16 -08:00
Kconfig.debug Merge branch 'strictgp.2020.08.24a' into HEAD 2020-09-03 09:47:42 -07:00
Makefile rcuperf: Change rcuperf to rcuscale 2020-08-24 18:39:24 -07:00
rcu_segcblist.c rcu/tree: segcblist: Remove redundant smp_mb()s 2021-01-06 16:24:19 -08:00
rcu_segcblist.h rcu/segcblist: Add counters to segcblist datastructure 2021-01-06 16:24:19 -08:00
rcu.h rcutorture: Make grace-period kthread report match RCU flavor being tested 2020-11-02 17:12:43 -08:00
rcuscale.c rcuscale: Prevent hangs for invalid arguments 2020-11-06 17:13:51 -08:00
rcutorture.c Merge branches 'cpuinfo.2020.11.06a', 'doc.2020.11.06a', 'fixes.2020.11.19b', 'lockdep.2020.11.02a', 'tasks.2020.11.06a' and 'torture.2020.11.06a' into HEAD 2020-11-19 19:37:47 -08:00
refscale.c refscale: Prevent hangs for invalid arguments 2020-11-06 17:13:51 -08:00
srcutiny.c rcu: Use CONFIG_PREEMPTION where appropriate 2019-12-09 12:37:51 -08:00
srcutree.c rcu/segcblist: Add counters to segcblist datastructure 2021-01-06 16:24:19 -08:00
sync.c rcu/sync: Simplify the state machine 2019-05-28 09:05:23 -07:00
tasks.h rcu-tasks: Make the units of ->init_fract be jiffies 2020-11-06 17:17:59 -08:00
tiny.c rcu: Rename *_kfree_callback/*_kfree_rcu_offset/kfree_call_* 2020-06-29 11:59:25 -07:00
tree_exp.h rcu: Initialize at declaration time in rcu_exp_handler() 2020-08-24 18:36:03 -07:00
tree_plugin.h rcu: Do not report strict GPs for outgoing CPUs 2020-11-19 19:37:17 -08:00
tree_stall.h rcu: Panic after fixed number of stalls 2020-11-19 19:37:16 -08:00
tree.c rcu/trace: Add tracing for how segcb list changes 2021-01-06 16:24:19 -08:00
tree.h rcu: Prevent lockdep-RCU splats on lock acquisition/release 2020-11-19 19:37:17 -08:00
update.c Merge tag 'core-rcu-2020-10-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2020-10-18 14:34:50 -07:00