From: "Joel Fernandes (Google)" <[email protected]>
This is the next revision of preempt/irq tracepoint centralization and
unified usage across the kernel.
The preempt/irq tracepoints exist but not everything in the kernel is
using it. This makes things not work simultaneously (for ex, only either
lockdep or irqsoff events can be used at a time). This series is an attempt to
solve that, and also results in a nice clean up of kernel in general.
Several ifdefs are simpler, and the design is more unified and better.
Also as a result of this, we also speeded performance all rcuidle
tracepoints since their handling is simpler.
No major changes since v5. Just some spelling errors, small refactoring
etc. Also I removed the softirq bug fix from this series and submitted it
separately.
I am also writing a tracepoint self-test that runs various tests, along
with some documentation. I am planning to submit that separately since
it'll take some time to complete them and so that these can go in first.
See [1] for a preview of the tests I have so far (its early stage).
v6:
- fixed lockdep_recursion undefined issue, now using
lockdep_recursing().
- minor patch clean up
v5:
- Fixed performance issues due to rcu-idle handling
Joel Fernandes (Google) (4):
srcu: Add notrace variant of srcu_dereference
trace/irqsoff: Split reset into separate functions
tracepoint: Make rcuidle tracepoint callers use SRCU
tracing: Centralize preemptirq tracepoints and unify their usage
Paul McKenney (1):
srcu: Add notrace variants of srcu_read_{lock,unlock}
include/linux/ftrace.h | 11 +-
include/linux/irqflags.h | 11 +-
include/linux/lockdep.h | 8 +-
include/linux/preempt.h | 2 +-
include/linux/srcu.h | 22 +++
include/linux/tracepoint.h | 46 +++++-
include/trace/events/preemptirq.h | 23 +--
init/main.c | 5 +-
kernel/locking/lockdep.c | 35 ++---
kernel/sched/core.c | 2 +-
kernel/trace/Kconfig | 22 ++-
kernel/trace/Makefile | 2 +-
kernel/trace/trace_irqsoff.c | 235 +++++++++---------------------
kernel/trace/trace_preemptirq.c | 71 +++++++++
kernel/tracepoint.c | 15 +-
15 files changed, 282 insertions(+), 228 deletions(-)
create mode 100644 kernel/trace/trace_preemptirq.c
[1] tracepoint-selftests: https://tinyurl.com/tptests-1
Cc: Steven Rostedt <[email protected]>
Cc: Peter Zilstra <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: Tom Zanussi <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Thomas Glexiner <[email protected]>
Cc: Boqun Feng <[email protected]>
Cc: Paul McKenney <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Randy Dunlap <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Fenguang Wu <[email protected]>
Cc: Baohong Liu <[email protected]>
Cc: Vedang Patel <[email protected]>
Cc: [email protected]
Signed-off-by: Joel Fernandes (Google) <[email protected]>
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2.17.0.441.gb46fe60e1d-goog
