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Date: Wed, 14 Jun 2017 04:54:04 +0200
From: Andrea Parri <parri.andrea@...il.com>
To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, mingo@...nel.org
Cc: priyalee.kushwaha@...el.com, drozdziak1@...il.com, arnd@...db.de,
ldr709@...il.com, tglx@...utronix.de, peterz@...radead.org,
josh@...htriplett.org, nico@...aro.org, kjlx@...pleofstupid.com,
vegard.nossum@...cle.com, torvalds@...ux-foundation.org,
dcb314@...mail.com, fengguang.wu@...el.com, fweisbec@...il.com,
riel@...hat.com, rostedt@...dmis.org, stern@...land.harvard.edu,
linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL rcu/next] RCU commits for 4.13
On Mon, Jun 12, 2017 at 02:37:55PM -0700, Paul E. McKenney wrote:
> Hello, Ingo,
>
> This pull request is unusual in being a single linear set of commits,
> as opposed to my usual topic branches. This is due to the many
> large-footprint changes, which means that reasonable topic branches
> result in large numbers of merge conflicts. In addition, some commits
> depend on other commits that should be on different topic branches.
> I will return to the topic-branch style next time.
>
> The largest feature of this series is shrinking and simplification,
> with the following diffstat summary:
>
> 79 files changed, 1496 insertions(+), 4211 deletions(-)
>
> In other words, this series represents a net reduction of more than 2700
> lines of code.
>
> These commits were posted to LKML:
>
> http://lkml.kernel.org/r/20170525215934.GA11578@linux.vnet.ibm.com
I did raise some issues (AFAICT, unresolved) concerning...
>
> Two of these commits (46/88 and 48/88) have been deferred, most likely
> to v4.14. All of the remaining commits have been subjected to the 0day
> Test Robot and -next testing, and are availiable in teh git repository at:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git for-mingo
>
> for you to fetch changes up to 6d48152eafde1f0d0a4a9e0584fa7d9ff4fbfdac:
>
> rcu: Remove RCU CPU stall warnings from Tiny RCU (2017-06-08 18:52:45 -0700)
>
> ----------------------------------------------------------------
> Arnd Bergmann (1):
> bcm47xx: Fix build regression
>
> Paul E. McKenney (83):
> rcutorture: Add lockdep to one of the SRCU scenarios
> rcutorture: Add three-level tree test for Tree SRCU
> rcutorture: Fix bug in reporting Kconfig mis-settings
> rcutorture: Add a scenario for Tiny SRCU
> rcutorture: Add a scenario for Classic SRCU
> rcu: Prevent rcu_barrier() from starting needless grace periods
> rcutorture: Correctly handle CONFIG_RCU_TORTURE_TEST_* options
> rcutorture: Update test scenarios based on new Kconfig dependencies
> srcu: Eliminate possibility of destructive counter overflow
> rcu: Complain if blocking in preemptible RCU read-side critical section
> rcuperf: Defer expedited/normal check to end of test
> rcuperf: Remove conflicting Kconfig options
> rcu: Remove obsolete reference to synchronize_kernel()
> rcuperf: Add ability to performance-test call_rcu() and friends
> rcuperf: Add a Kconfig-fragment file for Classic SRCU
> rcu: Make sync_rcu_preempt_exp_done() return bool
> checkpatch: Remove checks for expedited grace periods
> rcuperf: Add test for dynamically initialized srcu_struct
> doc/atomic_ops: Clarify smp_mb__{before,after}_atomic()
> atomics: Add header comment so spin_unlock_wait()
... this one: c.f.,
http://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1418503.html
Any hints about those?
Andrea
> rcuperf: Add the ability to test tiny RCU flavors
> srcu: Make Classic and Tree SRCU announce themselves at bootup
> rcutorture: Reduce CPUs dedicated to testing Classic SRCU
> srcu: Shrink Tiny SRCU a bit more
> rcuperf: Set more user-friendly defaults
> rcuperf: Add writer_holdoff boot parameter
> rcutorture: Add "git diff" output to testid.txt file
> srcu: Document auto-expediting requirement
> doc: Take tail recursion into account in RCU requirements
> rcu: Add preemptibility checks in rcu_sched_qs() and rcu_bh_qs()
> rcu: Print out rcupdate.c non-default boot-time settings
> rcu: Update rcu_bootup_announce_oddness()
> srcu: Make exp_holdoff module parameter be static
> srcu: Print non-default exp_holdoff values at boot time
> rcu: Add lockdep_assert_held() teeth to tree.c
> rcu: Add lockdep_assert_held() teeth to tree_plugin.h
> srcu: Make SRCU be once again optional
> srcu: Shrink Tiny SRCU a bit
> srcu: Add DEBUG_OBJECTS_RCU_HEAD functionality
> rcu: Make synchronize_rcu_mult() check for duplicates
> sched: Rely on synchronize_rcu_mult() de-duplication
> rcu: Use RCU_NOCB_WAKE rather than RCU_NOGP_WAKE
> rcu: Add memory barriers for NOCB leader wakeup
> rcu: Flag need for rcu_node_tree.h and rcu_segcblist.h visibility
> rcu: Move docbook comments out of rcupdate.h
> rcu: Move rcu_expedited and rcu_normal externs from rcupdate.h
> rcu: Move expediting-related access/control out of rcupdate.h
> rcu: Move torture-related definitions from rcupdate.h to rcu.h
> rcu: Remove UINT_CMP_GE() and UINT_CMP_LT()
> rcu: Move rcupdate.h to new empty-function style
> rcu: Eliminate the unused __rcu_is_watching() function
> rcu: Move the RCU_SCHEDULER_ definitions from rcupdate.h
> rcu: Remove linux/debugobjects.h from rcupdate.h
> rcu: Improve __call_rcu() debug-objects error message
> rcu: Move rcu_is_nocb_cpu() from rcupdate.h to rcu.h
> rcu: Move rcu_ftrace_dump() from rcupdate.h to rcu.h
> rcu: move rcupdate.h to the new true/false-function style
> rcu: Move torture-related functions out of rcutiny.h and rcutree.h
> rcu: Move rcu_request_urgent_qs_task() out of rcutiny.h and rcutree.h
> rcu: Move rcutiny.h to new empty/true/false-function style
> srcu: Prevent sdp->srcu_gp_seq_needed counter wrap
> srcu: Shrink srcu.h by moving docbook and private function
> srcu: Apply trivial callback lists to shrink Tiny SRCU
> lockdep: Use consistent printing primitives
> rcu: Refactor #includes from include/linux/rcupdate.h
> rcu: Convert rnp->lock wrappers to macros for SRCU use
> rcu: Move rnp->lock wrappers for SRCU use
> srcu: Use rnp->lock wrappers to replace explicit memory barriers
> rcu: Remove *_SLOW_* Kconfig options
> rcu: Remove the RCU_KTHREAD_PRIO Kconfig option
> rcu: Remove nohz_full full-system-idle state machine
> rcu: Remove #ifdef moving rcu_end_inkernel_boot from rcupdate.h
> rcu: Remove typecheck() from RCU locking wrapper functions
> rcu: Remove the now-obsolete PROVE_RCU_REPEATEDLY Kconfig option
> rcu: Remove SPARSE_RCU_POINTER Kconfig option
> srcu: Fix rcutorture-statistics typo
> srcu: Remove Classic SRCU
> rcu: Remove debugfs tracing
> rcu: Eliminate NOCBs CPU-state Kconfig options
> rcu: Move RCU non-debug Kconfig options to kernel/rcu
> rcu: Move RCU debug Kconfig options to kernel/rcu
> rcu: Remove event tracing from Tiny RCU
> rcu: Remove RCU CPU stall warnings from Tiny RCU
>
> Priyalee Kushwaha (1):
> srcu-cbmc: Use /usr/bin/awk instead of /bin/awk
>
> Stan Drozd (1):
> docs: Fix typo in Documentation/memory-barriers.txt
>
> Documentation/RCU/00-INDEX | 2 -
> .../RCU/Design/Requirements/Requirements.html | 34 +-
> Documentation/RCU/checklist.txt | 8 +-
> Documentation/RCU/trace.txt | 535 -----------------
> Documentation/admin-guide/kernel-parameters.txt | 41 +-
> Documentation/core-api/atomic_ops.rst | 5 +
> Documentation/dev-tools/sparse.rst | 6 -
> Documentation/kernel-per-CPU-kthreads.txt | 31 +-
> Documentation/memory-barriers.txt | 2 +-
> Documentation/timers/NO_HZ.txt | 29 +-
> include/linux/bcm47xx_nvram.h | 1 +
> include/linux/compiler.h | 4 -
> include/linux/rcu_node_tree.h | 4 +
> include/linux/rcu_segcblist.h | 4 +
> include/linux/rcupdate.h | 318 +---------
> include/linux/rcutiny.h | 167 +-----
> include/linux/rcutree.h | 21 +-
> include/linux/spinlock.h | 20 +
> include/linux/srcu.h | 25 +-
> include/linux/srcuclassic.h | 115 ----
> include/linux/srcutiny.h | 47 +-
> include/linux/srcutree.h | 13 +-
> include/trace/events/rcu.h | 1 +
> init/Kconfig | 349 +----------
> kernel/locking/lockdep.c | 176 +++---
> kernel/rcu/Kconfig | 242 ++++++++
> kernel/rcu/Kconfig.debug | 82 +++
> kernel/rcu/Makefile | 2 -
> kernel/rcu/rcu.h | 277 +++++++++
> kernel/rcu/rcuperf.c | 129 +++-
> kernel/rcu/rcutorture.c | 21 +-
> kernel/rcu/srcu.c | 661 ---------------------
> kernel/rcu/srcutiny.c | 86 +--
> kernel/rcu/srcutree.c | 187 ++++--
> kernel/rcu/tiny.c | 54 +-
> kernel/rcu/tiny_plugin.h | 123 ----
> kernel/rcu/tree.c | 195 +++---
> kernel/rcu/tree.h | 109 +---
> kernel/rcu/tree_exp.h | 2 +-
> kernel/rcu/tree_plugin.h | 573 +++---------------
> kernel/rcu/tree_trace.c | 494 ---------------
> kernel/rcu/update.c | 77 ++-
> kernel/sched/core.c | 8 +-
> kernel/time/Kconfig | 50 --
> lib/Kconfig.debug | 184 +-----
> lib/Makefile | 3 -
> scripts/checkpatch.pl | 17 -
> .../selftests/rcutorture/bin/configcheck.sh | 2 +-
> .../testing/selftests/rcutorture/bin/kvm-build.sh | 2 +-
> tools/testing/selftests/rcutorture/bin/kvm.sh | 5 +-
> .../selftests/rcutorture/configs/rcu/CFLIST | 2 +
> .../selftests/rcutorture/configs/rcu/SRCU-C.boot | 1 +
> .../selftests/rcutorture/configs/rcu/SRCU-N | 2 +-
> .../selftests/rcutorture/configs/rcu/SRCU-P | 6 +-
> .../selftests/rcutorture/configs/rcu/SRCU-t | 10 +
> .../selftests/rcutorture/configs/rcu/SRCU-t.boot | 1 +
> .../selftests/rcutorture/configs/rcu/SRCU-u | 9 +
> .../selftests/rcutorture/configs/rcu/SRCU-u.boot | 1 +
> .../selftests/rcutorture/configs/rcu/TINY02 | 5 +-
> .../selftests/rcutorture/configs/rcu/TREE01 | 5 +-
> .../selftests/rcutorture/configs/rcu/TREE01.boot | 4 +
> .../selftests/rcutorture/configs/rcu/TREE02 | 5 +-
> .../selftests/rcutorture/configs/rcu/TREE03 | 4 -
> .../selftests/rcutorture/configs/rcu/TREE03.boot | 4 +
> .../selftests/rcutorture/configs/rcu/TREE04 | 4 -
> .../selftests/rcutorture/configs/rcu/TREE05 | 4 -
> .../selftests/rcutorture/configs/rcu/TREE05.boot | 3 +
> .../selftests/rcutorture/configs/rcu/TREE06 | 4 +-
> .../selftests/rcutorture/configs/rcu/TREE06.boot | 3 +
> .../selftests/rcutorture/configs/rcu/TREE07 | 6 -
> .../selftests/rcutorture/configs/rcu/TREE08 | 1 -
> .../selftests/rcutorture/configs/rcu/TREE08-T | 21 -
> .../selftests/rcutorture/configs/rcu/TREE08.boot | 1 +
> .../configs/{rcu/TREE02-T => rcuperf/TINY} | 19 +-
> .../selftests/rcutorture/configs/rcuperf/TREE | 1 -
> .../selftests/rcutorture/configs/rcuperf/TREE54 | 1 -
> .../testing/selftests/rcutorture/doc/TINY_RCU.txt | 1 -
> .../selftests/rcutorture/doc/TREE_RCU-kconfig.txt | 34 +-
> .../rcutorture/formal/srcu-cbmc/modify_srcu.awk | 2 +-
> 79 files changed, 1496 insertions(+), 4211 deletions(-)
> delete mode 100644 Documentation/RCU/trace.txt
> delete mode 100644 include/linux/srcuclassic.h
> create mode 100644 kernel/rcu/Kconfig
> create mode 100644 kernel/rcu/Kconfig.debug
> delete mode 100644 kernel/rcu/srcu.c
> delete mode 100644 kernel/rcu/tree_trace.c
> create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/SRCU-C.boot
> create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/SRCU-t
> create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/SRCU-t.boot
> create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/SRCU-u
> create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/SRCU-u.boot
> delete mode 100644 tools/testing/selftests/rcutorture/configs/rcu/TREE08-T
> rename tools/testing/selftests/rcutorture/configs/{rcu/TREE02-T => rcuperf/TINY} (50%)
>
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