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Message-ID: <20111214154736.GA2419@elte.hu> Date: Wed, 14 Dec 2011 16:47:36 +0100 From: Ingo Molnar <mingo@...e.hu> To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Frédéric Weisbecker <fweisbec@...il.com>, Suresh Siddha <suresh.b.siddha@...el.com>, Peter Zijlstra <a.p.zijlstra@...llo.nl> Cc: tglx@...utronix.de, fweisbec@...il.com, josh@...htriplett.org, keescook@...omium.org, linux-kernel@...r.kernel.org Subject: Re: [GIT PULL rcu/next] RCU commits for 3.3 * Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote: > Hello, Ingo, > > The major features of this series are RCU infrastructure in > support of Frederic Weisbecker's tickless userspace work and a > reworked RCU_FAST_NO_HZ that improves energy efficiency on > large lightly loaded SMP systems by allowing the > scheduler-clock tick to be turned off more quickly upon entry > to idle, even when RCU callbacks are queued on the newly idle > CPU. In addition, RCU_FAST_NO_HZ may now be used on systems > running TREE_PREEMPT_RCU, where earlier it was restricted to > TREE_RCU. > > In addition, this series provides additional event tracing, > rcutorture changes that improve automated KVM-based testing of > RCU, introduces an srcu_read_lock_raw() needed by uprobes, and > ports a couple of patches from -rt to mainline. Finally, this > series updates documentation, improves diagnostics, and fixes > a number of bugs, including a nasty use of RCU from the idle > task spotted and fixed by Frederic Weisbecker. > > These commits have been posted to LKML and updated based on > feedback: > > https://lkml.org/lkml/2011/11/2/363 > https://lkml.org/lkml/2011/11/15/302 > https://lkml.org/lkml/2011/11/28/588 > https://lkml.org/lkml/2011/12/3/77 > https://lkml.org/lkml/2011/12/12/625 > > They have also been exposed to -next testing. > > These changes are based off of 3.2-rc5 and are available at > the git repository at: > > git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next > > Could you please pull them into -tip for additional testing? > > Thanx, Paul > > ------------------> > Frederic Weisbecker (11): > rcu: Detect illegal rcu dereference in extended quiescent state > rcu: Inform the user about extended quiescent state on PROVE_RCU warning > rcu: Warn when rcu_read_lock() is used in extended quiescent state > nohz: Separate out irq exit and idle loop dyntick logic > nohz: Allow rcu extended quiescent state handling seperately from tick stop > x86: Enter rcu extended qs after idle notifier call > x86: Call idle notifier after irq_enter() > rcu: Fix early call to rcu_idle_enter() > nohz: Remove tick_nohz_idle_enter_norcu() / tick_nohz_idle_exit_norcu() > rcu: Don't check irq nesting from rcu idle entry/exit > rcu: Irq nesting is always 0 on rcu_enter_idle_common > > Josh Triplett (1): > driver-core/cpu: Expose hotpluggability to the rest of the kernel > > Kees Cook (1): > docs: Additional LWN links to RCU API > > Paul E. McKenney (49): > rcu: ->signaled better named ->fqs_state > rcu: Avoid RCU-preempt expedited grace-period botch > rcu: Make synchronize_sched_expedited() better at work sharing > lockdep: Update documentation for lock-class leak detection > rcu: Track idleness independent of idle tasks > trace: Allow ftrace_dump() to be called from modules > rcu: Add failure tracing to rcutorture > rcu: Document failing tick as cause of RCU CPU stall warning > rcu: Disable preemption in rcu_is_cpu_idle() > rcu: Remove one layer of abstraction from PROVE_RCU checking > rcu: Warn when srcu_read_lock() is used in an extended quiescent state > rcu: Make srcu_read_lock_held() call common lockdep-enabled function > powerpc: Tell RCU about idle after hcall tracing > rcu: Introduce raw SRCU read-side primitives > rcu: Add documentation for raw SRCU read-side primitives > rcu: Deconfuse dynticks entry-exit tracing > rcu: Add more information to the wrong-idle-task complaint > rcu: Allow dyntick-idle mode for CPUs with callbacks > rcu: Fix idle-task checks > rcu: Permit RCU_FAST_NO_HZ to be used by TREE_PREEMPT_RCU > rcu: Add rcutorture system-shutdown capability > rcu: Control rcutorture startup from kernel boot parameters > sched: Add is_idle_task() to handle invalidated uses of idle_cpu() > rcu: Make RCU use the new is_idle_task() API > sparc: Make SPARC use the new is_idle_task() API > kdb: Make KDB use the new is_idle_task() API > events: Make events use the new is_idle_task() API > tile: Make tile use the new is_idle_task() API > rcu: Add rcutorture CPU-hotplug capability > doc: Add load/store guarantees to Documentation/atomic-ops.txt > rcu: Update trace_rcu_dyntick() header comment > rcu: Add tracing for RCU_FAST_NO_HZ > rcu: Go dyntick-idle more quickly if CPU has serviced current grace period > rcu: Avoid needlessly IPIing CPUs at GP end > rcu: Eliminate RCU_FAST_NO_HZ grace-period hang > rcu: Reduce latency of rcu_prepare_for_idle() > rcu: Remove dynticks false positives and RCU failures > rcu: Identify dyntick-idle CPUs on first force_quiescent_state() pass > rcu: Document same-context read-side constraints > rcu: Permit dyntick-idle with callbacks pending > rcu: Keep invoking callbacks if CPU otherwise idle > rcu: Adaptive dyntick-idle preparation > rcu: Remove redundant rcu_cpu_stall_suppress declaration > rcu: Make rcutorture test for hotpluggability before offlining CPUs > rcu: Add rcutorture tests for srcu_read_lock_raw() > rcu: Augment rcu_batch_end tracing for idle and callback state > Revert "rcu: Permit rt_mutex_unlock() with irqs disabled" > rcu: Apply ACCESS_ONCE() to rcu_boost() return value > cpu: Export cpu_up() > > Thomas Gleixner (2): > rcu: Omit self-awaken when setting up expedited grace period > rcu: Remove redundant return from rcu_report_exp_rnp() > > Documentation/RCU/checklist.txt | 6 + > Documentation/RCU/rcu.txt | 10 +- > Documentation/RCU/stallwarn.txt | 16 +- > Documentation/RCU/torture.txt | 13 ++ > Documentation/RCU/trace.txt | 4 - > Documentation/RCU/whatisRCU.txt | 19 ++- > Documentation/atomic_ops.txt | 87 +++++++++ > Documentation/lockdep-design.txt | 63 +++++++ > arch/arm/kernel/process.c | 6 +- > arch/avr32/kernel/process.c | 6 +- > arch/blackfin/kernel/process.c | 6 +- > arch/microblaze/kernel/process.c | 6 +- > arch/mips/kernel/process.c | 6 +- > arch/openrisc/kernel/idle.c | 6 +- > arch/powerpc/kernel/idle.c | 15 ++- > arch/powerpc/platforms/iseries/setup.c | 12 +- > arch/powerpc/platforms/pseries/lpar.c | 4 + > arch/s390/kernel/process.c | 6 +- > arch/sh/kernel/idle.c | 6 +- > arch/sparc/kernel/process_64.c | 6 +- > arch/sparc/kernel/setup_32.c | 2 +- > arch/tile/kernel/process.c | 6 +- > arch/tile/mm/fault.c | 4 +- > arch/um/kernel/process.c | 6 +- > arch/unicore32/kernel/process.c | 6 +- > arch/x86/kernel/apic/apic.c | 6 +- > arch/x86/kernel/apic/io_apic.c | 2 +- > arch/x86/kernel/cpu/mcheck/therm_throt.c | 2 +- > arch/x86/kernel/cpu/mcheck/threshold.c | 2 +- > arch/x86/kernel/irq.c | 6 +- > arch/x86/kernel/process_32.c | 6 +- > arch/x86/kernel/process_64.c | 10 +- > drivers/base/cpu.c | 7 + > include/linux/cpu.h | 1 + > include/linux/hardirq.h | 21 --- > include/linux/rcupdate.h | 115 ++++++++----- > include/linux/sched.h | 8 + > include/linux/srcu.h | 87 ++++++++-- > include/linux/tick.h | 11 +- > include/trace/events/rcu.h | 122 +++++++++++-- > init/Kconfig | 10 +- > kernel/cpu.c | 1 + > kernel/debug/kdb/kdb_support.c | 2 +- > kernel/events/core.c | 2 +- > kernel/lockdep.c | 22 +++ > kernel/rcu.h | 7 + > kernel/rcupdate.c | 12 ++ > kernel/rcutiny.c | 149 +++++++++++++-- > kernel/rcutiny_plugin.h | 29 +++- > kernel/rcutorture.c | 225 ++++++++++++++++++++++- > kernel/rcutree.c | 290 +++++++++++++++++++++--------- > kernel/rcutree.h | 26 ++-- > kernel/rcutree_plugin.h | 289 ++++++++++++++++++++++++------ > kernel/rcutree_trace.c | 12 +- > kernel/rtmutex.c | 8 - > kernel/softirq.c | 4 +- > kernel/time/tick-sched.c | 97 ++++++---- > kernel/trace/trace.c | 1 + > 58 files changed, 1512 insertions(+), 407 deletions(-) Pulled into tip:core/rcu, thanks a lot Paul! Note that this commit from Frederic: 69e1e811dcc4: sched, nohz: Track nr_busy_cpus in the sched_group_power conflicted with this commit from Suresh in sched/core: 69e1e811dcc4: sched, nohz: Track nr_busy_cpus in the sched_group_power I resolved it by making the set_cpu_sd_state_idle() call unconditional within the newly decoupled tick_nohz_stop_sched_tick() function - please double check that it's the right resolution. Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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