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Message-ID: <20130812212834.GC27436@somewhere> Date: Mon, 12 Aug 2013 23:28:36 +0200 From: Frederic Weisbecker <fweisbec@...il.com> To: Ingo Molnar <mingo@...nel.org> Cc: LKML <linux-kernel@...r.kernel.org>, Steven Rostedt <rostedt@...dmis.org>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Thomas Gleixner <tglx@...utronix.de>, Peter Zijlstra <peterz@...radead.org>, Borislav Petkov <bp@...en8.de>, Li Zhong <zhong@...ux.vnet.ibm.com>, Mike Galbraith <efault@....de>, Kevin Hilman <khilman@...aro.org>, Martin Schwidefsky <schwidefsky@...ibm.com>, Heiko Carstens <heiko.carstens@...ibm.com>, Geert Uytterhoeven <geert@...ux-m68k.org>, Alex Shi <alex.shi@...el.com>, Paul Turner <pjt@...gle.com>, Vincent Guittot <vincent.guittot@...aro.org> Subject: Re: [GIT PULL] timers/nohz updates for 3.12 On Mon, Aug 12, 2013 at 08:44:28PM +0200, Ingo Molnar wrote: > > * Frederic Weisbecker <fweisbec@...il.com> wrote: > > > Ingo, > > > > Please pull the timers/nohz branch that can be found at: > > > > git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git > > timers/nohz > > > > It mostly contains fixes and full dynticks off-case optimizations. I believe that > > distros want to enable this feature so it seems important to optimize the case > > where the "nohz_full=" parameter is empty. ie: I'm trying to remove any performance > > regression that comes with NO_HZ_FULL=y when the feature is not used. > > > > This patchset improves the current situation a lot (off-case appears to be around 11% faster > > with hackbench, although I guess it may vary depending on the configuration but it should be > > significantly faster in any case) now there is still some work to do: I can still observe a > > remaining loss of 1.6% throughput seen with hackbench compared to CONFIG_NO_HZ_FULL=n > > > > Thanks, > > Frederic > > --- > > > > Frederic Weisbecker (23): > > sched: Consolidate open coded preemptible() checks > > context_tracing: Fix guest accounting with native vtime > > vtime: Update a few comments > > context_tracking: Fix runtime CPU off-case > > nohz: Only enable context tracking on full dynticks CPUs > > context_tracking: Remove full dynticks' hacky dependency on wide context tracking > > context_tracking: Ground setup for static key use > > context_tracking: Optimize main APIs off case with static key > > context_tracking: Optimize guest APIs off case with static key > > context_tracking: Optimize context switch off case with static keys > > context_tracking: User/kernel broundary cross trace events > > vtime: Remove a few unneeded generic vtime state checks > > vtime: Fix racy cputime delta update > > context_tracking: Split low level state headers > > hardirq: Split preempt count mask definitions > > m68k: hardirq_count() only need preempt_mask.h > > vtime: Describe overriden functions in dedicated arch headers > > vtime: Optimize full dynticks accounting off case with static keys > > vtime: Always scale generic vtime accounting results > > vtime: Always debug check snapshot source _before_ updating it > > nohz: Rename a few state variables > > nohz: Optimize full dynticks state checks with static keys > > nohz: Optimize full dynticks's sched hooks with static keys > > > > > > arch/ia64/include/asm/Kbuild | 1 + > > arch/m68k/include/asm/irqflags.h | 2 +- > > arch/powerpc/include/asm/Kbuild | 1 + > > arch/s390/include/asm/cputime.h | 3 - > > arch/s390/include/asm/vtime.h | 7 ++ > > arch/s390/kernel/vtime.c | 1 + > > include/linux/context_tracking.h | 120 +++++++++++++++-------------- > > include/linux/context_tracking_state.h | 39 +++++++++ > > include/linux/hardirq.h | 117 +---------------------------- > > include/linux/preempt_mask.h | 122 +++++++++++++++++++++++++++++ > > include/linux/tick.h | 45 +++++++++-- > > include/linux/vtime.h | 74 ++++++++++++++++-- > > include/trace/events/context_tracking.h | 58 ++++++++++++++ > > init/Kconfig | 28 +++++-- > > kernel/context_tracking.c | 128 ++++++++++++++++++------------- > > kernel/sched/core.c | 4 +- > > kernel/sched/cputime.c | 53 ++++--------- > > kernel/time/Kconfig | 1 - > > kernel/time/tick-sched.c | 56 ++++++-------- > > 19 files changed, 534 insertions(+), 326 deletions(-) > > When merged to -tip it causes this build error: > > kernel/time/tick-sched.c:186:3: error: 'have_nohz_full_mask' undeclared (first use in this function) > kernel/time/tick-sched.c:345:2: error: 'cpu' undeclared (first use in this function) Ah I see. This probably happened because of the merge against tip:timers/urgent The conflict is indeed probably not obvious to solve. > > config attached. > > I did what looked like to be an obvious conflict resolution to > tick-sched.c (attached), please double check that too. > > While at it, mind rebasing your changes to tip:timers/urgent, which has a > few nohz fixes pending as well? Ok, this way I can take care of the conflict. Thanks! -- 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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