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Date: Tue, 5 Feb 2013 13:13:36 +0100 From: Ingo Molnar <mingo@...nel.org> To: Frederic Weisbecker <fweisbec@...il.com> Cc: LKML <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>, Li Zhong <zhong@...ux.vnet.ibm.com>, Namhyung Kim <namhyung.kim@....com>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Paul Gortmaker <paul.gortmaker@...driver.com>, Peter Zijlstra <peterz@...radead.org>, Steven Rostedt <rostedt@...dmis.org>, Thomas Gleixner <tglx@...utronix.de>, Sedat Dilek <sedat.dilek@...il.com>, Gleb Natapov <gleb@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>, Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>, Christoph Lameter <cl@...ux.com> Subject: Re: [GIT PULL] cputime: Full dynticks task/cputime accounting v8 * Frederic Weisbecker <fweisbec@...il.com> wrote: > Ingo, > > Please pull the new full dynticks cputime accounting code that > can be found at: > > git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git > tags/full-dynticks-cputime-for-mingo > > It's exactly the same tag/HEAD as in my v7. I'm just making a new pull > request in order to restart a fresh thread like you suggested. The old > one was filled with a discussion with Steve about what we thought was a bug. > We concluded it was actually an unavoidable tiny error margin due to how we > consider the boundary between kernel and user space (tick uses user_mode(regs) > whereas generic vtime uses context tracking callbacks). The artificial > testcase we were using was making this margin visible. No big difference > should be found with real workloads though. So Steve gave his Ack on the pull > request. > > Then Christoph reported a build error but it doesn't belong to this tree: > it's about an old version of my full dynticks tree. > > So in the end I see no opposition for this tree to be pulled. If anybody > has any concern, please raise your hand here. > > Thanks. > > --- > This implements the cputime accounting on full dynticks CPUs. > > Typical cputime stats infrastructure relies on the timer tick and > its periodic polling on the CPU to account the amount of time > spent by the CPUs and the tasks per high level domains such as > userspace, kernelspace, guest, ... > > Now we are preparing to implement full dynticks capability on > Linux for Real Time and HPC users who want full CPU isolation. > This feature requires a cputime accounting that doesn't depend > on the timer tick. > > To implement it, this new cputime infrastructure plugs into > kernel/user/guest boundaries to take snapshots of cputime and > flush these to the stats when needed. This performs pretty > much like CONFIG_VIRT_CPU_ACCOUNTING except that context location > and cputime snaphots are synchronized between write and read > side such that the latter can safely retrieve the pending tickless > cputime of a task and add it to its latest cputime snapshot to > return the correct result to the user. > > Signed-off-by: Frederic Weisbecker <fweisbec@...il.com> > --- > > Frederic Weisbecker (8): > context_tracking: Export context state for generic vtime > cputime: Librarize per nsecs resolution cputime definitions > cputime: Move default nsecs_to_cputime() to jiffies based cputime > file > cputime: Generic on-demand virtual cputime accounting > cputime: Allow dynamic switch between tick/virtual based cputime > accounting > cputime: Use accessors to read task cputime stats > kvm: Prepare to add generic guest entry/exit callbacks > cputime: Safely read cputime of full dynticks CPUs > > arch/alpha/kernel/osf_sys.c | 6 +- > arch/ia64/include/asm/cputime.h | 92 +-------- > arch/ia64/include/asm/thread_info.h | 4 +- > arch/ia64/include/asm/xen/minstate.h | 2 +- > arch/ia64/kernel/asm-offsets.c | 2 +- > arch/ia64/kernel/entry.S | 16 +- > arch/ia64/kernel/fsys.S | 4 +- > arch/ia64/kernel/head.S | 4 +- > arch/ia64/kernel/ivt.S | 8 +- > arch/ia64/kernel/minstate.h | 2 +- > arch/ia64/kernel/time.c | 5 +- > arch/powerpc/configs/chroma_defconfig | 2 +- > arch/powerpc/configs/corenet64_smp_defconfig | 2 +- > arch/powerpc/configs/pasemi_defconfig | 2 +- > arch/powerpc/include/asm/cputime.h | 6 +- > arch/powerpc/include/asm/lppaca.h | 2 +- > arch/powerpc/include/asm/ppc_asm.h | 4 +- > arch/powerpc/kernel/entry_64.S | 4 +- > arch/powerpc/kernel/time.c | 5 +- > arch/powerpc/platforms/pseries/dtl.c | 6 +- > arch/powerpc/platforms/pseries/setup.c | 6 +- > arch/s390/kernel/vtime.c | 6 +- > arch/x86/kernel/apm_32.c | 11 +- > drivers/isdn/mISDN/stack.c | 7 +- > fs/binfmt_elf.c | 8 +- > fs/binfmt_elf_fdpic.c | 7 +- > fs/proc/array.c | 4 +- > include/asm-generic/cputime.h | 66 +----- > include/asm-generic/cputime_jiffies.h | 72 ++++++ > include/asm-generic/cputime_nsecs.h | 104 +++++++++ > include/linux/context_tracking.h | 28 +++ > include/linux/hardirq.h | 4 +- > include/linux/init_task.h | 11 + > include/linux/kernel_stat.h | 2 +- > include/linux/kvm_host.h | 55 ++++- > include/linux/sched.h | 40 ++++ > include/linux/tsacct_kern.h | 3 + > include/linux/vtime.h | 59 ++++-- > init/Kconfig | 23 ++- > kernel/acct.c | 6 +- > kernel/context_tracking.c | 43 +++-- > kernel/cpu.c | 4 +- > kernel/delayacct.c | 7 +- > kernel/exit.c | 10 +- > kernel/fork.c | 6 + > kernel/posix-cpu-timers.c | 28 ++- > kernel/sched/core.c | 1 + > kernel/sched/cputime.c | 298 +++++++++++++++++++++++--- > kernel/signal.c | 12 +- > kernel/softirq.c | 6 +- > kernel/time/tick-sched.c | 5 +- > kernel/tsacct.c | 44 +++- > 52 files changed, 842 insertions(+), 322 deletions(-) > create mode 100644 include/asm-generic/cputime_jiffies.h > create mode 100644 include/asm-generic/cputime_nsecs.h Pulled, thanks a lot Frederic! 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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