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Date: Tue, 16 Aug 2016 17:19:23 -0400 From: Chris Metcalf <cmetcalf@...lanox.com> To: Gilad Ben Yossef <giladb@...lanox.com>, Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Andrew Morton <akpm@...ux-foundation.org>, Rik van Riel <riel@...hat.com>, Tejun Heo <tj@...nel.org>, Frederic Weisbecker <fweisbec@...il.com>, Thomas Gleixner <tglx@...utronix.de>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Christoph Lameter <cl@...ux.com>, Viresh Kumar <viresh.kumar@...aro.org>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will.deacon@....com>, Andy Lutomirski <luto@...capital.net>, Daniel Lezcano <daniel.lezcano@...aro.org>, Francis Giraldeau <francis.giraldeau@...il.com>, linux-doc@...r.kernel.org, linux-api@...r.kernel.org, linux-kernel@...r.kernel.org Cc: Chris Metcalf <cmetcalf@...lanox.com> Subject: [PATCH v15 00/13] support "task_isolation" mode Here is a respin of the task-isolation patch set. Again, I have been getting email asking me when and where this patch will be upstreamed so folks can start using it. I had been thinking the obvious path was via Frederic Weisbecker to Ingo as a NOHZ kind of thing. But perhaps it touches enough other subsystems that that doesn't really make sense? Andrew, would it make sense to take it directly via your tree? Frederic, Ingo, what do you think? Changes since v14: - Rebased on v4.8-rc2 (so incorporates my NOHZ bugfix vs v4.8-rc1) - Dropped Christoph Lameter's patch to avoid scheduling the clocksource watchdog on nohz cores; the recommendation is to just boot with tsc=reliable for NOHZ in any case, if necessary. - Optimize task_isolation_enter() by checking vmstat_idle() before calling quiet_vmstat_sync() [Frederic, Christoph] - Correct buggy x86 syscall_trace_enter() support [Andy] - Add _TIF_TASK_ISOLATION to x86 _TIF_ALLWORK_MASK; not technically necessary but good for self-documentation [Andy] - Improve comment for task_isolation_syscall() callsites to clarify that we are delivering a signal if we bail out of the syscall [Andy] - Ran the selftest through checkpatch and cleaned up style issues The previous (v14) patch series is here: https://lkml.kernel.org/r/1470774596-17341-1-git-send-email-cmetcalf@mellanox.com This version of the patch series has been tested on arm64 and tilegx, and build-tested on x86 (plus some volunteer testing on x86 by Christoph and Francis). It remains true that the 1 Hz tick needs to be disabled for this patch series to be able to achieve its primary goal of enabling truly tick-free operation, but that is ongoing orthogonal work. Frederic, do you have a sense of what is left to be done there? I can certainly try to contribute to that effort as well. The series is available at: git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile.git dataplane Chris Metcalf (13): vmstat: add quiet_vmstat_sync function vmstat: add vmstat_idle function lru_add_drain_all: factor out lru_add_drain_needed task_isolation: add initial support task_isolation: track asynchronous interrupts arch/x86: enable task isolation functionality arm64: factor work_pending state machine to C arch/arm64: enable task isolation functionality arch/tile: enable task isolation functionality arm, tile: turn off timer tick for oneshot_stopped state task_isolation: support CONFIG_TASK_ISOLATION_ALL task_isolation: add user-settable notification signal task_isolation self test Documentation/kernel-parameters.txt | 16 + arch/arm64/Kconfig | 1 + arch/arm64/include/asm/thread_info.h | 5 +- arch/arm64/kernel/entry.S | 12 +- arch/arm64/kernel/ptrace.c | 18 +- arch/arm64/kernel/signal.c | 42 +- arch/arm64/kernel/smp.c | 2 + arch/arm64/mm/fault.c | 8 +- arch/tile/Kconfig | 1 + arch/tile/include/asm/thread_info.h | 4 +- arch/tile/kernel/process.c | 9 + arch/tile/kernel/ptrace.c | 10 + arch/tile/kernel/single_step.c | 7 + arch/tile/kernel/smp.c | 26 +- arch/tile/kernel/time.c | 1 + arch/tile/kernel/unaligned.c | 4 + arch/tile/mm/fault.c | 13 +- arch/tile/mm/homecache.c | 2 + arch/x86/Kconfig | 1 + arch/x86/entry/common.c | 21 +- arch/x86/include/asm/thread_info.h | 4 +- arch/x86/kernel/smp.c | 2 + arch/x86/kernel/traps.c | 3 + arch/x86/mm/fault.c | 5 + drivers/base/cpu.c | 18 + drivers/clocksource/arm_arch_timer.c | 2 + include/linux/context_tracking_state.h | 6 + include/linux/isolation.h | 73 +++ include/linux/sched.h | 3 + include/linux/swap.h | 1 + include/linux/tick.h | 2 + include/linux/vmstat.h | 4 + include/uapi/linux/prctl.h | 10 + init/Kconfig | 37 ++ kernel/Makefile | 1 + kernel/fork.c | 3 + kernel/irq_work.c | 5 +- kernel/isolation.c | 338 +++++++++++ kernel/sched/core.c | 14 + kernel/signal.c | 15 + kernel/smp.c | 6 +- kernel/softirq.c | 33 ++ kernel/sys.c | 9 + kernel/time/tick-sched.c | 36 +- mm/swap.c | 15 +- mm/vmstat.c | 19 + tools/testing/selftests/Makefile | 1 + tools/testing/selftests/task_isolation/Makefile | 11 + tools/testing/selftests/task_isolation/config | 2 + tools/testing/selftests/task_isolation/isolation.c | 646 +++++++++++++++++++++ 50 files changed, 1470 insertions(+), 57 deletions(-) create mode 100644 include/linux/isolation.h create mode 100644 kernel/isolation.c create mode 100644 tools/testing/selftests/task_isolation/Makefile create mode 100644 tools/testing/selftests/task_isolation/config create mode 100644 tools/testing/selftests/task_isolation/isolation.c -- 2.7.2
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