Messages in this thread | | | Date | Fri, 26 Aug 2016 17:25:16 +0100 | From | Catalin Marinas <> | Subject | Re: [PATCH v15 08/13] arch/arm64: enable task isolation functionality |
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On Tue, Aug 16, 2016 at 05:19:31PM -0400, Chris Metcalf wrote: > In do_notify_resume(), call task_isolation_ready() for > TIF_TASK_ISOLATION tasks when we are checking the thread-info flags; > and after we've handled the other work, call task_isolation_enter() > for such tasks. To ensure we always call task_isolation_enter() when > returning to userspace, add _TIF_TASK_ISOLATION to _TIF_WORK_MASK, > while leaving the old bitmask value as _TIF_WORK_LOOP_MASK to > check while looping. > > We tweak syscall_trace_enter() slightly to carry the "flags" > value from current_thread_info()->flags for each of the tests, > rather than doing a volatile read from memory for each one. This > avoids a small overhead for each test, and in particular avoids > that overhead for TIF_NOHZ when TASK_ISOLATION is not enabled. > > We instrument the smp_send_reschedule() routine so that it checks for > isolated tasks and generates a suitable warning if we are about > to disturb one of them in strict or debug mode. > > Finally, report on page faults in task-isolation processes in > do_page_faults(). > > Signed-off-by: Chris Metcalf <cmetcalf@mellanox.com> > --- > arch/arm64/Kconfig | 1 + > arch/arm64/include/asm/thread_info.h | 5 ++++- > arch/arm64/kernel/ptrace.c | 18 +++++++++++++++--- > arch/arm64/kernel/signal.c | 10 ++++++++++ > arch/arm64/kernel/smp.c | 2 ++ > arch/arm64/mm/fault.c | 8 +++++++-
Not sure when/how this series will be merged (Will already picked patch 07/13 as a general clean-up) but this arm64 patch:
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
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