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SubjectRe: [PATCH v15 08/13] arch/arm64: enable task isolation functionality
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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