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Re: [PATCH v13 00/12] support "task_isolation" mode

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On Thu, 14 Jul 2016, Andy Lutomirski wrote:

> As an example, enough vmalloc/vfree activity will eventually cause
> flush_tlb_kernel_range to be called and *boom*, there goes your shiny
> production dataplane application.  Once virtually mapped kernel stacks
> happen, the frequency with which this happens will only increase.

But then vmalloc/vfre activity is not to be expected if user space only is
running. Since the kernel is not active and this affects kernel address
space only it could be deferred. Such events will cause OS activity that
causes a number of high latency events but then the system will quiet down
again.

> On very brief inspection, __kmem_cache_shutdown will be a problem on
> some workloads as well.

These are all corner cases that can be worked on over time if they are
significant. The main issue here is to reduce the obvious and relatively
frequent causes for ticks and allow easier detection of events that cause
tick activity.

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[PATCH v13 00/12] support "task_isolation" mode Chris Metcalf <cmetcalf@mellanox.com> - 2016-07-14 22:50 +0200
  [PATCH v13 12/12] task_isolation: add user-settable notification signal Chris Metcalf <cmetcalf@mellanox.com> - 2016-07-14 22:50 +0200
  [PATCH v13 06/12] arch/x86: enable task isolation functionality Chris Metcalf <cmetcalf@mellanox.com> - 2016-07-14 22:50 +0200
  [PATCH v13 03/12] lru_add_drain_all: factor out lru_add_drain_needed Chris Metcalf <cmetcalf@mellanox.com> - 2016-07-14 22:50 +0200
  [PATCH v13 04/12] task_isolation: add initial support Chris Metcalf <cmetcalf@mellanox.com> - 2016-07-14 22:50 +0200
  [PATCH v13 09/12] arch/tile: enable task isolation functionality Chris Metcalf <cmetcalf@mellanox.com> - 2016-07-14 23:00 +0200
  [PATCH v13 01/12] vmstat: add quiet_vmstat_sync function Chris Metcalf <cmetcalf@mellanox.com> - 2016-07-14 23:00 +0200
  [PATCH v13 05/12] task_isolation: track asynchronous interrupts Chris Metcalf <cmetcalf@mellanox.com> - 2016-07-14 23:00 +0200
  Re: [PATCH v13 00/12] support "task_isolation" mode Andy Lutomirski <luto@amacapital.net> - 2016-07-14 23:10 +0200
    Re: [PATCH v13 00/12] support "task_isolation" mode Christoph Lameter <cl@linux.com> - 2016-07-18 02:50 +0200
    Re: [PATCH v13 00/12] support "task_isolation" mode Andy Lutomirski <luto@amacapital.net> - 2016-07-19 00:20 +0200
  Re: [PATCH v13 00/12] support "task_isolation" mode Christoph Lameter <cl@linux.com> - 2016-07-21 04:10 +0200
    Re: [PATCH v13 00/12] support "task_isolation" mode Christoph Lameter <cl@linux.com> - 2016-07-22 04:30 +0200
      Re: [PATCH v13 00/12] support "task_isolation" mode Christoph Lameter <cl@linux.com> - 2016-07-25 18:40 +0200

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