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Re: [PATCH 2/6] mm: mark all calls into the vmalloc subsystem as potentially sleeping

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On Wed, Oct 19, 2016 at 12:15:41PM +0100, Chris Wilson wrote:
> On Tue, Oct 18, 2016 at 08:56:07AM +0200, Christoph Hellwig wrote:
> > This is how everyone seems to already use them, but let's make that
> > explicit.
> 
> Ah, found an exception, vmapped stacks:

Oh, fun.  So if we can't require vfree to be called from process context
we also can't use a mutex to wait for the vmap flushing.  Given that we
free stacks from the scheduler context switch I also fear there is no
good way to get a sleepable context there.

The only other idea I had was to use vmap_area_lock for the protection
that purge_lock currently provides, but that would require some serious
refactoring to avoid recursive locking first.

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[RFC] reduce latency in __purge_vmap_area_lazy Christoph Hellwig <hch@lst.de> - 2016-10-18 09:00 +0200
  [PATCH 5/6] mm: turn vmap_purge_lock into a mutex Christoph Hellwig <hch@lst.de> - 2016-10-18 09:00 +0200
  [PATCH 2/6] mm: mark all calls into the vmalloc subsystem as potentially sleeping Christoph Hellwig <hch@lst.de> - 2016-10-18 09:00 +0200
    Re: [PATCH 2/6] mm: mark all calls into the vmalloc subsystem as  potentially sleeping Chris Wilson <chris@chris-wilson.co.uk> - 2016-10-18 12:40 +0200
      Re: [PATCH 2/6] mm: mark all calls into the vmalloc subsystem as         potentially sleeping Christoph Hellwig <hch@lst.de> - 2016-10-18 12:40 +0200
    Re: [PATCH 2/6] mm: mark all calls into the vmalloc subsystem as         potentially sleeping Christoph Hellwig <hch@lst.de> - 2016-10-19 16:30 +0200
      Re: [PATCH 2/6] mm: mark all calls into the vmalloc subsystem as  potentially sleeping Andy Lutomirski <luto@amacapital.net> - 2016-10-19 17:40 +0200
        Re: [PATCH 2/6] mm: mark all calls into the vmalloc subsystem as         potentially sleeping Christoph Hellwig <hch@lst.de> - 2016-10-19 18:40 +0200
          Re: [PATCH 2/6] mm: mark all calls into the vmalloc subsystem as  potentially sleeping Chris Wilson <chris@chris-wilson.co.uk> - 2016-10-19 21:50 +0200
          Re: [PATCH 2/6] mm: mark all calls into the vmalloc subsystem as  potentially sleeping Joel Fernandes <joelaf@google.com> - 2016-10-21 02:40 +0200
    Re: [PATCH 2/6] mm: mark all calls into the vmalloc subsystem as  potentially sleeping Chris Wilson <chris@chris-wilson.co.uk> - 2016-10-19 16:40 +0200
  [PATCH 1/6] mm: refactor __purge_vmap_area_lazy Christoph Hellwig <hch@lst.de> - 2016-10-18 09:00 +0200
  [PATCH 4/6] mm: remove free_unmap_vmap_area_addr Christoph Hellwig <hch@lst.de> - 2016-10-18 09:00 +0200
    Re: [PATCH 4/6] mm: remove free_unmap_vmap_area_addr Joel Fernandes <joelaf@google.com> - 2016-10-21 02:50 +0200
      Re: [PATCH 4/6] mm: remove free_unmap_vmap_area_addr Nicholas Piggin <npiggin@gmail.com> - 2016-10-21 04:00 +0200
  [PATCH 3/6] mm: remove free_unmap_vmap_area_noflush Christoph Hellwig <hch@lst.de> - 2016-10-18 09:00 +0200
  [PATCH 6/6] mm: add preempt points into __purge_vmap_area_lazy Christoph Hellwig <hch@lst.de> - 2016-10-18 09:00 +0200
    Re: [PATCH 6/6] mm: add preempt points into __purge_vmap_area_lazy Steven Rostedt <rostedt@goodmis.org> - 2016-10-18 23:00 +0200
      Re: [PATCH 6/6] mm: add preempt points into __purge_vmap_area_lazy Steven Rostedt <rostedt@goodmis.org> - 2016-10-18 23:10 +0200
  Re: [RFC] reduce latency in __purge_vmap_area_lazy Nicholas Piggin <npiggin@gmail.com> - 2016-10-18 12:50 +0200
  Re: [RFC] reduce latency in __purge_vmap_area_lazy Jisheng Zhang <jszhang@marvell.com> - 2016-10-18 13:30 +0200
  Re: [RFC] reduce latency in __purge_vmap_area_lazy Joel Fernandes <joelaf@google.com> - 2016-10-21 03:10 +0200

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