Re: [PATCH 01/15] mm: poison struct page for ptlock

* Andrew Morton <[email protected]> wrote:

> Andrew Morton <[email protected]> wrote:
> >
> >  Well plan B is to kill spinlock_t.break_lock.
> 
> And plan C is to use a bit_spinlock() against page->flags.

please dont. Bit-spinlock is a PITA because it is non-debuggable and 
non-preempt-friendly. (In fact in -rt i have completely eliminated 
bit_spinlock(), because it's also such a PITA to type-encapsulate it 
sanely.)

	Ingo
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References:
- [PATCH 00/15] mm: struct page lock and counts
  - From: Hugh Dickins <[email protected]>
- [PATCH 01/15] mm: poison struct page for ptlock
  - From: Hugh Dickins <[email protected]>
- Re: [PATCH 01/15] mm: poison struct page for ptlock
  - From: Andrew Morton <[email protected]>
- Re: [PATCH 01/15] mm: poison struct page for ptlock
  - From: Hugh Dickins <[email protected]>
- Re: [PATCH 01/15] mm: poison struct page for ptlock
  - From: Andrew Morton <[email protected]>
- Re: [PATCH 01/15] mm: poison struct page for ptlock
  - From: Andrew Morton <[email protected]>

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