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Re: netbsd-5 deadlocks when memory is low

On Thu, Sep 15, 2011 at 2:40 AM, Masao Uebayashi <> 
> On Thu, Sep 15, 2011 at 2:13 AM, Emmanuel Dreyfus <> 
> wrote:
>> Masao Uebayashi <> wrote:
>>> You're faulting on a busy (PG_BUSY) anon page whose owner is also an
>>> anon.  I suppose the page is being swapped either in or out...
>> The question is why does it fail to complete?
> Hmm, I don't see any relevant "if (PG_WANTED) wakeup(pg);" in swap
> code path, like that done in genfs_getpages().

Sorry, it's done in uvmfault_anonget() { if (we_own) { wakeup(); } }.

So what I can think of now is, the underlying bdev can't finish I/O
because it allocates memory to handle I/O requests?

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