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SubjectRe: vm-pageout-throttling.patch: hanging in throttle_vm_writeout/blk_congestion_wait
Sami Farin wrote:

>On Mon, Nov 15, 2004 at 09:56:29PM +0000, Hugh Dickins wrote:
>
>
>>On Mon, 15 Nov 2004, Sami Farin wrote:
>>
>>
>>>this time I had some swapspace on /dev/loop1 (file-backed, reiserfs,
>>>loop-AES-2.2d)... I think (!) it caused this deadlock.
>>>
>>>
>>That's not at all surprising. See the swap_extent work Andrew did
>>for 2.5 (in mm/swapfile.c), by which swap to a swapfile now avoids
>>the filesystem altogether (except while swapon prepares the map of
>>disk blocks). By swapping to a loop device over a file, you're
>>sneaking past his work, and putting the filesystem back under swap.
>>
>>

Does Andrew's approach prevent putting swap on a compressed file (useful
for reiser4 once the compression plugin is stable, not reiserfs)? (And
no, I don't have any idea what the performance effect of that would be
before it is tried and benchmarked....)
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