Messages in this thread | | | Date | Mon, 15 Nov 2004 21:56:29 +0000 (GMT) | From | Hugh Dickins <> | Subject | Re: vm-pageout-throttling.patch: hanging in throttle_vm_writeout/blk_congestion_wait |
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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. It is begging for deadlocks: I'm not saying it couldn't be got to work, and of course it would be nice to boast that there's no such issue; but there are so many better places to invest such effort...
Hugh
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