Messages in this thread | | | Date | Thu, 28 Apr 2011 15:31:55 +0200 | From | Pavel Machek <> | Subject | Re: [PATCH 00/13] Swap-over-NBD without deadlocking |
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Hi!
> For testing swap-over-NBD, a machine was booted with 2G of RAM with a > swapfile backed by NBD. 16*NUM_CPU processes were started that create > anonymous memory mappings and read them linearly in a loop. The total > size of the mappings were 4*PHYSICAL_MEMORY to use swap heavily under > memory pressure. Without the patches, the machine locks up within > minutes and runs to completion with them applied. > > Comments?
Nice!
It is easy to see why swapping needs these fixes, but... dirty memory writeout is used for memory clearing, too. Are same changes neccessary to make that safe?
(Perhaps raise 'max dirty %' for testing?) Pavel
-- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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