Messages in this thread | | | Date | Thu, 24 Jun 2004 16:45:20 -0700 | From | William Lee Irwin III <> | Subject | Re: [discuss] Re: 32-bit dma allocations on 64-bit platforms |
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On Fri, Jun 25, 2004 at 01:21:57AM +0200, Andrea Arcangeli wrote: > what you have to do is this: > 1) swapoff -a (it must not fail!! it cannot fail if you run it first) > 2) fill 130000K in pagecache, be very careful, not more than that, every > mbyte matters > 3) run your program and allocate 904000K!!! (not 512M!!!) > then keep using the machine until it lockups because it cannot reloate > the anonymous memory from the 900M of lowmem to the 130M of highmem. > But really I said you need >=2G to have a realistic chance of seeing it. > So don't be alarmed you cannot reproduce on a 1G box by allocating 512M > and with swap still enabled, you had none of the conditions that make it > reproducible. > I reproduced this dozen of times so I know how to reproduce it very > well (amittedly not in 2.6 because nobody crashed on this yet).
This resembles the more sophisticated testcase I originally had in mind. I'll be out for a couple of hours and then I'll fix this up.
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