Benjamin Herrenschmidt wrote: > On Tue, 2008-09-02 at 17:16 -0500, Jon Tollefson wrote: > >> Benjamin Herrenschmidt wrote: >> >>>> Actually, Jon has been hitting an occasional pagetable lock related >>>> problem. The last theory was that it might be some sort of race but it's >>>> vaguely possible that this is the issue. Jon? >>>> >>>> >>> All hugetlbfs ops should be covered by the big PTL except walking... Can >>> we have more info about the problem ? >>> >>> Cheers, >>> Ben. >>> >>> >> I hit this when running the complete libhugetlbfs test suite (make >> check) with base page at 4K and default huge page size at 16G. It is on >> the last test (shm-getraw) when it hits it. Just running that test >> alone has not caused it for me - only when I have run all the tests and >> it gets to this one. Also it doesn't happen every time. I have tried >> to reproduce as well with a 64K base page but haven't seen it happen there. >> > > I don't see anything huge pages related in the backtraces which is > interesting ... > > Can you get us access to a machine with enough RAM to test the 16G > pages ? > > Ben. > > You can use the machine I have been using. I'll send you a note with the details on it after I test David's patch today.
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