Re: oops in copy_page_rep()
From: Hugh Dickins
Date: Sun Jan 06 2013 - 22:38:32 EST
On Sun, 6 Jan 2013, Dave Jones wrote:
> investigating the huge page theory a little further I'm a bit confused.
> The kernel on that machine has THP enabled, and the cpu supports it (an old amd64), but..
> $ cat /sys/kernel/mm/hugepages/hugepages-2048kB/*
> I was expecting at least one of those to be non-zero.
> /sys/kernel/mm/transparent_hugepage/khugepaged/full_scans and pages_collapsed
> are both non-zero, so it's been busy doing _something_.
> Is this expected behaviour ?
Yes. /sys/kernel/mm/hugepages/ is all about those dusty old opaque
hugepages you might have got from fs/hugetlbfs and mm/hugetlb.c; whereas
the splitting issue we suspect is peculiar to the dazzling new transparent
hugepages you get from mm/huge_memory.c.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/