Re: oom-killer why ?

[Larry Woodman <lwoodman@redhat.com>]

On Mon, 2008-08-25 at 19:26 +0200, Marco Nietz wrote:
> It's should be possible to reproduce the oom, but it's a Production Server.

>   [<c014290b>] out_of_memory+0x25/0x13a
>   [<c0143d74>] __alloc_pages+0x1f5/0x275
>   [<c014a439>] __pte_alloc+0x11/0x9e
>   [<c014a576>] __handle_mm_fault+0xb0/0xa1f

> pagetables:152485

> Normal free:3664kB min:3756kB low:4692kB high:5632kB active:280kB 
> inactive:244kB present:901120kB pages_scanned:593 all_unreclaimable? yes

If it is allocating lowmem for ptepages CONFIG_HIGHPTE is not set so it
exhausts the Normal zone with wired pte pages and eventually OOM kills.

-----------------------------------------------------------------------
pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
{
        struct page *pte;

#ifdef CONFIG_HIGHPTE
        pte = alloc_pages(GFP_KERNEL|__GFP_HIGHMEM|__GFP_REPEAT|
__GFP_ZERO, 0);
#else
        pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
#endif
        if (pte)
                pgtable_page_ctor(pte);
        return pte;
}
-----------------------------------------------------------------------


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