linux-kernel - Re: [PATCH v1 1/1] mm/vmalloc.c: Fix percpu free VM area search criteria

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Date:   Tue, 30 Jul 2019 15:37:33 -0700
From:   sathyanarayanan kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Uladzislau Rezki <urezki@...il.com>
Cc:     Dave Hansen <dave.hansen@...el.com>, akpm@...ux-foundation.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/1] mm/vmalloc.c: Fix percpu free VM area search
 criteria


On 7/30/19 3:34 PM, Uladzislau Rezki wrote:
> Hello, Sathyanarayanan.
>
>> I agree with Dave. I don't think this issue is related to NUMA. The problem
>> here is about the logic we use to find appropriate vm_area that satisfies
>> the offset and size requirements of pcpu memory allocator.
>>
>> In my test case, I can reproduce this issue if we make request with offset
>> (ffff000000) and size (600000).
>>
> Just to clarify, does it mean that on your setup you have only one area with the
> 600000 size and 0xffff000000 offset?
No, its 2 areas. with offset (0, ffff000000) and size (a00000, 600000).
>
> Thank you.
>
> --
> Vlad Rezki
>
-- 
Sathyanarayanan Kuppuswamy
Linux kernel developer