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Re: [Xen-devel] [Memory Accounting] was: Re: PVH dom0 creation fails - the system freezes
- To: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, bercarug@xxxxxxxxxx
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Thu, 26 Jul 2018 11:41:24 +0200
- Autocrypt: addr=jgross@xxxxxxxx; prefer-encrypt=mutual; keydata= xsBNBFOMcBYBCACgGjqjoGvbEouQZw/ToiBg9W98AlM2QHV+iNHsEs7kxWhKMjrioyspZKOB ycWxw3ie3j9uvg9EOB3aN4xiTv4qbnGiTr3oJhkB1gsb6ToJQZ8uxGq2kaV2KL9650I1SJve dYm8Of8Zd621lSmoKOwlNClALZNew72NjJLEzTalU1OdT7/i1TXkH09XSSI8mEQ/ouNcMvIJ NwQpd369y9bfIhWUiVXEK7MlRgUG6MvIj6Y3Am/BBLUVbDa4+gmzDC9ezlZkTZG2t14zWPvx XP3FAp2pkW0xqG7/377qptDmrk42GlSKN4z76ELnLxussxc7I2hx18NUcbP8+uty4bMxABEB AAHNHkp1ZXJnZW4gR3Jvc3MgPGpncm9zc0BzdXNlLmRlPsLAeQQTAQIAIwUCU4xw6wIbAwcL CQgHAwIBBhUIAgkKCwQWAgMBAh4BAheAAAoJELDendYovxMvi4UH/Ri+OXlObzqMANruTd4N zmVBAZgx1VW6jLc8JZjQuJPSsd/a+bNr3BZeLV6lu4Pf1Yl2Log129EX1KWYiFFvPbIiq5M5 kOXTO8Eas4CaScCvAZ9jCMQCgK3pFqYgirwTgfwnPtxFxO/F3ZcS8jovza5khkSKL9JGq8Nk czDTruQ/oy0WUHdUr9uwEfiD9yPFOGqp4S6cISuzBMvaAiC5YGdUGXuPZKXLpnGSjkZswUzY d9BVSitRL5ldsQCg6GhDoEAeIhUC4SQnT9SOWkoDOSFRXZ+7+WIBGLiWMd+yKDdRG5RyP/8f 3tgGiB6cyuYfPDRGsELGjUaTUq3H2xZgIPfOwE0EU4xwFgEIAMsx+gDjgzAY4H1hPVXgoLK8 B93sTQFN9oC6tsb46VpxyLPfJ3T1A6Z6MVkLoCejKTJ3K9MUsBZhxIJ0hIyvzwI6aYJsnOew cCiCN7FeKJ/oA1RSUemPGUcIJwQuZlTOiY0OcQ5PFkV5YxMUX1F/aTYXROXgTmSaw0aC1Jpo w7Ss1mg4SIP/tR88/d1+HwkJDVW1RSxC1PWzGizwRv8eauImGdpNnseneO2BNWRXTJumAWDD pYxpGSsGHXuZXTPZqOOZpsHtInFyi5KRHSFyk2Xigzvh3b9WqhbgHHHE4PUVw0I5sIQt8hJq 5nH5dPqz4ITtCL9zjiJsExHuHKN3NZsAEQEAAcLAXwQYAQIACQUCU4xwFgIbDAAKCRCw3p3W KL8TL0P4B/9YWver5uD/y/m0KScK2f3Z3mXJhME23vGBbMNlfwbr+meDMrJZ950CuWWnQ+d+ Ahe0w1X7e3wuLVODzjcReQ/v7b4JD3wwHxe+88tgB9byc0NXzlPJWBaWV01yB2/uefVKryAf AHYEd0gCRhx7eESgNBe3+YqWAQawunMlycsqKa09dBDL1PFRosF708ic9346GLHRc6Vj5SRA UTHnQqLetIOXZm3a2eQ1gpQK9MmruO86Vo93p39bS1mqnLLspVrL4rhoyhsOyh0Hd28QCzpJ wKeHTd0MAWAirmewHXWPco8p1Wg+V+5xfZzuQY0f4tQxvOpXpt4gQ1817GQ5/Ed/wsDtBBgB CAAgFiEEhRJncuj2BJSl0Jf3sN6d1ii/Ey8FAlrd8NACGwIAgQkQsN6d1ii/Ey92IAQZFggA HRYhBFMtsHpB9jjzHji4HoBcYbtP2GO+BQJa3fDQAAoJEIBcYbtP2GO+TYsA/30H/0V6cr/W V+J/FCayg6uNtm3MJLo4rE+o4sdpjjsGAQCooqffpgA+luTT13YZNV62hAnCLKXH9n3+ZAgJ RtAyDWk1B/0SMDVs1wxufMkKC3Q/1D3BYIvBlrTVKdBYXPxngcRoqV2J77lscEvkLNUGsu/z W2pf7+P3mWWlrPMJdlbax00vevyBeqtqNKjHstHatgMZ2W0CFC4hJ3YEetuRBURYPiGzuJXU pAd7a7BdsqWC4o+GTm5tnGrCyD+4gfDSpkOT53S/GNO07YkPkm/8J4OBoFfgSaCnQ1izwgJQ jIpcG2fPCI2/hxf2oqXPYbKr1v4Z1wthmoyUgGN0LPTIm+B5vdY82wI5qe9uN6UOGyTH2B3p hRQUWqCwu2sqkI3LLbTdrnyDZaixT2T0f4tyF5Lfs+Ha8xVMhIyzNb1byDI5FKCb
- Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, David Woodhouse <dwmw2@xxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, abelgun@xxxxxxxxxx
- Delivery-date: Thu, 26 Jul 2018 09:41:40 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 26/07/18 01:07, Boris Ostrovsky wrote:
> On 07/25/2018 02:56 PM, Andrew Cooper wrote:
>> On 25/07/18 17:29, Juergen Gross wrote:
>>> On 25/07/18 18:12, Roger Pau Monné wrote:
>>>> On Wed, Jul 25, 2018 at 05:05:35PM +0300, bercarug@xxxxxxxxxx wrote:
>>>>> On 07/25/2018 05:02 PM, Wei Liu wrote:
>>>>>> On Wed, Jul 25, 2018 at 03:41:11PM +0200, Juergen Gross wrote:
>>>>>>> On 25/07/18 15:35, Roger Pau Monné wrote:
>>>>>>>>> What could be causing the available memory loss problem?
>>>>>>>> That seems to be Linux aggressively ballooning out memory, you go from
>>>>>>>> 7129M total memory to 246M. Are you creating a lot of domains?
>>>>>>> This might be related to the tools thinking dom0 is a PV domain.
>>>>>> Good point.
>>>>>>
>>>>>> In that case, xenstore-ls -fp would also be useful. The output should
>>>>>> show the balloon target for Dom0.
>>>>>>
>>>>>> You can also try to set the autoballoon to off in /etc/xen/xl.cfg to see
>>>>>> if it makes any difference.
>>>>>>
>>>>>> Wei.
>>>>> Also tried setting autoballooning off, but it had no effect.
>>>> This is a Linux/libxl issue that I'm not sure what's the best way to
>>>> solve. Linux has the following 'workaround' in the balloon driver:
>>>>
>>>> err = xenbus_scanf(XBT_NIL, "memory", "static-max", "%llu",
>>>> &static_max);
>>>> if (err != 1)
>>>> static_max = new_target;
>>>> else
>>>> static_max >>= PAGE_SHIFT - 10;
>>>> target_diff = xen_pv_domain() ? 0
>>>> : static_max - balloon_stats.target_pages;
>>> Hmm, shouldn't PVH behave the same way as PV here? I don't think
>>> there is memory missing for PVH, opposed to HVM's firmware memory.
>>>
>>> Adding Boris for a second opinion.
>
> (Notwithstanding Andrews' rant below ;-))
>
> I am trying to remember --- what memory were we trying not to online for
> HVM here?
The problem was to not online memory automatically which was added later
via hotplug (especially NVDIMMs). This happened as the reported memory
sizes via E820 map and hypervisor differed due to HVM's firmware memory.
So the initial target size was larger than the initial memory size
reported via E820 map. This led to automatic ballooning up when a NVDIMM
was added to the HVM guest.
Juergen
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