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Re: [Qemu-devel] qemu core file size

From: Paolo Bonzini
Subject: Re: [Qemu-devel] qemu core file size
Date: Mon, 6 Nov 2017 13:02:50 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0

On 06/11/2017 12:59, Fam Zheng wrote:
>>> Could you point out the patchset for the fix?
>> Between 447b0d0b9ee8a0ac216c3186e0f3c427a1001f0c and
>> 092aa2fc65b7a35121616aad8f39d47b8f921618.
> Not sure how these relate to the core size, but I've tested upstream
> (ec7a8bf0b8f7dc7288fe8745464ee8217528cc6c) and with dump-guest-core=off the 
> core
> file is 363M, still significantly larger than rss (~73M).
> What is bloating the core file?

My guess would have been fragmented heap.  The core file, unlike the
RSS, includes all the mmaped memory (e.g. from shared libraries) that
has never been used.

For example, all the Ceph/Gluster/PulseAudio/SPICE/whatever libraries
are included in the core file but likely are not in the RSS.


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