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Re: [Qemu-devel] qemu core file size


From: Fam Zheng
Subject: Re: [Qemu-devel] qemu core file size
Date: Mon, 6 Nov 2017 19:59:31 +0800
User-agent: Mutt/1.9.1 (2017-09-22)

On Mon, 11/06 11:26, Paolo Bonzini wrote:
> On 06/11/2017 11:01, Wanpeng Li wrote:
> > 2017-11-06 17:41 GMT+08:00 Paolo Bonzini <address@hidden>:
> >> On 06/11/2017 10:11, Wanpeng Li wrote:
> >>> Hi all,
> >>>
> >>> qemu core dump, max_core="unlimited", dump_guest_core=0, kill -11 pid
> >>> to generate a qemu core file, the Rss of qemu itself is ~40MB, the
> >>> core file is almost ~40MB in centos 6.x, but ~400MB in cents 7.x, any
> >>> idea?
> >>
> >> My suspicion is the memory API, which isn't used in CentOS 6.x.  QEMU
> >> 2.11 should fix that.
> > 
> > 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?

Fam



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