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Re: [Xen-users] What is the difference between "xen", "xen-syms" and "xen-*-dbg" files?

Hi Ian,

Thanks very much for this detailed explanation!
Best Regards
Nan Xiao

On Tue, Nov 17, 2015 at 5:49 PM, Ian Campbell <ian.campbell@xxxxxxxxxx> wrote:
> On Tue, 2015-11-17 at 09:34 +0800, Nan Xiao wrote:
>> Hi all,
>> Since I am a newbie of Xen, this may be a dumb question. On my SuSE
>> Xen, I find the following
>> 4 "Xen" files:
>> -rw-r--r-- 1 root root   881967 Oct 27 05:46 xen-4.5.1_10-1.gz
>> -rw-r--r-- 1 root root 16673080 Oct 27 05:46 xen-syms-4.5.1_10-1
>> -rw-r--r-- 1 root root   893428 Oct 27 05:45 xen-dbg-4.5.1_10-1.gz
>> -rw-r--r-- 1 root root 16124144 Oct 27 05:45 xen-syms-dbg-4.5.1_10-1
>> Could anyone give a detailed explanation of the functions and
>> differences about the 4 files?
> TL;DR: Use xen-04.5.1_1-1.gz unless someone asks you to do otherwise or you
> are tracking down a bug.
> xen.gz is the main/regular/normal release build of the Xen binary (e.g. the
> thing which you can boot). This is the thing you would boot on a regular
> production Xen system.
> xen-syms.gz is the unstripped version of xen.gz, i.e. with all the ELF
> debug information present. You can e.g. run gdb on it to disassemble things
> if you are tracking down a bug. This image is not bootable.
> The -dbg variants are not something which upstream produces, but I would
> assume that they are build with the debug=y, which means they will contain
> extra ASSERT statements and other things which aid debugging possibly at
> the expense of performance. Release builds (xen.gz et al) are build with
> debug=n. Like the release builds the xen-*-dbg ones come in the bootable
> (xen-dbg.gz) and xen-syms-dbg.gz variants, with the same distinction (the
> former is bootable, the latter is for running gdb on)
> Ian.
>> I try to google, but can't find the answers.
>> Thanks in advance!
>> Best Regards
>> Nan Xiao
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>> Xen-users@xxxxxxxxxxxxx
>> http://lists.xen.org/xen-users

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