VIMAGE status

[Olivier SMEDTS]

2009/5/2 Julian Elischer <julian at elischer.org>:
> The VIMAGE code is nearly all in the the kernel.
>
> One is now able to make VIMAGE kernels (add options VIMAGE)
> though they don't actually allow you to make multiple
> vimages instances yet..
>
> The VIMAGE option enables all the low level changes needed
> throughout the kernel.
>
> The VIMAGE_GLOBALS option basically sets thing sback to how they were
> before.
>
> Having neither (the default) gives a kernel that is a kind of hybrid.
>
> The Hybrid state is what will go forward as 'NON-VIMAGE' mode
> and the VIMAGE_GLOBALS mode will probably go away in time as
> it complicates the code.
>
> The aim of this mail is to ask people to try add the VIMAGE option
> to their regular kernels and try use them as you woudl normally.
> You will not yet be able to use any new VIMAGE features but we
> should be fully compatible with previous kernels.

Here is a warning I have when building kernel with options VIMAGE and INET6 :

cc -c -O2 -pipe -march=native -fno-strict-aliasing -std=c99 -g -Wall
-Wredundant-decls -Wnested-externs -Wstrict-prototypes
-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -Wundef
-Wno-pointer-sign -fformat-extensions -nostdinc  -I.  -I/work/src/sys
-I/work/src/sys/contrib/altq -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS
-include opt_global.h -fno-common -finline-limit=8000 --param
inline-unit-growth=100 --param large-function-growth=1000
-mcmodel=kernel -mno-red-zone  -mfpmath=387 -mno-sse -mno-sse2
-mno-sse3 -mno-mmx -mno-3dnow  -msoft-float
-fno-asynchronous-unwind-tables -ffreestanding -fstack-protector
-Werror  /work/src/sys/netinet6/mld6.c
cc1: warnings being treated as errors
/work/src/sys/netinet6/mld6.c: In function 'vnet_mld_idetach':
/work/src/sys/netinet6/mld6.c:3145: warning: unused variable 'vnet_inet6'
*** Error code 1

>
> Please report any concerns to the freebsd-virtualization@ mailing list.
>
> THEORETICALLY you should not see any changes in behaviour, however we have
> the following issues:
>
> * SCTP is not fully converted yet. add 'nooptions SCTP' for now if you
>  are not using it yet.
>
> * An NFS (crash) issue was reported. This MAY have been fixed...
>
>
> Theory tells us that all three kernel options should behave about the same
> but if you do try this, and have any benchmarking facilities,
> it would be incredibly useful if you could let us know if you see any
> performance changes between the three.
>
>
> thanks,
>
> Julian (currently running a VIMAGE kernel myself)
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>



-- 
Olivier Smedts                                                 _
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