Alistair John Strachan wrote:
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> On Monday 10 September 2007 14:08:45 Laurent Vivier wrote:
>> Avi Kivity wrote:
>>> Ingo Molnar wrote:
>>>> * Laurent Vivier <Laurent.Vivier@bull.net> wrote:
>>>>> Ingo, please, could you have a look to these patches ?
>>>>>
>>>>> The aim of these four patches is to introduce Virtual Machine time
>>>>> accounting.
>>>>>
>>>>> [PATCH 1/4] as recent CPUs introduce a third running state, after
>>>>> "user" and "system", we need a new field, "guest", in cpustat to
>>>>> store the time used by the CPU to run virtual CPU. Modify /proc/sta=
t
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>>>>> to display this new field.
>>>> the concept certainly looks sane to me.
>>>>
>>>> The heavy-handed use of #ifdefs uglifies the code to a large degree,=

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>>>> but this is not a fundamental problem: since basically all distros
>>>> have KVM enabled (and lguest benefits from this too), could you just=

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>>>> make all this new code unconditional?
>>> I imagine the embedded people will complain... perhaps move all the c=
ode
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>>> to a #ifdef section above with a full implementation and a stub
>>> implementation.
>> I'm going to repost patches without #ifdefs for readability.
>> Then we could discuss if we should introduce #ifdefs and how.
>=20
> If you could provide a summary of the size increase from your latest po=
st=20
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> (i.e., size of the kernel before and after) that might lay rest to some=
=20
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> theoretical complaints.

These patches add:

* at data structures level:

- one cputime64_t (8 bytes) per cpu
- two cputime_t (2 * 4 bytes) per signal_struct and one cputime_t per tas=
k_struct

* at processing level:

- display and convert one more value in show_stat() (fs/proc/proc_misc.c)=

- display and convert two more values in do_task_stat() (fs/proc/array.c)=

- manage (copy and add) one more value in __exit_signal() (kernel/exit.c)=

- initialize three more fields in copy_signal (kernel/fork.c)
- add a bit test in account_system_time() and if the bit is set call a ne=
w
function (46 bytes on x86_64).

Size of stripped kernel before (on x86_64):
vmlinux 7305064 bytes (not stripped 52643888 bytes)
Size of stripped kernel after:
vmlinux 7305064 bytes (not stripped 52677180 bytes)

means 0 bytes added ????

Laurent
--=20
------------- Laurent.Vivier@bull.net  --------------
          "Software is hard" - Donald Knuth