Em Mon, Nov 23, 2009 at 05:17:03PM -0500, Mike Snitzer escreveu:
> Hi,
>
> I just found out about pahole today. I'm looking to audit lvm2's data
> structures and pahole is perfect for helping me do so.
>
> Unfortunately, when I run pahole against lvm2 I'm getting many BRAIN
> FART ALERTs on F12 x86_64 (dwarves-1.7-5.x86_64). I had a look at your
> OLS 2007 "7 dwarves" paper and figured I'd try your minimalist
> swiss_cheese example, this is what I get:
>
> $ pahole swiss_cheese
> struct cheese {
> char name[17]; /* 0 17 */
> short int age; /* 0 2 */
> char type; /* 0 1 */
> int calories; /* 0 4 */
> short int price; /* 0 2 */
> int barcode[4]; /* 0 16 */
>
> /* size: 48, cachelines: 1, members: 6 */
> /* padding: 32 */
> /* last cacheline: 48 bytes */
>
> /* BRAIN FART ALERT! 48 != 17 + 0(holes), diff = 31 */
>
> };
>
> When I compare the above to the output listed in your paper it is clear
> pahole is pretty unhappy on F12. If I do the same on F11 (x86_64) all
> works fine.
>
> Should I open a fedora (F12) bug?
You should, I think this is related to some recent elfutils changes that
Mark Wieelard warned me about it but I hadn't time yet to act upon, will
do so tomorrow, thanks for the report!
Some milliseconds ago I was almost going to suggest you using the git
version, but then I realized this is too strange to seem like something
I could have fixed in the git repository :-\
That also should be another reason for me to do the f11->f12 step :-)
Thanks!
- Arnaldo
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