pahole BRAIN FART ALERT on F12

[Mike Snitzer <snitzer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

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?

Mike
--
To unsubscribe from this list: send the line "unsubscribe dwarves" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html