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* pahole BRAIN FART ALERT on F12
@ 2009-11-23 22:17 Mike Snitzer
       [not found] ` <20091123221703.GA10860-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
  0 siblings, 1 reply; 7+ messages in thread
From: Mike Snitzer @ 2009-11-23 22:17 UTC (permalink / raw)
  To: Arnaldo de Melo; +Cc: dwarves-u79uwXL29TY76Z2rM5mHXA

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
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^ permalink raw reply	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2009-11-24 15:18 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2009-11-23 22:17 pahole BRAIN FART ALERT on F12 Mike Snitzer
     [not found] ` <20091123221703.GA10860-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2009-11-23 22:49   ` Arnaldo de Melo
     [not found]     ` <20091123224921.GA9654-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>
2009-11-23 22:56       ` Mike Snitzer
     [not found]         ` <20091123225615.GD10860-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2009-11-24  0:10           ` Arnaldo de Melo
     [not found]             ` <20091124001047.GF15547-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>
2009-11-24 13:28               ` Mike Snitzer
     [not found]                 ` <20091124132831.GA31662-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2009-11-24 14:52                   ` Arnaldo de Melo
     [not found]                     ` <20091124145212.GC9654-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>
2009-11-24 15:18                       ` Mike Snitzer

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