On Fri, 4 May 2007 08:24:34 -0300
"Arnaldo Carvalho de Melo" <[EMAIL PROTECTED]> wrote:
> On 5/4/07, Eric Dumazet <[EMAIL PROTECTED]> wrote:
> > Hum, maybe not enough tea this morning, but I always thought spinlock_t size
> > was 4 bytes....
>
> Well, unfolding sk_buff_head to see the details:
>
> [EMAIL PROTECTED] linux-2.6]$ pahole --expand_types -C sk_buff_head
> net/core/sock.o
> /* <9a61> /home/acme/git/linux-2.6/include/linux/skbuff.h:111 */
> struct sk_buff_head {
> struct sk_buff * next; /* 0 8 */
> struct sk_buff * prev; /* 8 8 */
> /* typedef __u32 */ unsigned int qlen; /* 16 4 */
> /* typedef spinlock_t */ struct {
> /* typedef raw_spinlock_t */ struct {
> unsigned int slock; /* 20 4 */
> } raw_lock; /* 20 4 */
> unsigned int break_lock; /* 24 4 */
> } lock; /* 20 8 */
> }; /* size: 32, cachelines: 1 */
> /* padding: 4 */
> /* last cacheline: 32 bytes */
>
> #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
> unsigned int break_lock;
> #endif
>
> Disabling CONFIG_PREEMPT makes you regain your confidence in the
> quality of your tea:
PREEMPT ? what is this ? Is it suitable for my machines with hundred of
thousands of sockets ? :)
I hope you dont want to shrink struct sock for desktop users :)
BTW, your pahole tool is cool :)
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