Re: [PATCH][FAT] FAT dirent scan with hin take #3

[Machida, Hiroyuki]

Pekka Enberg wrote:
> On 8/31/05, Machida, Hiroyuki <machida@xxxxxxxxxxxxx> wrote:
>
> > +inline
> > +static int hint_index_body(const unsigned char *name, int name_len, int check_null)
> > +{
> > +       int i;
> > +       int val = 0;
> > +       unsigned char *p = (unsigned char *) name;
> > +       int id = current->pid;
> > +
> > +       for (i=0; i<name_len; i++) {
> > +               if (check_null && !*p) break;
> > +               val = ((val << 1) & 0xfe) | ((val & 0x80) ? 1 : 0);
> > +               val ^= *p;
> > +               p ++;
> > +       }
> > +       id = ((id >> 8) & 0xf) ^ (id & 0xf);
> > +       val = (val << 1) | (id & 1);
> > +       return val & (FAT_SCAN_NWAY-1);
>
>
> Couldn't you use jhash() from <linux/jhash.h> here?
>
>                                  Pekka
Thanks, I'll replace it with functions in jhash.h, then
check performance again.

--
Hiroyuki Machida		machida@xxxxxxxxxxxxx		

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/