On Sat, 7 Apr 2007, Andrew Morton wrote:
> > I just tried the approach that we discussed earlier and it was not
> > nice either.
>
> We've discussed at least three approaches, so we don't know to what you refer.
Thats the approach of checking two flags at the same time. In that case
the compiler will generate and "and-immediate" and then a
"compare-immediate" one branch but .... Yuck.
> Because I don't expect there will be much efficiency difference between the
> above and the use of another page flag.
Then we end up with all these small efficiency differences in all
the code paths. I'd rather go for optimal performance in a frequently used
construct like this.
This check is not rare. It is done on every SLAB free and on every
get_page() and put_page(). Lets do the page flag.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
