On Tue, May 02 2006, Oleg Nesterov wrote:
> On 05/01, Jens Axboe wrote:
> >
> > > If readahead doesn't work, SPLICE_F_MOVE is problematic too.
> > > add_to_page_cache_lru()->lru_cache_add() first increments
> > > page->count and adds this page to lru_add_pvecs. This means
> > > page_cache_pipe_buf_steal()->remove_mapping() will probably
> > > fail.
> >
> > Because of the temporarily elevated page count?
>
> Yes.
>
> On the other hand, if readahead doesn't work we already have a
> bigger problem, and SPLICE_F_MOVE is not garanteed, so I think
> this is very minor.
Yes, clearly readahead has to work as expected. I haven't noticed any
problems, even on half cached workloads. With your handle_ra_miss()
addition and possibly killing the redundant !offset || nr_pages check,
it should be fine.
--
Jens Axboe
-
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]
