Peter Zijlstra wrote:
On Tue, 2007-08-21 at 16:05 +1000, Dave Airlie wrote:
So you can see why some sort of uncached+writecombined page cache
would be useful, I could just allocate a bunch of pages at startup as
uncached+writecombined, and allocate pixmaps from them and when I
bind/free the pixmap I don't need the flush at all, now I'd really
like this to be part of the VM so that under memory pressure it can
just take the pages I've got in my cache back and after flushing turn
them back into cached pages, the other option is for the DRM to do
this on its own and penalise the whole system.
Can't you make these pages part of the regular VM by sticking them all
into an address_space.
And for this reclaim behaviour you'd only need to set PG_private and
have a_ops->releasepage() dtrt.
I'd just suggest Dave just registers a shrinker to start with.
You really want to be able to batch TLB flushes as well, which
->releasepage may not be so good at (you could add more machinery
behind the releasepage to build batches and so on, but anyway, a
shrinker might be the quickest way to get something working).
--
SUSE Labs, Novell Inc.
-
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]
