Re: [rfc][patch] mm: madvise(WILLNEED) for anonymous memory

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Thu, 2007-12-20 at 11:11 -0600, Matt Mackall wrote:
> On Thu, Dec 20, 2007 at 05:53:41PM +0100, Peter Zijlstra wrote:
> > 
> > On Thu, 2007-12-20 at 15:26 +0000, Hugh Dickins wrote:
> > 
> > > The asynch code: perhaps not worth doing for MADV_WILLNEED alone,
> > > but might prove useful for more general use when swapping in.
> > > Not really the same as Con's swap prefetch, but worth looking
> > > at that for reference.  But I guess this becomes a much bigger
> > > issue than you were intending to get into here.
> > 
> > heh, yeah, got somewhat more complex that I'd hoped for.
> > 
> > last patch for today (not even compile tested), will do a proper patch
> > and test it tomorrow.
> > 
> > ---
> > A best effort MADV_WILLNEED implementation for anonymous memory.
> > 
> > It adds a batch method to the page table walk routines so we can
> > copy a few ptes while holding the kmap, which makes it possible to
> > allocate the backing pages using GFP_KERNEL.
> 
> Yuck. We actually need to just fix the atomic kmap issue in the
> existing pagemap code rather than add a new method, I think.
> 
> If performance of map/unmap is too slow at a granularity of 1, we can
> add some internal batching in the CONFIG_HIGHPTE case.

OK, sounds like a much better idea indeed. Will implement that.

--
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]
  Powered by Linux