Re: [PATCH v6] add MAP_UNLOCKED mmap flag

[Gleb Natapov <gleb@redhat.com>]

On Tue, Jan 19, 2010 at 03:18:11PM +0200, Pekka Enberg wrote:
> On Tue, Jan 19, 2010 at 2:48 PM, Minchan Kim <minchan.kim@gmail.com> wrote:
> > Gleb. How about using MADV_SEQUENTIAL on guest memory?
> > It makes that pages of guest are moved into inactive reclaim list more
> > fast. It means it is likely to swap out faster than other pages if it
> > isn't hit during inactive list.
> 
> Yeah, something like that but we don't want the readahead. OTOH, it's
> not clear what Gleb's real problem is. Are the guest address spaces
> anonymous or file backed?
Anonymous.

>                           Which parts of the emulator are swapped out
> that are causing the problem?
I don't want anything that can be used during guest runtime to be
swapped out. And I run 2G guest in 512M container, so eventually
everything is swapped out :)

>                                Maybe it's a VM balancing issue that
> mlock papers over?
> 
There is no problem. I do measurements on how host swapping affects
guest and I don't want qemu code to be swapped out.

--
			Gleb.

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>