Hi Andrew, What are your thoughts about inclusion of Mel's allocator work on -mm ?
On Wed, Feb 02, 2005 at 12:31:36AM +0000, Mel Gorman wrote: > On Tue, 1 Feb 2005, Christoph Lameter wrote: > > > On Tue, 1 Feb 2005, Mel Gorman wrote: > > > > > > Would it not be better to zero the global 2^MAX_ORDER pages by the scrub > > > > daemon and have a global zeroed page list? That way you may avoid > > > > zeroing > > > > when splitting pages? > > > > > > > > > > Maybe, but right now when there are no 2^MAX_ORDER pages, the scrub daemon > > > is going to be doing nothing which is why I think it needs to look at the > > > free pages of lower orders. > > > > > > That is solveable though in one of two ways. One, the scrub daemon can > > > zero pages from the global list and then add them to the USERZERO pool. It > > > has the advantage of requiring no more memory and is simple. The second is > > > to create a second global list. However, I think it only makes sense to > > > have this as part of the scrub daemon patch (I can write it if thats a > > > problem) rather than a standalone patch from me. > > > > Approach one is fine and I will do an update the remaining prezero patches > > to do just that. > > There is another problem with approach one. Assuming all 2^MAX_ORDER pages > have been zeroed and in USERZERO pool and there are no other free pages, > an allocation for the USERRCLM pool would search all the other pools > before finding the zerod pages. This could really slow things up but it is > not a problem approach two suffers from. > > > When will your patches be in Linus tree? ;-) > > > > Your guess is as good as mine :) . I am fairly sure the allocator is > somewhere in Andrew's list of patches to look at to consider for inclusion > into -mm so I suppose it'll get a spin in that tree when he feels it's > ready. - 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/