Messages in this thread | | | Date | Fri, 27 Feb 2009 12:33:33 +0100 | From | Nick Piggin <> | Subject | Re: [PATCH 20/20] Get rid of the concept of hot/cold page freeing |
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On Thu, Feb 26, 2009 at 12:30:45PM -0500, Christoph Lameter wrote: > On Thu, 26 Feb 2009, Mel Gorman wrote: > > > > I tried the general use of a pool of zeroed pages back in 2005. Zeroing > > > made sense only if the code allocating the page did not immediately touch > > > the cachelines of the page. > > > > Any feeling as to how often this was the case? > > Not often enough to justify the merging of my patches at the time. This > was publicly discussed on lkml: > > http://lkml.indiana.edu/hypermail/linux/kernel/0503.2/0482.html > > > Indeed, any gain if it existed would be avoiding zeroing the pages used > > by userspace. The cleanup would be reducing the amount of > > architecture-specific code. > > > > I reckon it's worth an investigate but there is still other lower-lying > > fruit. > > I hope we can get rid of various ugly elements of the quicklists if the > page allocator would offer some sort of support. I would think that the
Only if it provides significant advantages over existing quicklists or adds *no* extra overhead to the page allocator common cases. :)
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