Messages in this thread | | | Date | Thu, 24 Jun 2004 10:53:31 -0700 | From | William Lee Irwin III <> | Subject | Re: [discuss] Re: 32-bit dma allocations on 64-bit platforms |
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On Thu, Jun 24, 2004 at 07:39:27PM +0200, Andrea Arcangeli wrote: > I looked more into it and you can leave it turned off since it's not > going to work. > it's all in functions of z->pages_* and those are _global_ for all the > zones, and in turn they're absolutely meaningless. > the algorithm has nothing in common with lowmem_reverse_ratio, the > effect has a tinybit of similarity but the incremntal min thing is so > weak and so bad that it will either not help or it'll waste tons of > memory. Furthemore you cannot set a sysctl value that works for all > machines. The whole thing should be dropped and replaced with the fine > production quality lowmem_reserve_ratio in 2.4.26+ > (the only broken thing of lowmem_reserve_ratio is that it cannot be > tuned, not even at boottime, a recompile is needed, but that's fixable > to tune it at boot time, and in theory at runtime too, but the point is > that no dyanmic tuning is required with it) > Please focus on this code of 2.4:
There is mention of discrimination between pinned and unpinned allocations not being possible; I can arrange this for more comprehensive coverage if desired. Would you like this to be arranged, and if so, how would you like that to interact with the fallback heuristics?
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