From: Tejun H. <tj...@ke...> - 2009-07-08 23:16:12
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Hello, Miklos. Miklos Szeredi wrote: > On Sat, 04 Jul 2009, Tejun Heo wrote: >>> Afaics sound drivers now map the dma memory with remap_pfn_range(). >>> Similary we could allocate a chunk of non-swapabble kernel memory on >>> request from the userspace server and map its pages using this trick >>> to both the server's and the client's address space. >>> >>> This is still sort of OSSP specific, I don't see clearly how it could >>> be made more generic. >> Using non-swappable memory would be fine for most device emulations >> but mapping large amount of pages would be problematic. Hmmm... this >> is difficult. It's a compromise among flexibility, scalability and >> code complexity. > > What's the difficulty? The desire to avoid pinning all the mapped pages. :-) > Allocating pages, giving them an ID and mapping them into various page > tables seems simple in contrast to trying to make a tmpfs file be a > fuse file at the same time, which the VM is really not prepared for. If pinning all the pages are okay, the above should work fine. Thanks. -- tejun |