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Date: Thu, 09 Jul 2009 08:14:50 +0900 From: Tejun Heo <tj@...nel.org> To: Miklos Szeredi <miklos@...redi.hu> CC: linux-kernel@...r.kernel.org, fuse-devel@...ts.sourceforge.net, akpm@...ux-foundation.org, npiggin@...e.de Subject: Re: [PATCH 4/4] FUSE: implement direct mmap 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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