Messages in this thread | | | From | Perry Harrington <> | Subject | Re: Virtual memory stuff and Reiserfs | Date | Thu, 5 Mar 1998 17:39:06 -0800 (PST) |
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> > On Thu, 5 Mar 1998, Hans Reiser wrote: > > > There is a difference between a 4G file limit and a 4G mmap limit. > > > > The 4G mmap limit is an inherent mm issue, and nothing I do can fix it. > > Or am I wrong? > > In the struct_page there's a off_t page->offset member > to indicate the file offset _from the start of the file_ > when mmap()ing a file. > This means that everything over the 2g mark can't > be mmap()ed... > If you want to support larger files, you'd also want a > trick to mmap them (maybe two offset members, so you can > shift the 4g 'window' over the file?)
The 386 (at least) is capable of addressing 64TB of virtual memory, isn't mmap implemented as a demand page loading of VM??? That's how I'd implement it.
> > > What are you doing that isn't already size increased in 2.1? > > We recently shrunk the struct_page. Kswapd is getting > more efficient. Euhm... > > Rik. > +-----------------------------+------------------------------+ > | For Linux mm-patches, go to | "I'm busy managing memory.." | > | my homepage (via LinuxHQ). | H.H.vanRiel@fys.ruu.nl | > | ...submissions welcome... | http://www.fys.ruu.nl/~riel/ | > +-----------------------------+------------------------------+ > > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.rutgers.edu >
-- Perry Harrington Linux rules all OSes. APSoft () email: perry@apsoft.com Think Blue. /\
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