On Tuesday 29 November 2005 10:08, Blaisorblade wrote: > On Monday 28 November 2005 02:07, Rob Landley wrote: > > On Sunday 27 November 2005 12:31, Nix wrote: > > > > Did you catch Linus's long rant about how MAP_PRIVATE is deeply stupid > > and that Linux will never really implement it? > > What's that?
Looking it up, it turns out it was MAP_COPY he was against: http://www.uwsg.iu.edu/hypermail/linux/kernel/0110.0/0826.html So I was wrong there. > > And you can fsync and do stuff like journaling within a file. (Except > > with mmap it's msync.) > > > > No, just use the madvise(NO_SYNC). > > Which doesn't exist. Takes some of the fun out of it, yes. But as a recommendation in response to a similar "change everything" proposal, it seems like a more sane direction to me. > > Then tmpfs becomes completely > > irrelevant because any arbitrary file backed mapping can be treated as > > memory. (Not pinned, but still treated as shared memory.) > > > > I vaguely remember some discussion about this on linux-kernel, some time > > ago. I wonder how it came out? (2.6.15-rc2 mman.h doesn't show > > anything...) > > What I remember is MADV_TRUNCATE / MADV_FREE / and so on by Badary > Pulavarty - the equivalent of MADV_DONTNEED with additional truncation of > the tmpfs pages you have mmaped. > > Which is used for UML memory hotunplug patch from Jeff's. IIRC it's in -mm, > but won't be in 2.6.15 at this point. This is a vague recollection from 3-5 years ago. :) Rob -- Steve Ballmer: Innovation! Inigo Montoya: You keep using that word. I do not think it means what you think it means. ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
