Hi! > Linus, please consider pulling from > > master.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband.git > ummunotify > > This tree is also available from kernel.org mirrors at: > > git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband.git > ummunotify > > This will get "ummunotify," a new character device that allows a > userspace library to register for MMU notifications; this is > particularly useful for MPI implementions (message passing libraries > used in HPC) to be able to keep track of what wacky things consumers > do to their memory mappings. My colleague Jeff Squyres from the Open > MPI project posted a blog entry about why MPI wants this: > > http://blogs.cisco.com/ciscotalk/performance/comments/better_linux_memory_tracking/ > > His summary of ummunotify: > > "It???s elegant, doesn???t require strange linker tricks, and seems to > work in all cases. Yay!" > > This code went through several review iterations on lkml and was in > -mm and -next for quite a few weeks. Andrew is OK with merging it (I > think -- Andrew please correct me if I misunderstood you).
I don't remember seeing discussion of this on lkml. Yes it is in -next... Basically it allows app to 'trace itself'? ...with interesting mmap() interface, exporting int to userspace, hoping it behaves atomically...? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html