On Mon, 9 Jul 2007, William Tambe wrote: > Hugh Dickins wrote: > > > > I've come right around to your original view, Stas, and William's: > > if that mmap creates such an object, then the expanding mremap really > > ought to be useful, and allow the underlying object to be expanded. > > The shared anonymous object is already anomalous: expanding it on > > fault makes it more consistent with its own nature, not less. > > ... > > Here's a patch against 2.6.22-rc7: would you, Stas, put your > > Signed-off-by into this, and accept authorship - although I'm > > sending this back to you, it's very much your idea, and only > > trivially modified from your three-year-old patch by me. If > > you're agreeable, I can then forward it or its shmem_zero_fault > > equivalent to Andrew when we see which way 2.6.23 is going. >... > Will this patch be added to stable versions of the linux kernel? > Please let me know.
I confess that the lukewarm response from Stas cooled my enthusiasm, and left me feeling that perhaps I'm an idiot to be adding such a feature so many years too late; and my old caution about the way a child could use up memory not freed on child's exit, unknown to parent, returned to haunt me. That could be documented for new usages, but I just don't know what usages are already out there, and fear I'd be introducing an exploit. It most certainly will not be added to a stable version of the linux kernel, if by that you mean 2.6.22.N or 2.6.21.N etc. Though it can be viewed as a bugfix, the patch as it stands seems in danger of introducing its own bug, and it's just too much of a feature to be suitable for a -stable release. But more probably you meant, will it be in 2.6.23 or 2.6.24? Sorry to be such a vacillatiing wimp, but I don't know. How well are you managing with the shm_open approach? Hugh - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
