On Tue 19-09-17 14:11:19, Florian Weimer wrote: > On 09/18/2017 07:11 PM, Mike Kravetz wrote: [...] > > I can drop this wording, but would still like to suggest memfd_create as > > the preferred method of creating duplicate mappings. It would be good if > > others on Cc: could comment as well. > > mremap seems to work with non-anonymous mappings, too:
only for shared mappings in fact. Because once we have CoW then mremap will not provide you with the same content as the original mapping. [...] > > Just curious, does glibc make use of this today? Or, is this just something > > that you think may be useful. > > To my knowledge, we do not use this today. But it certainly looks very > useful. What would be the usecase. I mean why don't you simply create a new mapping by a plain mmap when you have no guarantee about the same content? -- Michal Hocko SUSE Labs
