On Sat, Jun 18, 2016 at 12:31 AM, Andres Freund <and...@anarazel.de> wrote: > On 2016-06-18 00:23:14 +0600, Aleksey Demakov wrote: >> Finally, it's possible to repeatedly mmap >> and munmap on portions of a contiguous address space providing >> a given addr argument for both of them. The last option might, of >> course, is susceptible to hijacking this portion of the address by an >> inadvertent caller of mmap with NULL addr argument. But probably >> this could be avoided by imposing a disciplined use of mmap in >> postgresql core and extensions. > > I don't think that's particularly realistic. malloc() uses mmap(NULL) > internally. And you can't portably mmap non-file backed memory from > different processes; you need something like tmpfs backed / posix shared > memory / for it. On linux you can do stuff like madvise(MADV_FREE), > which kinda helps.
Oops. Agreed. -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
