On Wed 06-10-21 11:18:31, Suren Baghdasaryan wrote: > On Wed, Oct 6, 2021 at 10:58 AM Pavel Machek <pavel@xxxxxx> wrote: [...] > > That "central facility" option can be as simple as "mkdir > > /somewhere/sanitized_id", using inode numbers for example. You don't > > really need IPC. > > Hmm, so the suggestion is to have some directory which contains files > representing IDs, each containing the string name of the associated > vma? Then let's say we are creating a new VMA and want to name it. We > would have to scan that directory, check all files and see if any of > them contain the name we want to reuse the same ID. I believe Pavel meant something as simple as $ YOUR_FILE=$YOUR_IDS_DIR/my_string_name $ touch $YOUR_FILE $ stat -c %i $YOUR_FILE YOUR_IDS_DIR can live on a tmpfs and you can even implement a policy on top of that (who can generate new ids, gurantee uniqness etc...). The above is certainly not for free of course but if you really need a system wide consistency when using names then you need some sort of central authority. How you implement that is not all that important but I do not think we want to handle that in the kernel. -- Michal Hocko SUSE Labs
