Hi On Tue, Jun 17, 2014 at 12:04 PM, Florian Weimer <fweimer@xxxxxxxxxx> wrote: > On 06/17/2014 12:01 PM, David Herrmann wrote: > >>> I don't think this is what potential users expect because mlock requires >>> capabilities which are not available to them. >>> >>> A couple of weeks ago, sealing was to be applied to anonymous shared >>> memory. >>> Has this changed? Why should *reading* it trigger OOM? >> >> The file might have holes, therefore, you'd have to allocate backing >> pages. This might hit a soft-limit and fail. To avoid this, use >> fallocate() to allocate pages prior to mmap() > > This does not work because the consuming side does not know how the > descriptor was set up if sealing does not imply that. The consuming side has to very seals via F_GET_SEALS. After that, it shall do a simple fallocate() on the whole file if it wants to go sure that all pages are allocated. Why shouldn't that be possible? Please elaborate. Thanks David -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>