bigfile/ram_shmfs: Warn users explicitly if fallocate() is not supported
Currently wendelin.core does not work on e.g. Debian 7, because that distro has too old kernel without support for fallocate on tmpfs. But the diagnostics of failure is not clear and looks like just being out of memory: bigfile/tests/../virtmem.c:845 OOM BUG! what happens in fact is that - virtmem tries to allocate a page -> calls shmfs_alloc_page(), - fallocate() fails with "operation not supported" error code - virtmem sees this as page allocation failure, - tries to reclaim pages, - but there are no allocated pages at all -> OOM Detect whether fallocate() error is operational error, or simply "fallocate not supported" and if latter, report to user. Now it looks like: bigfile/tests/../ram_shmfs.c:129 shmfs_alloc_page WARN: fallocate() not supported bigfile/tests/../virtmem.c:845 OOM BUG! /cc @Tyagov
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