tail(1) assumes that mmap(2) works on works on regular files. mmap(2) on
the irregular regular files /proc/*/map returns success but doesn't work.
The first access to the mmapped memory usually causes the kernel to
printf messages like the following:
vnode_pager: *** WARNING *** stale FS getpages
No strategy for buffer at 0xf12828e8
: 0xf3877800: type VREG, usecount 4, writecount 0, refcount 0, flags (VOBJBUF)
tag VT_PROCFS, type 11, pid 591, mode 124, flags 0
: 0xf3877800: type VREG, usecount 4, writecount 0, refcount 0, flags (VOBJBUF)
tag VT_PROCFS, type 11, pid 591, mode 124, flags 0
vnode_pager_getpages: I/O read error
vm_fault: pager read error, pid 2023 (tail)
pid 2023 (tail), uid 15: exited on signal 11
Bruce
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