On Fri, 2016-08-19 at 10:43 -0700, Joe Perches wrote: > And this would definitely be faster if seq_has_overflowed() was > used somewhere in the iteration loop.
Adding a seq_has_overflowed() test seems unnecessary as the fs/seq_file.c traverse() static function already does a seq_has_overflowed(). And I get: $ t_mm (your allocate all vma program modified to show count) count: 65514 pid:2051 $ wc -c /proc/2051/smaps 39515615 /proc/2051/smaps smap vma output is a little more than 600 bytes per vma. I'll look around to see how best go use single_open_size assuming 768 bytes/vma rounded up to the next PAGE_SIZE.
