On Tue, Sep 05, 2017 at 10:05:00PM +0300, Alexey Dobriyan wrote: > From: Tatsiana Brouka <Tatsiana_Brouka@xxxxxxxx> > > Implement system call for bulk retrieveing of pids in binary form. > > Using /proc is slower than necessary: 3 syscalls + another 3 for each thread + > converting with atoi(). > > /proc may be not mounted especially in containers. Natural extension of > hidepid=2 efforts is to not mount /proc at all. > > It could be used by programs like ps, top or CRIU. Speed increase will > become more drastic once combined with bulk retrieval of process statistics. What could give a noticeable performance gain in a less ridiculous way is an interface like task_diag, see https://lkml.org/lkml/2016/4/11/924 . -- ldv
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