On Fri, 12 Mar 2021 11:38:55 -0600 Jim Newsome <jnews...@torproject.org> wrote:
> do_wait is an internal function used to implement waitpid, waitid, > wait4, etc. To handle the general case, it does an O(n) linear scan of > the thread group's children and tracees. > > This patch adds a special-case when waiting on a pid to skip these scans > and instead do an O(1) lookup. This improves performance when waiting on > a pid from a thread group with many children and/or tracees. Could we please see some performance testing results to permit us to evaluate the value of this change? Thanks.
