On 03/09, Jim Newsome 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. > > Signed-off-by: James Newsome <[email protected]>
Reviewed-by: Oleg Nesterov <[email protected]>
