On 2012/10/19 8:59, Tejun Heo wrote: >>From c8b27924a8b6fd74066088f1cf07c256bbc6ed74 Mon Sep 17 00:00:00 2001 > From: Tejun Heo <tj@xxxxxxxxxx> > Date: Thu, 18 Oct 2012 17:52:07 -0700 > > This reverts commit 7e381b0eb1e1a9805c37335562e8dc02e7d7848c. > > The commit incorrectly assumed that fork path always performed > threadgroup_change_begin/end() and depended on that for > synchronization against task exit and cgroup migration paths instead > of explicitly grabbing task_lock(). > > threadgroup_change is not locked when forking a new process (as > opposed to a new thread in the same process) and even if it were it > wouldn't be effective as different processes use different threadgroup > locks. > > Revert the incorrect optimization. > > Signed-off-by: Tejun Heo <tj@xxxxxxxxxx> > LKML-Reference: <20121008020000.GB2575@localhost> > Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx> > Cc: Li Zefan <lizefan@xxxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx Acked-by: Li Zefan <lizefan@xxxxxxxxxx> _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/containers
