Hello, On Thu, May 10, 2018 at 02:15:32PM +0200, Oleg Nesterov wrote: > > So avoid the problems by simply blocking cgroup migration over the > > entirety of exec. > > This patch, even if it was correct, will bring much more problems. > > If nothing else exec() is very slow. If it races with migration which needs > this sem for writing the new readers will be blocked. This means that clone(), > exit(), or another exec() will block too.
Agreed. I don't think it's a good idea to expand threadgroup coverage larger than it already is. I'd much prefer either working around the copy_string case specifically or just ignoring it. Thanks. -- tejun
