On Wed, Apr 22, 2009 at 11:13:44AM -0700, David Daney wrote: > David VomLehn wrote: ... >> Only one comment, which I would not want to hold up acceptance: >> based on some numbers sent out recently, it looks like the kernel is >> experiencing some performance issues with exec() and I think this change will >> make it slightly slower. You could avoid this by deferring installation of >> the trampoline to the first use of a system call that registers a signal >> handler. > > I should try to measure this too. Although this is what x86 et al. do. > It is by far much simpler and less prone to bugs that trying to hook > into the system calls. After an executable has had the chance to start > additional threads and establish arbitrary mappings things get > complicated. I suspect the overhead is quite small and agree that hooking into the system calls a bit risky. This might be better done as a phase two, if at all. > David Daney David VomLehn
