* Paolo Bonzini (pbonz...@redhat.com) wrote: > > > On 28/06/2016 11:01, Peter Lieven wrote: > > evaluation with the recently introduced maximum stack size monitoring > > revealed > > that the actual used stack size was never above 4kB so allocating 1MB stack > > for each coroutine is a lot of wasted memory. So reduce the stack size to > > 64kB which should still give enough head room. > > If we make the stack this much smaller, there is a non-zero chance of > smashing it. You must add a guard page if you do this (actually more > than one because QEMU will happily have stack frames as big as 16 KB). > The stack counts for RSS but it's not actually allocated memory, so why > does it matter?
I think I'd be interested in seeing the /proc/.../smaps before and after this change to see if anything is visible and if we can see the difference in rss etc. Dave > > Paolo -- Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
