I decided to split this from the rest of the Qemu RSS usage series as it contains the more or less non contentious patches.
I omitted the MAP_GROWSDOWN flag in mmap as we are not 100% sure which side effects it has. I kept the guard page which is now nicely makes the stacks visible in smaps. The old version of the relevent patch lacked the MAP_FIXED flag in the second call to mmap. The last patch which reduces the stack size of coroutines to 64kB may be omitted if its found to risky. v3->v4: - Patch 1: add a static function to adjust the stack size [Richard] - Patch 1: round up the stack size to multiple of the pagesize. v2->v3: - Patch 1,6: adjusted commit message to mention the guard page [Markus] v1->v2: - Patch 1: added an architecture dependend guard page [Richard] - Patch 1: avoid stacks smaller than _SC_THREAD_STACK_MIN [Richard] - Patch 1: use mmap+mprotect instead of mmap+mmap [Richard] - Patch 5: u_int32_t -> uint32_t [Richard] - Patch 5: only available if stack grows down Peter Lieven (6): oslib-posix: add helpers for stack alloc and free coroutine: add a macro for the coroutine stack size coroutine-ucontext: use helper for allocating stack memory coroutine-sigaltstack: use helper for allocating stack memory oslib-posix: add a configure switch to debug stack usage coroutine: reduce stack size to 64kB configure | 19 +++++++++++ include/qemu/coroutine_int.h | 2 ++ include/sysemu/os-posix.h | 23 +++++++++++++ util/coroutine-sigaltstack.c | 7 ++-- util/coroutine-ucontext.c | 9 +++-- util/coroutine-win32.c | 2 +- util/oslib-posix.c | 81 ++++++++++++++++++++++++++++++++++++++++++++ 7 files changed, 133 insertions(+), 10 deletions(-) -- 1.9.1
