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. v7->v8: The series failed on platforms with 64kB page size. Thus the following changes where made: - Patch 1: add the guard page to the stack memory and do not deduct it [Kevin, Stephan] - Patch 1: Submit the requested page size as a pointer so that qemu_alloc_stack can adjust the size according to system requirements and that the full size is usable to the caller. - Patch 6: reduced stack size to 60kB so that on systems with 4kB page size we still get 64kB allocations. v6->v7: - Patch 1: avoid multiple calls to sysconf and getpagesize [Richard] v5->v6: - Patch 1: added info that the guard page is deducted from stack memory to commit msg and headers [Stefan] - rebased to master v4->v5: - Patch 1: check if _SC_THREAD_STACK_MIN is defined - Patch 1: guard against sysconf(_SC_THREAD_STACK_MIN) returning -1 [Eric] 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 60kB configure | 19 +++++++++++ include/qemu/coroutine_int.h | 2 ++ include/sysemu/os-posix.h | 27 +++++++++++++++ util/coroutine-sigaltstack.c | 9 ++--- util/coroutine-ucontext.c | 11 +++--- util/coroutine-win32.c | 2 +- util/oslib-posix.c | 81 ++++++++++++++++++++++++++++++++++++++++++++ 7 files changed, 141 insertions(+), 10 deletions(-) -- 1.9.1