Re: [Qemu-devel] [PATCH V5 0/6] coroutine: mmap stack memory and stack size

[Peter Lieven <pl@kamp.de>]

Am 12.07.2016 um 18:23 schrieb Peter Lieven:
> 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.
>
> 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 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           | 83 ++++++++++++++++++++++++++++++++++++++++++++
>  7 files changed, 135 insertions(+), 10 deletions(-)
>

Ping.

Peter