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[Qemu-devel] [PATCH V3 0/6] coroutine: mmap stack memory and stack size


From: Peter Lieven
Subject: [Qemu-devel] [PATCH V3 0/6] coroutine: mmap stack memory and stack size
Date: Thu, 7 Jul 2016 13:37:20 +0200

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.

v1->v2:
 - 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           | 76 ++++++++++++++++++++++++++++++++++++++++++++
 7 files changed, 128 insertions(+), 10 deletions(-)

-- 
1.9.1




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