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[Qemu-devel] [PULL 18/18] coroutine: reduce stack size to 60kB


From: Kevin Wolf
Subject: [Qemu-devel] [PULL 18/18] coroutine: reduce stack size to 60kB
Date: Tue, 27 Sep 2016 15:54:01 +0200

From: Peter Lieven <address@hidden>

evaluation with the recently introduced maximum stack usage 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
60kB which should still give enough head room. The guard page added
in qemu_alloc_stack will catch a potential stack overflow introduced
by this commit. The 60kB + guard page will result in an allocation of
64kB per coroutine on systems where a page is 4kB.

Signed-off-by: Peter Lieven <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>
---
 include/qemu/coroutine_int.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/qemu/coroutine_int.h b/include/qemu/coroutine_int.h
index 14d4f1d..be14260 100644
--- a/include/qemu/coroutine_int.h
+++ b/include/qemu/coroutine_int.h
@@ -28,7 +28,7 @@
 #include "qemu/queue.h"
 #include "qemu/coroutine.h"
 
-#define COROUTINE_STACK_SIZE (1 << 20)
+#define COROUTINE_STACK_SIZE 61440
 
 typedef enum {
     COROUTINE_YIELD = 1,
-- 
1.8.3.1




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