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[Qemu-devel] [PATCH] add MADV_DONTFORK to guest physical memory
From: |
Andrea Arcangeli |
Subject: |
[Qemu-devel] [PATCH] add MADV_DONTFORK to guest physical memory |
Date: |
Wed, 15 Sep 2010 19:08:24 +0200 |
From: Andrea Arcangeli <address@hidden>
All allocated guest physical memory shall be marked MADV_DONTFORK, otherwise
fork will fail because of accounting issues preventing migration or netdev_add
when the guest allocated more than half of host physical memory.
Signed-off-by: Andrea Arcangeli <address@hidden>
---
diff --git a/exec.c b/exec.c
index 380dab5..e2bdf19 100644
--- a/exec.c
+++ b/exec.c
@@ -2861,6 +2861,9 @@ ram_addr_t qemu_ram_alloc_from_ptr(DeviceState *dev,
const char *name,
#ifdef MADV_MERGEABLE
madvise(new_block->host, size, MADV_MERGEABLE);
#endif
+#ifdef MADV_DONTFORK
+ madvise(new_block->host, size, MADV_DONTFORK);
+#endif
}
}
- [Qemu-devel] [PATCH] add MADV_DONTFORK to guest physical memory,
Andrea Arcangeli <=