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[Qemu-devel] [PATCH] linux-user: map lower in address space

From: Alexander Graf
Subject: [Qemu-devel] [PATCH] linux-user: map lower in address space
Date: Tue, 6 Dec 2011 00:44:55 +0100

While trying to compile Java I can into situations where there was simply
no virtual address space left for a 32-bit guest to take. For example when
Java tried to allocate 1GB of heap.

Part of the problem is that we're starting to map things at 0x40000000.
This is a bit high. Taking that number down would give us a lot of free
virtual address space which means we'd be able to squeeze more stuff in.

Signed-off-by: Alexander Graf <address@hidden>
 linux-user/mmap.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/linux-user/mmap.c b/linux-user/mmap.c
index 7d846f3..8453c0d 100644
--- a/linux-user/mmap.c
+++ b/linux-user/mmap.c
@@ -226,7 +226,7 @@ static int mmap_frag(abi_ulong real_start,
 /* Cygwin doesn't have a whole lot of address space.  */
 # define TASK_UNMAPPED_BASE  0x18000000
-# define TASK_UNMAPPED_BASE  0x40000000
+# define TASK_UNMAPPED_BASE  0x10000000
 static abi_ulong mmap_next_start = TASK_UNMAPPED_BASE;

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