Patchwork linux-user: map lower in address space

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Submitter Alexander Graf
Date Dec. 5, 2011, 11:44 p.m.
Message ID <1323128695-11292-1-git-send-email-agraf@suse.de>
Download mbox | patch
Permalink /patch/129478/
State New
Headers show

Comments

Alexander Graf - Dec. 5, 2011, 11:44 p.m.
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 <agraf@suse.de>
---
 linux-user/mmap.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

Patch

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
 #else
-# define TASK_UNMAPPED_BASE  0x40000000
+# define TASK_UNMAPPED_BASE  0x10000000
 #endif
 static abi_ulong mmap_next_start = TASK_UNMAPPED_BASE;