For some reason, on 32-bit x86 the mmap_start address is very close to the
beginning of the stack. Because of this, benchmarks like gzip that
allocate 64MB using mmap fail (while giving a soewhat obscure "memory
already mapped" pagetable error).
This patch arbitrarily moves the value down some, the value picked
probably isn't a good one.
diff -r 1b22ddf9266a src/arch/x86/process.cc
--- a/src/arch/x86/process.cc Mon Sep 21 23:04:31 2009 -0400
+++ b/src/arch/x86/process.cc Mon Sep 21 23:05:57 2009 -0400
@@ -184,7 +184,7 @@
// Set up region for mmaps. This was determined empirically and may not
// always be correct.
- mmap_start = mmap_end = (Addr)0xf7ffd000ULL;
+ mmap_start = mmap_end = (Addr)0xd7ffd000ULL;
}
SyscallDesc*
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