qemu/Raise-soft-address-space-limit-to-hard-l.patch

From: =?UTF-8?q?Andreas=20F=C3=A4rber?= <afaerber@suse.de>
Date: Sun, 15 Jan 2012 19:53:49 +0100
Subject: Raise soft address space limit to hard limit
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For SLES we want users to be able to use large memory configurations
with KVM without fiddling with ulimit -Sv.

Signed-off-by: Andreas Färber <afaerber@suse.de>
[BR: add include for sys/resource.h]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 softmmu/vl.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/softmmu/vl.c b/softmmu/vl.c
index 620a1f1367e2b033bfec541619d3..527e1d91859b19351d397ef64930 100644
--- a/softmmu/vl.c
+++ b/softmmu/vl.c
@@ -40,6 +40,7 @@
 #include "sysemu/reset.h"
 #include "sysemu/runstate.h"
 #include "sysemu/runstate-action.h"
+#include <sys/resource.h>
 #include "sysemu/seccomp.h"
 #include "sysemu/tcg.h"
 #include "sysemu/xen.h"
@@ -2772,6 +2773,17 @@ void qemu_init(int argc, char **argv, char **envp)
     MachineClass *machine_class;
     bool userconfig = true;
     FILE *vmstate_dump_file = NULL;
+    struct rlimit rlimit_as;
+
+    /*
+     * Try to raise the soft address space limit.
+     * Default on SLES 11 SP2 is 80% of physical+swap memory.
+     */
+    getrlimit(RLIMIT_AS, &rlimit_as);
+    if (rlimit_as.rlim_cur < rlimit_as.rlim_max) {
+        rlimit_as.rlim_cur = rlimit_as.rlim_max;
+        setrlimit(RLIMIT_AS, &rlimit_as);
+    }
 
     qemu_add_opts(&qemu_drive_opts);
     qemu_add_drive_opts(&qemu_legacy_drive_opts);