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>
---
 vl.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/vl.c b/vl.c
index b426b3213461210565bd1db15a0c..2b864f7dbe8b60ace40fa3258a37 100644
--- a/vl.c
+++ b/vl.c
@@ -30,6 +30,7 @@
 #include "qemu/cutils.h"
 #include "qemu/help_option.h"
 #include "qemu/uuid.h"
+#include <sys/resource.h>
 #include "sysemu/seccomp.h"
 #include "sysemu/tcg.h"
 
@@ -2889,6 +2890,7 @@ int main(int argc, char **argv, char **envp)
     bool list_data_dirs = false;
     char *dir, **dirs;
     BlockdevOptionsQueue bdo_queue = QSIMPLEQ_HEAD_INITIALIZER(bdo_queue);
+    struct rlimit rlimit_as;
 
     os_set_line_buffering();
 
@@ -2900,6 +2902,16 @@ int main(int argc, char **argv, char **envp)
 
     qemu_mutex_lock_iothread();
 
+    /*
+     * 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);
+    }
+
     atexit(qemu_run_exit_notifiers);
     qemu_init_exec_dir(argv[0]);