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[Qemu-devel] [PATCH] Allow setting qemu process name
From: |
Andi Kleen |
Subject: |
[Qemu-devel] [PATCH] Allow setting qemu process name |
Date: |
Wed, 1 Jul 2009 11:32:52 +0200 |
User-agent: |
Mutt/1.5.17 (2007-11-01) |
[this is a port of a old KVM userland patch I had; Avi back then suggested to
submit it to qemu]
Set the Linux process name to the name argument specified with "-name". I find
this useful to see which guests are taking CPU time in top.
This doesn't affect ps, which checks argv[0], but rewriting the
environment uses much more code, so I only used this simple way.
Signed-off-by: Andi Kleen <address@hidden>
diff --git a/vl.c b/vl.c
index 7b7489c..584c48e 100644
--- a/vl.c
+++ b/vl.c
@@ -68,6 +68,7 @@
#include <pty.h>
#include <malloc.h>
#include <linux/rtc.h>
+#include <sys/prctl.h>
/* For the benefit of older linux systems which don't supply it,
we use a local copy of hpet.h. */
@@ -526,6 +527,19 @@ void hw_error(const char *fmt, ...)
va_end(ap);
abort();
}
+
+static void set_proc_name(const char *prefix, const char *s)
+{
+#ifdef __linux__
+ char name[16];
+ if (!s)
+ return;
+ /* Could rewrite argv[0] too, but that's a bit more complicated.
+ This simple way is enough for `top'. */
+ snprintf(name, sizeof name, "%s-%.10s", prefix, s);
+ prctl(PR_SET_NAME, name);
+#endif
+}
/***************/
/* ballooning */
@@ -6008,11 +6022,15 @@ int main(int argc, char **argv, char **envp)
if (kvm_enabled()) {
int ret;
+ set_proc_name("kvm", qemu_name);
+
ret = kvm_init(smp_cpus);
if (ret < 0) {
fprintf(stderr, "failed to initialize KVM\n");
exit(1);
}
+ } else {
+ set_proc_name("qemu", qemu_name);
}
if (monitor_device) {
--
address@hidden -- Speaking for myself only.