Re: [Qemu-devel] [PATCH] Allow setting qemu process name

["Todd T. Fries" <todd@fries.net>]

Penned by Andi Kleen on 20090701 11:32.52, we have:
| 
| [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 <ak@linux.intel.com>
| 
| 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);
#elif defined(__OpenBSD__)
    if (!s)
        setproctitle("%s-%.10s", prefix, s);
| +#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) {
| -- 
| ak@linux.intel.com -- Speaking for myself only.
| 

-- 
Todd Fries .. todd@fries.net

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