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Allow setting qemu process name v2 

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.

v2: Use separate process= argument, no prefixes.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Andi Kleen 2009-07-02 09:34:17 +02:00 committed by Anthony Liguori
parent e3fc14c3a1
commit 1889465a1c
2 changed files with 31 additions and 2 deletions
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4
qemu-options.hx
View File

@ -363,12 +363,14 @@ Network adapter that supports CDC ethernet and RNDIS protocols.
ETEXI
DEF("name", HAS_ARG, QEMU_OPTION_name,
"-name string set the name of the guest\n")
"-name string1[,process=string2] set the name of the guest\n"
" string1 sets the window title and string2 the process name (on Linux)\n")
STEXI
@item -name @var{name}
Sets the @var{name} of the guest.
This name will be displayed in the SDL window caption.
The @var{name} will also be used for the VNC server.
Also optionally set the top visible process name in Linux.
ETEXI
DEF("uuid", HAS_ARG, QEMU_OPTION_uuid,

29
vl.c
View File

@ -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. */
@ -300,6 +301,20 @@ void hw_error(const char *fmt, ...)
va_end(ap);
abort();
}
static void set_proc_name(const char *s)
{
#ifdef __linux__
char name[16];
if (!s)
return;
name[sizeof(name) - 1] = 0;
strncpy(name, s, sizeof(name));
/* Could rewrite argv[0] too, but that's a bit more complicated.
This simple way is enough for `top'. */
prctl(PR_SET_NAME, name);
#endif
}
/***************/
/* ballooning */
@ -5416,7 +5431,19 @@ int main(int argc, char **argv, char **envp)
break;
#endif
case QEMU_OPTION_name:
qemu_name = optarg;
qemu_name = qemu_strdup(optarg);
{
char *p = strchr(qemu_name, ',');
if (p != NULL) {
*p++ = 0;
if (strncmp(p, "process=", 8)) {
fprintf(stderr, "Unknown subargument %s to -name", p);
exit(1);
}
p += 8;
set_proc_name(p);
}
}
break;
#if defined(TARGET_SPARC) || defined(TARGET_PPC)
case QEMU_OPTION_prom_env: