On Tue, 2011-08-09 at 17:56 +0300, Pekka Enberg wrote:
> On Tue, Aug 9, 2011 at 5:53 PM, Ingo Molnar <mingo@xxxxxxx> wrote:
> >
> > * Sasha Levin <levinsasha928@xxxxxxxxx> wrote:
> >
> >> This patch changes './kvm list' to retrieve process name from
> >> '/proc/<pid>/stat' instead of '/proc/<pid>/comm' as it appears the latter
> >> does not exist by default on several systems.
> >>
> >> Reported-by: pradeep <psuriset@xxxxxxxxxxxxxxxxxx>
> >> Signed-off-by: Sasha Levin <levinsasha928@xxxxxxxxx>
> >> ---
> >> tools/kvm/builtin-list.c | 21 ++++++++++++++-------
> >> 1 files changed, 14 insertions(+), 7 deletions(-)
> >>
> >> diff --git a/tools/kvm/builtin-list.c b/tools/kvm/builtin-list.c
> >> index 2d37ecb..89a0465 100644
> >> --- a/tools/kvm/builtin-list.c
> >> +++ b/tools/kvm/builtin-list.c
> >> @@ -13,25 +13,32 @@
> >> static void print_guest(const char *name, int pid)
> >> {
> >> char proc_name[PATH_MAX];
> >> - char comm[sizeof(PROCESS_NAME)];
> >> - int fd;
> >> + char *comm = NULL;
> >> + FILE *fd;
> >>
> >> - sprintf(proc_name, "/proc/%d/comm", pid);
> >> - fd = open(proc_name, O_RDONLY);
> >> - if (fd <= 0)
> >> + sprintf(proc_name, "/proc/%d/stat", pid);
> >> + fd = fopen(proc_name, "r");
> >> + if (fd == NULL)
> >> goto cleanup;
> >
> > No, instead we should fall back to 'stat' if the 'comm' access fails.
> > The 'stat' field contains a lot more data and is thus slower - while
> > 'comm' only outputs the comm.
>
> Doh. I already merged the patch. Sasha, can you please send an
> incremental one to fix it up?
Does it matter when running './kvm list'? The speed difference isn't
really noticeable and it's not something that runs all the time.
--
Sasha.
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