From: Tzvetomir Stoyanov <tz.stoyanov@gmail.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Linux Trace Devel <linux-trace-devel@vger.kernel.org>
Subject: Re: [PATCH v3 2/2] trace-cmd: Trace timesync to find pids that map vCPUs
Date: Fri, 14 May 2021 16:38:29 +0300 [thread overview]
Message-ID: <CAPpZLN6cBt6aqL1QP9KxC1e8DqB8DWTVeT=5weF6guOvmdM7vQ@mail.gmail.com> (raw)
In-Reply-To: <20210514091205.6b269474@gandalf.local.home>
On Fri, May 14, 2021, 16:12 Steven Rostedt <rostedt@goodmis.org> wrote:
>
> On Fri, 14 May 2021 07:10:51 +0300
> Tzvetomir Stoyanov <tz.stoyanov@gmail.com> wrote:
>
> > > @@ -3250,10 +3282,18 @@ static char *parse_guest_name(char *gname, int *cid, int *port)
> > > } else if (is_digits(gname))
> > > *cid = atoi(gname);
> > >
> > > - read_qemu_guests();
> > > + if (*cid < 0)
> > > + read_qemu_guests();
> > > +
> > > + if (*cid < 0)
> > > + return NULL;
> >
> > This check is not needed. If cid is not part of the string, let
> > read_qemu_guests() to try discover the VMs, instead of returning NULL.
>
> I'm confused. That's basically what the above does.
>
> *cid = -1;
>
> if (<cid is in name>) {
> *cid = look_for_cid_via_tracing();
> }
>
> if (*cid < -1)
> read_qemu_guests();
>
> That is, if the cid isn't part of the name, then it will call
> read_qemu_guests().
>
> The second check is in case the read_qemu_guests() fails to find the cid
> either.
>
> What am I missing?
cid is not updated between both checks, it always fails - even though
read_qemu_guests() may succeed to find the VM with that name.
>
> -- Steve
next prev parent reply other threads:[~2021-05-14 13:38 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-13 20:43 [PATCH v3 0/2] trace-cmd: Use vsock tracing to find cids and threads Steven Rostedt
2021-05-13 20:43 ` [PATCH v3 1/2] trace-cmd: Find PID of host-guest task from tracing vsock connection Steven Rostedt
2021-05-13 20:43 ` [PATCH v3 2/2] trace-cmd: Trace timesync to find pids that map vCPUs Steven Rostedt
2021-05-14 4:10 ` Tzvetomir Stoyanov
2021-05-14 13:12 ` Steven Rostedt
2021-05-14 13:38 ` Tzvetomir Stoyanov [this message]
2021-05-14 14:00 ` Steven Rostedt
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAPpZLN6cBt6aqL1QP9KxC1e8DqB8DWTVeT=5weF6guOvmdM7vQ@mail.gmail.com' \
--to=tz.stoyanov@gmail.com \
--cc=linux-trace-devel@vger.kernel.org \
--cc=rostedt@goodmis.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).