Re: [Xen-devel] [PATCH 01/35] libxl: add LIBXL_LOGD_* and LOG*D function families.

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Thu, Nov 17, 2016 at 05:01:08PM +0100, Cedric Bosdonnat wrote:
> On Thu, 2016-11-17 at 14:41 +0000, Wei Liu wrote:
> > On Tue, Nov 15, 2016 at 11:18:39AM +0100, Cédric Bosdonnat wrote:
> > > From: Cédric Bosdonnat <cedric.bosdonnat@xxxxxxx>
> > > 
> > > These functions should be used to log messages when the domain
> > > id is known. libxl__log will now prepend the log message by
> > > "Domain %PRIu32:" if the domain id is a valid one.
> > > 
> > > This aims at helping consumers filter logs on domain IDs.
> > > 
> > > Signed-off-by: Cédric Bosdonnat <cbosdonnat@xxxxxxxx>
> > > ---
> > >  tools/libxl/libxl_event.c    |  6 +++---
> > >  tools/libxl/libxl_internal.c | 16 ++++++++++------
> > >  tools/libxl/libxl_internal.h | 38 +++++++++++++++++++++++++++++++-------
> > >  3 files changed, 44 insertions(+), 16 deletions(-)
> > > 
> > > diff --git a/tools/libxl/libxl_event.c b/tools/libxl/libxl_event.c
> > > index 02b39e6..fc9bdc9 100644
> > > --- a/tools/libxl/libxl_event.c
> > > +++ b/tools/libxl/libxl_event.c
> > > @@ -1362,7 +1362,7 @@ void libxl__event_disaster(libxl__egc *egc, const 
> > > char *msg, int errnoval,
> > >  {
> > >      EGC_GC;
> > >  
> > > -    libxl__log(CTX, XTL_CRITICAL, errnoval, file, line, func,
> > > +    libxl__log(CTX, XTL_CRITICAL, errnoval, file, line, func, 
> > > INVALID_DOMID,
> > >                 "DISASTER in event loop: %s%s%s%s",
> > >                 msg,
> > >                 type ? " (relates to event type " : "",
> > > @@ -1943,7 +1943,7 @@ libxl__ao *libxl__ao_create(libxl_ctx *ctx, 
> > > uint32_t domid,
> > >          ao->poller = libxl__poller_get(&ao->gc);
> > >          if (!ao->poller) goto out;
> > >      }
> > > -    libxl__log(ctx,XTL_DEBUG,-1,file,line,func,
> > > +    libxl__log(ctx,XTL_DEBUG,-1,file,line,func,domid,
> > >                 "ao %p: create: how=%p callback=%p poller=%p",
> > >                 ao, how, ao->how.callback, ao->poller);
> > >  
> > > @@ -1968,7 +1968,7 @@ int libxl__ao_inprogress(libxl__ao *ao,
> > >      assert(ao->in_initiator);
> > >      ao->constructing = 0;
> > >  
> > > -    libxl__log(CTX,XTL_DEBUG,-1,file,line,func,
> > > +    libxl__log(CTX,XTL_DEBUG,-1,file,line,func,INVALID_DOMID,
> > 
> > You should be able to use ao->domid here, right?
> 
> Oh indeed. I discovered this one after writing this patch and forgot
> about it here. Could it be possible that ao->domid is not the publicly
> known domain id?

I think it is the publicly known domain id -- it was initialised in
libxl__ao_create which got domid from caller.

Wei.

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