linux-kernel - RE: [PATCH RFC v3 1/6] cxl/trace: Remove uuid from event trace known events

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Date:   Mon, 6 Nov 2023 14:05:39 -0800
From:   Ira Weiny <ira.weiny@...el.com>
To:     Shiju Jose <shiju.jose@...wei.com>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Ira Weiny <ira.weiny@...el.com>
CC:     Dan Williams <dan.j.williams@...el.com>,
        Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>,
        Yazen Ghannam <yazen.ghannam@....com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Dave Jiang <dave.jiang@...el.com>,
        Alison Schofield <alison.schofield@...el.com>,
        "Vishal Verma" <vishal.l.verma@...el.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-cxl@...r.kernel.org" <linux-cxl@...r.kernel.org>
Subject: RE: [PATCH RFC v3 1/6] cxl/trace: Remove uuid from event trace known
 events

Shiju Jose wrote:
> 
> 
> >-----Original Message-----
> >From: Jonathan Cameron <jonathan.cameron@...wei.com>
> >Sent: 03 November 2023 14:28
> >To: Ira Weiny <ira.weiny@...el.com>
> >Cc: Dan Williams <dan.j.williams@...el.com>; Smita Koralahalli
> ><Smita.KoralahalliChannabasappa@....com>; Yazen Ghannam
> ><yazen.ghannam@....com>; Davidlohr Bueso <dave@...olabs.net>; Dave
> >Jiang <dave.jiang@...el.com>; Alison Schofield <alison.schofield@...el.com>;
> >Vishal Verma <vishal.l.verma@...el.com>; Ard Biesheuvel <ardb@...nel.org>;
> >linux-efi@...r.kernel.org; linux-kernel@...r.kernel.org; linux-
> >cxl@...r.kernel.org; Shiju Jose <shiju.jose@...wei.com>
> >Subject: Re: [PATCH RFC v3 1/6] cxl/trace: Remove uuid from event trace known
> >events
> >
> >On Wed, 01 Nov 2023 14:11:18 -0700
> >Ira Weiny <ira.weiny@...el.com> wrote:
> >
> >> The uuid printed in the well known events is redundant.  The uuid
> >> defines what the event was.
> >>
> >> Remove the uuid from the known events and only report it in the
> >> generic event as it remains informative there.
> >>
> >> Reviewed-by: Davidlohr Bueso <dave@...olabs.net>
> >> Reviewed-by: Dan Williams <dan.j.williams@...el.com>
> >> Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> >
> >Removing the print is fine, but look like this also removes the actual trace point
> >field.  That's userspace ABI.  Expanding it is fine, but taking fields away is more
> >problematic.
> >
> >Are we sure we don't break anyone?  Shiju, will rasdaemon be fine with this
> >change?
> 
> The field hdr_uuid is removed from the common CXL_EVT_TP_entry shared by the
> trace events cxl_generic_event, cxl_general_media, cxl_dram and cxl_memory_module .
> rasdaemon will break because of this while processing these trace events
> and also affects the corresponding error records in the SQLite data base. 
> Rasdaemon needs update to avoid this.
>  

Ok we can leave the uuid field in easy enough.

But does rasdaemon use the value of the field for anything?  In other
words does CPER record processing need to generate a proper UUID value?

Ira