On Wed, Mar 10, 2021 at 11:31:12AM -0500, Steven Rostedt wrote:
> On Wed, 10 Mar 2021 17:03:40 +0800
> Tony Lu wrote:
>
> > I use pahole to read vmlinux.o directly with defconfig and
> > CONFIG_DEBUG_INFO enabled, the result shows 22 structs prefixed with
> > trace_event_raw_ that have at least o
On Wed, 10 Mar 2021 17:03:40 +0800
Tony Lu wrote:
> On Tue, Mar 09, 2021 at 12:40:11PM -0500, Steven Rostedt wrote:
> > The above shows 10 bytes wasted for this event.
> >
>
> I use pahole to read vmlinux.o directly with defconfig and
> CONFIG_DEBUG_INFO enabled, the result shows 22 structs
On Wed, 10 Mar 2021 17:03:40 +0800
Tony Lu wrote:
> I use pahole to read vmlinux.o directly with defconfig and
> CONFIG_DEBUG_INFO enabled, the result shows 22 structs prefixed with
> trace_event_raw_ that have at least one hole.
I was thinking of pahole too ;-)
But the information can also be
On Wed, Mar 10, 2021 at 09:22:34AM +, Lorenz Bauer wrote:
> On Tue, 9 Mar 2021 at 20:12, Eric Dumazet wrote:
> >
> > On 3/9/21 5:43 AM, Tony Lu wrote:
> > > There are lots of net namespaces on the host runs containers like k8s.
> > > It is very common to see the same interface names among diff
On Tue, Mar 09, 2021 at 09:12:45PM +0100, Eric Dumazet wrote:
>
>
> On 3/9/21 5:43 AM, Tony Lu wrote:
> > There are lots of net namespaces on the host runs containers like k8s.
> > It is very common to see the same interface names among different net
> > namespaces, such as eth0. It is not possib
On Tue, 9 Mar 2021 at 20:12, Eric Dumazet wrote:
>
> On 3/9/21 5:43 AM, Tony Lu wrote:
> > There are lots of net namespaces on the host runs containers like k8s.
> > It is very common to see the same interface names among different net
> > namespaces, such as eth0. It is not possible to distinguis
On Tue, Mar 09, 2021 at 12:40:11PM -0500, Steven Rostedt wrote:
> On Tue, 9 Mar 2021 12:43:50 +0800
> Tony Lu wrote:
>
> > There are lots of net namespaces on the host runs containers like k8s.
> > It is very common to see the same interface names among different net
> > namespaces, such as eth0
On Tue, Mar 9, 2021 at 12:37 PM Steven Rostedt wrote:
>
> The size of the fields and order changes all the time in various events. I
> recommend doing so *all the time*. If you upgrade a kernel, then all the bpf
> programs you have for that kernel should also be updated. You can't rely on
> fields
On Tue, 9 Mar 2021 13:17:23 -0700
David Ahern wrote:
> On 3/9/21 1:02 PM, Steven Rostedt wrote:
> > On Tue, 9 Mar 2021 12:53:37 -0700
> > David Ahern wrote:
> >
> >> Changing the order of the fields will impact any bpf programs expecting
> >> the existing format
> >
> > I thought bpf progr
On Tue, Mar 9, 2021 at 12:18 PM David Ahern wrote:
>
> On 3/9/21 1:02 PM, Steven Rostedt wrote:
> > On Tue, 9 Mar 2021 12:53:37 -0700
> > David Ahern wrote:
> >
> >> Changing the order of the fields will impact any bpf programs expecting
> >> the existing format
> >
> > I thought bpf programs wer
On Tue, Mar 9, 2021 at 12:03 PM Steven Rostedt wrote:
>
> On Tue, 9 Mar 2021 12:53:37 -0700
> David Ahern wrote:
>
> > Changing the order of the fields will impact any bpf programs expecting
> > the existing format
>
> I thought bpf programs were not API.
That is correct.
On 3/9/21 1:02 PM, Steven Rostedt wrote:
> On Tue, 9 Mar 2021 12:53:37 -0700
> David Ahern wrote:
>
>> Changing the order of the fields will impact any bpf programs expecting
>> the existing format
>
> I thought bpf programs were not API. And why are they not parsing this
> information? They hav
On 3/9/21 5:43 AM, Tony Lu wrote:
> There are lots of net namespaces on the host runs containers like k8s.
> It is very common to see the same interface names among different net
> namespaces, such as eth0. It is not possible to distinguish them without
> net namespace inode.
>
> This adds net
On Tue, 9 Mar 2021 12:53:37 -0700
David Ahern wrote:
> Changing the order of the fields will impact any bpf programs expecting
> the existing format
I thought bpf programs were not API. And why are they not parsing this
information? They have these offsets hard coded Why would they do that!
On 3/9/21 10:40 AM, Steven Rostedt wrote:
> The order of the fields is important. Don't worry about breaking API by
> fixing it. The parsing code uses this output to find where the binary data
> is.
Changing the order of the fields will impact any bpf programs expecting
the existing format.
On Tue, 9 Mar 2021 12:43:50 +0800
Tony Lu wrote:
> There are lots of net namespaces on the host runs containers like k8s.
> It is very common to see the same interface names among different net
> namespaces, such as eth0. It is not possible to distinguish them without
> net namespace inode.
>
>
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