* David Ahern wrote:
> On 11/10/14, 5:24 AM, Ingo Molnar wrote:
> >Programmatic use in user-spaec is very simple - go with my
> >initial example, tooling can either just display the error string
> >and bail out, or do:
> >
> > if (unlikely(error)) {
> > if (!strcmp(attr->error_str, "x86/bt
On 11/10/14, 5:24 AM, Ingo Molnar wrote:
Programmatic use in user-spaec is very simple - go with my
initial example, tooling can either just display the error string
and bail out, or do:
if (unlikely(error)) {
if (!strcmp(attr->error_str, "x86/bts: BTS not supported by this CPU
archi
Em Mon, Nov 10, 2014 at 01:24:47PM +0100, Ingo Molnar escreveu:
> * Arnaldo Carvalho de Melo wrote:
> > Em Mon, Nov 10, 2014 at 11:27:25AM +0100, Ingo Molnar escreveu:
> > > * Arnaldo Carvalho de Melo wrote:
> > > > Em Mon, Nov 03, 2014 at 05:50:19PM +0100, Peter Zijlstra escreveu:
> > > > > OK,
* Arnaldo Carvalho de Melo wrote:
> Em Mon, Nov 10, 2014 at 11:27:25AM +0100, Ingo Molnar escreveu:
> >
> > * Arnaldo Carvalho de Melo wrote:
> >
> > > Em Mon, Nov 03, 2014 at 05:50:19PM +0100, Peter Zijlstra escreveu:
> > > > On Mon, Nov 03, 2014 at 02:25:48PM -0200, Arnaldo Carvalho de Melo
Em Mon, Nov 10, 2014 at 11:27:25AM +0100, Ingo Molnar escreveu:
>
> * Arnaldo Carvalho de Melo wrote:
>
> > Em Mon, Nov 03, 2014 at 05:50:19PM +0100, Peter Zijlstra escreveu:
> > > On Mon, Nov 03, 2014 at 02:25:48PM -0200, Arnaldo Carvalho de Melo wrote:
> >
> > > > The way that peterz suggest
* Stephane Eranian wrote:
> Hi,
>
> On Fri, Oct 31, 2014 at 1:28 PM, Matt Fleming wrote:
> > On Fri, 31 Oct, at 10:27:13AM, Ingo Molnar wrote:
> >>
> >> - user-space gets back the regular errno (-EOPNOTSUPP or -ENOSYS
> >>or -EINVAL, etc.) and a string. Strings are really the most
> >>
* Arnaldo Carvalho de Melo wrote:
> Em Mon, Nov 03, 2014 at 05:50:19PM +0100, Peter Zijlstra escreveu:
> > On Mon, Nov 03, 2014 at 02:25:48PM -0200, Arnaldo Carvalho de Melo wrote:
>
> > > The way that peterz suggested, i.e. returning information about which
> > > perf_event_attr and which of
On Mon, Nov 03, 2014 at 12:12:18PM -0500, Vince Weaver wrote:
> I don't know if having an offset/mask helps much. Knowing your EINVAL
> comes from ->config is nice to know, but if there's 30 different ways
> to get an EINVAL from an improper config then you still can waste a lot
> of time narrowin
On Mon, 3 Nov 2014, Arnaldo Carvalho de Melo wrote:
> Em Mon, Nov 03, 2014 at 05:50:19PM +0100, Peter Zijlstra escreveu:
> > On Mon, Nov 03, 2014 at 02:25:48PM -0200, Arnaldo Carvalho de Melo wrote:
>
> > > The way that peterz suggested, i.e. returning information about which
> > > perf_event_at
Em Mon, Nov 03, 2014 at 05:50:19PM +0100, Peter Zijlstra escreveu:
> On Mon, Nov 03, 2014 at 02:25:48PM -0200, Arnaldo Carvalho de Melo wrote:
> > The way that peterz suggested, i.e. returning information about which
> > perf_event_attr and which of the parameters was invalid/had issues could
> >
On Mon, Nov 03, 2014 at 02:25:48PM -0200, Arnaldo Carvalho de Melo wrote:
> The way that peterz suggested, i.e. returning information about which
> perf_event_attr and which of the parameters was invalid/had issues could
> help with fallbacking/capability querying, i.e. tooling may want to use
> s
Em Sat, Nov 01, 2014 at 01:30:39AM -0400, Vince Weaver escreveu:
> On Fri, 31 Oct 2014, Stephane Eranian wrote:
>
> > On Fri, Oct 31, 2014 at 1:28 PM, Matt Fleming
> > wrote:
> > >
> > > I guess we'd run into a problem if userspace doesn't want to just print
> > > the kernel string but instead w
On Fri, 31 Oct, at 10:27:13AM, Ingo Molnar wrote:
>
> - user-space gets back the regular errno (-EOPNOTSUPP or -ENOSYS
>or -EINVAL, etc.) and a string. Strings are really the most
>helpful information, because tools can just print that. They
>can also match on specific strings and p
On Fri, 31 Oct 2014, Stephane Eranian wrote:
> On Fri, Oct 31, 2014 at 1:28 PM, Matt Fleming wrote:
> >
> > I guess we'd run into a problem if userspace doesn't want to just print
> > the kernel string but instead wants to parse it in some fashion.
If the string interface went in it would be a h
Hi,
On Fri, Oct 31, 2014 at 1:28 PM, Matt Fleming wrote:
> On Fri, 31 Oct, at 10:27:13AM, Ingo Molnar wrote:
>>
>> - user-space gets back the regular errno (-EOPNOTSUPP or -ENOSYS
>>or -EINVAL, etc.) and a string. Strings are really the most
>>helpful information, because tools can just
Em Thu, Oct 30, 2014 at 09:16:36PM -0400, Vince Weaver escreveu:
> On Thu, 30 Oct 2014, Peter Zijlstra wrote:
>
> > So would something simple, like an offset into the struct
> > perf_event_attr pointing at the current field we're trying to process
> > make sense? Maybe with negative offsets to ind
* Peter Zijlstra wrote:
> On Thu, Oct 30, 2014 at 09:16:36PM -0400, Vince Weaver wrote:
> > On Thu, 30 Oct 2014, Peter Zijlstra wrote:
> >
> > > So would something simple, like an offset into the struct
> > > perf_event_attr pointing at the current field we're trying
> > > to process make sen
On Thu, Oct 30, 2014 at 09:16:36PM -0400, Vince Weaver wrote:
> On Thu, 30 Oct 2014, Peter Zijlstra wrote:
>
> > So would something simple, like an offset into the struct
> > perf_event_attr pointing at the current field we're trying to process
> > make sense? Maybe with negative offsets to indica
On Thu, 30 Oct 2014, Peter Zijlstra wrote:
> So would something simple, like an offset into the struct
> perf_event_attr pointing at the current field we're trying to process
> make sense? Maybe with negative offsets to indicate the syscall
> arguments?
>
> That would narrow down the 'WTF is wron
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