Messages in this thread | | | Date | Mon, 9 Oct 2017 07:07:29 -0700 | From | Andi Kleen <> | Subject | Re: [PATCH 2/2] perf, tools: Don't force MetricExprs to lower case |
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On Mon, Oct 09, 2017 at 03:41:51PM +0200, Jiri Olsa wrote: > On Wed, Oct 04, 2017 at 09:27:11AM -0700, Andi Kleen wrote: > > On Wed, Oct 04, 2017 at 12:30:52PM +0200, Jiri Olsa wrote: > > > On Tue, Oct 03, 2017 at 01:06:05PM -0300, Arnaldo Carvalho de Melo wrote: > > > > Em Tue, Sep 12, 2017 at 12:56:43PM -0700, Andi Kleen escreveu: > > > > > From: Andi Kleen <ak@linux.intel.com> > > > > > > > > > > There are still problems with BPF misinterpreting some events > > > > > that include .c. An earlier fix made it work for stand alone > > > > > aliases, but it still fails for more complex constructs. > > > > > > > > Hi Wang, Jiri, > > > > > > > > Can you please take a look at this and see if there is something > > > > we can do to help Andi? > > > > > > > > - Arnaldo > > > > > > > > > REJECT keeps trying and trying a shorter string until > > > > > .c is matched and it appears like a valid BPF path. > > > > > > > > > > % perf stat -e cpu/uops_executed.core,cmask=1/ true > > > > > bpf: builtin compilation failed: -95, try external compiler > > > > > ERROR: problems with path cpu/uops_executed.c: No such file or directory > > > > > event syntax error: 'cpu/uops_executed.core,cmask=1/' > > > > > \___ Failed to load cpu/uops_executed.c from source: Error when compiling BPF scriptlet > > > > > > > > > > I tried to fix it, but it exceeds my flex knowledge, because > > > > > REJECT does not interact well with BEGIN states. > > > > > > > > > > The BPF syntax in its current form really causes an ambigious > > > > > grammar. > > > > > > right, it looks like we allow whole path (including / char) > > > for BPF file, which messes up with out pmu/.../ syntax > > > > > > do we need that? (Cc-ed some bpf folks) > > > > > > if not attached patch seems to fix things.. otherwise > > > we need to come up with another fix > > > > I tried similar patches, but I always ran into more complex > > situations where it still matched incorrectly. > > > > e.g. try it with cpu/uops_executed.core,... vs uops_executed.core > > hm, both works for me with the change: > > perf stat -e cpu/uops_executed.core/ ls > perf stat -e uops_executed.core ls
Ok. If it works it's fine for me.
> > > The only real fix would be probably to add some unique > > prefix for BPF, but that would break all existing users. > > > yea, there was no response from bpf folks, but it's probably not an optio > > how about checking if the file exist like below..
I presume that would interact badly with good error messages for typos for file names.
-Andi
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