linux-kernel - Re: [PATCH v3 12/27] perf parse-events: Support no alias assigned event inside hybrid PMU

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Date:   Tue, 13 Apr 2021 14:36:32 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     "Jin, Yao" <yao.jin@...ux.intel.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v3 12/27] perf parse-events: Support no alias assigned
 event inside hybrid PMU

On Mon, Apr 12, 2021 at 10:51:14AM +0800, Jin, Yao wrote:

SNIP

> 
> Do you suggest we just use string comparison for doing the direct check?
> 
> e.g.
> 
> if (strstr(term->config, "L1-dcache"))
> 	...
> 
> Of course, we can define a string array first and use a loop for string comparison.
> 
> > > +	if (!parse_state->fake_pmu && head_config && !found &&
> > > +	    perf_pmu__is_hybrid(name)) {
> > > +		struct parse_events_term *term;
> > > +		int ret;
> > > +
> > > +		list_for_each_entry(term, head_config, list) {
> > > +			if (!term->config)
> > > +				continue;
> > > +
> > > +			ret = parse_events__with_hybrid_pmu(parse_state,
> > > +							    term->config,
> > > +							    name, &found,
> > > +							    list);
> > 
> > do we need to call the parsing again? could we just call
> > parse_events__add_cache_hybrid?
> > 
> > jirka
> > 
> > 
> 
> If we do the direct check for cache events, I think we don't need the parsing again.
> 
> As I mentioned above, we need to define a string array and compare with term->config one by one.
> 

maybe another way is to find a way to run just the lexer (without
parser) and check that it returns PE_NAME_CACHE_OP_RESULT

jirka