linux-kernel - Re: [PATCH 1/2] perf kmem: Support legacy tracepoints

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Message-ID: <Y7zC5imskN9tvtBn@leoy-yangtze.lan>
Date:   Tue, 10 Jan 2023 09:45:11 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     James Clark <james.clark@....com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] perf kmem: Support legacy tracepoints

On Mon, Jan 09, 2023 at 12:38:04PM -0300, Arnaldo Carvalho de Melo wrote:

[...]

> > > +	const char * const slab_legacy_events[] = {
> > > +	"-e", "kmem:kmalloc_node",
> > > +	"-e", "kmem:kmem_cache_alloc_node",
> > > +	};
> > 
> > Reviewed-by: James Clark <james.clark@....com>
> > 
> > This fixes the error with mem:kmalloc_node for me.

Thanks for reviewing and testing!

> > I was thinking that it might be best to add all events to the list
> > conditionally instead of just the legacy ones. That way, the same error
> > won't happen in the future. But maybe it's best to have an explicit
> > error again in case the breaking change was unintentional so it's fine
> > as it is I think.

Yeah, this is a good idea for refactoring.

James, do you mind to send patches for this?

> Just applied this, the changes you brains stormed may come as later
> patches, thanks,

Thanks, Arnaldo.

Leo