linux-kernel - Re: [PATCH 01/10] perf/core: Add macro to test for event exclusion flags

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Date:   Tue, 20 Nov 2018 22:28:34 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Andrew Murray <andrew.murray@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>, x86@...nel.org
Cc:     linux-alpha@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/10] perf/core: Add macro to test for event exclusion flags

Andrew Murray <andrew.murray@....com> writes:

> Add a macro that tests if any of the perf event exclusion flags
> are set on a given event.
>
> Signed-off-by: Andrew Murray <andrew.murray@....com>
> ---
>  include/linux/perf_event.h | 9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
> index 53c500f..89ee7fa 100644
> --- a/include/linux/perf_event.h
> +++ b/include/linux/perf_event.h
> @@ -1004,6 +1004,15 @@ perf_event__output_id_sample(struct perf_event *event,
>  extern void
>  perf_log_lost_samples(struct perf_event *event, u64 lost);
>  
> +static inline bool event_has_exclude_flags(struct perf_event *event)
> +{
> +	struct perf_event_attr *attr = &event->attr;
> +
> +	return attr->exclude_idle || attr->exclude_user ||
> +	       attr->exclude_kernel || attr->exclude_hv ||
> +	       attr->exclude_guest || attr->exclude_host;
> +}

Sorry to be a total PITA, but using "flags" plural suggests that it only
returns true if there is more than one exclude flag set.

A better name would be event_has_exclude_flag() or maybe
event_has_any_exclude_flag().

If you're doing a respin anyway it'd be nice to fix the name, but
obviously it's not high priority.

cheers