linux-kernel - Re: [PATCH v1 2/2] perf/core: Add support for PMUs that can be read from any CPU

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Message-ID: <5A90B845.3030504@codeaurora.org>
Date:   Fri, 23 Feb 2018 16:56:37 -0800
From:   Saravana Kannan <skannan@...eaurora.org>
To:     Saravana Kannan <skannan@...eaurora.org>
CC:     mark.rutland@....com, Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>, avilaj@...eaurora.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] perf/core: Add support for PMUs that can be read
 from any CPU

On 02/23/2018 04:19 PM, Saravana Kannan wrote:
> Some PMUs events can be read from any CPU. So allow the PMU to mark
> events as such. For these events, we don't need to reject reads or
> make smp calls to the event's CPU and cause unnecessary wake ups.
>
> Good examples of such events would be events from caches shared across
> all CPUs.
>
> Signed-off-by: Saravana Kannan <skannan@...eaurora.org>
> ---
>   include/linux/perf_event.h |  3 +++
>   kernel/events/core.c       | 10 ++++++++--
>   2 files changed, 11 insertions(+), 2 deletions(-)
>
>

Ugh! Didn't mean to chain these two emails. This one is independent of 
the other email.

-Saravana

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