linux-kernel - Re: [PATCH v3] perf record: Use an eventfd to wakeup when done

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Date:   Sat, 23 May 2020 06:34:56 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Anand K Mistry <amistry@...gle.com>
Cc:     linux-perf-users@...r.kernel.org,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] perf record: Use an eventfd to wakeup when done

Anand K Mistry <amistry@...gle.com> writes:
>  	}
>  
> +	done_fd = eventfd(0, EFD_NONBLOCK);

This will make perf depend on a recent glibc or other library
that implements eventfd. Wouldn't surprise me if some kind
of build time check is needed for this to pass all of Arnaldo's
built tests.


-Andi