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perf tools: Emit clearer message for sys_perf_event_open ENOENT return
Resend of patch sent back in January 2011 in light of recent confusion around
unsupported events for a given platform.
Improve sys_perf_event_open ENOENT return handling in top and record, just
like 5a3446b
does for stat.
Retry of Arnaldo's patch using ui_warning instead of die which allows the
fallback from hardware cycles to software clock.
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
LKML-Reference: <1301080271-20945-1-git-send-email-daahern@cisco.com>
Signed-off-by: David Ahern <daahern@cisco.com>
[ committer note: Some adjustments to make it apply to newer codebase ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
parent
c286c419c7
commit
ca6a42586f
@ -301,11 +301,19 @@ try_again:
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&& attr->config == PERF_COUNT_HW_CPU_CYCLES) {
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if (verbose)
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warning(" ... trying to fall back to cpu-clock-ticks\n");
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ui__warning("The cycles event is not supported, "
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"trying to fall back to cpu-clock-ticks\n");
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attr->type = PERF_TYPE_SOFTWARE;
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attr->config = PERF_COUNT_SW_CPU_CLOCK;
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goto try_again;
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}
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if (err == ENOENT) {
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ui__warning("The %s event is not supported.\n",
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event_name(pos));
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exit(EXIT_FAILURE);
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}
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printf("\n");
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error("sys_perf_event_open() syscall returned with %d (%s). /bin/dmesg may provide additional information.\n",
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err, strerror(err));
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@ -870,6 +870,12 @@ try_again:
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goto try_again;
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}
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if (err == ENOENT) {
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ui__warning("The %s event is not supported.\n",
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event_name(counter));
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goto out_err;
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}
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ui__warning("The sys_perf_event_open() syscall "
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"returned with %d (%s). /bin/dmesg "
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"may provide additional information.\n"
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