perf, tools: Use correct articles in comments
Some of the comments in the perf events code use articles incorrectly, using 'a' for words beginning with a vowel sound, where 'an' should be used. Signed-off-by: Tobias Tefke <tobias.tefke@tutanota.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: acme@kernel.org Cc: alexander.shishkin@linux.intel.com Cc: jolsa@redhat.com Cc: namhyung@kernel.org Link: http://lkml.kernel.org/r/20180709105715.22938-1-tobias.tefke@tutanota.com [ Fix a few more perf related 'a event' typo fixes from all around the kernel and tooling tree. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Ingo Molnar

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@@ -234,7 +234,7 @@ perf also supports group leader sampling using the :S specifier.
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perf record -e '{cycles,instructions}:S' ...
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perf report --group
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Normally all events in a event group sample, but with :S only
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Normally all events in an event group sample, but with :S only
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the first event (the leader) samples, and it only reads the values of the
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other events in the group.
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@@ -94,7 +94,7 @@ OPTIONS
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"perf report" to view group events together.
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--filter=<filter>::
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Event filter. This option should follow a event selector (-e) which
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Event filter. This option should follow an event selector (-e) which
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selects either tracepoint event(s) or a hardware trace PMU
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(e.g. Intel PT or CoreSight).
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@@ -153,7 +153,7 @@ OPTIONS
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--exclude-perf::
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Don't record events issued by perf itself. This option should follow
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a event selector (-e) which selects tracepoint event(s). It adds a
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an event selector (-e) which selects tracepoint event(s). It adds a
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filter expression 'common_pid != $PERFPID' to filters. If other
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'--filter' exists, the new filter expression will be combined with
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them by '&&'.
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