From: Anshuman Khandual <anshuman.khandual@arm.com>
To: James Clark <james.clark@arm.com>,
acme@kernel.org, linux-perf-users@vger.kernel.org
Cc: german.gomez@arm.com, leo.yan@linaro.com,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 4/4] perf script: Output branch sample type
Date: Tue, 8 Mar 2022 10:52:12 +0530 [thread overview]
Message-ID: <3b6007ef-1ad8-c495-26aa-7974af8faefa@arm.com> (raw)
In-Reply-To: <20220307171917.2555829-5-james.clark@arm.com>
On 3/7/22 22:49, James Clark wrote:
> The type info is saved when using '-j save_type'. Output this in perf
Mentioning PERF_SAMPLE_BRANCH_CALL_STACK here as well might be better.
> script so it can be accessed by other tools or for debugging.
>
> It's appended to the end of the list of fields so any existing tools
> that split on / and access fields via an index are not affected. Also
> output '-' instead of 'N/A' when the branch type isn't saved because /
> is used as a field separator.
Did not get it. Why 'N/A' should have been used anyway ?
>
> Entries before this change look like this:
>
> 0xaaaadb350838/0xaaaadb3507a4/P/-/-/0
>
> And afterwards like this:
>
> 0xaaaadb350838/0xaaaadb3507a4/P/-/-/0/CALL
>
> or this if no type info is saved:
>
> 0x7fb57586df6b/0x7fb5758731f0/P/-/-/143/-
143 ?
>
> Signed-off-by: James Clark <james.clark@arm.com>
> ---
> tools/perf/builtin-script.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index fac2e9470926..5e4a262a6825 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -859,11 +859,12 @@ mispred_str(struct branch_entry *br)
>
> static int print_bstack_flags(FILE *fp, struct branch_entry *br)
> {
> - return fprintf(fp, "/%c/%c/%c/%d ",
> + return fprintf(fp, "/%c/%c/%c/%d/%s ",
> mispred_str(br),
> br->flags.in_tx ? 'X' : '-',
> br->flags.abort ? 'A' : '-',
> - br->flags.cycles);
> + br->flags.cycles,
> + br->flags.type ? branch_type_name(br->flags.type) : "-");
> }
>
> static int perf_sample__fprintf_brstack(struct perf_sample *sample,
LGTM but as mentioned before, I hope this does not affect any existing
parsing tools.
next prev parent reply other threads:[~2022-03-08 5:22 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-07 17:19 [PATCH 0/4] Branch stack improvements James Clark
2022-03-07 17:19 ` [PATCH 1/4] perf: Add error message for unsupported branch stack cases James Clark
2022-03-08 4:17 ` Anshuman Khandual
2022-03-07 17:19 ` [PATCH 2/4] perf: Print branch stack entry type in --dump-raw-trace James Clark
2022-03-08 4:29 ` Anshuman Khandual
2022-03-08 11:58 ` James Clark
2022-03-07 17:19 ` [PATCH 3/4] perf: Refactor perf script branch stack printing James Clark
2022-03-08 5:06 ` Anshuman Khandual
2022-03-07 17:19 ` [PATCH 4/4] perf script: Output branch sample type James Clark
2022-03-08 5:22 ` Anshuman Khandual [this message]
2022-03-08 12:09 ` James Clark
2022-03-07 17:53 ` [PATCH 0/4] Branch stack improvements Arnaldo Carvalho de Melo
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