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Message-ID: <0ef6a6b0-dc0b-5ef4-778f-c93645c44d9f@arm.com>
Date: Tue, 9 Mar 2021 16:10:01 +0000
From: Alexandre Truong <alexandre.truong@....com>
To: Leo Yan <leo.yan@...aro.org>
Cc: linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
John Garry <john.garry@...wei.com>,
Will Deacon <will@...nel.org>,
Mathieu Poirier <mathieu.poirier@...aro.org>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...hat.com>,
Namhyung Kim <namhyung@...nel.org>,
Kemeng Shi <shikemeng@...wei.com>,
Ian Rogers <irogers@...gle.com>,
Andi Kleen <ak@...ux.intel.com>,
Kan Liang <kan.liang@...ux.intel.com>,
Jin Yao <yao.jin@...ux.intel.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Suzuki K Poulose <suzuki.poulose@....com>,
Al Grant <al.grant@....com>, James Clark <james.clark@....com>,
Wilco Dijkstra <wilco.dijkstra@....com>
Subject: Re: [PATCH RESEND WITH CCs v3 3/4] perf tools: enable
dwarf_callchain_users on aarch64
Hi Leo,
Thanks for your message, I'll apply your suggestion for the v4 of the patch.
Regards,
Alexandre
On 3/5/21 2:07 PM, Leo Yan wrote:
> On Fri, Mar 05, 2021 at 07:51:20PM +0800, Leo Yan wrote:
>
> [...]
>
>>> diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
>>> index 2a845d6cac09..93661a3eaeb1 100644
>>> --- a/tools/perf/builtin-report.c
>>> +++ b/tools/perf/builtin-report.c
>>> @@ -405,6 +405,10 @@ static int report__setup_sample_type(struct report *rep)
>>>
>>> callchain_param_setup(sample_type);
>>>
>>> + if (callchain_param.record_mode == CALLCHAIN_FP &&
>>> + strncmp(rep->session->header.env.arch, "aarch64", 7) == 0)
>>> + dwarf_callchain_users = true;
>>> +
>>
>> I don't have knowledge for dwarf or FP.
>>
>> This patch is suspicious for me that since it only fixes the issue for
>> "perf report" command, but it cannot support "perf script".
>>
>> I did a quick testing for "perf script" command with the test code from
>> patch 04, seems to me it cannot fix the fp omitting issue for
>> "perf script" command:
>>
>> arm64_fp_test 11211 2282.355095: 176307 cycles:
>> aaaac2e40740 f2+0x10 (/root/arm64_fp_test)
>> aaaac2e4061c main+0xc (/root/arm64_fp_test)
>> ffff961fbd24 __libc_start_main+0xe4 (/usr/lib/aarch64-linux-gnu/libc-2.28.so)
>> aaaac2e4065c _start+0x34 (/root/arm64_fp_test)
>>
>> Could you check for this? Thanks!
>
> Maybe we can consolidate the setting for the global variable
> "dwarf_callchain_users" with below change; this can help us to cover
> the tools for most cases. I used the below change to replact patch
> 03, "perf report" and "perf script" both can work well with it.
>
> Please note, if you want to move forward with this way, it's better to
> use a saperate patch for firstly refactoring the function
> script__setup_sample_type() by using the general API
> callchain_param_setup() to replace the duplicate code pieces for
> callchain parameter setting up.
>
> After that, you could apply the reset change for adding new parameter
> "arch" for the function script__setup_sample_type().
>
>
> diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
> index 2a845d6cac09..ca2e8c9096ea 100644
> --- a/tools/perf/builtin-report.c
> +++ b/tools/perf/builtin-report.c
> @@ -1090,7 +1090,8 @@ static int process_attr(struct perf_tool *tool __maybe_unused,
> * on events sample_type.
> */
> sample_type = evlist__combined_sample_type(*pevlist);
> - callchain_param_setup(sample_type);
> + callchain_param_setup(sample_type,
> + perf_env__arch((*pevlist)->env));
> return 0;
> }
>
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index 5915f19cee55..c49212c135b2 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -2250,7 +2250,8 @@ static int process_attr(struct perf_tool *tool, union perf_event *event,
> * on events sample_type.
> */
> sample_type = evlist__combined_sample_type(evlist);
> - callchain_param_setup(sample_type);
> + callchain_param_setup(sample_type,
> + perf_env__arch((*pevlist)->env));
>
> /* Enable fields for callchain entries */
> if (symbol_conf.use_callchain &&
> @@ -3309,16 +3310,8 @@ static void script__setup_sample_type(struct perf_script *script)
> struct perf_session *session = script->session;
> u64 sample_type = evlist__combined_sample_type(session->evlist);
>
> - if (symbol_conf.use_callchain || symbol_conf.cumulate_callchain) {
> - if ((sample_type & PERF_SAMPLE_REGS_USER) &&
> - (sample_type & PERF_SAMPLE_STACK_USER)) {
> - callchain_param.record_mode = CALLCHAIN_DWARF;
> - dwarf_callchain_users = true;
> - } else if (sample_type & PERF_SAMPLE_BRANCH_STACK)
> - callchain_param.record_mode = CALLCHAIN_LBR;
> - else
> - callchain_param.record_mode = CALLCHAIN_FP;
> - }
> + callchain_param_setup(sample_type,
> + perf_env__arch(session->machines.host.env));
>
> if (script->stitch_lbr && (callchain_param.record_mode != CALLCHAIN_LBR)) {
> pr_warning("Can't find LBR callchain. Switch off --stitch-lbr.\n"
> diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
> index 1b60985690bb..d9766b54cd1a 100644
> --- a/tools/perf/util/callchain.c
> +++ b/tools/perf/util/callchain.c
> @@ -1600,7 +1600,7 @@ void callchain_cursor_reset(struct callchain_cursor *cursor)
> map__zput(node->ms.map);
> }
>
> -void callchain_param_setup(u64 sample_type)
> +void callchain_param_setup(u64 sample_type, const char *arch)
> {
> if (symbol_conf.use_callchain || symbol_conf.cumulate_callchain) {
> if ((sample_type & PERF_SAMPLE_REGS_USER) &&
> @@ -1612,6 +1612,14 @@ void callchain_param_setup(u64 sample_type)
> else
> callchain_param.record_mode = CALLCHAIN_FP;
> }
> +
> + /*
> + * Fixup for arm64 due to the frame pointer was omitted for the
> + * caller of the leaf frame.
> + */
> + if (callchain_param.record_mode == CALLCHAIN_FP &&
> + strncmp(arch, "arm64", 6) == 0)
> + dwarf_callchain_users = true;
> }
>
> static bool chain_match(struct callchain_list *base_chain,
> diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h
> index 77fba053c677..d95615daed73 100644
> --- a/tools/perf/util/callchain.h
> +++ b/tools/perf/util/callchain.h
> @@ -300,7 +300,7 @@ int callchain_branch_counts(struct callchain_root *root,
> u64 *branch_count, u64 *predicted_count,
> u64 *abort_count, u64 *cycles_count);
>
> -void callchain_param_setup(u64 sample_type);
> +void callchain_param_setup(u64 sample_type, const char *arch);
>
> bool callchain_cnode_matched(struct callchain_node *base_cnode,
> struct callchain_node *pair_cnode);
>
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