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Date: Wed, 4 Mar 2020 11:07:43 -0500
From: "Liang, Kan" <kan.liang@...ux.intel.com>
To: Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc: jolsa@...hat.com, peterz@...radead.org, mingo@...hat.com,
linux-kernel@...r.kernel.org, namhyung@...nel.org,
adrian.hunter@...el.com, mathieu.poirier@...aro.org,
ravi.bangoria@...ux.ibm.com, alexey.budankov@...ux.intel.com,
vitaly.slobodskoy@...el.com, pavel.gerasimov@...el.com,
mpe@...erman.id.au, eranian@...gle.com, ak@...ux.intel.com
Subject: Re: [PATCH 01/12] perf tools: Add hw_idx in struct branch_stack
On 3/4/2020 10:45 AM, Arnaldo Carvalho de Melo wrote:
> Em Wed, Mar 04, 2020 at 10:49:02AM -0300, Arnaldo Carvalho de Melo escreveu:
>> Em Fri, Feb 28, 2020 at 08:30:00AM -0800, kan.liang@...ux.intel.com escreveu:
>>> From: Kan Liang <kan.liang@...ux.intel.com>
>>> The low level index of raw branch records for the most recent branch can
>>> be recorded in a sample with PERF_SAMPLE_BRANCH_HW_INDEX
>>> branch_sample_type. Extend struct branch_stack to support it.
>
>>> However, if the PERF_SAMPLE_BRANCH_HW_INDEX is not applied, only nr and
>>> entries[] will be output by kernel. The pointer of entries[] could be
>>> wrong, since the output format is different with new struct branch_stack.
>>> Add a variable no_hw_idx in struct perf_sample to indicate whether the
>>> hw_idx is output.
>>> Add get_branch_entry() to return corresponding pointer of entries[0].
>
>> This should be broken up in at least two patches, one that syncs
>> tools/include/uapi/linux/perf_event.h with the kernel, and another to do
>> what this changeset log message states, I'll do it this time to expedite
>> processing of this patchset, please do it that way next time.
>
Thanks. I will keep it in mind.
> So, after doing that split I'm also suggesting/tentatively applying this
> patch on top of it, to keep the naming convention we have in tools/perf,
> and also the 'static' to that inline,
Thanks. The changes look good to me.
Thanks,
Kan
> please holler if you disagree,
> I'll put the end result in a branch for further visualization/comments.
>
> At some point these functions obtaining stuff from a 'struct perf_sample' to
> tools/lib/perf/ (aka libperf), so better go doing proper namespacing,
> etc, right Jiri?
>
> - Arnaldo
>
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index acf3107bbda2..656b347f6dd8 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -735,7 +735,7 @@ static int perf_sample__fprintf_brstack(struct perf_sample *sample,
> struct perf_event_attr *attr, FILE *fp)
> {
> struct branch_stack *br = sample->branch_stack;
> - struct branch_entry *entries = get_branch_entry(sample);
> + struct branch_entry *entries = perf_sample__branch_entries(sample);
> struct addr_location alf, alt;
> u64 i, from, to;
> int printed = 0;
> @@ -783,7 +783,7 @@ static int perf_sample__fprintf_brstacksym(struct perf_sample *sample,
> struct perf_event_attr *attr, FILE *fp)
> {
> struct branch_stack *br = sample->branch_stack;
> - struct branch_entry *entries = get_branch_entry(sample);
> + struct branch_entry *entries = perf_sample__branch_entries(sample);
> struct addr_location alf, alt;
> u64 i, from, to;
> int printed = 0;
> @@ -829,7 +829,7 @@ static int perf_sample__fprintf_brstackoff(struct perf_sample *sample,
> struct perf_event_attr *attr, FILE *fp)
> {
> struct branch_stack *br = sample->branch_stack;
> - struct branch_entry *entries = get_branch_entry(sample);
> + struct branch_entry *entries = perf_sample__branch_entries(sample);
> struct addr_location alf, alt;
> u64 i, from, to;
> int printed = 0;
> @@ -1056,7 +1056,7 @@ static int perf_sample__fprintf_brstackinsn(struct perf_sample *sample,
> struct machine *machine, FILE *fp)
> {
> struct branch_stack *br = sample->branch_stack;
> - struct branch_entry *entries = get_branch_entry(sample);
> + struct branch_entry *entries = perf_sample__branch_entries(sample);
> u64 start, end;
> int i, insn, len, nr, ilen, printed = 0;
> struct perf_insn x;
> diff --git a/tools/perf/util/branch.h b/tools/perf/util/branch.h
> index 014c3cd4cb32..154a05cd03af 100644
> --- a/tools/perf/util/branch.h
> +++ b/tools/perf/util/branch.h
> @@ -54,7 +54,7 @@ struct branch_stack {
> * Check whether the hw_idx is available,
> * and return the corresponding pointer of entries[0].
> */
> -inline struct branch_entry *get_branch_entry(struct perf_sample *sample)
> +static inline struct branch_entry *perf_sample__branch_entries(struct perf_sample *sample)
> {
> u64 *entry = (u64 *)sample->branch_stack;
>
> diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
> index 808ca27bd5cf..e74a5acf66d9 100644
> --- a/tools/perf/util/hist.c
> +++ b/tools/perf/util/hist.c
> @@ -2584,7 +2584,7 @@ void hist__account_cycles(struct branch_stack *bs, struct addr_location *al,
> u64 *total_cycles)
> {
> struct branch_info *bi;
> - struct branch_entry *entries = get_branch_entry(sample);
> + struct branch_entry *entries = perf_sample__branch_entries(sample);
>
> /* If we have branch cycles always annotate them. */
> if (bs && bs->nr && entries[0].flags.cycles) {
> diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
> index b0623f99fb9c..fd14f1489802 100644
> --- a/tools/perf/util/machine.c
> +++ b/tools/perf/util/machine.c
> @@ -2081,7 +2081,7 @@ struct branch_info *sample__resolve_bstack(struct perf_sample *sample,
> {
> unsigned int i;
> const struct branch_stack *bs = sample->branch_stack;
> - struct branch_entry *entries = get_branch_entry(sample);
> + struct branch_entry *entries = perf_sample__branch_entries(sample);
> struct branch_info *bi = calloc(bs->nr, sizeof(struct branch_info));
>
> if (!bi)
> @@ -2186,7 +2186,7 @@ static int resolve_lbr_callchain_sample(struct thread *thread,
> /* LBR only affects the user callchain */
> if (i != chain_nr) {
> struct branch_stack *lbr_stack = sample->branch_stack;
> - struct branch_entry *entries = get_branch_entry(sample);
> + struct branch_entry *entries = perf_sample__branch_entries(sample);
> int lbr_nr = lbr_stack->nr, j, k;
> bool branch;
> struct branch_flags *flags;
> @@ -2281,7 +2281,7 @@ static int thread__resolve_callchain_sample(struct thread *thread,
> int max_stack)
> {
> struct branch_stack *branch = sample->branch_stack;
> - struct branch_entry *entries = get_branch_entry(sample);
> + struct branch_entry *entries = perf_sample__branch_entries(sample);
> struct ip_callchain *chain = sample->callchain;
> int chain_nr = 0;
> u8 cpumode = PERF_RECORD_MISC_USER;
> diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
> index 02b6c87c5abe..8c1b27cd8b99 100644
> --- a/tools/perf/util/scripting-engines/trace-event-python.c
> +++ b/tools/perf/util/scripting-engines/trace-event-python.c
> @@ -464,7 +464,7 @@ static PyObject *python_process_brstack(struct perf_sample *sample,
> struct thread *thread)
> {
> struct branch_stack *br = sample->branch_stack;
> - struct branch_entry *entries = get_branch_entry(sample);
> + struct branch_entry *entries = perf_sample__branch_entries(sample);
> PyObject *pylist;
> u64 i;
>
> @@ -562,7 +562,7 @@ static PyObject *python_process_brstacksym(struct perf_sample *sample,
> struct thread *thread)
> {
> struct branch_stack *br = sample->branch_stack;
> - struct branch_entry *entries = get_branch_entry(sample);
> + struct branch_entry *entries = perf_sample__branch_entries(sample);
> PyObject *pylist;
> u64 i;
> char bf[512];
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index dab985e3f136..055b00abd56d 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -1007,7 +1007,7 @@ static void callchain__lbr_callstack_printf(struct perf_sample *sample)
> {
> struct ip_callchain *callchain = sample->callchain;
> struct branch_stack *lbr_stack = sample->branch_stack;
> - struct branch_entry *entries = get_branch_entry(sample);
> + struct branch_entry *entries = perf_sample__branch_entries(sample);
> u64 kernel_callchain_nr = callchain->nr;
> unsigned int i;
>
> @@ -1069,7 +1069,7 @@ static void callchain__printf(struct evsel *evsel,
>
> static void branch_stack__printf(struct perf_sample *sample, bool callstack)
> {
> - struct branch_entry *entries = get_branch_entry(sample);
> + struct branch_entry *entries = perf_sample__branch_entries(sample);
> uint64_t i;
>
> printf("%s: nr:%" PRIu64 "\n",
>
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