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Date: Thu, 27 May 2010 20:08:43 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Arun Sharma <aruns@...gle.com>
Cc: linux-kernel@...r.kernel.org, mingo@...e.hu, paulus@...ba.org,
davem@...emloft.net, fweisbec@...il.com,
Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH] perf: implement recording/reporting per-cpu samples
Arnaldo, could you pick this up?
On Wed, 2010-05-05 at 11:16 -0700, Arun Sharma wrote:
> From 7ae0f1cd7d6ab0d74ab3f8a8a31b11d1cd416f36 Mon Sep 17 00:00:00 2001
> From: Arun Sharma <aruns@...gle.com>
> Date: Mon, 3 May 2010 11:45:41 -0700
> Subject: [PATCH] Implement --sort cpu
>
> In a shared multi-core environment, users want to analyze why their
> program was slow. In particular, if the code ran slower only on
> certain CPUs due to interference from other programs or kernel
> threads, the user should be able to notice that.
>
> Sample usage:
>
> perf record -f -a -- sleep 3
> perf report --sort cpu,comm
>
> Workload:
>
> program is running on 16 CPUs
> Experiencing interference from an antagonist only on 4 CPUs.
>
> Samples: 106218177676 cycles
>
> Overhead CPU Command
> ........ ... ...............
>
> 6.25% 2 program
> 6.24% 6 program
> 6.24% 11 program
> 6.24% 5 program
> 6.24% 9 program
> 6.24% 10 program
> 6.23% 15 program
> 6.23% 7 program
> 6.23% 3 program
> 6.23% 14 program
> 6.22% 1 program
> 6.20% 13 program
> 3.17% 12 program
> 3.15% 8 program
> 3.14% 0 program
> 3.13% 4 program
> 3.11% 4 antagonist
> 3.11% 0 antagonist
> 3.10% 8 antagonist
> 3.07% 12 antagonist
>
> Signed-off-by: Arun Sharma <aruns@...gle.com>
> ---
> tools/perf/builtin-record.c | 3 +++
> tools/perf/builtin-report.c | 7 +++++++
> tools/perf/util/hist.c | 1 +
> tools/perf/util/sort.c | 27 +++++++++++++++++++++++++++
> tools/perf/util/sort.h | 8 ++++++--
> tools/perf/util/symbol.h | 1 +
> 6 files changed, 45 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 27f992a..66867b8 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -290,6 +290,9 @@ static void create_counter(int counter, int cpu)
> if (call_graph)
> attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
>
> + if (system_wide)
> + attr->sample_type |= PERF_SAMPLE_CPU;
> +
> if (raw_samples) {
> attr->sample_type |= PERF_SAMPLE_TIME;
> attr->sample_type |= PERF_SAMPLE_RAW;
> diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
> index 816edae..6014d70 100644
> --- a/tools/perf/builtin-report.c
> +++ b/tools/perf/builtin-report.c
> @@ -190,6 +190,13 @@ static int process_sample_event(event_t *event, struct perf_session *session)
> return -1;
> }
>
> + if (session->sample_type & PERF_SAMPLE_CPU) {
> + dump_printf("... cpu: %d\n", data.cpu);
> + al.cpu = data.cpu;
> + } else {
> + al.cpu = -1;
> + }
> +
> if (al.filtered || (hide_unresolved && al.sym == NULL))
> return 0;
>
> diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
> index ad6b22d..4640015 100644
> --- a/tools/perf/util/hist.c
> +++ b/tools/perf/util/hist.c
> @@ -52,6 +52,7 @@ struct hist_entry *__perf_session__add_hist_entry(struct rb_root *hists,
> },
> .ip = al->addr,
> .level = al->level,
> + .cpu = al->cpu,
> .count = count,
> .parent = sym_parent,
> };
> diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
> index da30b30..ee70bb8 100644
> --- a/tools/perf/util/sort.c
> +++ b/tools/perf/util/sort.c
> @@ -13,6 +13,7 @@ enum sort_type sort__first_dimension;
> unsigned int dsos__col_width;
> unsigned int comms__col_width;
> unsigned int threads__col_width;
> +unsigned int cpu__col_width;
> static unsigned int parent_symbol__col_width;
> char * field_sep;
>
> @@ -28,6 +29,8 @@ static int hist_entry__sym_snprintf(struct hist_entry *self, char *bf,
> size_t size, unsigned int width);
> static int hist_entry__parent_snprintf(struct hist_entry *self, char *bf,
> size_t size, unsigned int width);
> +static int hist_entry__cpu_snprintf(struct hist_entry *self, char *bf,
> + size_t size, unsigned int width);
>
> struct sort_entry sort_thread = {
> .se_header = "Command: Pid",
> @@ -64,6 +67,13 @@ struct sort_entry sort_parent = {
> .se_width = &parent_symbol__col_width,
> };
>
> +struct sort_entry sort_cpu = {
> + .se_header = "CPU",
> + .se_cmp = sort__cpu_cmp,
> + .se_snprintf = hist_entry__cpu_snprintf,
> + .se_width = &cpu__col_width,
> +};
> +
> struct sort_dimension {
> const char *name;
> struct sort_entry *entry;
> @@ -76,6 +86,7 @@ static struct sort_dimension sort_dimensions[] = {
> { .name = "dso", .entry = &sort_dso, },
> { .name = "symbol", .entry = &sort_sym, },
> { .name = "parent", .entry = &sort_parent, },
> + { .name = "cpu", .entry = &sort_cpu, },
> };
>
> int64_t cmp_null(void *l, void *r)
> @@ -242,6 +253,20 @@ static int hist_entry__parent_snprintf(struct hist_entry *self, char *bf,
> self->parent ? self->parent->name : "[other]");
> }
>
> +/* --sort cpu */
> +
> +int64_t
> +sort__cpu_cmp(struct hist_entry *left, struct hist_entry *right)
> +{
> + return right->cpu - left->cpu;
> +}
> +
> +static int hist_entry__cpu_snprintf(struct hist_entry *self, char *bf,
> + size_t size, unsigned int width)
> +{
> + return repsep_snprintf(bf, size, "%-*d", width, self->cpu);
> +}
> +
> int sort_dimension__add(const char *tok)
> {
> unsigned int i;
> @@ -281,6 +306,8 @@ int sort_dimension__add(const char *tok)
> sort__first_dimension = SORT_SYM;
> else if (!strcmp(sd->name, "parent"))
> sort__first_dimension = SORT_PARENT;
> + else if (!strcmp(sd->name, "cpu"))
> + sort__first_dimension = SORT_CPU;
> }
>
> list_add_tail(&sd->entry->list, &hist_entry__sort_list);
> diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
> index b7c54ee..82c5596 100644
> --- a/tools/perf/util/sort.h
> +++ b/tools/perf/util/sort.h
> @@ -60,6 +60,7 @@ struct hist_entry {
> char level;
> u8 filtered;
> struct symbol *parent;
> + s32 cpu;
> union {
> unsigned long position;
> struct hist_entry *pair;
> @@ -73,7 +74,8 @@ enum sort_type {
> SORT_COMM,
> SORT_DSO,
> SORT_SYM,
> - SORT_PARENT
> + SORT_PARENT,
> + SORT_CPU
> };
>
> /*
> @@ -102,6 +104,8 @@ extern size_t sort__thread_print(FILE *, struct hist_entry *, unsigned int);
> extern size_t sort__comm_print(FILE *, struct hist_entry *, unsigned int);
> extern size_t sort__dso_print(FILE *, struct hist_entry *, unsigned int);
> extern size_t sort__sym_print(FILE *, struct hist_entry *, unsigned int __used);
> +extern size_t sort__parent_print(FILE *, struct hist_entry *, unsigned int);
> +extern size_t sort__cpu_print(FILE *, struct hist_entry *, unsigned int);
> extern int64_t cmp_null(void *, void *);
> extern int64_t sort__thread_cmp(struct hist_entry *, struct hist_entry *);
> extern int64_t sort__comm_cmp(struct hist_entry *, struct hist_entry *);
> @@ -109,7 +113,7 @@ extern int64_t sort__comm_collapse(struct hist_entry *, struct hist_entry *);
> extern int64_t sort__dso_cmp(struct hist_entry *, struct hist_entry *);
> extern int64_t sort__sym_cmp(struct hist_entry *, struct hist_entry *);
> extern int64_t sort__parent_cmp(struct hist_entry *, struct hist_entry *);
> -extern size_t sort__parent_print(FILE *, struct hist_entry *, unsigned int);
> +extern int64_t sort__cpu_cmp(struct hist_entry *, struct hist_entry *);
> extern int sort_dimension__add(const char *);
> void sort_entry__setup_elide(struct sort_entry *self, struct strlist *list,
> const char *list_name, FILE *fp);
> diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
> index 478f5ab..4b3e09d 100644
> --- a/tools/perf/util/symbol.h
> +++ b/tools/perf/util/symbol.h
> @@ -112,6 +112,7 @@ struct addr_location {
> char level;
> bool filtered;
> unsigned int cpumode;
> + s32 cpu;
> };
>
> enum dso_kernel_type {
--
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