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Message-ID: <20141118211319.GD3790@kernel.org>
Date: Tue, 18 Nov 2014 18:13:19 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: kan.liang@...el.com
Cc: jolsa@...hat.com, namhyung@...nel.org,
linux-kernel@...r.kernel.org, ak@...ux.intel.com
Subject: Re: [PATCH V4 3/3] perf tool: Add sort key symoff for perf diff
Em Tue, Nov 18, 2014 at 11:38:20AM -0500, kan.liang@...el.com escreveu:
> From: Kan Liang <kan.liang@...el.com>
>
> Sometime, especially debugging scaling issue, the function level diff
> may be high granularity. The user may want to do deeper diff analysis
> for some cache or lock issue. The "symoff" key can let the user sort
> differential profile by ips. This feature should only work when the
> perf.data comes from same binary.
So, to avoid having people scratching heads, and since we have the
build-id for both perf.data files, hence for both binaries being
compared, can we check the build ids and either refuse to do the diff or
print a big warning about different binaries being compared?
- Arnaldo
> Here is an example.
> perf diff -s symoff v1_1_8_1perf.data v1_1_8_2perf.data
>
> Event 'cycles'
>
> Baseline Delta Symbol + Offset
> ........ ....... ...............................
>
> 0.00% __update_cpu_load+0xcc
> _raw_spin_lock_irqsave+0x24
> _raw_spin_unlock_irqrestore+0xa
> 0.00% apic_timer_interrupt+0x0
> apic_timer_interrupt+0x68
> check_preempt_curr+0x1c
> 0.00% f1+0x20
> 0.03% +0.03% f2+0x11
> 0.03% +0.01% f2+0x16
> 0.05% f2+0x1b
> 0.04% -0.02% f2+0x20
> 0.03% f2+0x25
> 0.17% +0.11% f2+0x29
> 0.15% f2+0x2d
> f2+0x30
> 0.37% +0.02% f3+0x0
> 0.18% +0.03% f3+0x1
> 0.01% f3+0x4
> 0.18% +0.04% f3+0xb
> 12.31% +0.11% f3+0xd
> 0.03% f3+0x10
> 0.80% -0.12% f3+0x13
> 6.66% +0.09% f3+0x17
> 1.81% -0.36% f3+0x1b
> 6.35% +0.24% f3+0x1d
> 1.42% -0.22% f3+0x21
> 66.83% +0.22% f3+0x25
> 1.29% -0.12% f3+0x27
> 1.22% -0.04% f3+0x28
> 0.00% load_balance+0x96
> 0.00% native_apic_mem_write+0x0
> 0.00% native_write_msr_safe+0xa
> 0.00% native_write_msr_safe+0xd
> 0.00% rb_erase+0x381
> resched_curr+0x5
> restore_args+0x4
> 0.00% run_timer_softirq+0x29f
> select_task_rq_fair+0x9
> 0.00% select_task_rq_fair+0x1d9
> task_tick_fair+0x46
> 0.00% task_tick_fair+0x1ce
> task_waking_fair+0x27
> 0.00% try_to_wake_up+0x158
> update_cfs_rq_blocked_load+0x99
> 0.00% update_cpu_load_active+0x3b
> update_group_capacity+0x150
> update_wall_time+0x3c6
>
> Signed-off-by: Kan Liang <kan.liang@...el.com>
> ---
> tools/perf/Documentation/perf-diff.txt | 8 +++-
> tools/perf/builtin-diff.c | 2 +-
> tools/perf/util/hist.c | 5 ++-
> tools/perf/util/hist.h | 1 +
> tools/perf/util/sort.c | 67 ++++++++++++++++++++++++++++++++++
> tools/perf/util/sort.h | 2 +
> 6 files changed, 80 insertions(+), 5 deletions(-)
>
> diff --git a/tools/perf/Documentation/perf-diff.txt b/tools/perf/Documentation/perf-diff.txt
> index e463caa..9e13911 100644
> --- a/tools/perf/Documentation/perf-diff.txt
> +++ b/tools/perf/Documentation/perf-diff.txt
> @@ -50,8 +50,12 @@ OPTIONS
>
> -s::
> --sort=::
> - Sort by key(s): pid, comm, dso, symbol, cpu, parent, srcline.
> - Please see description of --sort in the perf-report man page.
> + Sort by key(s): pid, comm, dso, symbol, cpu, parent, srcline, symoff.
> +
> + - symoff: exact symbol + offset address executed at the time of sample.
> + (for same binary compare)
> +
> + For other keys, please see description of --sort in the perf-report man page.
>
> -t::
> --field-separator=::
> diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
> index 1ce425d..03a4001 100644
> --- a/tools/perf/builtin-diff.c
> +++ b/tools/perf/builtin-diff.c
> @@ -744,7 +744,7 @@ static const struct option options[] = {
> OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
> "only consider these symbols"),
> OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
> - "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
> + "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, symoff, ..."
> " Please refer the man page for the complete list."),
> OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
> "separator for columns, no spaces will be added between "
> diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
> index 6e88b9e..3d8a71b 100644
> --- a/tools/perf/util/hist.c
> +++ b/tools/perf/util/hist.c
> @@ -67,13 +67,14 @@ void hists__calc_col_len(struct hists *hists, struct hist_entry *h)
> symlen = h->ms.sym->namelen + 4;
> if (verbose)
> symlen += BITS_PER_LONG / 4 + 2 + 3;
> - hists__new_col_len(hists, HISTC_SYMBOL, symlen);
> } else {
> symlen = unresolved_col_width + 4 + 2;
> - hists__new_col_len(hists, HISTC_SYMBOL, symlen);
> hists__set_unres_dso_col_len(hists, HISTC_DSO);
> }
>
> + hists__new_col_len(hists, HISTC_SYMBOL, symlen);
> + hists__new_col_len(hists, HISTC_SYMOFF, symlen);
> +
> len = thread__comm_len(h->thread);
> if (hists__new_col_len(hists, HISTC_COMM, len))
> hists__set_col_len(hists, HISTC_THREAD, len + 6);
> diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
> index d0ef9a1..874b203 100644
> --- a/tools/perf/util/hist.h
> +++ b/tools/perf/util/hist.h
> @@ -24,6 +24,7 @@ enum hist_filter {
>
> enum hist_column {
> HISTC_SYMBOL,
> + HISTC_SYMOFF,
> HISTC_DSO,
> HISTC_THREAD,
> HISTC_COMM,
> diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
> index bea2e07..49ad000 100644
> --- a/tools/perf/util/sort.c
> +++ b/tools/perf/util/sort.c
> @@ -280,6 +280,65 @@ struct sort_entry sort_sym = {
> .se_width_idx = HISTC_SYMBOL,
> };
>
> +static int64_t
> +sort__symoff_cmp(struct hist_entry *left, struct hist_entry *right)
> +{
> + return _sort__addr_cmp(left->ip, right->ip);
> +}
> +
> +static int64_t
> +sort__symoff_collapse(struct hist_entry *left, struct hist_entry *right)
> +{
> + struct symbol *sym_l = left->ms.sym;
> + struct symbol *sym_r = right->ms.sym;
> + u64 symoff_l, symoff_r;
> + int64_t ret;
> +
> + if (!sym_l || !sym_r)
> + return cmp_null(sym_l, sym_r);
> +
> + ret = strcmp(sym_r->name, sym_l->name);
> + if (ret)
> + return ret;
> +
> +
> + symoff_l = left->ip - sym_l->start;
> + symoff_r = right->ip - sym_r->start;
> +
> + return (int64_t)(symoff_r - symoff_l);
> +}
> +
> +static int hist_entry__symoff_snprintf(struct hist_entry *he, char *bf,
> + size_t size, unsigned int width)
> +{
> + struct map *map = he->ms.map;
> + struct symbol *sym = he->ms.sym;
> + size_t ret = 0;
> +
> + if (sym) {
> + ret += repsep_snprintf(bf + ret, size - ret, "%s", sym->name);
> + ret += repsep_snprintf(bf + ret, size - ret, "+0x%llx",
> + he->ip - sym->start);
> +
> + } else {
> + size_t len = BITS_PER_LONG / 4;
> +
> + ret += repsep_snprintf(bf + ret, size - ret, "%-#.*llx", len,
> + map ? map->unmap_ip(map, he->ip) : he->ip);
> + }
> +
> + ret += repsep_snprintf(bf + ret, size - ret, "%-*s",
> + width - ret, "");
> + return ret;
> +}
> +
> +struct sort_entry sort_symoff = {
> + .se_header = "Symbol + Offset",
> + .se_cmp = sort__symoff_cmp,
> + .se_snprintf = hist_entry__symoff_snprintf,
> + .se_width_idx = HISTC_SYMOFF,
> +};
> +
> /* --sort srcline */
>
> static int64_t
> @@ -1172,6 +1231,7 @@ static struct sort_dimension common_sort_dimensions[] = {
> DIM(SORT_COMM, "comm", sort_comm),
> DIM(SORT_DSO, "dso", sort_dso),
> DIM(SORT_SYM, "symbol", sort_sym),
> + DIM(SORT_SYMOFF, "symoff", sort_symoff),
> DIM(SORT_PARENT, "parent", sort_parent),
> DIM(SORT_CPU, "cpu", sort_cpu),
> DIM(SORT_SRCLINE, "srcline", sort_srcline),
> @@ -1443,6 +1503,13 @@ int sort_dimension__add(const char *tok)
>
> } else if (sd->entry == &sort_dso) {
> sort__has_dso = 1;
> + } else if (sd->entry == &sort_symoff) {
> + /*
> + * For symoff sort key, not only the offset but also the
> + * symbol name should be compared.
> + */
> + if (sort__mode == SORT_MODE__DIFF)
> + sd->entry->se_collapse = sort__symoff_collapse;
> }
>
> return __sort_dimension__add(sd);
> diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
> index c03e4ff..ea0122f 100644
> --- a/tools/perf/util/sort.h
> +++ b/tools/perf/util/sort.h
> @@ -38,6 +38,7 @@ extern enum sort_mode sort__mode;
> extern struct sort_entry sort_comm;
> extern struct sort_entry sort_dso;
> extern struct sort_entry sort_sym;
> +extern struct sort_entry sort_symoff;
> extern struct sort_entry sort_parent;
> extern struct sort_entry sort_dso_from;
> extern struct sort_entry sort_dso_to;
> @@ -161,6 +162,7 @@ enum sort_type {
> SORT_COMM,
> SORT_DSO,
> SORT_SYM,
> + SORT_SYMOFF,
> SORT_PARENT,
> SORT_CPU,
> SORT_SRCLINE,
> --
> 1.8.3.2
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