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Date: Mon, 17 Nov 2014 14:27:36 +0900
From: Namhyung Kim <namhyung@...nel.org>
To: kan.liang@...el.com
Cc: acme@...nel.org, jolsa@...hat.com, linux-kernel@...r.kernel.org,
ak@...ux.intel.com
Subject: Re: [PATCH V2 3/3] perf tool: Add sort key addr for perf diff
On Mon, 10 Nov 2014 16:01:20 -0500, kan liang wrote:
> 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 "addr" key can let the user sort
> differential profile by ips. This feature should only work when the
> perf.data comes from same binary.
I'd like to suggest you to add "symoff" sort key rather than "addr" key.
I think it's better since changes in one function would not affect to
others. It'd look like below..
$ perf report -s comm,dso,symoff
# Overhead Command Shared Object Symbol+Offset
# ........ .............. ................... ...............................
#
25.96% swapper [kernel.kallsyms] [k] intel_idle+0x3c
8.51% kworker/9:0 [kernel.kallsyms] [k] smp_call_function_many+0x1d
6.46% swapper [kernel.kallsyms] [k] idle_enter_fair+0xa0
6.23% Xorg [kernel.kallsyms] [k] add_wait_queue+0x09
6.02% synergys libc-2.17.so [.] malloc+0x21
What do you think?
Thanks,
Namhyung
>
> Signed-off-by: Kan Liang <kan.liang@...el.com>
> ---
> tools/perf/Documentation/perf-diff.txt | 7 +++++--
> tools/perf/builtin-diff.c | 2 +-
> tools/perf/util/hist.c | 5 +++--
> tools/perf/util/hist.h | 1 +
> tools/perf/util/sort.c | 29 +++++++++++++++++++++++++++++
> tools/perf/util/sort.h | 2 ++
> 6 files changed, 41 insertions(+), 5 deletions(-)
>
> diff --git a/tools/perf/Documentation/perf-diff.txt b/tools/perf/Documentation/perf-diff.txt
> index e463caa..400b0ec 100644
> --- a/tools/perf/Documentation/perf-diff.txt
> +++ b/tools/perf/Documentation/perf-diff.txt
> @@ -50,8 +50,11 @@ 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, addr.
> +
> + - addr: 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..b0a06d2 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, addr, ..."
> " 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..f0b3777 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_ADDR, 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..eb4bb7d 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_ADDR,
> HISTC_DSO,
> HISTC_THREAD,
> HISTC_COMM,
> diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
> index ee235ab..604a910 100644
> --- a/tools/perf/util/sort.c
> +++ b/tools/perf/util/sort.c
> @@ -280,6 +280,34 @@ struct sort_entry sort_sym = {
> .se_width_idx = HISTC_SYMBOL,
> };
>
> +static int64_t
> +sort__addr_cmp(struct hist_entry *left, struct hist_entry *right)
> +{
> + return _sort__addr_cmp(left->ip, right->ip);
> +}
> +
> +static int hist_entry__addr_snprintf(struct hist_entry *he, char *bf,
> + size_t size, unsigned int width)
> +{
> + struct map *map = he->ms.map;
> + u64 ip;
> +
> + if (map)
> + ip = map->unmap_ip(map, he->ip);
> + else
> + ip = he->ip;
> +
> + return _hist_entry__sym_snprintf(NULL, NULL, ip,
> + he->level, bf, size, width);
> +}
> +
> +struct sort_entry sort_addr = {
> + .se_header = "Addr",
> + .se_cmp = sort__addr_cmp,
> + .se_snprintf = hist_entry__addr_snprintf,
> + .se_width_idx = HISTC_ADDR,
> +};
> +
> /* --sort srcline */
>
> static int64_t
> @@ -1170,6 +1198,7 @@ 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_ADDR, "addr", sort_addr),
> DIM(SORT_PARENT, "parent", sort_parent),
> DIM(SORT_CPU, "cpu", sort_cpu),
> DIM(SORT_SRCLINE, "srcline", sort_srcline),
> diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
> index c03e4ff..56a7a0f 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_addr;
> 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_ADDR,
> SORT_PARENT,
> SORT_CPU,
> SORT_SRCLINE,
--
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