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Subject[PATCH 50/57] perf c2c report: Add support to choose local HITMs
Date
Currently we sort and limit displayed data based on
the remote HITMs count. Adding support to switch to
local HITMs via --display option:

--display ... lcl,rmt

Link: http://lkml.kernel.org/n/tip-inykbom2f19difvsu1e18avr@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/builtin-c2c.c | 114 +++++++++++++++++++++++++++++++++++++++--------
1 file changed, 95 insertions(+), 19 deletions(-)

diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
index ff89c0b86c44..771991cf6946 100644
--- a/tools/perf/builtin-c2c.c
+++ b/tools/perf/builtin-c2c.c
@@ -63,6 +63,13 @@ struct perf_c2c {
/* HITM shared clines stats */
struct c2c_stats hitm_stats;
int shared_clines;
+
+ int display;
+};
+
+enum {
+ DISPLAY_LCL,
+ DISPLAY_RMT,
};

static struct perf_c2c c2c;
@@ -681,15 +688,24 @@ static double percent_hitm(struct c2c_hist_entry *c2c_he)
struct c2c_hists *hists;
struct c2c_stats *stats;
struct c2c_stats *total;
- int tot, st;
+ int tot = 0, st = 0;
double p;

hists = container_of(c2c_he->he.hists, struct c2c_hists, hists);
stats = &c2c_he->stats;
total = &hists->stats;

- st = stats->rmt_hitm;
- tot = total->rmt_hitm;
+ switch (c2c.display) {
+ case DISPLAY_RMT:
+ st = stats->rmt_hitm;
+ tot = total->rmt_hitm;
+ break;
+ case DISPLAY_LCL:
+ st = stats->lcl_hitm;
+ tot = total->lcl_hitm;
+ default:
+ break;
+ }

p = tot ? (double) st / tot : 0;

@@ -972,14 +988,26 @@ node_entry(struct perf_hpp_fmt *fmt __maybe_unused, struct perf_hpp *hpp,
ret = scnprintf(hpp->buf, hpp->size, "%2d{%2d ", node, num);
advance_hpp(hpp, ret);

+ #define DISPLAY_HITM(__h) \
+ if (c2c_he->stats.__h> 0) { \
+ ret = scnprintf(hpp->buf, hpp->size, "%5.1f%% ", \
+ percent(stats->__h, c2c_he->stats.__h));\
+ } else { \
+ ret = scnprintf(hpp->buf, hpp->size, "%6s ", "n/a"); \
+ }

- if (c2c_he->stats.rmt_hitm > 0) {
- ret = scnprintf(hpp->buf, hpp->size, "%5.1f%% ",
- percent(stats->rmt_hitm, c2c_he->stats.rmt_hitm));
- } else {
- ret = scnprintf(hpp->buf, hpp->size, "%6s ", "n/a");
+ switch (c2c.display) {
+ case DISPLAY_RMT:
+ DISPLAY_HITM(rmt_hitm);
+ break;
+ case DISPLAY_LCL:
+ DISPLAY_HITM(lcl_hitm);
+ default:
+ break;
}

+ #undef DISPLAY_HITM
+
advance_hpp(hpp, ret);

if (c2c_he->stats.store > 0) {
@@ -1255,8 +1283,12 @@ static struct c2c_dimension dim_tot_loads = {
.width = 7,
};

+static struct c2c_header percent_hitm_header[] = {
+ [DISPLAY_LCL] = HEADER_BOTH("Lcl", "Hitm"),
+ [DISPLAY_RMT] = HEADER_BOTH("Rmt", "Hitm"),
+};
+
static struct c2c_dimension dim_percent_hitm = {
- .header = HEADER_LOW("%hitm"),
.name = "percent_hitm",
.cmp = percent_hitm_cmp,
.entry = percent_hitm_entry,
@@ -1648,23 +1680,39 @@ static bool he__display(struct hist_entry *he, struct c2c_stats *stats)

c2c_he = container_of(he, struct c2c_hist_entry, he);

- if (stats->rmt_hitm) {
- ld_dist = ((double)c2c_he->stats.rmt_hitm / stats->rmt_hitm);
- if (ld_dist < DISPLAY_LINE_LIMIT)
- he->filtered = HIST_FILTER__C2C;
- } else {
- he->filtered = HIST_FILTER__C2C;
+#define FILTER_HITM(__h) \
+ if (stats->__h) { \
+ ld_dist = ((double)c2c_he->stats.__h / stats->__h); \
+ if (ld_dist < DISPLAY_LINE_LIMIT) \
+ he->filtered = HIST_FILTER__C2C; \
+ } else { \
+ he->filtered = HIST_FILTER__C2C; \
}

+ switch (c2c.display) {
+ case DISPLAY_LCL:
+ FILTER_HITM(lcl_hitm);
+ break;
+ case DISPLAY_RMT:
+ FILTER_HITM(rmt_hitm);
+ default:
+ break;
+ };
+
+#undef FILTER_HITM
+
return he->filtered == 0;
}

static inline int valid_hitm_or_store(struct hist_entry *he)
{
struct c2c_hist_entry *c2c_he;
+ bool has_hitm;

c2c_he = container_of(he, struct c2c_hist_entry, he);
- return c2c_he->stats.rmt_hitm || c2c_he->stats.store;
+ has_hitm = c2c.display == DISPLAY_LCL ?
+ c2c_he->stats.lcl_hitm : c2c_he->stats.rmt_hitm;
+ return has_hitm || c2c_he->stats.store;
}

static int filter_cb(struct hist_entry *he)
@@ -1945,6 +1993,8 @@ static void print_c2c_info(FILE *out, struct perf_session *session)
perf_evsel__name(evsel));
first = false;
}
+ fprintf(out, " Cachelines sort on : %s HITMs\n",
+ c2c.display == DISPLAY_LCL ? "Local" : "Remote");
}

static void perf_c2c__hists_fprintf(FILE *out, struct perf_session *session)
@@ -2077,8 +2127,10 @@ static int perf_c2c_browser__title(struct hist_browser *browser,
char *bf, size_t size)
{
scnprintf(bf, size,
- "Shared Data Cache Line Table "
- "(%lu entries)", browser->nr_non_filtered_entries);
+ "Shared Data Cache Line Table "
+ "(%lu entries, sorted on %s HITMs)",
+ browser->nr_non_filtered_entries,
+ c2c.display == DISPLAY_LCL ? "local" : "remote");
return 0;
}

@@ -2150,6 +2202,8 @@ static void ui_quirks(void)
dim_offset.width = 5;
dim_offset.header = header_offset_tui;
}
+
+ dim_percent_hitm.header = percent_hitm_header[c2c.display];
}

#define CALLCHAIN_DEFAULT_OPT "graph,0.5,caller,function,percent"
@@ -2204,6 +2258,22 @@ static int setup_callchain(struct perf_evlist *evlist)
return 0;
}

+static int setup_display(const char *str)
+{
+ const char *display = str ?: "rmt";
+
+ if (!strcmp(display, "rmt"))
+ c2c.display = DISPLAY_RMT;
+ else if (!strcmp(display, "lcl"))
+ c2c.display = DISPLAY_LCL;
+ else {
+ pr_err("failed: unknown display type: %s\n", str);
+ return -1;
+ }
+
+ return 0;
+}
+
static int perf_c2c__report(int argc, const char **argv)
{
struct perf_session *session;
@@ -2212,6 +2282,7 @@ static int perf_c2c__report(int argc, const char **argv)
.mode = PERF_DATA_MODE_READ,
};
char callchain_default_opt[] = CALLCHAIN_DEFAULT_OPT;
+ const char *display = NULL;
const struct option c2c_options[] = {
OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
"file", "vmlinux pathname"),
@@ -2230,6 +2301,7 @@ static int perf_c2c__report(int argc, const char **argv)
"print_type,threshold[,print_limit],order,sort_key[,branch],value",
callchain_help, &parse_callchain_opt,
callchain_default_opt),
+ OPT_STRING('d', "display", &display, NULL, "lcl,rmt"),
OPT_END()
};
int err = 0;
@@ -2254,6 +2326,10 @@ static int perf_c2c__report(int argc, const char **argv)

file.path = input_name;

+ err = setup_display(display);
+ if (err)
+ goto out;
+
err = c2c_hists__init(&c2c.hists, "dcacheline", 2);
if (err) {
pr_debug("Failed to initialize hists\n");
@@ -2301,7 +2377,7 @@ static int perf_c2c__report(int argc, const char **argv)
"tot_loads,"
"ld_fbhit,ld_l1hit,ld_l2hit,"
"ld_lclhit,ld_rmthit",
- "rmt_hitm"
+ c2c.display == DISPLAY_LCL ? "lcl_hitm" : "rmt_hitm"
);

ui_progress__init(&prog, c2c.hists.hists.nr_entries, "Sorting...");
--
2.7.4
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