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authorLeo Yan <leo.yan@linaro.org>2020-10-14 08:09:20 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2020-10-15 15:34:51 +0300
commit77c158698c395cf127fdc6e0b9699917f72ef47f (patch)
tree2e030a137e5a215fe41d7e8a3ec5349b67917f7f /tools
parented626a3e52cacd324fa1b7c4cc4c252f8f39f4d4 (diff)
downloadlinux-77c158698c395cf127fdc6e0b9699917f72ef47f.tar.xz
perf c2c: Correct LLC load hit metrics
"rmt_hit" is accounted into two metrics: one is accounted into the metrics "LLC Ld Miss" (see the function llc_miss() for calculation "llcmiss"); and it's accounted into metrics "LLC Load Hit". Thus, for the literal meaning, it is contradictory that "rmt_hit" is accounted for both "LLC Ld Miss" (LLC miss) and "LLC Load Hit" (LLC hit). Thus this is easily to introduce confusion: "LLC Load Hit" gives impression that all items belong to it are LLC hit; in fact "rmt_hit" is LLC miss and remote cache hit. To give out clear semantics for metric "LLC Load Hit", "rmt_hit" is moved out from it and changes "LLC Load Hit" to contain two items: LLC Load Hit = LLC's hit ("ld_llchit") + LLC's hitm ("lcl_hitm") For output alignment, adjusts the header for "LLC Load Hit". Signed-off-by: Leo Yan <leo.yan@linaro.org> Tested-by: Joe Mario <jmario@redhat.com> Acked-by: Jiri Olsa <jolsa@redhat.com> Link: https://lore.kernel.org/r/20201014050921.5591-8-leo.yan@linaro.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/builtin-c2c.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
index fd7bfe42a629..bfbcd635cd73 100644
--- a/tools/perf/builtin-c2c.c
+++ b/tools/perf/builtin-c2c.c
@@ -1432,7 +1432,7 @@ static struct c2c_dimension dim_ld_l2hit = {
};
static struct c2c_dimension dim_ld_llchit = {
- .header = HEADER_SPAN("-- LLC Load Hit --", "LclHit", 1),
+ .header = HEADER_SPAN("- LLC Load Hit --", "LclHit", 1),
.name = "ld_lclhit",
.cmp = ld_llchit_cmp,
.entry = ld_llchit_entry,
@@ -2853,7 +2853,7 @@ static int perf_c2c__report(int argc, const char **argv)
"tot_stores,"
"stores_l1hit,stores_l1miss,"
"ld_fbhit,ld_l1hit,ld_l2hit,"
- "ld_lclhit,ld_rmthit,"
+ "ld_lclhit,lcl_hitm,"
"ld_llcmiss,"
"dram_lcl,dram_rmt",
c2c.display == DISPLAY_TOT ? "tot_hitm" :