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| author | Leo Yan <leo.yan@linaro.org> | 2020-10-14 08:09:20 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-10-15 15:34:51 +0300 |
| commit | 77c158698c395cf127fdc6e0b9699917f72ef47f (patch) | |
| tree | 2e030a137e5a215fe41d7e8a3ec5349b67917f7f /tools/perf | |
| parent | ed626a3e52cacd324fa1b7c4cc4c252f8f39f4d4 (diff) | |
| download | linux-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/perf')
| -rw-r--r-- | tools/perf/builtin-c2c.c | 4 |
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" : |