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perf c2c: Fix remote HITM detection for Skylake

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Skylake introduced new mem_remote bit in union perf_mem_data_src [1].
It applies to any other memory level to express Remote unknown level, as
is reported by Skylake.

Adding this extra check to c2c_decode_stats to properly decode remote
HITMs on Skylake.

[1] http://lkml.kernel.org/r/20170816222156.19953-4-andi@firstfloor.org

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Andi Kleen <ak@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Joe Mario <jmario@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20170824085732.28481-1-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2017-08-24 10:57:32 +02:00 • committed by Arnaldo Carvalho de Melo
parent 6bd76b8fab
commit 12c15302dd
1 changed files with 9 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
tools/perf/util/mem-events.c
View file

@ -316,6 +316,11 @@ int c2c_decode_stats(struct c2c_stats *stats, struct mem_info *mi)
u64 lvl = data_src->mem_lvl;
u64 snoop = data_src->mem_snoop;
u64 lock = data_src->mem_lock;
/*
* Skylake might report unknown remote level via this
* bit, consider it when evaluating remote HITMs.
*/
bool mrem = data_src->mem_remote;
int err = 0;
#define HITM_INC(__f) \
@ -361,7 +366,8 @@ do { \
}
if ((lvl & P(LVL, REM_RAM1)) ||
(lvl & P(LVL, REM_RAM2))) {
(lvl & P(LVL, REM_RAM2)) ||
mrem) {
stats->rmt_dram++;
if (snoop & P(SNOOP, HIT))
stats->ld_shared++;
@ -371,7 +377,8 @@ do { \
}
if ((lvl & P(LVL, REM_CCE1)) ||
(lvl & P(LVL, REM_CCE2))) {
(lvl & P(LVL, REM_CCE2)) ||
mrem) {
if (snoop & P(SNOOP, HIT))
stats->rmt_hit++;
else if (snoop & P(SNOOP, HITM))