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/[email protected] Cc: Joe Mario <[email protected]> Signed-off-by: Jiri Olsa <[email protected]> --- tools/perf/util/mem-events.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c index ced4f3fff035..28afe5fa84d6 100644 --- a/tools/perf/util/mem-events.c +++ b/tools/perf/util/mem-events.c @@ -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)) -- 2.9.5
