linux-kernel - Re: [PATCH v5 5/5] perf mem: Support mem_lvl

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Date:   Wed, 20 Apr 2022 16:48:23 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     German Gomez <german.gomez@....com>
Cc:     Ali Saidi <alisaidi@...zon.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, acme@...nel.org,
        benh@...nel.crashing.org, Nick.Forrington@....com,
        alexander.shishkin@...ux.intel.com, andrew.kilroy@....com,
        james.clark@....com, john.garry@...wei.com, jolsa@...nel.org,
        kjain@...ux.ibm.com, lihuafei1@...wei.com, mark.rutland@....com,
        mathieu.poirier@...aro.org, mingo@...hat.com, namhyung@...nel.org,
        peterz@...radead.org, will@...nel.org
Subject: Re: [PATCH v5 5/5] perf mem: Support mem_lvl_num in c2c command

On Mon, Apr 11, 2022 at 11:04:28AM +0100, German Gomez wrote:
> 
> On 08/04/2022 20:53, Ali Saidi wrote:
> > In addition to summarizing data encoded in mem_lvl also support data
> > encoded in mem_lvl_num.
> >
> > Since other architectures don't seem to populate the mem_lvl_num field
> > here there shouldn't be a change in functionality.
> >
> > Signed-off-by: Ali Saidi <alisaidi@...zon.com>
> > ---
> >  tools/perf/util/mem-events.c | 11 +++++++----
> >  1 file changed, 7 insertions(+), 4 deletions(-)
> >
> > diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
> > index ed0ab838bcc5..e5e405185498 100644
> > --- a/tools/perf/util/mem-events.c
> > +++ b/tools/perf/util/mem-events.c
> > @@ -485,6 +485,7 @@ int c2c_decode_stats(struct c2c_stats *stats, struct mem_info *mi)
> >  	u64 daddr  = mi->daddr.addr;
> >  	u64 op     = data_src->mem_op;
> >  	u64 lvl    = data_src->mem_lvl;
> > +	u64 lnum   = data_src->mem_lvl_num;
> >  	u64 snoop  = data_src->mem_snoop;
> >  	u64 lock   = data_src->mem_lock;
> >  	u64 blk    = data_src->mem_blk;
> > @@ -527,16 +528,18 @@ do {				\
> >  			if (lvl & P(LVL, UNC)) stats->ld_uncache++;
> >  			if (lvl & P(LVL, IO))  stats->ld_io++;
> >  			if (lvl & P(LVL, LFB)) stats->ld_fbhit++;
> 
> Just for completion, can we also handle LFB as it seems to be being set
> in "/arch/x86/events/intel/ds.c"? (Sorry I missed this in the v4)

With fixing LFB issue pointed by German, the change looks good to me:

Reviewed-by: Leo Yan <leo.yan@...aro.org>

It would be appreciate if x86 or PowerPC maintainers could take a look
for this patch.  Thanks!

Leo

> > -			if (lvl & P(LVL, L1 )) stats->ld_l1hit++;
> > -			if (lvl & P(LVL, L2 )) stats->ld_l2hit++;
> > -			if (lvl & P(LVL, L3 )) {
> > +			if (lvl & P(LVL, L1) || lnum == P(LVLNUM, L1))
> > +				stats->ld_l1hit++;
> > +			if (lvl & P(LVL, L2) || lnum == P(LVLNUM, L2))
> > +				stats->ld_l2hit++;
> > +			if (lvl & P(LVL, L3) || lnum == P(LVLNUM, L3)) {
> >  				if (snoop & P(SNOOP, HITM))
> >  					HITM_INC(lcl_hitm);
> >  				else
> >  					stats->ld_llchit++;
> >  			}
> >  
> > -			if (lvl & P(LVL, LOC_RAM)) {
> > +			if (lvl & P(LVL, LOC_RAM) || lnum == P(LVLNUM, RAM)) {
> >  				stats->lcl_dram++;
> >  				if (snoop & P(SNOOP, HIT))
> >  					stats->ld_shared++;