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Date: Mon, 23 May 2022 09:46:41 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Leo Yan <leo.yan@...aro.org>
Cc: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Like Xu <likexu@...cent.com>, Alyssa Ross <hi@...ssa.is>,
Ian Rogers <irogers@...gle.com>,
Kajol Jain <kjain@...ux.ibm.com>,
Adam Li <adamli@...eremail.onmicrosoft.com>,
Li Huafei <lihuafei1@...wei.com>,
German Gomez <german.gomez@....com>,
James Clark <james.clark@....com>,
Kan Liang <kan.liang@...ux.intel.com>,
Ali Saidi <alisaidi@...zon.com>, Joe Mario <jmario@...hat.com>,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 04/11] perf mem: Add statistics for peer snooping
Em Mon, May 23, 2022 at 09:38:31AM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Wed, May 18, 2022 at 01:57:22PM +0800, Leo Yan escreveu:
> > Since the flag PERF_MEM_SNOOPX_PEER is added to support cache snooping
> > from peer cache line, it can come from a peer core, a peer cluster, or
> > a remote NUMA node.
> >
> > This patch adds statistics for the flag PERF_MEM_SNOOPX_PEER. Note, we
> > take PERF_MEM_SNOOPX_PEER as an affiliated info, it needs to cooperate
> > with cache level statistics. Therefore, we account the load operations
> > for both the cache level's metrics (e.g. ld_l2hit, ld_llchit, etc.) and
> > the metric 'ld_peer' when flag PERF_MEM_SNOOPX_PEER is set.
> >
> > Signed-off-by: Leo Yan <leo.yan@...aro.org>
> > Tested-by: Ali Saidi <alisaidi@...zon.com>
>
> util/mem-events.c: In function ‘c2c_decode_stats’:
> util/mem-events.c:536:17: error: ‘PERF_MEM_SNOOPX_PEER’ undeclared (first use in this function); did you mean ‘PERF_MEM_SNOOPX_FWD’?
So I kept the first three patches:
⬢[acme@...lbox perf]$ git log --oneline -5
12aeaaba087d6d92 (HEAD -> perf/core) perf c2c: Update documentation for store metric 'N/A'
550b4d6f9a7e5ddc perf c2c: Add dimensions for 'N/A' metrics of store operation
9845063710725424 perf mem: Add stats for store operation with no available memory level
508c9fbce0d30da3 perf build: Error for BPF skeletons without LIBBPF
0869331fbaa2c11c Merge remote-tracking branch 'torvalds/master' into perf/core
⬢[acme@...lbox perf]$
With Jiri's ack, now waiting for clarification about the v9 discussion
on the base patchkit.
- Arnaldo
>
> Should I fix this as suggested by the compiler?
>
> 536 | #define P(a, b) PERF_MEM_##a##_##b
> | ^~~~~~~~~
> util/mem-events.c:562:46: note: in expansion of macro ‘P’
> 562 | if (snoopx & P(SNOOPX, PEER))
> | ^
> util/mem-events.c:536:17: note: each undeclared identifier is reported only once for each function it appears in
> 536 | #define P(a, b) PERF_MEM_##a##_##b
> | ^~~~~~~~~
> util/mem-events.c:562:46: note: in expansion of macro ‘P’
> 562 | if (snoopx & P(SNOOPX, PEER))
> | ^
> make[4]: *** [/var/home/acme/git/perf/tools/build/Makefile.build:96: /tmp/build/perf/util/mem-events.o] Error 1
> make[4]: *** Waiting for unfinished jobs....
> LD /tmp/build/perf/util/scripting-engines/perf-in.o
> make[3]: *** [/var/home/acme/git/perf/tools/build/Makefile.build:139: util] Error 2
> make[2]: *** [Makefile.perf:664: /tmp/build/perf/perf-in.o] Error 2
> make[1]: *** [Makefile.perf:240: sub-make] Error 2
> make: *** [Makefile:113: install-bin] Error 2
> make: Leaving directory '/var/home/acme/git/perf/tools/perf'
>
> Performance counter stats for 'make -k BUILD_BPF_SKEL=1 CORESIGHT=1 PYTHON=python3 O=/tmp/build/perf -C tools/perf install-bin':
>
> 31,749,639,340 cycles:u
> 57,052,398,827 instructions:u # 1.80 insn per cycle
>
> 2.123830023 seconds time elapsed
>
> 7.146520000 seconds user
> 1.707080000 seconds sys
>
>
> ⬢[acme@...lbox perf]$
>
> > ---
> > tools/perf/util/mem-events.c | 22 +++++++++++++++++++---
> > tools/perf/util/mem-events.h | 1 +
> > 2 files changed, 20 insertions(+), 3 deletions(-)
> >
> > diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
> > index 5dca1882c284..9de0eb3a1200 100644
> > --- a/tools/perf/util/mem-events.c
> > +++ b/tools/perf/util/mem-events.c
> > @@ -525,6 +525,7 @@ int c2c_decode_stats(struct c2c_stats *stats, struct mem_info *mi)
> > u64 op = data_src->mem_op;
> > u64 lvl = data_src->mem_lvl;
> > u64 snoop = data_src->mem_snoop;
> > + u64 snoopx = data_src->mem_snoopx;
> > u64 lock = data_src->mem_lock;
> > u64 blk = data_src->mem_blk;
> > /*
> > @@ -567,18 +568,28 @@ do { \
> > if (lvl & P(LVL, IO)) stats->ld_io++;
> > if (lvl & P(LVL, LFB)) stats->ld_fbhit++;
> > if (lvl & P(LVL, L1 )) stats->ld_l1hit++;
> > - if (lvl & P(LVL, L2 )) stats->ld_l2hit++;
> > + if (lvl & P(LVL, L2)) {
> > + stats->ld_l2hit++;
> > +
> > + if (snoopx & P(SNOOPX, PEER))
> > + stats->ld_peer++;
> > + }
> > if (lvl & P(LVL, L3 )) {
> > if (snoop & P(SNOOP, HITM))
> > HITM_INC(lcl_hitm);
> > else
> > stats->ld_llchit++;
> > +
> > + if (snoopx & P(SNOOPX, PEER))
> > + stats->ld_peer++;
> > }
> >
> > if (lvl & P(LVL, LOC_RAM)) {
> > stats->lcl_dram++;
> > if (snoop & P(SNOOP, HIT))
> > stats->ld_shared++;
> > + else if (snoopx & P(SNOOPX, PEER))
> > + stats->ld_peer++;
> > else
> > stats->ld_excl++;
> > }
> > @@ -597,10 +608,14 @@ do { \
> > if ((lvl & P(LVL, REM_CCE1)) ||
> > (lvl & P(LVL, REM_CCE2)) ||
> > mrem) {
> > - if (snoop & P(SNOOP, HIT))
> > + if (snoop & P(SNOOP, HIT)) {
> > stats->rmt_hit++;
> > - else if (snoop & P(SNOOP, HITM))
> > + } else if (snoop & P(SNOOP, HITM)) {
> > HITM_INC(rmt_hitm);
> > + } else if (snoopx & P(SNOOPX, PEER)) {
> > + stats->rmt_hit++;
> > + stats->ld_peer++;
> > + }
> > }
> >
> > if ((lvl & P(LVL, MISS)))
> > @@ -661,6 +676,7 @@ void c2c_add_stats(struct c2c_stats *stats, struct c2c_stats *add)
> > stats->ld_l1hit += add->ld_l1hit;
> > stats->ld_l2hit += add->ld_l2hit;
> > stats->ld_llchit += add->ld_llchit;
> > + stats->ld_peer += add->ld_peer;
> > stats->lcl_hitm += add->lcl_hitm;
> > stats->rmt_hitm += add->rmt_hitm;
> > stats->tot_hitm += add->tot_hitm;
> > diff --git a/tools/perf/util/mem-events.h b/tools/perf/util/mem-events.h
> > index 8a8b568baeee..4879b841c841 100644
> > --- a/tools/perf/util/mem-events.h
> > +++ b/tools/perf/util/mem-events.h
> > @@ -75,6 +75,7 @@ struct c2c_stats {
> > u32 ld_l1hit; /* count of loads that hit L1D */
> > u32 ld_l2hit; /* count of loads that hit L2D */
> > u32 ld_llchit; /* count of loads that hit LLC */
> > + u32 ld_peer; /* count of loads that hit peer core or cluster cache */
> > u32 lcl_hitm; /* count of loads with local HITM */
> > u32 rmt_hitm; /* count of loads with remote HITM */
> > u32 tot_hitm; /* count of loads with local and remote HITM */
> > --
> > 2.25.1
>
> --
>
> - Arnaldo
--
- Arnaldo
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