lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Thu, 24 Dec 2020 10:26:05 -0300 From: Arnaldo Carvalho de Melo <acme@...nel.org> To: Jin Yao <yao.jin@...ux.intel.com> Cc: James Clark <james.clark@....com>, John Garry <john.garry@...wei.com>, Jiri Olsa <jolsa@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>, alexander.shishkin@...ux.intel.com, Linux-kernel@...r.kernel.org, ak@...ux.intel.com, kan.liang@...el.com, yao.jin@...el.com, ying.huang@...el.com Subject: Re: [PATCH v2] perf stat: Fix wrong skipping for per-die aggregation Em Thu, Dec 24, 2020 at 08:54:04PM +0800, Jin Yao escreveu: > Uncore becomes die-scope on Xeon Cascade Lake-AP and perf has supported > --per-die aggregation yet. > > One issue is found in check_per_pkg() for uncore events running on > AP system. On cascade Lake-AP, we have: > > S0-D0 > S0-D1 > S1-D0 > S1-D1 So, I applied a series that refactors the perf stat aggregation code and your patch albeit applying cleanly, doesn't compile: CC /tmp/build/perf/util/topdown.o util/stat.c: In function ‘check_per_pkg’: util/stat.c:348:6: error: incompatible types when assigning to type ‘int’ from type ‘struct aggr_cpu_id’ 348 | d = cpu_map__get_die(cpus, cpu, NULL); | ^~~~~~~~~~~~~~~~ make[4]: *** [/home/acme/git/perf/tools/build/Makefile.build:97: /tmp/build/perf/util/stat.o] Error 1 make[4]: *** Waiting for unfinished jobs.... I'm still testing this to push publicly to my perf/core branch, but I'll push now to tmp.perf/core and you can go from there, ok? This is what you should find there, just pushed: 8d4852b468c38168 (HEAD -> perf/core, five/perf/core) perf stat aggregation: Add separate thread member b993381779da406c perf stat aggregation: Add separate core member ba2ee166d92b2010 perf stat aggregation: Add separate die member 1a270cb6b3cc1866 perf stat aggregation: Add separate socket member fcd83a35dd93b89d perf stat aggregation: Add separate node member ff5232956e074994 perf stat aggregation: Start using cpu_aggr_id in map d526e1a033e03ec4 perf cpumap: Drop in cpu_aggr_map struct cea6575fdccfc062 perf cpumap: Add new map type for aggregation 2760f5a14fe7aa46 perf stat: Replace aggregation ID with a struct fa265e59b81a09fa perf cpumap: Add new struct for cpu aggregation 91585846f105ef2e perf cpumap: Use existing allocator to avoid using malloc 23331eeb731a503a perf tests: Improve topology test to check all aggregation types b27d20ab1c6a1a77 perf tools: Update s390's syscall.tbl copy from the kernel sources c5ef52944a2d8001 perf tools: Update powerpc's syscall.tbl copy from the kernel sources 22ffc3f5598d2a51 perf s390: Move syscall.tbl check into check-headers.sh [acme@...co perf]$ - Arnaldo > But in check_per_pkg(), S0-D1 and S1-D1 are skipped because the > mask bits for S0 and S1 have been set for S0-D0 and S1-D0. It doesn't > check die_id. So the counting for S0-D1 and S1-D1 are set to zero. > That's not correct. > > root@...-csl-2ap4 ~# ./perf stat -a -I 1000 -e llc_misses.mem_read --per-die -- sleep 5 > 1.001460963 S0-D0 1 1317376 Bytes llc_misses.mem_read > 1.001460963 S0-D1 1 998016 Bytes llc_misses.mem_read > 1.001460963 S1-D0 1 970496 Bytes llc_misses.mem_read > 1.001460963 S1-D1 1 1291264 Bytes llc_misses.mem_read > 2.003488021 S0-D0 1 1082048 Bytes llc_misses.mem_read > 2.003488021 S0-D1 1 1919040 Bytes llc_misses.mem_read > 2.003488021 S1-D0 1 890752 Bytes llc_misses.mem_read > 2.003488021 S1-D1 1 2380800 Bytes llc_misses.mem_read > 3.005613270 S0-D0 1 1126080 Bytes llc_misses.mem_read > 3.005613270 S0-D1 1 2898176 Bytes llc_misses.mem_read > 3.005613270 S1-D0 1 870912 Bytes llc_misses.mem_read > 3.005613270 S1-D1 1 3388608 Bytes llc_misses.mem_read > 4.007627598 S0-D0 1 1124608 Bytes llc_misses.mem_read > 4.007627598 S0-D1 1 3884416 Bytes llc_misses.mem_read > 4.007627598 S1-D0 1 921088 Bytes llc_misses.mem_read > 4.007627598 S1-D1 1 4451840 Bytes llc_misses.mem_read > 5.001479927 S0-D0 1 963328 Bytes llc_misses.mem_read > 5.001479927 S0-D1 1 4831936 Bytes llc_misses.mem_read > 5.001479927 S1-D0 1 895104 Bytes llc_misses.mem_read > 5.001479927 S1-D1 1 5496640 Bytes llc_misses.mem_read > > From above output, we can see S0-D1 and S1-D1 don't report the interval > values, they are continued to grow. That's because check_per_pkg() wrongly > decides to use zero counts for S0-D1 and S1-D1. > > So in check_per_pkg(), we should use hashmap(socket,die) to decide if > the cpu counts needs to skip. Only considering socket is not enough. > > Now with this patch, > > root@...-csl-2ap4 ~# ./perf stat -a -I 1000 -e llc_misses.mem_read --per-die -- sleep 5 > 1.001617187 S0-D0 1 952768 Bytes llc_misses.mem_read > 1.001617187 S0-D1 1 849152 Bytes llc_misses.mem_read > 1.001617187 S1-D0 1 854912 Bytes llc_misses.mem_read > 1.001617187 S1-D1 1 948672 Bytes llc_misses.mem_read > 2.004138021 S0-D0 1 1200256 Bytes llc_misses.mem_read > 2.004138021 S0-D1 1 899840 Bytes llc_misses.mem_read > 2.004138021 S1-D0 1 898752 Bytes llc_misses.mem_read > 2.004138021 S1-D1 1 1039424 Bytes llc_misses.mem_read > 3.006463971 S0-D0 1 1029056 Bytes llc_misses.mem_read > 3.006463971 S0-D1 1 894336 Bytes llc_misses.mem_read > 3.006463971 S1-D0 1 905088 Bytes llc_misses.mem_read > 3.006463971 S1-D1 1 1042880 Bytes llc_misses.mem_read > 4.008831441 S0-D0 1 920576 Bytes llc_misses.mem_read > 4.008831441 S0-D1 1 877248 Bytes llc_misses.mem_read > 4.008831441 S1-D0 1 883968 Bytes llc_misses.mem_read > 4.008831441 S1-D1 1 967168 Bytes llc_misses.mem_read > 5.001441349 S0-D0 1 864704 Bytes llc_misses.mem_read > 5.001441349 S0-D1 1 827456 Bytes llc_misses.mem_read > 5.001441349 S1-D0 1 829632 Bytes llc_misses.mem_read > 5.001441349 S1-D1 1 925760 Bytes llc_misses.mem_read > > On no-die system, die_id is 0, actually it's hashmap(socket,0), original behavior > is not changed. > > Reported-by: Huang Ying <ying.huang@...el.com> > Signed-off-by: Jin Yao <yao.jin@...ux.intel.com> > --- > tools/perf/util/evsel.c | 4 ++- > tools/perf/util/evsel.h | 3 +- > tools/perf/util/stat.c | 61 +++++++++++++++++++++++++++++++++++++---- > 3 files changed, 60 insertions(+), 8 deletions(-) > > diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c > index c26ea82220bd..9715ed9b03f6 100644 > --- a/tools/perf/util/evsel.c > +++ b/tools/perf/util/evsel.c > @@ -45,6 +45,7 @@ > #include "string2.h" > #include "memswap.h" > #include "util.h" > +#include "hashmap.h" > #include "../perf-sys.h" > #include "util/parse-branch-options.h" > #include <internal/xyarray.h> > @@ -1377,7 +1378,8 @@ void evsel__exit(struct evsel *evsel) > zfree(&evsel->group_name); > zfree(&evsel->name); > zfree(&evsel->pmu_name); > - zfree(&evsel->per_pkg_mask); > + hashmap__free(evsel->per_pkg_mask); > + evsel->per_pkg_mask = NULL; > zfree(&evsel->metric_events); > perf_evsel__object.fini(evsel); > } > diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h > index cd1d8dd43199..951628943fd0 100644 > --- a/tools/perf/util/evsel.h > +++ b/tools/perf/util/evsel.h > @@ -17,6 +17,7 @@ struct cgroup; > struct perf_counts; > struct perf_stat_evsel; > union perf_event; > +struct hashmap; > > typedef int (evsel__sb_cb_t)(union perf_event *event, void *data); > > @@ -110,7 +111,7 @@ struct evsel { > bool merged_stat; > bool reset_group; > bool errored; > - unsigned long *per_pkg_mask; > + struct hashmap *per_pkg_mask; > struct evsel *leader; > struct list_head config_terms; > int err; > diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c > index 1e125e39ff84..15db4bda1266 100644 > --- a/tools/perf/util/stat.c > +++ b/tools/perf/util/stat.c > @@ -13,6 +13,7 @@ > #include "evlist.h" > #include "evsel.h" > #include "thread_map.h" > +#include "hashmap.h" > #include <linux/zalloc.h> > > void update_stats(struct stats *stats, u64 val) > @@ -275,16 +276,39 @@ void evlist__save_aggr_prev_raw_counts(struct evlist *evlist) > > static void zero_per_pkg(struct evsel *counter) > { > - if (counter->per_pkg_mask) > - memset(counter->per_pkg_mask, 0, cpu__max_cpu()); > + struct hashmap_entry *entry; > + size_t bkt; > + > + if (counter->per_pkg_mask) { > + hashmap__for_each_entry(counter->per_pkg_mask, entry, bkt) { > + bool *used = (bool *)entry->value; > + > + *used = false; > + } > + } > +} > + > +static size_t id_hash(const void *key, void *ctx __maybe_unused) > +{ > + int socket = (int64_t)key >> 32; > + > + return socket; > +} > + > +static bool id_equal(const void *key1, const void *key2, > + void *ctx __maybe_unused) > +{ > + return (int64_t)key1 == (int64_t)key2; > } > > static int check_per_pkg(struct evsel *counter, > struct perf_counts_values *vals, int cpu, bool *skip) > { > - unsigned long *mask = counter->per_pkg_mask; > + struct hashmap *mask = counter->per_pkg_mask; > struct perf_cpu_map *cpus = evsel__cpus(counter); > - int s; > + int s, d, ret; > + uint64_t key; > + bool *used; > > *skip = false; > > @@ -295,7 +319,7 @@ static int check_per_pkg(struct evsel *counter, > return 0; > > if (!mask) { > - mask = zalloc(cpu__max_cpu()); > + mask = hashmap__new(id_hash, id_equal, NULL); > if (!mask) > return -ENOMEM; > > @@ -317,7 +341,32 @@ static int check_per_pkg(struct evsel *counter, > if (s < 0) > return -1; > > - *skip = test_and_set_bit(s, mask) == 1; > + /* > + * On multi-die system, 0 < die_id < 256. On no-die system, die_id = 0. > + * We use hashmap(socket, die) to check the used socket+die pair. > + */ > + d = cpu_map__get_die(cpus, cpu, NULL); > + if (d < 0) > + return -1; > + > + key = (uint64_t)s << 32 | (d & 0xff); > + if (hashmap__find(mask, (void *)key, (void **)&used)) { > + if (*used) > + *skip = true; > + *used = true; > + } else { > + used = zalloc(sizeof(*used)); > + if (!used) > + return -1; > + > + *used = true; > + ret = hashmap__add(mask, (void *)key, used); > + if (ret) { > + free(used); > + return -1; > + } > + } > + > return 0; > } > > -- > 2.17.1 > -- - Arnaldo
Powered by blists - more mailing lists