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Date: Wed, 27 Jan 2021 23:08:27 +0100
From: Jiri Olsa <jolsa@...hat.com>
To: Jin Yao <yao.jin@...ux.intel.com>
Cc: acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
mingo@...hat.com, 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 v8] perf stat: Fix wrong skipping for per-die aggregation
On Tue, Jan 26, 2021 at 07:35:25AM +0800, Jin Yao wrote:
SNIP
> ---
> v8:
> Jiri contributes idea and code to allocate 'uint64_t' type hash key for better
> supporting for 64 bits platform and 32 bits platform. I merge Jiri's code in this
> patch. Thanks Jiri!
>
> Rebase the patch to latest perf/core branch.
>
> v7:
> It reported build error on 32-bit system (such as cross build by mipsel-linux-gnu-gcc).
>
> In v7,
> 1. Use size_t to replace uint64_t.
> 2. The hash key is changed from 'die_id << 32 | socket_id' to 'die_id << 16 | socket_id',
> 16 bits is enough for socket id , right?
>
> v6:
> Fix the perf test python failure by adding hashmap.c to python-ext-sources.
>
> root@...-ppc:~# ./perf test python
> 19: 'import perf' in python : Ok
>
> v5:
> Hash key is changed to die_id << 32 | socket.
> In pkg_id_hash, return (int64_t)key & 0xffffffff; actually it's socket.
>
> v4:
> v3 used unnecessary bool allocatioin. v4 just uses the hash value '(void *)1'.
>
> v4 is compiled ok with tmp.perf/core.
>
> v3:
> Since for some cpumap functions, the return type is changed from 'int' to
> 'struct aggr_cpu_id', the patch needs to be updated as well.
>
> before:
> d = cpu_map__get_die()
>
> after:
> d = cpu_map__get_die().die
>
> v3 is compiled ok with tmp.perf/core.
>
> v2:
> Use hashmap to check the used socket+die pair.
>
> tools/perf/util/evsel.c | 4 ++-
> tools/perf/util/evsel.h | 3 +-
> tools/perf/util/python-ext-sources | 1 +
> tools/perf/util/stat.c | 56 ++++++++++++++++++++++++++----
> 4 files changed, 55 insertions(+), 9 deletions(-)
>
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index 8b18ec56e266..ee9453fb379b 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -46,6 +46,7 @@
> #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>
> @@ -1385,7 +1386,8 @@ void evsel__exit(struct evsel *evsel)
> zfree(&evsel->group_name);
> zfree(&evsel->name);
> zfree(&evsel->pmu_name);
> - zfree(&evsel->per_pkg_mask);
sorry I did not notice before, but I think we need to call
zero_per_pkg in here, otherwise we're leaking keys
jirka
> + 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 e25594494cf6..b413c3ff6fb5 100644
> --- a/tools/perf/util/evsel.h
> +++ b/tools/perf/util/evsel.h
> @@ -19,6 +19,7 @@ struct perf_stat_evsel;
> union perf_event;
> struct bpf_counter_ops;
> struct target;
> +struct hashmap;
>
> typedef int (evsel__sb_cb_t)(union perf_event *event, void *data);
>
> @@ -112,7 +113,7 @@ 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/python-ext-sources b/tools/perf/util/python-ext-sources
> index 71b753523fac..845dd46e3c61 100644
> --- a/tools/perf/util/python-ext-sources
> +++ b/tools/perf/util/python-ext-sources
> @@ -36,3 +36,4 @@ util/symbol_fprintf.c
> util/units.c
> util/affinity.c
> util/rwsem.c
> +util/hashmap.c
> diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
> index 0b3957323f66..0dc78954c335 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 +276,40 @@ 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 *cur;
> + size_t bkt;
> +
> + if (counter->per_pkg_mask) {
> + hashmap__for_each_entry(counter->per_pkg_mask, cur, bkt)
> + free((char *)cur->key);
> +
> + hashmap__clear(counter->per_pkg_mask);
> + }
> +}
> +
> +static size_t pkg_id_hash(const void *__key, void *ctx __maybe_unused)
> +{
> + uint64_t *key = (uint64_t *) __key;
> +
> + return *key & 0xffffffff;
> +}
> +
> +static bool pkg_id_equal(const void *__key1, const void *__key2,
> + void *ctx __maybe_unused)
> +{
> + uint64_t *key1 = (uint64_t *) __key1;
> + uint64_t *key2 = (uint64_t *) __key2;
> +
> + return *key1 == *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 = 0;
> + uint64_t *key;
>
> *skip = false;
>
> @@ -295,7 +320,7 @@ static int check_per_pkg(struct evsel *counter,
> return 0;
>
> if (!mask) {
> - mask = zalloc(cpu__max_cpu());
> + mask = hashmap__new(pkg_id_hash, pkg_id_equal, NULL);
> if (!mask)
> return -ENOMEM;
>
> @@ -317,8 +342,25 @@ static int check_per_pkg(struct evsel *counter,
> if (s < 0)
> return -1;
>
> - *skip = test_and_set_bit(s, mask) == 1;
> - return 0;
> + /*
> + * On multi-die system, die_id > 0. 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).die;
> + if (d < 0)
> + return -1;
> +
> + key = malloc(sizeof(*key));
> + if (!key)
> + return -ENOMEM;
> +
> + *key = (uint64_t)d << 32 | s;
> + if (hashmap__find(mask, (void *)key, NULL))
> + *skip = true;
> + else
> + ret = hashmap__add(mask, (void *)key, (void *)1);
> +
> + return ret;
> }
>
> static int
> --
> 2.17.1
>
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