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
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@lkp-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@lkp-csl-2ap4 ~# ./perf stat -a -I 1000 -e llc_misses.mem_read --per-die -- sleep 5
1.001586691 S0-D0 1 1229440 Bytes llc_misses.mem_read
1.001586691 S0-D1 1 976832 Bytes llc_misses.mem_read
1.001586691 S1-D0 1 938304 Bytes llc_misses.mem_read
1.001586691 S1-D1 1 1227328 Bytes llc_misses.mem_read
2.003776312 S0-D0 1 1586752 Bytes llc_misses.mem_read
2.003776312 S0-D1 1 875392 Bytes llc_misses.mem_read
2.003776312 S1-D0 1 855616 Bytes llc_misses.mem_read
2.003776312 S1-D1 1 949376 Bytes llc_misses.mem_read
3.006512788 S0-D0 1 1338880 Bytes llc_misses.mem_read
3.006512788 S0-D1 1 920064 Bytes llc_misses.mem_read
3.006512788 S1-D0 1 877184 Bytes llc_misses.mem_read
3.006512788 S1-D1 1 1020736 Bytes llc_misses.mem_read
4.008895291 S0-D0 1 926592 Bytes llc_misses.mem_read
4.008895291 S0-D1 1 906368 Bytes llc_misses.mem_read
4.008895291 S1-D0 1 892224 Bytes llc_misses.mem_read
4.008895291 S1-D1 1 987712 Bytes llc_misses.mem_read
5.001590993 S0-D0 1 962624 Bytes llc_misses.mem_read
5.001590993 S0-D1 1 912512 Bytes llc_misses.mem_read
5.001590993 S1-D0 1 891200 Bytes llc_misses.mem_read
5.001590993 S1-D1 1 978432 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 <[email protected]>
Signed-off-by: Jin Yao <[email protected]>
---
v6:
Fix the perf test python failure by adding hashmap.c to python-ext-sources.
root@kbl-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 | 38 +++++++++++++++++++++++++-----
4 files changed, 38 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/python-ext-sources b/tools/perf/util/python-ext-sources
index a9d9c142eb7c..266874913dbb 100644
--- a/tools/perf/util/python-ext-sources
+++ b/tools/perf/util/python-ext-sources
@@ -35,3 +35,4 @@ 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 8ce1479c98f0..ed6e42ddd780 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)
@@ -276,15 +277,27 @@ 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());
+ hashmap__clear(counter->per_pkg_mask);
+}
+
+static size_t pkg_id_hash(const void *key, void *ctx __maybe_unused)
+{
+ return (int64_t)key & 0xffffffff;
+}
+
+static bool pkg_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 = 0;
+ uint64_t key;
*skip = false;
@@ -295,7 +308,7 @@ 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 +330,21 @@ 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 = (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
On Thu, Jan 14, 2021 at 09:27:55AM +0800, Jin Yao wrote:
SNIP
> 2.003776312 S1-D0 1 855616 Bytes llc_misses.mem_read
> 2.003776312 S1-D1 1 949376 Bytes llc_misses.mem_read
> 3.006512788 S0-D0 1 1338880 Bytes llc_misses.mem_read
> 3.006512788 S0-D1 1 920064 Bytes llc_misses.mem_read
> 3.006512788 S1-D0 1 877184 Bytes llc_misses.mem_read
> 3.006512788 S1-D1 1 1020736 Bytes llc_misses.mem_read
> 4.008895291 S0-D0 1 926592 Bytes llc_misses.mem_read
> 4.008895291 S0-D1 1 906368 Bytes llc_misses.mem_read
> 4.008895291 S1-D0 1 892224 Bytes llc_misses.mem_read
> 4.008895291 S1-D1 1 987712 Bytes llc_misses.mem_read
> 5.001590993 S0-D0 1 962624 Bytes llc_misses.mem_read
> 5.001590993 S0-D1 1 912512 Bytes llc_misses.mem_read
> 5.001590993 S1-D0 1 891200 Bytes llc_misses.mem_read
> 5.001590993 S1-D1 1 978432 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 <[email protected]>
> Signed-off-by: Jin Yao <[email protected]>
> ---
> v6:
> Fix the perf test python failure by adding hashmap.c to python-ext-sources.
>
> root@kbl-ppc:~# ./perf test python
> 19: 'import perf' in python : Ok
Acked-by: Jiri Olsa <[email protected]>
thanks,
jirka
Em Thu, Jan 14, 2021 at 08:00:32PM +0100, Jiri Olsa escreveu:
> On Thu, Jan 14, 2021 at 09:27:55AM +0800, Jin Yao wrote:
>
> SNIP
>
> > 2.003776312 S1-D0 1 855616 Bytes llc_misses.mem_read
> > 2.003776312 S1-D1 1 949376 Bytes llc_misses.mem_read
> > 3.006512788 S0-D0 1 1338880 Bytes llc_misses.mem_read
> > 3.006512788 S0-D1 1 920064 Bytes llc_misses.mem_read
> > 3.006512788 S1-D0 1 877184 Bytes llc_misses.mem_read
> > 3.006512788 S1-D1 1 1020736 Bytes llc_misses.mem_read
> > 4.008895291 S0-D0 1 926592 Bytes llc_misses.mem_read
> > 4.008895291 S0-D1 1 906368 Bytes llc_misses.mem_read
> > 4.008895291 S1-D0 1 892224 Bytes llc_misses.mem_read
> > 4.008895291 S1-D1 1 987712 Bytes llc_misses.mem_read
> > 5.001590993 S0-D0 1 962624 Bytes llc_misses.mem_read
> > 5.001590993 S0-D1 1 912512 Bytes llc_misses.mem_read
> > 5.001590993 S1-D0 1 891200 Bytes llc_misses.mem_read
> > 5.001590993 S1-D1 1 978432 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 <[email protected]>
> > Signed-off-by: Jin Yao <[email protected]>
> > ---
> > v6:
> > Fix the perf test python failure by adding hashmap.c to python-ext-sources.
> >
> > root@kbl-ppc:~# ./perf test python
> > 19: 'import perf' in python : Ok
>
> Acked-by: Jiri Olsa <[email protected]>
Jin, this is breaking the build in some 32-bit system, can you please
take a look to validate these warnings?
CC /tmp/build/perf/util/srcline.o
util/stat.c: In function 'pkg_id_hash':
util/stat.c:285:9: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
return (int64_t)key & 0xffffffff;
^
util/stat.c: In function 'pkg_id_equal':
util/stat.c:291:9: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
return (int64_t)key1 == (int64_t)key2;
^
util/stat.c:291:26: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
return (int64_t)key1 == (int64_t)key2;
^
util/stat.c: In function 'check_per_pkg':
util/stat.c:342:26: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
if (hashmap__find(mask, (void *)key, NULL))
^
util/stat.c:345:28: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
ret = hashmap__add(mask, (void *)key, (void *)1);
^
CC /tmp/build/perf/tests/expand-cgroup.o
Em Fri, Jan 15, 2021 at 05:28:14PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Thu, Jan 14, 2021 at 08:00:32PM +0100, Jiri Olsa escreveu:
> > On Thu, Jan 14, 2021 at 09:27:55AM +0800, Jin Yao wrote:
> >
> > SNIP
> >
> > > 2.003776312 S1-D0 1 855616 Bytes llc_misses.mem_read
> > > 2.003776312 S1-D1 1 949376 Bytes llc_misses.mem_read
> > > 3.006512788 S0-D0 1 1338880 Bytes llc_misses.mem_read
> > > 3.006512788 S0-D1 1 920064 Bytes llc_misses.mem_read
> > > 3.006512788 S1-D0 1 877184 Bytes llc_misses.mem_read
> > > 3.006512788 S1-D1 1 1020736 Bytes llc_misses.mem_read
> > > 4.008895291 S0-D0 1 926592 Bytes llc_misses.mem_read
> > > 4.008895291 S0-D1 1 906368 Bytes llc_misses.mem_read
> > > 4.008895291 S1-D0 1 892224 Bytes llc_misses.mem_read
> > > 4.008895291 S1-D1 1 987712 Bytes llc_misses.mem_read
> > > 5.001590993 S0-D0 1 962624 Bytes llc_misses.mem_read
> > > 5.001590993 S0-D1 1 912512 Bytes llc_misses.mem_read
> > > 5.001590993 S1-D0 1 891200 Bytes llc_misses.mem_read
> > > 5.001590993 S1-D1 1 978432 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 <[email protected]>
> > > Signed-off-by: Jin Yao <[email protected]>
> > > ---
> > > v6:
> > > Fix the perf test python failure by adding hashmap.c to python-ext-sources.
> > >
> > > root@kbl-ppc:~# ./perf test python
> > > 19: 'import perf' in python : Ok
> >
> > Acked-by: Jiri Olsa <[email protected]>
>
> Jin, this is breaking the build in some 32-bit system, can you please
> take a look to validate these warnings?
One such system:
28 13.75 debian:experimental-x-mipsel : FAIL mipsel-linux-gnu-gcc (Debian 10.2.1-3) 10.2.1 20201224
> CC /tmp/build/perf/util/srcline.o
> util/stat.c: In function 'pkg_id_hash':
> util/stat.c:285:9: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
> return (int64_t)key & 0xffffffff;
> ^
> util/stat.c: In function 'pkg_id_equal':
> util/stat.c:291:9: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
> return (int64_t)key1 == (int64_t)key2;
> ^
> util/stat.c:291:26: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
> return (int64_t)key1 == (int64_t)key2;
> ^
> util/stat.c: In function 'check_per_pkg':
> util/stat.c:342:26: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
> if (hashmap__find(mask, (void *)key, NULL))
> ^
> util/stat.c:345:28: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
> ret = hashmap__add(mask, (void *)key, (void *)1);
> ^
> CC /tmp/build/perf/tests/expand-cgroup.o
--
- Arnaldo
Hi Arnaldo, Jiri,
On 1/16/2021 4:31 AM, Arnaldo Carvalho de Melo wrote:
> Em Fri, Jan 15, 2021 at 05:28:14PM -0300, Arnaldo Carvalho de Melo escreveu:
>> Em Thu, Jan 14, 2021 at 08:00:32PM +0100, Jiri Olsa escreveu:
>>> On Thu, Jan 14, 2021 at 09:27:55AM +0800, Jin Yao wrote:
>>>
>>> SNIP
>>>
>>>> 2.003776312 S1-D0 1 855616 Bytes llc_misses.mem_read
>>>> 2.003776312 S1-D1 1 949376 Bytes llc_misses.mem_read
>>>> 3.006512788 S0-D0 1 1338880 Bytes llc_misses.mem_read
>>>> 3.006512788 S0-D1 1 920064 Bytes llc_misses.mem_read
>>>> 3.006512788 S1-D0 1 877184 Bytes llc_misses.mem_read
>>>> 3.006512788 S1-D1 1 1020736 Bytes llc_misses.mem_read
>>>> 4.008895291 S0-D0 1 926592 Bytes llc_misses.mem_read
>>>> 4.008895291 S0-D1 1 906368 Bytes llc_misses.mem_read
>>>> 4.008895291 S1-D0 1 892224 Bytes llc_misses.mem_read
>>>> 4.008895291 S1-D1 1 987712 Bytes llc_misses.mem_read
>>>> 5.001590993 S0-D0 1 962624 Bytes llc_misses.mem_read
>>>> 5.001590993 S0-D1 1 912512 Bytes llc_misses.mem_read
>>>> 5.001590993 S1-D0 1 891200 Bytes llc_misses.mem_read
>>>> 5.001590993 S1-D1 1 978432 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 <[email protected]>
>>>> Signed-off-by: Jin Yao <[email protected]>
>>>> ---
>>>> v6:
>>>> Fix the perf test python failure by adding hashmap.c to python-ext-sources.
>>>>
>>>> root@kbl-ppc:~# ./perf test python
>>>> 19: 'import perf' in python : Ok
>>>
>>> Acked-by: Jiri Olsa <[email protected]>
>>
>> Jin, this is breaking the build in some 32-bit system, can you please
>> take a look to validate these warnings?
>
> One such system:
>
> 28 13.75 debian:experimental-x-mipsel : FAIL mipsel-linux-gnu-gcc (Debian 10.2.1-3) 10.2.1 20201224
>
>
>> CC /tmp/build/perf/util/srcline.o
>> util/stat.c: In function 'pkg_id_hash':
>> util/stat.c:285:9: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
>> return (int64_t)key & 0xffffffff;
>> ^
>> util/stat.c: In function 'pkg_id_equal':
>> util/stat.c:291:9: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
>> return (int64_t)key1 == (int64_t)key2;
>> ^
>> util/stat.c:291:26: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
>> return (int64_t)key1 == (int64_t)key2;
>> ^
>> util/stat.c: In function 'check_per_pkg':
>> util/stat.c:342:26: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
>> if (hashmap__find(mask, (void *)key, NULL))
>> ^
>> util/stat.c:345:28: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
>> ret = hashmap__add(mask, (void *)key, (void *)1);
>> ^
>> CC /tmp/build/perf/tests/expand-cgroup.o
>
Thanks for reporting this build issue on 32 bit system.
In v7, I use size_t to replace uint64_t and change the hash key to 'die_id << 16 | socket_id'. I
assume that 16 bits is enough for socket id, is it true? But if it's not true, we have to use a more
complicated way such as allocate a structure which has die_id and socket_id and add it to hashmap.
But I'm not sure if that's necessary because I can't imagine a system which has socket id > 65535.
Thanks
Jin Yao