Re: [PATCH] perf parse-events: Set exclude_guest for user-space counting
On 2020/8/13 15:08, Jin, Yao wrote:
On 8/13/2020 2:57 PM, Like Xu wrote:
Hi Yao,
On 2020/8/13 11:11, Jin, Yao wrote:
Hi Like,
On 8/12/2020 9:02 PM, Like Xu wrote:
On 2020/8/12 20:15, Arnaldo Carvalho de Melo wrote:
Em Wed, Aug 12, 2020 at 02:59:53PM +0800, Jin Yao escreveu:
Currently if we run 'perf record -e cycles:u', exclude_guest is 0.
But it doesn't make sense that we request for user-space counting
but we also get the guest report.
Please hold the horse and allow this possibility.
Some authorized perf users on the host may
only want to count (KVM) guest user space events.
Thanks,
Like Xu
Without this patch, if we don't set the ":u" modifier, exclude_guest = 1.
It's true for the non ":u" case.
perf record -e cycles ./div
perf evlist -v
cycles: size: 120, { sample_period, sample_freq }: 4000, sample_type:
IP|TID|TIME|PERIOD, read_format: ID, disabled: 1, inherit: 1, mmap: 1,
comm: 1, freq: 1, enable_on_exec: 1, task: 1, sample_id_all: 1,
exclude_guest: 1, mmap2: 1, comm_exec: 1, ksymbol: 1, bpf_event: 1
So this patch doesn't change perf's original behavior.
The patch changes the "perf kvm" original behavior.
Testcase: perf kvm --host --guest --guestkallsyms=guest-kallsyms \
--guestmodules=guest-modules record -e cycles:u ...
From:
cycles:u: size: 120, { sample_period, sample_freq }: 4000, sample_type:
IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, inherit: 1,
exclude_kernel: 1, exclude_hv: 1, freq: 1, sample_id_all: 1
dummy:HG: type: 1, size: 120, config: 0x9, { sample_period, sample_freq
}: 4000, sample_type: IP|TID|TIME|ID|CPU|PERIOD, read_format: ID,
inherit: 1, mmap: 1, comm: 1, freq: 1, task: 1, sample_id_all: 1, mmap2:
1, comm_exec: 1, ksymbol: 1, bpf_event: 1
To:
cycles:u: size: 120, { sample_period, sample_freq }: 4000, sample_type:
IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, inherit: 1,
exclude_kernel: 1, exclude_hv: 1, freq: 1, sample_id_all: 1,
exclude_guest: 1
dummy:HG: type: 1, size: 120, config: 0x9, { sample_period, sample_freq
}: 4000, sample_type: IP|TID|TIME|ID|CPU|PERIOD, read_format: ID,
inherit: 1, mmap: 1, comm: 1, freq: 1, task: 1, sample_id_all: 1, mmap2:
1, comm_exec: 1, ksymbol: 1, bpf_event: 1
Thanks,
Like Xu
The behavior is similar as native kernel. The change of exclude_guest (0 ->
1) is expected.
When we have 'exclude_guest: 1' for perf kvm usage,
we may get nothing from guest events.
The perf kvm user couldn't count (KVM) guest
user space events only with your patch.
It's unexpected from the pure ':u' semantics.
On native kernel,
Before:
perf record -e cycles:u ./div
perf evlist -v
cycles:u: ..., exclude_kernel: 1, exclude_hv: 1, ...
After:
perf record -e cycles:u ./div
perf evlist -v
cycles:u: ..., exclude_kernel: 1, exclude_hv: 1, exclude_guest: 1, ...
Thanks
Jin Yao
Thanks
Jin Yao
To keep perf semantics consistent and clear, this patch sets
exclude_guest for user-space counting.
Applied, and also added this, that you should consider doing in the
future (modulo the "Committer testing:" header :) ):
Committer testing:
Before:
# perf record -e cycles:u
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.231 MB perf.data (91 samples) ]
#
# perf evlist -v
cycles:u: size: 120, { sample_period, sample_freq }: 4000,
sample_type: IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1,
inherit: 1, exclude_kernel: 1, exclude_hv: 1, freq: 1, sample_id_all: 1
#
After:
# perf record -e cycles:u
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.263 MB perf.data (403 samples) ]
#
# perf evlist -v
cycles:u: size: 120, { sample_period, sample_freq }: 4000,
sample_type: IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1,
inherit: 1, exclude_kernel: 1, exclude_hv: 1, freq: 1, sample_id_all:
1, exclude_guest: 1
#
I.e. show actual command output before and after that demonstrates the
problem and then the solution.
Signed-off-by: Jin Yao
---
tools/perf/util/parse-events.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/tools/perf/util/parse-events.c
b/tools/perf/util/parse-events.c
index 9f7260e69113..4d809f1fe269 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1794,6 +1794,8 @@ static int get_event_modifier(struct
event_modifier *mod, char *str,
if (*str == 'u') {
if (!exclude)
exclude = eu = ek = eh = 1;
+ if (!exclude_GH)
+ eG = 1;
eu = 0;
} else if (*str == 'k') {
if (!exclude)
--
2.17.1
Re: [PATCH] perf parse-events: Set exclude_guest for user-space counting
On 8/13/2020 2:57 PM, Like Xu wrote:
Hi Yao,
On 2020/8/13 11:11, Jin, Yao wrote:
Hi Like,
On 8/12/2020 9:02 PM, Like Xu wrote:
On 2020/8/12 20:15, Arnaldo Carvalho de Melo wrote:
Em Wed, Aug 12, 2020 at 02:59:53PM +0800, Jin Yao escreveu:
Currently if we run 'perf record -e cycles:u', exclude_guest is 0.
But it doesn't make sense that we request for user-space counting
but we also get the guest report.
Please hold the horse and allow this possibility.
Some authorized perf users on the host may
only want to count (KVM) guest user space events.
Thanks,
Like Xu
Without this patch, if we don't set the ":u" modifier, exclude_guest = 1.
It's true for the non ":u" case.
perf record -e cycles ./div
perf evlist -v
cycles: size: 120, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|PERIOD,
read_format: ID, disabled: 1, inherit: 1, mmap: 1, comm: 1, freq: 1, enable_on_exec: 1, task: 1,
sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1, ksymbol: 1, bpf_event: 1
So this patch doesn't change perf's original behavior.
The patch changes the "perf kvm" original behavior.
Testcase: perf kvm --host --guest --guestkallsyms=guest-kallsyms \
--guestmodules=guest-modules record -e cycles:u ...
From:
cycles:u: size: 120, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|ID|CPU|PERIOD,
read_format: ID, disabled: 1, inherit: 1, exclude_kernel: 1, exclude_hv: 1, freq: 1, sample_id_all: 1
dummy:HG: type: 1, size: 120, config: 0x9, { sample_period, sample_freq }: 4000, sample_type:
IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, inherit: 1, mmap: 1, comm: 1, freq: 1, task: 1,
sample_id_all: 1, mmap2: 1, comm_exec: 1, ksymbol: 1, bpf_event: 1
To:
cycles:u: size: 120, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|ID|CPU|PERIOD,
read_format: ID, disabled: 1, inherit: 1, exclude_kernel: 1, exclude_hv: 1, freq: 1, sample_id_all: 1,
exclude_guest: 1
dummy:HG: type: 1, size: 120, config: 0x9, { sample_period, sample_freq }: 4000, sample_type:
IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, inherit: 1, mmap: 1, comm: 1, freq: 1, task: 1,
sample_id_all: 1, mmap2: 1, comm_exec: 1, ksymbol: 1, bpf_event: 1
Thanks,
Like Xu
The behavior is similar as native kernel. The change of exclude_guest (0 -> 1)
is expected.
On native kernel,
Before:
perf record -e cycles:u ./div
perf evlist -v
cycles:u: ..., exclude_kernel: 1, exclude_hv: 1, ...
After:
perf record -e cycles:u ./div
perf evlist -v
cycles:u: ..., exclude_kernel: 1, exclude_hv: 1, exclude_guest: 1, ...
Thanks
Jin Yao
Thanks
Jin Yao
To keep perf semantics consistent and clear, this patch sets
exclude_guest for user-space counting.
Applied, and also added this, that you should consider doing in the
future (modulo the "Committer testing:" header :) ):
Committer testing:
Before:
# perf record -e cycles:u
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.231 MB perf.data (91 samples) ]
#
# perf evlist -v
cycles:u: size: 120, { sample_period, sample_freq }: 4000, sample_type:
IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, inherit: 1, exclude_kernel: 1,
exclude_hv: 1, freq: 1, sample_id_all: 1
#
After:
# perf record -e cycles:u
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.263 MB perf.data (403 samples) ]
#
# perf evlist -v
cycles:u: size: 120, { sample_period, sample_freq }: 4000, sample_type:
IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, inherit: 1, exclude_kernel: 1,
exclude_hv: 1, freq: 1, sample_id_all: 1, exclude_guest: 1
#
I.e. show actual command output before and after that demonstrates the
problem and then the solution.
Signed-off-by: Jin Yao
---
tools/perf/util/parse-events.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 9f7260e69113..4d809f1fe269 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1794,6 +1794,8 @@ static int get_event_modifier(struct event_modifier *mod,
char *str,
if (*str == 'u') {
if (!exclude)
exclude = eu = ek = eh = 1;
+ if (!exclude_GH)
+ eG = 1;
eu = 0;
} else if (*str == 'k') {
if (!exclude)
--
2.17.1
Re: [PATCH] perf parse-events: Set exclude_guest for user-space counting
Hi Yao,
On 2020/8/13 11:11, Jin, Yao wrote:
Hi Like,
On 8/12/2020 9:02 PM, Like Xu wrote:
On 2020/8/12 20:15, Arnaldo Carvalho de Melo wrote:
Em Wed, Aug 12, 2020 at 02:59:53PM +0800, Jin Yao escreveu:
Currently if we run 'perf record -e cycles:u', exclude_guest is 0.
But it doesn't make sense that we request for user-space counting
but we also get the guest report.
Please hold the horse and allow this possibility.
Some authorized perf users on the host may
only want to count (KVM) guest user space events.
Thanks,
Like Xu
Without this patch, if we don't set the ":u" modifier, exclude_guest = 1.
It's true for the non ":u" case.
perf record -e cycles ./div
perf evlist -v
cycles: size: 120, { sample_period, sample_freq }: 4000, sample_type:
IP|TID|TIME|PERIOD, read_format: ID, disabled: 1, inherit: 1, mmap: 1,
comm: 1, freq: 1, enable_on_exec: 1, task: 1, sample_id_all: 1,
exclude_guest: 1, mmap2: 1, comm_exec: 1, ksymbol: 1, bpf_event: 1
So this patch doesn't change perf's original behavior.
The patch changes the "perf kvm" original behavior.
Testcase: perf kvm --host --guest --guestkallsyms=guest-kallsyms \
--guestmodules=guest-modules record -e cycles:u ...
From:
cycles:u: size: 120, { sample_period, sample_freq }: 4000, sample_type:
IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, inherit: 1,
exclude_kernel: 1, exclude_hv: 1, freq: 1, sample_id_all: 1
dummy:HG: type: 1, size: 120, config: 0x9, { sample_period, sample_freq }:
4000, sample_type: IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, inherit: 1,
mmap: 1, comm: 1, freq: 1, task: 1, sample_id_all: 1, mmap2: 1, comm_exec:
1, ksymbol: 1, bpf_event: 1
To:
cycles:u: size: 120, { sample_period, sample_freq }: 4000, sample_type:
IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, inherit: 1,
exclude_kernel: 1, exclude_hv: 1, freq: 1, sample_id_all: 1,
exclude_guest: 1
dummy:HG: type: 1, size: 120, config: 0x9, { sample_period, sample_freq }:
4000, sample_type: IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, inherit: 1,
mmap: 1, comm: 1, freq: 1, task: 1, sample_id_all: 1, mmap2: 1, comm_exec:
1, ksymbol: 1, bpf_event: 1
Thanks,
Like Xu
Thanks
Jin Yao
To keep perf semantics consistent and clear, this patch sets
exclude_guest for user-space counting.
Applied, and also added this, that you should consider doing in the
future (modulo the "Committer testing:" header :) ):
Committer testing:
Before:
# perf record -e cycles:u
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.231 MB perf.data (91 samples) ]
#
# perf evlist -v
cycles:u: size: 120, { sample_period, sample_freq }: 4000,
sample_type: IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1,
inherit: 1, exclude_kernel: 1, exclude_hv: 1, freq: 1, sample_id_all: 1
#
After:
# perf record -e cycles:u
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.263 MB perf.data (403 samples) ]
#
# perf evlist -v
cycles:u: size: 120, { sample_period, sample_freq }: 4000,
sample_type: IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1,
inherit: 1, exclude_kernel: 1, exclude_hv: 1, freq: 1, sample_id_all: 1,
exclude_guest: 1
#
I.e. show actual command output before and after that demonstrates the
problem and then the solution.
Signed-off-by: Jin Yao
---
tools/perf/util/parse-events.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/tools/perf/util/parse-events.c
b/tools/perf/util/parse-events.c
index 9f7260e69113..4d809f1fe269 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1794,6 +1794,8 @@ static int get_event_modifier(struct
event_modifier *mod, char *str,
if (*str == 'u') {
if (!exclude)
exclude = eu = ek = eh = 1;
+ if (!exclude_GH)
+ eG = 1;
eu = 0;
} else if (*str == 'k') {
if (!exclude)
--
2.17.1
Re: [PATCH] perf parse-events: Set exclude_guest for user-space counting
Hi Arnaldo,
On 8/12/2020 8:55 PM, Arnaldo Carvalho de Melo wrote:
Em Wed, Aug 12, 2020 at 09:15:04AM -0300, Arnaldo Carvalho de Melo escreveu:
Em Wed, Aug 12, 2020 at 02:59:53PM +0800, Jin Yao escreveu:
Currently if we run 'perf record -e cycles:u', exclude_guest is 0.
But it doesn't make sense that we request for user-space counting
but we also get the guest report.
To keep perf semantics consistent and clear, this patch sets
exclude_guest for user-space counting.
Applied, and also added this, that you should consider doing in the
future (modulo the "Committer testing:" header :) ):
Committer testing:
Before:
# perf record -e cycles:u
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.231 MB perf.data (91 samples) ]
#
# perf evlist -v
cycles:u: size: 120, { sample_period, sample_freq }: 4000, sample_type:
IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, inherit: 1,
exclude_kernel: 1, exclude_hv: 1, freq: 1, sample_id_all: 1
#
After:
# perf record -e cycles:u
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.263 MB perf.data (403 samples) ]
#
# perf evlist -v
cycles:u: size: 120, { sample_period, sample_freq }: 4000, sample_type:
IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, inherit: 1,
exclude_kernel: 1, exclude_hv: 1, freq: 1, sample_id_all: 1, exclude_guest: 1
#
Also, please run 'perf test', as this will require changes to some
expected perf_event_attr setups:
[root@quaco ~]# perf test "event definition"
6: Parse event definition strings: FAILED!
[root@quaco ~]#
- Arnaldo
Sorry for the perf test failure! I will post v2 to fix this issue.
Thanks
Jin Yao
Re: [PATCH] perf parse-events: Set exclude_guest for user-space counting
Hi Like,
On 8/12/2020 9:02 PM, Like Xu wrote:
On 2020/8/12 20:15, Arnaldo Carvalho de Melo wrote:
Em Wed, Aug 12, 2020 at 02:59:53PM +0800, Jin Yao escreveu:
Currently if we run 'perf record -e cycles:u', exclude_guest is 0.
But it doesn't make sense that we request for user-space counting
but we also get the guest report.
Please hold the horse and allow this possibility.
Some authorized perf users on the host may
only want to count (KVM) guest user space events.
Thanks,
Like Xu
Without this patch, if we don't set the ":u" modifier, exclude_guest = 1.
perf record -e cycles ./div
perf evlist -v
cycles: size: 120, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|PERIOD,
read_format: ID, disabled: 1, inherit: 1, mmap: 1, comm: 1, freq: 1, enable_on_exec: 1, task: 1,
sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1, ksymbol: 1, bpf_event: 1
So this patch doesn't change perf's original behavior.
Thanks
Jin Yao
To keep perf semantics consistent and clear, this patch sets
exclude_guest for user-space counting.
Applied, and also added this, that you should consider doing in the
future (modulo the "Committer testing:" header :) ):
Committer testing:
Before:
# perf record -e cycles:u
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.231 MB perf.data (91 samples) ]
#
# perf evlist -v
cycles:u: size: 120, { sample_period, sample_freq }: 4000, sample_type:
IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, inherit: 1, exclude_kernel: 1,
exclude_hv: 1, freq: 1, sample_id_all: 1
#
After:
# perf record -e cycles:u
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.263 MB perf.data (403 samples) ]
#
# perf evlist -v
cycles:u: size: 120, { sample_period, sample_freq }: 4000, sample_type:
IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, inherit: 1, exclude_kernel: 1,
exclude_hv: 1, freq: 1, sample_id_all: 1, exclude_guest: 1
#
I.e. show actual command output before and after that demonstrates the
problem and then the solution.
Signed-off-by: Jin Yao
---
tools/perf/util/parse-events.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 9f7260e69113..4d809f1fe269 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1794,6 +1794,8 @@ static int get_event_modifier(struct event_modifier *mod,
char *str,
if (*str == 'u') {
if (!exclude)
exclude = eu = ek = eh = 1;
+ if (!exclude_GH)
+ eG = 1;
eu = 0;
} else if (*str == 'k') {
if (!exclude)
--
2.17.1
Re: [PATCH] perf parse-events: Set exclude_guest for user-space counting
On 2020/8/12 20:15, Arnaldo Carvalho de Melo wrote:
Em Wed, Aug 12, 2020 at 02:59:53PM +0800, Jin Yao escreveu:
Currently if we run 'perf record -e cycles:u', exclude_guest is 0.
But it doesn't make sense that we request for user-space counting
but we also get the guest report.
Please hold the horse and allow this possibility.
Some authorized perf users on the host may
only want to count (KVM) guest user space events.
Thanks,
Like Xu
To keep perf semantics consistent and clear, this patch sets
exclude_guest for user-space counting.
Applied, and also added this, that you should consider doing in the
future (modulo the "Committer testing:" header :) ):
Committer testing:
Before:
# perf record -e cycles:u
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.231 MB perf.data (91 samples) ]
#
# perf evlist -v
cycles:u: size: 120, { sample_period, sample_freq }: 4000, sample_type:
IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, inherit: 1,
exclude_kernel: 1, exclude_hv: 1, freq: 1, sample_id_all: 1
#
After:
# perf record -e cycles:u
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.263 MB perf.data (403 samples) ]
#
# perf evlist -v
cycles:u: size: 120, { sample_period, sample_freq }: 4000, sample_type:
IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, inherit: 1,
exclude_kernel: 1, exclude_hv: 1, freq: 1, sample_id_all: 1, exclude_guest: 1
#
I.e. show actual command output before and after that demonstrates the
problem and then the solution.
Signed-off-by: Jin Yao
---
tools/perf/util/parse-events.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 9f7260e69113..4d809f1fe269 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1794,6 +1794,8 @@ static int get_event_modifier(struct event_modifier *mod,
char *str,
if (*str == 'u') {
if (!exclude)
exclude = eu = ek = eh = 1;
+ if (!exclude_GH)
+ eG = 1;
eu = 0;
} else if (*str == 'k') {
if (!exclude)
--
2.17.1
Re: [PATCH] perf parse-events: Set exclude_guest for user-space counting
Em Wed, Aug 12, 2020 at 09:15:04AM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Wed, Aug 12, 2020 at 02:59:53PM +0800, Jin Yao escreveu:
> > Currently if we run 'perf record -e cycles:u', exclude_guest is 0.
> >
> > But it doesn't make sense that we request for user-space counting
> > but we also get the guest report.
> >
> > To keep perf semantics consistent and clear, this patch sets
> > exclude_guest for user-space counting.
>
> Applied, and also added this, that you should consider doing in the
> future (modulo the "Committer testing:" header :) ):
>
> Committer testing:
>
> Before:
>
> # perf record -e cycles:u
> ^C[ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 1.231 MB perf.data (91 samples) ]
> #
> # perf evlist -v
> cycles:u: size: 120, { sample_period, sample_freq }: 4000, sample_type:
> IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, inherit: 1,
> exclude_kernel: 1, exclude_hv: 1, freq: 1, sample_id_all: 1
>
> #
>
> After:
>
> # perf record -e cycles:u
> ^C[ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 1.263 MB perf.data (403 samples) ]
> #
> # perf evlist -v
> cycles:u: size: 120, { sample_period, sample_freq }: 4000, sample_type:
> IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, inherit: 1,
> exclude_kernel: 1, exclude_hv: 1, freq: 1, sample_id_all: 1, exclude_guest: 1
> #
Also, please run 'perf test', as this will require changes to some
expected perf_event_attr setups:
[root@quaco ~]# perf test "event definition"
6: Parse event definition strings: FAILED!
[root@quaco ~]#
- Arnaldo
Re: [PATCH] perf parse-events: Set exclude_guest for user-space counting
Em Wed, Aug 12, 2020 at 02:59:53PM +0800, Jin Yao escreveu:
> Currently if we run 'perf record -e cycles:u', exclude_guest is 0.
>
> But it doesn't make sense that we request for user-space counting
> but we also get the guest report.
>
> To keep perf semantics consistent and clear, this patch sets
> exclude_guest for user-space counting.
Applied, and also added this, that you should consider doing in the
future (modulo the "Committer testing:" header :) ):
Committer testing:
Before:
# perf record -e cycles:u
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.231 MB perf.data (91 samples) ]
#
# perf evlist -v
cycles:u: size: 120, { sample_period, sample_freq }: 4000, sample_type:
IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, inherit: 1,
exclude_kernel: 1, exclude_hv: 1, freq: 1, sample_id_all: 1
#
After:
# perf record -e cycles:u
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.263 MB perf.data (403 samples) ]
#
# perf evlist -v
cycles:u: size: 120, { sample_period, sample_freq }: 4000, sample_type:
IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, inherit: 1,
exclude_kernel: 1, exclude_hv: 1, freq: 1, sample_id_all: 1, exclude_guest: 1
#
I.e. show actual command output before and after that demonstrates the
problem and then the solution.
> Signed-off-by: Jin Yao
> ---
> tools/perf/util/parse-events.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> index 9f7260e69113..4d809f1fe269 100644
> --- a/tools/perf/util/parse-events.c
> +++ b/tools/perf/util/parse-events.c
> @@ -1794,6 +1794,8 @@ static int get_event_modifier(struct event_modifier
> *mod, char *str,
> if (*str == 'u') {
> if (!exclude)
> exclude = eu = ek = eh = 1;
> + if (!exclude_GH)
> + eG = 1;
> eu = 0;
> } else if (*str == 'k') {
> if (!exclude)
> --
> 2.17.1
>
--
- Arnaldo
[PATCH] perf parse-events: Set exclude_guest for user-space counting
Currently if we run 'perf record -e cycles:u', exclude_guest is 0.
But it doesn't make sense that we request for user-space counting
but we also get the guest report.
To keep perf semantics consistent and clear, this patch sets
exclude_guest for user-space counting.
Signed-off-by: Jin Yao
---
tools/perf/util/parse-events.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 9f7260e69113..4d809f1fe269 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1794,6 +1794,8 @@ static int get_event_modifier(struct event_modifier *mod,
char *str,
if (*str == 'u') {
if (!exclude)
exclude = eu = ek = eh = 1;
+ if (!exclude_GH)
+ eG = 1;
eu = 0;
} else if (*str == 'k') {
if (!exclude)
--
2.17.1
