Re: [PATCH v3 1/3] perf: add PERF_RECORD_NAMESPACES to include namespaces related info

2016-12-13 Thread Eric W. Biederman 
Hari Bathini  writes:

> Hi Eric,
>
>
> On Monday 12 December 2016 11:57 PM, Eric W. Biederman wrote:
>> Hari Bathini  writes:
>>
>>> With the advert of container technologies like docker, that depend
>>> on namespaces for isolation, there is a need for tracing support for
>>> namespaces. This patch introduces new PERF_RECORD_NAMESPACES event
>>> for tracing based on namespaces related info.
>>> diff --git a/include/uapi/linux/perf_event.h 
>>> b/include/uapi/linux/perf_event.h
>>> index c66a485..2a48fc6 100644
>>> --- a/include/uapi/linux/perf_event.h
>>> +++ b/include/uapi/linux/perf_event.h
>>> @@ -344,7 +344,8 @@ struct perf_event_attr {
>>> use_clockid:  1, /* use @clockid for time 
>>> fields */
>>> context_switch :  1, /* context switch data */
>>> write_backward :  1, /* Write ring buffer from 
>>> end to beginning */
>>> -   __reserved_1   : 36;
>>> +   namespaces :  1, /* include namespaces data 
>>> */
>>> +   __reserved_1   : 35;
>>> union {
>>> __u32   wakeup_events;/* wakeup every n events */
>>> @@ -610,6 +611,18 @@ struct perf_event_header {
>>> __u16   size;
>>>   };
>>>   +enum {
>>> +   NET_NS_INDEX= 0,
>>> +   UTS_NS_INDEX= 1,
>>> +   IPC_NS_INDEX= 2,
>>> +   PID_NS_INDEX= 3,
>>> +   USER_NS_INDEX   = 4,
>>> +   MNT_NS_INDEX= 5,
>>> +   CGROUP_NS_INDEX = 6,
>>> +
>>> +   NAMESPACES_MAX, /* maximum available namespaces */
>>> +};
>>> +
>>>   enum perf_event_type {
>>> /*
>>> @@ -862,6 +875,18 @@ enum perf_event_type {
>>>  */
>>> PERF_RECORD_SWITCH_CPU_WIDE = 15,
>>>   + /*
>>> +* struct {
>>> +*  struct perf_event_headerheader;
>>> +*
>>> +*  u32 pid, tid;
>>> +*  u64 dev_num;
>>> +*  u64 inode_num[NAMESPACES_MAX];
>> There needs to be one device number per inode.  While it is true that
>> today the device number is always the same.  That is not necessarily so.
>> I reserve the right to have the device number vary per namespace
>> so that I don't need to implement a namespace of namespaces.
>>
>> These are st_dev and st_ino of the inode for the namespace.
>
> Do you mean..
>
> st_dev = encode_dev(inode->i_sb->s_dev); ?
> st_ino = inode->i_ino; ?

Yes.  I believe that is how those values make it to user space
during a stat system call.

Eric

Re: [PATCH v3 1/3] perf: add PERF_RECORD_NAMESPACES to include namespaces related info

2016-12-13 Thread Eric W. Biederman 
Hari Bathini  writes:

> Hi Eric,
>
>
> On Monday 12 December 2016 11:57 PM, Eric W. Biederman wrote:
>> Hari Bathini  writes:
>>
>>> With the advert of container technologies like docker, that depend
>>> on namespaces for isolation, there is a need for tracing support for
>>> namespaces. This patch introduces new PERF_RECORD_NAMESPACES event
>>> for tracing based on namespaces related info.
>>> diff --git a/include/uapi/linux/perf_event.h 
>>> b/include/uapi/linux/perf_event.h
>>> index c66a485..2a48fc6 100644
>>> --- a/include/uapi/linux/perf_event.h
>>> +++ b/include/uapi/linux/perf_event.h
>>> @@ -344,7 +344,8 @@ struct perf_event_attr {
>>> use_clockid:  1, /* use @clockid for time 
>>> fields */
>>> context_switch :  1, /* context switch data */
>>> write_backward :  1, /* Write ring buffer from 
>>> end to beginning */
>>> -   __reserved_1   : 36;
>>> +   namespaces :  1, /* include namespaces data 
>>> */
>>> +   __reserved_1   : 35;
>>> union {
>>> __u32   wakeup_events;/* wakeup every n events */
>>> @@ -610,6 +611,18 @@ struct perf_event_header {
>>> __u16   size;
>>>   };
>>>   +enum {
>>> +   NET_NS_INDEX= 0,
>>> +   UTS_NS_INDEX= 1,
>>> +   IPC_NS_INDEX= 2,
>>> +   PID_NS_INDEX= 3,
>>> +   USER_NS_INDEX   = 4,
>>> +   MNT_NS_INDEX= 5,
>>> +   CGROUP_NS_INDEX = 6,
>>> +
>>> +   NAMESPACES_MAX, /* maximum available namespaces */
>>> +};
>>> +
>>>   enum perf_event_type {
>>> /*
>>> @@ -862,6 +875,18 @@ enum perf_event_type {
>>>  */
>>> PERF_RECORD_SWITCH_CPU_WIDE = 15,
>>>   + /*
>>> +* struct {
>>> +*  struct perf_event_headerheader;
>>> +*
>>> +*  u32 pid, tid;
>>> +*  u64 dev_num;
>>> +*  u64 inode_num[NAMESPACES_MAX];
>> There needs to be one device number per inode.  While it is true that
>> today the device number is always the same.  That is not necessarily so.
>> I reserve the right to have the device number vary per namespace
>> so that I don't need to implement a namespace of namespaces.
>>
>> These are st_dev and st_ino of the inode for the namespace.
>
> Do you mean..
>
> st_dev = encode_dev(inode->i_sb->s_dev); ?
> st_ino = inode->i_ino; ?

Yes.  I believe that is how those values make it to user space
during a stat system call.

Eric

Re: [PATCH v3 1/3] perf: add PERF_RECORD_NAMESPACES to include namespaces related info

2016-12-13 Thread Hari Bathini 

Hi Eric,


On Monday 12 December 2016 11:57 PM, Eric W. Biederman wrote:

Hari Bathini  writes:


With the advert of container technologies like docker, that depend
on namespaces for isolation, there is a need for tracing support for
namespaces. This patch introduces new PERF_RECORD_NAMESPACES event
for tracing based on namespaces related info.
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index c66a485..2a48fc6 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -344,7 +344,8 @@ struct perf_event_attr {
use_clockid:  1, /* use @clockid for time 
fields */
context_switch :  1, /* context switch data */
write_backward :  1, /* Write ring buffer from 
end to beginning */
-   __reserved_1   : 36;
+   namespaces :  1, /* include namespaces data 
*/
+   __reserved_1   : 35;
  
  	union {

__u32   wakeup_events;/* wakeup every n events */
@@ -610,6 +611,18 @@ struct perf_event_header {
__u16   size;
  };
  
+enum {

+   NET_NS_INDEX= 0,
+   UTS_NS_INDEX= 1,
+   IPC_NS_INDEX= 2,
+   PID_NS_INDEX= 3,
+   USER_NS_INDEX   = 4,
+   MNT_NS_INDEX= 5,
+   CGROUP_NS_INDEX = 6,
+
+   NAMESPACES_MAX, /* maximum available namespaces */
+};
+
  enum perf_event_type {
  
  	/*

@@ -862,6 +875,18 @@ enum perf_event_type {
 */
PERF_RECORD_SWITCH_CPU_WIDE = 15,
  
+	/*

+* struct {
+*  struct perf_event_headerheader;
+*
+*  u32 pid, tid;
+*  u64 dev_num;
+*  u64 inode_num[NAMESPACES_MAX];

There needs to be one device number per inode.  While it is true that
today the device number is always the same.  That is not necessarily so.
I reserve the right to have the device number vary per namespace
so that I don't need to implement a namespace of namespaces.

These are st_dev and st_ino of the inode for the namespace.


Do you mean..

st_dev = encode_dev(inode->i_sb->s_dev); ?
st_ino = inode->i_ino; ?

Thanks
Hari

Re: [PATCH v3 1/3] perf: add PERF_RECORD_NAMESPACES to include namespaces related info

2016-12-13 Thread Hari Bathini 

Hi Eric,


On Monday 12 December 2016 11:57 PM, Eric W. Biederman wrote:

Hari Bathini  writes:


With the advert of container technologies like docker, that depend
on namespaces for isolation, there is a need for tracing support for
namespaces. This patch introduces new PERF_RECORD_NAMESPACES event
for tracing based on namespaces related info.
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index c66a485..2a48fc6 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -344,7 +344,8 @@ struct perf_event_attr {
use_clockid:  1, /* use @clockid for time 
fields */
context_switch :  1, /* context switch data */
write_backward :  1, /* Write ring buffer from 
end to beginning */
-   __reserved_1   : 36;
+   namespaces :  1, /* include namespaces data 
*/
+   __reserved_1   : 35;
  
  	union {

__u32   wakeup_events;/* wakeup every n events */
@@ -610,6 +611,18 @@ struct perf_event_header {
__u16   size;
  };
  
+enum {

+   NET_NS_INDEX= 0,
+   UTS_NS_INDEX= 1,
+   IPC_NS_INDEX= 2,
+   PID_NS_INDEX= 3,
+   USER_NS_INDEX   = 4,
+   MNT_NS_INDEX= 5,
+   CGROUP_NS_INDEX = 6,
+
+   NAMESPACES_MAX, /* maximum available namespaces */
+};
+
  enum perf_event_type {
  
  	/*

@@ -862,6 +875,18 @@ enum perf_event_type {
 */
PERF_RECORD_SWITCH_CPU_WIDE = 15,
  
+	/*

+* struct {
+*  struct perf_event_headerheader;
+*
+*  u32 pid, tid;
+*  u64 dev_num;
+*  u64 inode_num[NAMESPACES_MAX];

There needs to be one device number per inode.  While it is true that
today the device number is always the same.  That is not necessarily so.
I reserve the right to have the device number vary per namespace
so that I don't need to implement a namespace of namespaces.

These are st_dev and st_ino of the inode for the namespace.


Do you mean..

st_dev = encode_dev(inode->i_sb->s_dev); ?
st_ino = inode->i_ino; ?

Thanks
Hari

Re: [PATCH v3 1/3] perf: add PERF_RECORD_NAMESPACES to include namespaces related info

2016-12-12 Thread Eric W. Biederman 
Hari Bathini  writes:

> With the advert of container technologies like docker, that depend
> on namespaces for isolation, there is a need for tracing support for
> namespaces. This patch introduces new PERF_RECORD_NAMESPACES event
> for tracing based on namespaces related info.

> diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
> index c66a485..2a48fc6 100644
> --- a/include/uapi/linux/perf_event.h
> +++ b/include/uapi/linux/perf_event.h
> @@ -344,7 +344,8 @@ struct perf_event_attr {
>   use_clockid:  1, /* use @clockid for time 
> fields */
>   context_switch :  1, /* context switch data */
>   write_backward :  1, /* Write ring buffer from 
> end to beginning */
> - __reserved_1   : 36;
> + namespaces :  1, /* include namespaces data 
> */
> + __reserved_1   : 35;
>  
>   union {
>   __u32   wakeup_events;/* wakeup every n events */
> @@ -610,6 +611,18 @@ struct perf_event_header {
>   __u16   size;
>  };
>  
> +enum {
> + NET_NS_INDEX= 0,
> + UTS_NS_INDEX= 1,
> + IPC_NS_INDEX= 2,
> + PID_NS_INDEX= 3,
> + USER_NS_INDEX   = 4,
> + MNT_NS_INDEX= 5,
> + CGROUP_NS_INDEX = 6,
> +
> + NAMESPACES_MAX, /* maximum available namespaces */
> +};
> +
>  enum perf_event_type {
>  
>   /*
> @@ -862,6 +875,18 @@ enum perf_event_type {
>*/
>   PERF_RECORD_SWITCH_CPU_WIDE = 15,
>  
> + /*
> +  * struct {
> +  *  struct perf_event_headerheader;
> +  *
> +  *  u32 pid, tid;
> +  *  u64 dev_num;
> +  *  u64 inode_num[NAMESPACES_MAX];
There needs to be one device number per inode.  While it is true that
today the device number is always the same.  That is not necessarily so.

I reserve the right to have the device number vary per namespace
so that I don't need to implement a namespace of namespaces.

These are st_dev and st_ino of the inode for the namespace.

> +  *  struct sample_idsample_id;
> +  * };
> +  */
> + PERF_RECORD_NAMESPACES  = 16,
> +
>   PERF_RECORD_MAX,/* non-ABI */
>  };

Re: [PATCH v3 1/3] perf: add PERF_RECORD_NAMESPACES to include namespaces related info

2016-12-12 Thread Eric W. Biederman 
Hari Bathini  writes:

> With the advert of container technologies like docker, that depend
> on namespaces for isolation, there is a need for tracing support for
> namespaces. This patch introduces new PERF_RECORD_NAMESPACES event
> for tracing based on namespaces related info.

> diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
> index c66a485..2a48fc6 100644
> --- a/include/uapi/linux/perf_event.h
> +++ b/include/uapi/linux/perf_event.h
> @@ -344,7 +344,8 @@ struct perf_event_attr {
>   use_clockid:  1, /* use @clockid for time 
> fields */
>   context_switch :  1, /* context switch data */
>   write_backward :  1, /* Write ring buffer from 
> end to beginning */
> - __reserved_1   : 36;
> + namespaces :  1, /* include namespaces data 
> */
> + __reserved_1   : 35;
>  
>   union {
>   __u32   wakeup_events;/* wakeup every n events */
> @@ -610,6 +611,18 @@ struct perf_event_header {
>   __u16   size;
>  };
>  
> +enum {
> + NET_NS_INDEX= 0,
> + UTS_NS_INDEX= 1,
> + IPC_NS_INDEX= 2,
> + PID_NS_INDEX= 3,
> + USER_NS_INDEX   = 4,
> + MNT_NS_INDEX= 5,
> + CGROUP_NS_INDEX = 6,
> +
> + NAMESPACES_MAX, /* maximum available namespaces */
> +};
> +
>  enum perf_event_type {
>  
>   /*
> @@ -862,6 +875,18 @@ enum perf_event_type {
>*/
>   PERF_RECORD_SWITCH_CPU_WIDE = 15,
>  
> + /*
> +  * struct {
> +  *  struct perf_event_headerheader;
> +  *
> +  *  u32 pid, tid;
> +  *  u64 dev_num;
> +  *  u64 inode_num[NAMESPACES_MAX];
There needs to be one device number per inode.  While it is true that
today the device number is always the same.  That is not necessarily so.

I reserve the right to have the device number vary per namespace
so that I don't need to implement a namespace of namespaces.

These are st_dev and st_ino of the inode for the namespace.

> +  *  struct sample_idsample_id;
> +  * };
> +  */
> + PERF_RECORD_NAMESPACES  = 16,
> +
>   PERF_RECORD_MAX,/* non-ABI */
>  };

[PATCH v3 1/3] perf: add PERF_RECORD_NAMESPACES to include namespaces related info

2016-12-12 Thread Hari Bathini 
With the advert of container technologies like docker, that depend
on namespaces for isolation, there is a need for tracing support for
namespaces. This patch introduces new PERF_RECORD_NAMESPACES event
for tracing based on namespaces related info.

Signed-off-by: Hari Bathini 
---

Changes from v2:
* Use time value from sample_id.


 include/linux/perf_event.h  |2 +
 include/uapi/linux/perf_event.h |   27 
 kernel/events/core.c|  134 +++
 kernel/fork.c   |3 +
 kernel/nsproxy.c|5 +
 5 files changed, 170 insertions(+), 1 deletion(-)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 4741ecd..42d8aa6 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1110,6 +1110,7 @@ extern int perf_unregister_guest_info_callbacks(struct 
perf_guest_info_callbacks
 
 extern void perf_event_exec(void);
 extern void perf_event_comm(struct task_struct *tsk, bool exec);
+extern void perf_event_namespaces(struct task_struct *tsk);
 extern void perf_event_fork(struct task_struct *tsk);
 
 /* Callchains */
@@ -1312,6 +1313,7 @@ static inline int perf_unregister_guest_info_callbacks
 static inline void perf_event_mmap(struct vm_area_struct *vma) { }
 static inline void perf_event_exec(void)   { }
 static inline void perf_event_comm(struct task_struct *tsk, bool exec) { }
+static inline void perf_event_namespaces(struct task_struct *tsk)  { }
 static inline void perf_event_fork(struct task_struct *tsk){ }
 static inline void perf_event_init(void)   { }
 static inline int  perf_swevent_get_recursion_context(void){ 
return -1; }
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index c66a485..2a48fc6 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -344,7 +344,8 @@ struct perf_event_attr {
use_clockid:  1, /* use @clockid for time 
fields */
context_switch :  1, /* context switch data */
write_backward :  1, /* Write ring buffer from 
end to beginning */
-   __reserved_1   : 36;
+   namespaces :  1, /* include namespaces data 
*/
+   __reserved_1   : 35;
 
union {
__u32   wakeup_events;/* wakeup every n events */
@@ -610,6 +611,18 @@ struct perf_event_header {
__u16   size;
 };
 
+enum {
+   NET_NS_INDEX= 0,
+   UTS_NS_INDEX= 1,
+   IPC_NS_INDEX= 2,
+   PID_NS_INDEX= 3,
+   USER_NS_INDEX   = 4,
+   MNT_NS_INDEX= 5,
+   CGROUP_NS_INDEX = 6,
+
+   NAMESPACES_MAX, /* maximum available namespaces */
+};
+
 enum perf_event_type {
 
/*
@@ -862,6 +875,18 @@ enum perf_event_type {
 */
PERF_RECORD_SWITCH_CPU_WIDE = 15,
 
+   /*
+* struct {
+*  struct perf_event_headerheader;
+*
+*  u32 pid, tid;
+*  u64 dev_num;
+*  u64 inode_num[NAMESPACES_MAX];
+*  struct sample_idsample_id;
+* };
+*/
+   PERF_RECORD_NAMESPACES  = 16,
+
PERF_RECORD_MAX,/* non-ABI */
 };
 
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 02c8421..eb9c812 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -46,6 +46,10 @@
 #include 
 #include 
 #include 
+#include 
+#include 
+#include 
+#include 
 
 #include "internal.h"
 
@@ -375,6 +379,7 @@ static DEFINE_PER_CPU(struct pmu_event_list, pmu_sb_events);
 
 static atomic_t nr_mmap_events __read_mostly;
 static atomic_t nr_comm_events __read_mostly;
+static atomic_t nr_namespaces_events __read_mostly;
 static atomic_t nr_task_events __read_mostly;
 static atomic_t nr_freq_events __read_mostly;
 static atomic_t nr_switch_events __read_mostly;
@@ -3882,6 +3887,8 @@ static void unaccount_event(struct perf_event *event)
atomic_dec(_mmap_events);
if (event->attr.comm)
atomic_dec(_comm_events);
+   if (event->attr.namespaces)
+   atomic_dec(_namespaces_events);
if (event->attr.task)
atomic_dec(_task_events);
if (event->attr.freq)
@@ -6382,6 +6389,7 @@ static void perf_event_task(struct task_struct *task,
 void perf_event_fork(struct task_struct *task)
 {
perf_event_task(task, NULL, 1);
+   perf_event_namespaces(task);
 }
 
 /*
@@ -6484,6 +6492,125 @@ void perf_event_comm(struct task_struct *task, bool 
exec)
 }
 
 /*
+ * namespaces tracking
+ */
+

[PATCH v3 1/3] perf: add PERF_RECORD_NAMESPACES to include namespaces related info

2016-12-12 Thread Hari Bathini 
With the advert of container technologies like docker, that depend
on namespaces for isolation, there is a need for tracing support for
namespaces. This patch introduces new PERF_RECORD_NAMESPACES event
for tracing based on namespaces related info.

Signed-off-by: Hari Bathini 
---

Changes from v2:
* Use time value from sample_id.


 include/linux/perf_event.h  |2 +
 include/uapi/linux/perf_event.h |   27 
 kernel/events/core.c|  134 +++
 kernel/fork.c   |3 +
 kernel/nsproxy.c|5 +
 5 files changed, 170 insertions(+), 1 deletion(-)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 4741ecd..42d8aa6 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1110,6 +1110,7 @@ extern int perf_unregister_guest_info_callbacks(struct 
perf_guest_info_callbacks
 
 extern void perf_event_exec(void);
 extern void perf_event_comm(struct task_struct *tsk, bool exec);
+extern void perf_event_namespaces(struct task_struct *tsk);
 extern void perf_event_fork(struct task_struct *tsk);
 
 /* Callchains */
@@ -1312,6 +1313,7 @@ static inline int perf_unregister_guest_info_callbacks
 static inline void perf_event_mmap(struct vm_area_struct *vma) { }
 static inline void perf_event_exec(void)   { }
 static inline void perf_event_comm(struct task_struct *tsk, bool exec) { }
+static inline void perf_event_namespaces(struct task_struct *tsk)  { }
 static inline void perf_event_fork(struct task_struct *tsk){ }
 static inline void perf_event_init(void)   { }
 static inline int  perf_swevent_get_recursion_context(void){ 
return -1; }
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index c66a485..2a48fc6 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -344,7 +344,8 @@ struct perf_event_attr {
use_clockid:  1, /* use @clockid for time 
fields */
context_switch :  1, /* context switch data */
write_backward :  1, /* Write ring buffer from 
end to beginning */
-   __reserved_1   : 36;
+   namespaces :  1, /* include namespaces data 
*/
+   __reserved_1   : 35;
 
union {
__u32   wakeup_events;/* wakeup every n events */
@@ -610,6 +611,18 @@ struct perf_event_header {
__u16   size;
 };
 
+enum {
+   NET_NS_INDEX= 0,
+   UTS_NS_INDEX= 1,
+   IPC_NS_INDEX= 2,
+   PID_NS_INDEX= 3,
+   USER_NS_INDEX   = 4,
+   MNT_NS_INDEX= 5,
+   CGROUP_NS_INDEX = 6,
+
+   NAMESPACES_MAX, /* maximum available namespaces */
+};
+
 enum perf_event_type {
 
/*
@@ -862,6 +875,18 @@ enum perf_event_type {
 */
PERF_RECORD_SWITCH_CPU_WIDE = 15,
 
+   /*
+* struct {
+*  struct perf_event_headerheader;
+*
+*  u32 pid, tid;
+*  u64 dev_num;
+*  u64 inode_num[NAMESPACES_MAX];
+*  struct sample_idsample_id;
+* };
+*/
+   PERF_RECORD_NAMESPACES  = 16,
+
PERF_RECORD_MAX,/* non-ABI */
 };
 
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 02c8421..eb9c812 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -46,6 +46,10 @@
 #include 
 #include 
 #include 
+#include 
+#include 
+#include 
+#include 
 
 #include "internal.h"
 
@@ -375,6 +379,7 @@ static DEFINE_PER_CPU(struct pmu_event_list, pmu_sb_events);
 
 static atomic_t nr_mmap_events __read_mostly;
 static atomic_t nr_comm_events __read_mostly;
+static atomic_t nr_namespaces_events __read_mostly;
 static atomic_t nr_task_events __read_mostly;
 static atomic_t nr_freq_events __read_mostly;
 static atomic_t nr_switch_events __read_mostly;
@@ -3882,6 +3887,8 @@ static void unaccount_event(struct perf_event *event)
atomic_dec(_mmap_events);
if (event->attr.comm)
atomic_dec(_comm_events);
+   if (event->attr.namespaces)
+   atomic_dec(_namespaces_events);
if (event->attr.task)
atomic_dec(_task_events);
if (event->attr.freq)
@@ -6382,6 +6389,7 @@ static void perf_event_task(struct task_struct *task,
 void perf_event_fork(struct task_struct *task)
 {
perf_event_task(task, NULL, 1);
+   perf_event_namespaces(task);
 }
 
 /*
@@ -6484,6 +6492,125 @@ void perf_event_comm(struct task_struct *task, bool 
exec)
 }
 
 /*
+ * namespaces tracking
+ */
+
+struct namespaces_event_id