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[PATCH v7 8/8] perf record: Unmap overwrite evlist when event terminate

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  [PATCH v7 8/8] perf record: Unmap overwrite evlist when event terminate Wang Nan <wangnan0@huawei.com> - 2016-06-15 04:30 +0200
    Re: [PATCH v7 8/8] perf record: Unmap overwrite evlist when event  terminate Arnaldo Carvalho de Melo <acme@redhat.com> - 2016-06-16 23:00 +0200
      Re: [PATCH v7 8/8] perf record: Unmap overwrite evlist when event  terminate "Wangnan (F)" <wangnan0@huawei.com> - 2016-06-20 10:10 +0200

#1422501 — [PATCH v7 8/8] perf record: Unmap overwrite evlist when event terminate

When see POLLERR or POLLHUP, unmap ring buffer from both the main
evlist and overwrite evlist.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
---
 tools/perf/builtin-record.c | 30 +++++++++++++++++++++---------
 tools/perf/util/evlist.c    |  3 +--
 tools/perf/util/evlist.h    |  2 +-
 3 files changed, 23 insertions(+), 12 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index b9094f0..ca6376c 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -914,6 +914,26 @@ out:
 	return err;
 }
 
+static void record__munmap_filtered(struct fdarray *fda, int fd, void *arg)
+{
+	struct record *rec = (struct record *)arg;
+
+	perf_evlist__mmap_put(rec->evlist, fda->priv[fd].idx);
+	if (rec->overwrite_evlist)
+		perf_evlist__mmap_put(rec->overwrite_evlist, fda->priv[fd].idx);
+}
+
+static int record__filter_pollfd(struct record *rec)
+{
+	/*
+	 * Although we may have auxiliray evlist, there is
+	 * only one pollfd, so we don't need to filter pollfd
+	 * for auxiliray evlist.
+	 */
+	return fdarray__filter(&rec->evlist->pollfd, POLLERR | POLLHUP,
+			       record__munmap_filtered, rec);
+}
+
 static int __cmd_record(struct record *rec, int argc, const char **argv)
 {
 	int err;
@@ -1150,15 +1170,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 				err = 0;
 			waking++;
 
-			/*
-			 * Although we may have auxiliray evlist, there is
-			 * only one pollfd, so we don't need to filter pollfd
-			 * for auxiliray evlist.
-			 *
-			 * TODO: if an event is terminated (POLLERR | POLLHUP),
-			 * unmap mmaps for auxiliray evlist too.
-			 */
-			if (perf_evlist__filter_pollfd(rec->evlist, POLLERR | POLLHUP) == 0)
+			if (record__filter_pollfd(rec) == 0)
 				draining = true;
 		}
 
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index e8fcb22..d43ee81 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -27,7 +27,6 @@
 #include <linux/log2.h>
 #include <linux/err.h>
 
-static void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx);
 static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx);
 
 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
@@ -863,7 +862,7 @@ static void perf_evlist__mmap_get(struct perf_evlist *evlist, int idx)
 	atomic_inc(&evlist->mmap[idx].refcnt);
 }
 
-static void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx)
+void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx)
 {
 	struct perf_mmap *md = &evlist->mmap[idx];
 
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 41e65ac..ba5e006 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -141,7 +141,7 @@ union perf_event *perf_evlist__mmap_read_backward(struct perf_evlist *evlist,
 void perf_evlist__mmap_read_catchup(struct perf_evlist *evlist, int idx);
 
 void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx);
-
+void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx);
 int perf_evlist__pause(struct perf_evlist *evlist);
 int perf_evlist__resume(struct perf_evlist *evlist);
 int perf_evlist__open(struct perf_evlist *evlist);
-- 
1.8.3.4

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#1424394 — Re: [PATCH v7 8/8] perf record: Unmap overwrite evlist when event terminate

Em Wed, Jun 15, 2016 at 02:23:35AM +0000, Wang Nan escreveu:
> When see POLLERR or POLLHUP, unmap ring buffer from both the main
> evlist and overwrite evlist.

When you use an auxiliary evlist this makes evlist->parent be different
than evlist, right? So can't we just hide this from tools and do it all
in perf_evlist__filter_pollfd?

This way we will not need to expose perf_evlist__mmap_put(), etc.

I haven't tried to _actually_ do this, just asking from browsing the
patchkit and with the goal of hiding the internals of this thing inside
evlist.c as much as possible.

- Arnaldo
 
> Signed-off-by: Wang Nan <wangnan0@huawei.com>
> Cc: He Kuang <hekuang@huawei.com>
> Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
> Cc: Jiri Olsa <jolsa@kernel.org>
> Cc: Masami Hiramatsu <mhiramat@kernel.org>
> Cc: Namhyung Kim <namhyung@kernel.org>
> Cc: Zefan Li <lizefan@huawei.com>
> Cc: pi3orama@163.com
> ---
>  tools/perf/builtin-record.c | 30 +++++++++++++++++++++---------
>  tools/perf/util/evlist.c    |  3 +--
>  tools/perf/util/evlist.h    |  2 +-
>  3 files changed, 23 insertions(+), 12 deletions(-)
> 
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index b9094f0..ca6376c 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -914,6 +914,26 @@ out:
>  	return err;
>  }
>  
> +static void record__munmap_filtered(struct fdarray *fda, int fd, void *arg)
> +{
> +	struct record *rec = (struct record *)arg;
> +
> +	perf_evlist__mmap_put(rec->evlist, fda->priv[fd].idx);
> +	if (rec->overwrite_evlist)
> +		perf_evlist__mmap_put(rec->overwrite_evlist, fda->priv[fd].idx);
> +}
> +
> +static int record__filter_pollfd(struct record *rec)
> +{
> +	/*
> +	 * Although we may have auxiliray evlist, there is
> +	 * only one pollfd, so we don't need to filter pollfd
> +	 * for auxiliray evlist.
> +	 */
> +	return fdarray__filter(&rec->evlist->pollfd, POLLERR | POLLHUP,
> +			       record__munmap_filtered, rec);
> +}
> +
>  static int __cmd_record(struct record *rec, int argc, const char **argv)
>  {
>  	int err;
> @@ -1150,15 +1170,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
>  				err = 0;
>  			waking++;
>  
> -			/*
> -			 * Although we may have auxiliray evlist, there is
> -			 * only one pollfd, so we don't need to filter pollfd
> -			 * for auxiliray evlist.
> -			 *
> -			 * TODO: if an event is terminated (POLLERR | POLLHUP),
> -			 * unmap mmaps for auxiliray evlist too.
> -			 */
> -			if (perf_evlist__filter_pollfd(rec->evlist, POLLERR | POLLHUP) == 0)
> +			if (record__filter_pollfd(rec) == 0)
>  				draining = true;
>  		}
>  
> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> index e8fcb22..d43ee81 100644
> --- a/tools/perf/util/evlist.c
> +++ b/tools/perf/util/evlist.c
> @@ -27,7 +27,6 @@
>  #include <linux/log2.h>
>  #include <linux/err.h>
>  
> -static void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx);
>  static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx);
>  
>  #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
> @@ -863,7 +862,7 @@ static void perf_evlist__mmap_get(struct perf_evlist *evlist, int idx)
>  	atomic_inc(&evlist->mmap[idx].refcnt);
>  }
>  
> -static void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx)
> +void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx)
>  {
>  	struct perf_mmap *md = &evlist->mmap[idx];
>  
> diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
> index 41e65ac..ba5e006 100644
> --- a/tools/perf/util/evlist.h
> +++ b/tools/perf/util/evlist.h
> @@ -141,7 +141,7 @@ union perf_event *perf_evlist__mmap_read_backward(struct perf_evlist *evlist,
>  void perf_evlist__mmap_read_catchup(struct perf_evlist *evlist, int idx);
>  
>  void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx);
> -
> +void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx);
>  int perf_evlist__pause(struct perf_evlist *evlist);
>  int perf_evlist__resume(struct perf_evlist *evlist);
>  int perf_evlist__open(struct perf_evlist *evlist);
> -- 
> 1.8.3.4

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#1426304 — Re: [PATCH v7 8/8] perf record: Unmap overwrite evlist when event terminate

On 2016/6/17 4:59, Arnaldo Carvalho de Melo wrote:
> Em Wed, Jun 15, 2016 at 02:23:35AM +0000, Wang Nan escreveu:
>> When see POLLERR or POLLHUP, unmap ring buffer from both the main
>> evlist and overwrite evlist.
> When you use an auxiliary evlist this makes evlist->parent be different
> than evlist, right? So can't we just hide this from tools and do it all
> in perf_evlist__filter_pollfd?

So we need to find all children from parent. Currently we can only track
parent from children. This is not enough. Although currently we can pass
rec->overwrite_evlist to the filter so perf_evlist__filter_pollfd knows
it should release mmaps from both evlists, if in future we have more than
one aux_evlists it doesn't work.

Thank you.


> This way we will not need to expose perf_evlist__mmap_put(), etc.
>
> I haven't tried to _actually_ do this, just asking from browsing the
> patchkit and with the goal of hiding the internals of this thing inside
> evlist.c as much as possible.
>
> - Arnaldo
>   
>> Signed-off-by: Wang Nan <wangnan0@huawei.com>
>> Cc: He Kuang <hekuang@huawei.com>
>> Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
>> Cc: Jiri Olsa <jolsa@kernel.org>
>> Cc: Masami Hiramatsu <mhiramat@kernel.org>
>> Cc: Namhyung Kim <namhyung@kernel.org>
>> Cc: Zefan Li <lizefan@huawei.com>
>> Cc: pi3orama@163.com
>> ---
>>   tools/perf/builtin-record.c | 30 +++++++++++++++++++++---------
>>   tools/perf/util/evlist.c    |  3 +--
>>   tools/perf/util/evlist.h    |  2 +-
>>   3 files changed, 23 insertions(+), 12 deletions(-)
>>
>> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
>> index b9094f0..ca6376c 100644
>> --- a/tools/perf/builtin-record.c
>> +++ b/tools/perf/builtin-record.c
>> @@ -914,6 +914,26 @@ out:
>>   	return err;
>>   }
>>   
>> +static void record__munmap_filtered(struct fdarray *fda, int fd, void *arg)
>> +{
>> +	struct record *rec = (struct record *)arg;
>> +
>> +	perf_evlist__mmap_put(rec->evlist, fda->priv[fd].idx);
>> +	if (rec->overwrite_evlist)
>> +		perf_evlist__mmap_put(rec->overwrite_evlist, fda->priv[fd].idx);
>> +}
>> +
>> +static int record__filter_pollfd(struct record *rec)
>> +{
>> +	/*
>> +	 * Although we may have auxiliray evlist, there is
>> +	 * only one pollfd, so we don't need to filter pollfd
>> +	 * for auxiliray evlist.
>> +	 */
>> +	return fdarray__filter(&rec->evlist->pollfd, POLLERR | POLLHUP,
>> +			       record__munmap_filtered, rec);
>> +}
>> +
>>   static int __cmd_record(struct record *rec, int argc, const char **argv)
>>   {
>>   	int err;
>> @@ -1150,15 +1170,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
>>   				err = 0;
>>   			waking++;
>>   
>> -			/*
>> -			 * Although we may have auxiliray evlist, there is
>> -			 * only one pollfd, so we don't need to filter pollfd
>> -			 * for auxiliray evlist.
>> -			 *
>> -			 * TODO: if an event is terminated (POLLERR | POLLHUP),
>> -			 * unmap mmaps for auxiliray evlist too.
>> -			 */
>> -			if (perf_evlist__filter_pollfd(rec->evlist, POLLERR | POLLHUP) == 0)
>> +			if (record__filter_pollfd(rec) == 0)
>>   				draining = true;
>>   		}
>>   
>> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
>> index e8fcb22..d43ee81 100644
>> --- a/tools/perf/util/evlist.c
>> +++ b/tools/perf/util/evlist.c
>> @@ -27,7 +27,6 @@
>>   #include <linux/log2.h>
>>   #include <linux/err.h>
>>   
>> -static void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx);
>>   static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx);
>>   
>>   #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
>> @@ -863,7 +862,7 @@ static void perf_evlist__mmap_get(struct perf_evlist *evlist, int idx)
>>   	atomic_inc(&evlist->mmap[idx].refcnt);
>>   }
>>   
>> -static void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx)
>> +void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx)
>>   {
>>   	struct perf_mmap *md = &evlist->mmap[idx];
>>   
>> diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
>> index 41e65ac..ba5e006 100644
>> --- a/tools/perf/util/evlist.h
>> +++ b/tools/perf/util/evlist.h
>> @@ -141,7 +141,7 @@ union perf_event *perf_evlist__mmap_read_backward(struct perf_evlist *evlist,
>>   void perf_evlist__mmap_read_catchup(struct perf_evlist *evlist, int idx);
>>   
>>   void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx);
>> -
>> +void perf_evlist__mmap_put(struct perf_evlist *evlist, int idx);
>>   int perf_evlist__pause(struct perf_evlist *evlist);
>>   int perf_evlist__resume(struct perf_evlist *evlist);
>>   int perf_evlist__open(struct perf_evlist *evlist);
>> -- 
>> 1.8.3.4

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