[Qemu-devel] [PATCH for-2.5?] iothread: include id in thread name

[Qemu-devel] [PATCH for-2.5?] iothread: include id in thread name

[Paolo Bonzini]

This makes it easier to find the desired thread.  Use "IO" plus the id;
even with the 14 character limit on the thread name, enough of the id should
be readable (e.g. "IO iothreadNNN" with three characters for the number).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
	v1->v2: shorten prefix (David Gilbert)
---
 iothread.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/iothread.c b/iothread.c
index da6ce7b..1b8c2bb 100644
--- a/iothread.c
+++ b/iothread.c
@@ -72,6 +72,7 @@ static void iothread_complete(UserCreatable *obj, Error **errp)
 {
     Error *local_error = NULL;
     IOThread *iothread = IOTHREAD(obj);
+    char *name, *thread_name;
 
     iothread->stopping = false;
     iothread->thread_id = -1;
@@ -87,8 +88,12 @@ static void iothread_complete(UserCreatable *obj, Error **errp)
     /* This assumes we are called from a thread with useful CPU affinity for us
      * to inherit.
      */
-    qemu_thread_create(&iothread->thread, "iothread", iothread_run,
+    name = object_get_canonical_path_component(OBJECT(obj));
+    thread_name = g_strdup_printf("IO %s", name);
+    qemu_thread_create(&iothread->thread, thread_name, iothread_run,
                        iothread, QEMU_THREAD_JOINABLE);
+    g_free(thread_name);
+    g_free(name);
 
     /* Wait for initialization to complete */
     qemu_mutex_lock(&iothread->init_done_lock);
-- 
1.8.3.1

Re: [Qemu-devel] [PATCH for-2.5?] iothread: include id in thread name

[Dr. David Alan Gilbert]

* Paolo Bonzini (pbonzini@redhat.com) wrote:
> This makes it easier to find the desired thread.  Use "IO" plus the id;
> even with the 14 character limit on the thread name, enough of the id should
> be readable (e.g. "IO iothreadNNN" with three characters for the number).
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

(If it's too long, the thread name just doesn't get set)

Dave

> ---
> 	v1->v2: shorten prefix (David Gilbert)
> ---
>  iothread.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/iothread.c b/iothread.c
> index da6ce7b..1b8c2bb 100644
> --- a/iothread.c
> +++ b/iothread.c
> @@ -72,6 +72,7 @@ static void iothread_complete(UserCreatable *obj, Error **errp)
>  {
>      Error *local_error = NULL;
>      IOThread *iothread = IOTHREAD(obj);
> +    char *name, *thread_name;
>  
>      iothread->stopping = false;
>      iothread->thread_id = -1;
> @@ -87,8 +88,12 @@ static void iothread_complete(UserCreatable *obj, Error **errp)
>      /* This assumes we are called from a thread with useful CPU affinity for us
>       * to inherit.
>       */
> -    qemu_thread_create(&iothread->thread, "iothread", iothread_run,
> +    name = object_get_canonical_path_component(OBJECT(obj));
> +    thread_name = g_strdup_printf("IO %s", name);
> +    qemu_thread_create(&iothread->thread, thread_name, iothread_run,
>                         iothread, QEMU_THREAD_JOINABLE);
> +    g_free(thread_name);
> +    g_free(name);
>  
>      /* Wait for initialization to complete */
>      qemu_mutex_lock(&iothread->init_done_lock);
> -- 
> 1.8.3.1
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK

Re: [Qemu-devel] [PATCH for-2.5?] iothread: include id in thread name

[Stefan Hajnoczi]

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On Tue, Nov 24, 2015 at 02:46:44PM +0100, Paolo Bonzini wrote:
> This makes it easier to find the desired thread.  Use "IO" plus the id;
> even with the 14 character limit on the thread name, enough of the id should
> be readable (e.g. "IO iothreadNNN" with three characters for the number).
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
> 	v1->v2: shorten prefix (David Gilbert)
> ---
>  iothread.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)

Thanks, applied to my block tree:
https://github.com/stefanha/qemu/commits/block

Stefan

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[Qemu-devel] [PATCH for-2.5] iothread: include id in thread name

[Paolo Bonzini]

This makes it easier to find the desired thread

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 iothread.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/iothread.c b/iothread.c
index da6ce7b..8a1d6f8 100644
--- a/iothread.c
+++ b/iothread.c
@@ -72,6 +72,7 @@ static void iothread_complete(UserCreatable *obj, Error **errp)
 {
     Error *local_error = NULL;
     IOThread *iothread = IOTHREAD(obj);
+    char *name, *thread_name;
 
     iothread->stopping = false;
     iothread->thread_id = -1;
@@ -87,8 +88,12 @@ static void iothread_complete(UserCreatable *obj, Error **errp)
     /* This assumes we are called from a thread with useful CPU affinity for us
      * to inherit.
      */
-    qemu_thread_create(&iothread->thread, "iothread", iothread_run,
+    name = object_get_canonical_path_component(OBJECT(obj));
+    thread_name = g_strdup_printf("iothread %s", name);
+    qemu_thread_create(&iothread->thread, thread_name, iothread_run,
                        iothread, QEMU_THREAD_JOINABLE);
+    g_free(thread_name);
+    g_free(name);
 
     /* Wait for initialization to complete */
     qemu_mutex_lock(&iothread->init_done_lock);
-- 
1.8.3.1

Re: [Qemu-devel] [PATCH for-2.5] iothread: include id in thread name

[Dr. David Alan Gilbert]

* Paolo Bonzini (pbonzini@redhat.com) wrote:
> This makes it easier to find the desired thread
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>  iothread.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/iothread.c b/iothread.c
> index da6ce7b..8a1d6f8 100644
> --- a/iothread.c
> +++ b/iothread.c
> @@ -72,6 +72,7 @@ static void iothread_complete(UserCreatable *obj, Error **errp)
>  {
>      Error *local_error = NULL;
>      IOThread *iothread = IOTHREAD(obj);
> +    char *name, *thread_name;
>  
>      iothread->stopping = false;
>      iothread->thread_id = -1;
> @@ -87,8 +88,12 @@ static void iothread_complete(UserCreatable *obj, Error **errp)
>      /* This assumes we are called from a thread with useful CPU affinity for us
>       * to inherit.
>       */
> -    qemu_thread_create(&iothread->thread, "iothread", iothread_run,
> +    name = object_get_canonical_path_component(OBJECT(obj));
> +    thread_name = g_strdup_printf("iothread %s", name);

Yes, that's a good idea; Can you shorten that to just "IO %s"  please,
for three reasons:

 1) There is a ~14 character limit on the size of that string
 2) We use CPU ...   for the CPU threads.
 3) It's a threadname, it doesn't need to say thread

Dave

> +    qemu_thread_create(&iothread->thread, thread_name, iothread_run,
>                         iothread, QEMU_THREAD_JOINABLE);
> +    g_free(thread_name);
> +    g_free(name);
>  
>      /* Wait for initialization to complete */
>      qemu_mutex_lock(&iothread->init_done_lock);
> -- 
> 1.8.3.1
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK