* [PATCH 1/2] async: Handle kthread_run() return codes.
@ 2009-01-13 16:43 Cornelia Huck
2009-01-13 16:51 ` Ben Dooks
2009-01-13 20:34 ` Arjan van de Ven
0 siblings, 2 replies; 5+ messages in thread
From: Cornelia Huck @ 2009-01-13 16:43 UTC (permalink / raw)
To: Arjan van de Ven; +Cc: linux-kernel
If we fail to create the manager thread, fall back to non-fastboot.
If we fail to create an async thread, try again when the manager
thread runs again.
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
---
kernel/async.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
--- linux-2.6.orig/kernel/async.c
+++ linux-2.6/kernel/async.c
@@ -315,11 +315,14 @@ static int async_manager_thread(void *un
ec = atomic_read(&entry_count);
while (tc < ec && tc < MAX_THREADS) {
- kthread_run(async_thread, NULL, "async/%i", tc);
+ if (IS_ERR(kthread_run(async_thread, NULL, "async/%i",
+ tc)))
+ /* Try again later. */
+ goto schedule;
atomic_inc(&thread_count);
tc++;
}
-
+schedule:
schedule();
}
remove_wait_queue(&async_new, &wq);
@@ -330,7 +333,9 @@ static int async_manager_thread(void *un
static int __init async_init(void)
{
if (async_enabled)
- kthread_run(async_manager_thread, NULL, "async/mgr");
+ if (IS_ERR(kthread_run(async_manager_thread, NULL,
+ "async/mgr")))
+ async_enabled = 0;
return 0;
}
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH 1/2] async: Handle kthread_run() return codes.
2009-01-13 16:43 [PATCH 1/2] async: Handle kthread_run() return codes Cornelia Huck
@ 2009-01-13 16:51 ` Ben Dooks
2009-01-13 17:46 ` Cornelia Huck
2009-01-13 20:34 ` Arjan van de Ven
1 sibling, 1 reply; 5+ messages in thread
From: Ben Dooks @ 2009-01-13 16:51 UTC (permalink / raw)
To: Cornelia Huck; +Cc: Arjan van de Ven, linux-kernel
On Tue, Jan 13, 2009 at 05:43:04PM +0100, Cornelia Huck wrote:
> If we fail to create the manager thread, fall back to non-fastboot.
> If we fail to create an async thread, try again when the manager
> thread runs again.
>
> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
>
> ---
> kernel/async.c | 11 ++++++++---
> 1 file changed, 8 insertions(+), 3 deletions(-)
>
> --- linux-2.6.orig/kernel/async.c
> +++ linux-2.6/kernel/async.c
> @@ -315,11 +315,14 @@ static int async_manager_thread(void *un
> ec = atomic_read(&entry_count);
>
> while (tc < ec && tc < MAX_THREADS) {
why not add the following to stop the wrapping of kthread_run:
+ struct task_struct *kt;
kt = kthread_run(async_thread, NULL, "async/%i", tc);
if (IS_ERR(kt))
goto schedule;
also, I belive the goto isn't necessary, just break out of the while
if (IS_ERR(kt))
break;
> - kthread_run(async_thread, NULL, "async/%i", tc);
> + if (IS_ERR(kthread_run(async_thread, NULL, "async/%i",
> + tc)))
> + /* Try again later. */
> + goto schedule;
> atomic_inc(&thread_count);
> tc++;
> }
> -
> +schedule:
> schedule();
> }
> remove_wait_queue(&async_new, &wq);
> @@ -330,7 +333,9 @@ static int async_manager_thread(void *un
> static int __init async_init(void)
> {
> if (async_enabled)
> - kthread_run(async_manager_thread, NULL, "async/mgr");
> + if (IS_ERR(kthread_run(async_manager_thread, NULL,
> + "async/mgr")))
> + async_enabled = 0;
> return 0;
> }
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
--
Ben (ben@fluff.org, http://www.fluff.org/)
'a smiley only costs 4 bytes'
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH 1/2] async: Handle kthread_run() return codes.
2009-01-13 16:51 ` Ben Dooks
@ 2009-01-13 17:46 ` Cornelia Huck
0 siblings, 0 replies; 5+ messages in thread
From: Cornelia Huck @ 2009-01-13 17:46 UTC (permalink / raw)
To: Ben Dooks; +Cc: Arjan van de Ven, linux-kernel
On Tue, 13 Jan 2009 16:51:15 +0000,
Ben Dooks <ben-linux@fluff.org> wrote:
> > @@ -315,11 +315,14 @@ static int async_manager_thread(void *un
> > ec = atomic_read(&entry_count);
> >
> > while (tc < ec && tc < MAX_THREADS) {
>
> why not add the following to stop the wrapping of kthread_run:
>
> + struct task_struct *kt;
> kt = kthread_run(async_thread, NULL, "async/%i", tc);
Hm, I don't think avoiding wrapping is worth adding another variable.
> if (IS_ERR(kt))
> goto schedule;
>
> also, I belive the goto isn't necessary, just break out of the while
>
> if (IS_ERR(kt))
> break;
OK, that's a bit nicer. Updated patch follows.
If we fail to create the manager thread, fall back to non-fastboot.
If we fail to create an async thread, try again when the manager
thread runs again.
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
---
kernel/async.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- linux-2.6.orig/kernel/async.c
+++ linux-2.6/kernel/async.c
@@ -315,7 +315,10 @@ static int async_manager_thread(void *un
ec = atomic_read(&entry_count);
while (tc < ec && tc < MAX_THREADS) {
- kthread_run(async_thread, NULL, "async/%i", tc);
+ if (IS_ERR(kthread_run(async_thread, NULL, "async/%i",
+ tc)))
+ /* Try again later. */
+ break;
atomic_inc(&thread_count);
tc++;
}
@@ -330,7 +333,9 @@ static int async_manager_thread(void *un
static int __init async_init(void)
{
if (async_enabled)
- kthread_run(async_manager_thread, NULL, "async/mgr");
+ if (IS_ERR(kthread_run(async_manager_thread, NULL,
+ "async/mgr")))
+ async_enabled = 0;
return 0;
}
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH 1/2] async: Handle kthread_run() return codes.
2009-01-13 16:43 [PATCH 1/2] async: Handle kthread_run() return codes Cornelia Huck
2009-01-13 16:51 ` Ben Dooks
@ 2009-01-13 20:34 ` Arjan van de Ven
2009-01-14 10:34 ` Cornelia Huck
1 sibling, 1 reply; 5+ messages in thread
From: Arjan van de Ven @ 2009-01-13 20:34 UTC (permalink / raw)
To: Cornelia Huck; +Cc: linux-kernel
> ec = atomic_read(&entry_count);
>
> while (tc < ec && tc < MAX_THREADS) {
> - kthread_run(async_thread, NULL, "async/%i",
> tc);
> + if (IS_ERR(kthread_run(async_thread, NULL,
> "async/%i",
> + tc)))
> + /* Try again later. */
> + goto schedule;
I do not like this recovery to be honest. an msleep() followed by a
"continue" is probably much better.
> @@ -330,7 +333,9 @@ static int async_manager_thread(void *un
> static int __init async_init(void)
> {
> if (async_enabled)
> - kthread_run(async_manager_thread, NULL, "async/mgr");
> + if (IS_ERR(kthread_run(async_manager_thread, NULL,
> + "async/mgr")))
> + async_enabled = 0;
hmm maybe; it might make more sense to set it to 0 here, and have the
thread itself set the variable to 1..... that way we KNOW the thread is
running for sure..
--
Arjan van de Ven Intel Open Source Technology Centre
For development, discussion and tips for power savings,
visit http://www.lesswatts.org
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH 1/2] async: Handle kthread_run() return codes.
2009-01-13 20:34 ` Arjan van de Ven
@ 2009-01-14 10:34 ` Cornelia Huck
0 siblings, 0 replies; 5+ messages in thread
From: Cornelia Huck @ 2009-01-14 10:34 UTC (permalink / raw)
To: Arjan van de Ven; +Cc: linux-kernel
On Tue, 13 Jan 2009 20:34:34 +0000,
Arjan van de Ven <arjan@infradead.org> wrote:
> > ec = atomic_read(&entry_count);
> >
> > while (tc < ec && tc < MAX_THREADS) {
> > - kthread_run(async_thread, NULL, "async/%i",
> > tc);
> > + if (IS_ERR(kthread_run(async_thread, NULL,
> > "async/%i",
> > + tc)))
> > + /* Try again later. */
> > + goto schedule;
>
> I do not like this recovery to be honest. an msleep() followed by a
> "continue" is probably much better.
Will change.
>
>
> > @@ -330,7 +333,9 @@ static int async_manager_thread(void *un
> > static int __init async_init(void)
> > {
> > if (async_enabled)
> > - kthread_run(async_manager_thread, NULL, "async/mgr");
> > + if (IS_ERR(kthread_run(async_manager_thread, NULL,
> > + "async/mgr")))
> > + async_enabled = 0;
>
> hmm maybe; it might make more sense to set it to 0 here, and have the
> thread itself set the variable to 1..... that way we KNOW the thread is
> running for sure..
That would look a bit strange to me.
setup_async sets async_enabled -> async_init unsets it again ->
async_manager_thread sets it again
If anything, we could use two variables (use_async and async_enabled),
but that smells of overengeneering to me...
^ permalink raw reply [flat|nested] 5+ messages in thread
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2009-01-13 16:43 [PATCH 1/2] async: Handle kthread_run() return codes Cornelia Huck
2009-01-13 16:51 ` Ben Dooks
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2009-01-13 20:34 ` Arjan van de Ven
2009-01-14 10:34 ` Cornelia Huck
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