* [PATCH] net: pktgen: don't abuse current->state in pktgen_thread_worker()
@ 2015-08-04 16:33 Oleg Nesterov
2015-08-04 16:40 ` Marcelo Ricardo Leitner
2015-08-07 6:52 ` David Miller
0 siblings, 2 replies; 5+ messages in thread
From: Oleg Nesterov @ 2015-08-04 16:33 UTC (permalink / raw)
To: David S. Miller, Huang Ying
Cc: Alexei Starovoitov, Jan Stancek, Jesper Brouer, Marcelo Leitner,
netdev, linux-kernel
Commit 1fbe4b46caca "net: pktgen: kill the Wait for kthread_stop
code in pktgen_thread_worker()" removed (in particular) the final
__set_current_state(TASK_RUNNING) and I didn't notice the previous
set_current_state(TASK_INTERRUPTIBLE). This triggers the warning
in __might_sleep() after return.
Afaics, we can simply remove both set_current_state()'s, and we
could do this a long ago right after ef87979c273a2 "pktgen: better
scheduler friendliness" which changed pktgen_thread_worker() to
use wait_event_interruptible_timeout().
Reported-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
net/core/pktgen.c | 3 ---
1 files changed, 0 insertions(+), 3 deletions(-)
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 8e0181a..6717684 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -3432,8 +3432,6 @@ static int pktgen_thread_worker(void *arg)
set_freezable();
- __set_current_state(TASK_RUNNING);
-
while (!kthread_should_stop()) {
pkt_dev = next_to_run(t);
@@ -3478,7 +3476,6 @@ static int pktgen_thread_worker(void *arg)
try_to_freeze();
}
- set_current_state(TASK_INTERRUPTIBLE);
pr_debug("%s stopping all device\n", t->tsk->comm);
pktgen_stop(t);
--
1.5.5.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] net: pktgen: don't abuse current->state in pktgen_thread_worker()
2015-08-04 16:33 [PATCH] net: pktgen: don't abuse current->state in pktgen_thread_worker() Oleg Nesterov
@ 2015-08-04 16:40 ` Marcelo Ricardo Leitner
2015-08-04 17:08 ` Oleg Nesterov
2015-08-07 6:52 ` David Miller
1 sibling, 1 reply; 5+ messages in thread
From: Marcelo Ricardo Leitner @ 2015-08-04 16:40 UTC (permalink / raw)
To: Oleg Nesterov
Cc: David S. Miller, Huang Ying, Alexei Starovoitov, Jan Stancek,
Jesper Brouer, netdev, linux-kernel
On Tue, Aug 04, 2015 at 06:33:34PM +0200, Oleg Nesterov wrote:
> Commit 1fbe4b46caca "net: pktgen: kill the Wait for kthread_stop
> code in pktgen_thread_worker()" removed (in particular) the final
> __set_current_state(TASK_RUNNING) and I didn't notice the previous
> set_current_state(TASK_INTERRUPTIBLE). This triggers the warning
> in __might_sleep() after return.
>
> Afaics, we can simply remove both set_current_state()'s, and we
> could do this a long ago right after ef87979c273a2 "pktgen: better
> scheduler friendliness" which changed pktgen_thread_worker() to
> use wait_event_interruptible_timeout().
>
> Reported-by: Huang Ying <ying.huang@intel.com>
> Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Interesting that it didn't happen in my tests yet per description it
should have. Huang, did you do anything special to trigger this?
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] net: pktgen: don't abuse current->state in pktgen_thread_worker()
2015-08-04 16:40 ` Marcelo Ricardo Leitner
@ 2015-08-04 17:08 ` Oleg Nesterov
2015-08-04 17:30 ` Marcelo Ricardo Leitner
0 siblings, 1 reply; 5+ messages in thread
From: Oleg Nesterov @ 2015-08-04 17:08 UTC (permalink / raw)
To: Marcelo Ricardo Leitner
Cc: David S. Miller, Huang Ying, Alexei Starovoitov, Jan Stancek,
Jesper Brouer, netdev, linux-kernel
On 08/04, Marcelo Ricardo Leitner wrote:
>
> On Tue, Aug 04, 2015 at 06:33:34PM +0200, Oleg Nesterov wrote:
> > Commit 1fbe4b46caca "net: pktgen: kill the Wait for kthread_stop
> > code in pktgen_thread_worker()" removed (in particular) the final
> > __set_current_state(TASK_RUNNING) and I didn't notice the previous
> > set_current_state(TASK_INTERRUPTIBLE). This triggers the warning
> > in __might_sleep() after return.
> >
> > Afaics, we can simply remove both set_current_state()'s, and we
> > could do this a long ago right after ef87979c273a2 "pktgen: better
> > scheduler friendliness" which changed pktgen_thread_worker() to
> > use wait_event_interruptible_timeout().
> >
> > Reported-by: Huang Ying <ying.huang@intel.com>
> > Signed-off-by: Oleg Nesterov <oleg@redhat.com>
>
> Interesting that it didn't happen in my tests yet per description it
> should have. Huang, did you do anything special to trigger this?
Do you have CONFIG_DEBUG_ATOMIC_SLEEP=y ?
Oleg.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] net: pktgen: don't abuse current->state in pktgen_thread_worker()
2015-08-04 17:08 ` Oleg Nesterov
@ 2015-08-04 17:30 ` Marcelo Ricardo Leitner
0 siblings, 0 replies; 5+ messages in thread
From: Marcelo Ricardo Leitner @ 2015-08-04 17:30 UTC (permalink / raw)
To: Oleg Nesterov
Cc: David S. Miller, Huang Ying, Alexei Starovoitov, Jan Stancek,
Jesper Brouer, netdev, linux-kernel
On Tue, Aug 04, 2015 at 07:08:27PM +0200, Oleg Nesterov wrote:
> On 08/04, Marcelo Ricardo Leitner wrote:
> >
> > On Tue, Aug 04, 2015 at 06:33:34PM +0200, Oleg Nesterov wrote:
> > > Commit 1fbe4b46caca "net: pktgen: kill the Wait for kthread_stop
> > > code in pktgen_thread_worker()" removed (in particular) the final
> > > __set_current_state(TASK_RUNNING) and I didn't notice the previous
> > > set_current_state(TASK_INTERRUPTIBLE). This triggers the warning
> > > in __might_sleep() after return.
> > >
> > > Afaics, we can simply remove both set_current_state()'s, and we
> > > could do this a long ago right after ef87979c273a2 "pktgen: better
> > > scheduler friendliness" which changed pktgen_thread_worker() to
> > > use wait_event_interruptible_timeout().
> > >
> > > Reported-by: Huang Ying <ying.huang@intel.com>
> > > Signed-off-by: Oleg Nesterov <oleg@redhat.com>
> >
> > Interesting that it didn't happen in my tests yet per description it
> > should have. Huang, did you do anything special to trigger this?
>
> Do you have CONFIG_DEBUG_ATOMIC_SLEEP=y ?
Ahh yes, probably not. Thanks.
Marcelo
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] net: pktgen: don't abuse current->state in pktgen_thread_worker()
2015-08-04 16:33 [PATCH] net: pktgen: don't abuse current->state in pktgen_thread_worker() Oleg Nesterov
2015-08-04 16:40 ` Marcelo Ricardo Leitner
@ 2015-08-07 6:52 ` David Miller
1 sibling, 0 replies; 5+ messages in thread
From: David Miller @ 2015-08-07 6:52 UTC (permalink / raw)
To: oleg; +Cc: ying.huang, ast, jstancek, brouer, mleitner, netdev, linux-kernel
From: Oleg Nesterov <oleg@redhat.com>
Date: Tue, 4 Aug 2015 18:33:34 +0200
> Commit 1fbe4b46caca "net: pktgen: kill the Wait for kthread_stop
> code in pktgen_thread_worker()" removed (in particular) the final
> __set_current_state(TASK_RUNNING) and I didn't notice the previous
> set_current_state(TASK_INTERRUPTIBLE). This triggers the warning
> in __might_sleep() after return.
>
> Afaics, we can simply remove both set_current_state()'s, and we
> could do this a long ago right after ef87979c273a2 "pktgen: better
> scheduler friendliness" which changed pktgen_thread_worker() to
> use wait_event_interruptible_timeout().
>
> Reported-by: Huang Ying <ying.huang@intel.com>
> Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Applied, thank you.
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2015-08-07 6:53 UTC | newest]
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2015-08-04 16:33 [PATCH] net: pktgen: don't abuse current->state in pktgen_thread_worker() Oleg Nesterov
2015-08-04 16:40 ` Marcelo Ricardo Leitner
2015-08-04 17:08 ` Oleg Nesterov
2015-08-04 17:30 ` Marcelo Ricardo Leitner
2015-08-07 6:52 ` David Miller
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