From: Li Zefan <lizefan@huawei.com>
To: "zhangwei(Jovi)" <jovi.zhangwei@huawei.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@redhat.com>,
Steven Rostedt <rostedt@goodmis.org>,
Jens Axboe <axboe@kernel.dk>, Al Viro <viro@zeniv.linux.org.uk>,
Eric Dumazet <edumazet@google.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH V2] relay: fix timer madness
Date: Wed, 10 Jul 2013 11:37:26 +0800 [thread overview]
Message-ID: <51DCD6F6.2080802@huawei.com> (raw)
In-Reply-To: <51DCC48E.8050003@huawei.com>
On 2013/7/10 10:18, zhangwei(Jovi) wrote:
> When I'm using ktap script to tracing all event tracepoints by relay
> transport, without this patch, the system will hang in few seconds.
>
> I found the original patch discussion in 2007.
> http://marc.info/?l=linux-kernel&m=118544794717162&w=2
> (In that mail thread, the patch didn't fix that problem, but it fix
> the problem I encountered now)
>
> Changed from v1:
> mod timer interval changed from jiffies+1 to HZ/10, as Ingo suggested.
>
> Original patch changelog from Ingo in 2007:
>
> Remove timer calls (!!!) from deep within the tracing infrastructure.
> This was totally bogus code that can cause lockups and worse.
> Poll the buffer every 2 jiffies for now.
>
> Signed-off-by: Ingo Molnar <mingo@elte.hu>
> Signed-off-by: "zhangwei(Jovi)" <jovi.zhangwei@huawei.com>
> Cc: Steven Rostedt <rostedt@goodmis.org>
> Cc: Jens Axboe <axboe@kernel.dk>
> Cc: Al Viro <viro@zeniv.linux.org.uk>
> Cc: Eric Dumazet <edumazet@google.com>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
I don't think this patch should have Andrew's signed-off-by?
next prev parent reply other threads:[~2013-07-10 3:49 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-10 2:18 [PATCH V2] relay: fix timer madness zhangwei(Jovi)
2013-07-10 3:37 ` Li Zefan [this message]
2013-07-10 3:57 ` Andrew Morton
2013-07-19 22:45 ` Dan Carpenter
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