From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
To: "bibo,mao" <bibo_mao@linux.intel.com>
Cc: "bibo,mao" <bibo.mao@intel.com>,
"Keshavamurthy, Anil S" <anil.s.keshavamurthy@intel.com>,
Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
Prasanna S Panchamukhi <prasanna@in.ibm.com>,
Ingo Molnar <mingo@redhat.com>,
SystemTAP <systemtap@sources.redhat.com>,
Satoshi Oshima <soshima@redhat.com>,
Hideo Aoki <haoki@redhat.com>,
Yumiko Sugita <yumiko.sugita.yf@hitachi.com>
Subject: Re: [RFC][PATCH][kprobe] enabling booster on the preemptible kernel, take 2
Date: Tue, 31 Oct 2006 13:47:00 -0000 [thread overview]
Message-ID: <45474CDB.3080705@hitachi.com> (raw)
In-Reply-To: <4546BCE7.9030008@linux.intel.com>
Hi bibo,
bibo,mao wrote:
>>> I do not know whether there exists non-freezeable and preemptive kernel
>>> thread, if there exist then this thread will not be frozen.
>>
>> In that case, freeze_processes() returns the positive value which
>> means how many processes are not frozen. If freeze_processes()
>> returns non-zero, this function aborts the garbage collection.
>>
> But from the code, return value of freeze_processes() represents how many
> processes can be frozen but are not frozen. I grep the kernel code, there
> still exists many processes which flag is PF_NOFREEZE.
> I think if current probed thread is PF_NOFREEZE, then kprobe_handler
> need skip the bootser.
OK, I see.
It seems problematic because the softirqd is PF_NOFREEZE and it
can execute most of functions...
I think we need to find a new way to solve this problem.
Thank you for your advice.
--
Masami HIRAMATSU
Linux Technology Center
Hitachi, Ltd., Systems Development Laboratory
E-mail: masami.hiramatsu.pt@hitachi.com
next prev parent reply other threads:[~2006-10-31 13:17 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-16 13:14 Masami Hiramatsu
2006-10-19 9:00 ` [PATCH 1/5][djprobe] generalize the length of the instruction slots Masami Hiramatsu
2006-10-19 9:03 ` [PATCH 2/5][djprobe] djprobe core patch Masami Hiramatsu
2006-10-27 23:34 ` Keshavamurthy, Anil S
2006-10-30 14:07 ` Masami Hiramatsu
2006-10-30 14:11 ` Ingo Molnar
2006-10-19 9:03 ` [PATCH 4/5][djprobe] djprobe for i386 architecture code Masami Hiramatsu
2006-10-19 9:03 ` [PATCH 3/5][djprobe] export set_jmp_op() for sharing Masami Hiramatsu
2006-10-19 9:04 ` [PATCH 5/5][djprobe] delayed invoking commit_djprobes() Masami Hiramatsu
2006-10-19 9:04 ` [RFC][djprobe] djprobe examples Masami Hiramatsu
2006-10-30 6:37 ` [RFC][PATCH][kprobe] enabling booster on the preemptible kernel, take 2 bibo,mao
2006-10-30 14:07 ` Masami Hiramatsu
2006-10-31 9:14 ` bibo,mao
2006-10-31 13:47 ` Masami Hiramatsu [this message]
2006-10-31 13:49 ` Ingo Molnar
2006-10-31 14:13 ` Ingo Molnar
2006-10-31 16:39 ` Masami Hiramatsu
2006-11-01 17:01 bibo mao
2006-11-02 18:51 ` Masami Hiramatsu
2006-11-03 9:16 ` bibo,mao
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