linux-kernel - Re: [BUG] scheduler: first timeslice of the exiting thread

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <87odlxxbzv.wl%takeuchi_satoru@jp.fujitsu.com>
Date:	Tue, 10 Apr 2007 10:19:00 +0900
From:	Satoru Takeuchi <takeuchi_satoru@...fujitsu.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Satoru Takeuchi <takeuchi_satoru@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Galbraith <efault@....de>, linux-kernel@...r.kernel.org
Subject: Re: [BUG] scheduler: first timeslice of the exiting thread

> >  b) Doesn't add extra field and have thread's parent the creater, which is
> >     same as process creation. However it has many side effects, for example,
> >     we also need to change sys_getppid() implementation.
> 
> can't understand this, sorry.

Sorry for my obscure English, perhaps I need more training about writing.

What I meant is ...

If thread A creates thread B and A's parent is C, B's parent is also C
currently. In my idea (b), copy_process() doesn't varies B's parent by
CLONE_THREAD flag and B's parent is A. In this case, there is no need to
change sched_exit() and doesn't need to add extra field. However, we need
to change other code as sysy_getppid(), forget_original_parent(), and so on.

It's same as past linux kernel behavior. I don't know the details when and
why these code was changed (and this problem was overlooked then). Once I
thought I came up with good idea, but now I'm rocking back on my heels
because it seems to need many code change.

Satoru
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/