From: Roland McGrath <roland@redhat.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Alexey Dobriyan <adobriyan@gmail.com>,
Ananth Mavinakayanahalli <ananth@in.ibm.com>,
Christoph Hellwig <hch@infradead.org>,
"Frank Ch. Eigler" <fche@redhat.com>, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org, utrace-devel@redhat.com
Subject: Re: [RFC,PATCH 14/14] utrace core
Date: Mon, 14 Dec 2009 11:44:41 -0800 (PST) [thread overview]
Message-ID: <20091214194441.4D6BFE24E@magilla.sf.frob.com> (raw)
In-Reply-To: Oleg Nesterov's message of Monday, 14 December 2009 18:03:27 +0100 <20091214170327.GA7666@redhat.com>
> Yes, I think this is correct. It is fine to miss ->pending_attach == T,
> and in any case the new attacher can come right after the check, even
> if it was checked under utrace->lock.
Right.
> It is important that the tracee can't miss, say, UTRACE_REPORT request
> (as you already explained), and every time the tracee clears ->resume
> it calls splice_attaching().
Right.
> > In the stopped cases, there are lots of locks and barriers and things
> > after resuming. (Oleg?)
>
> Every time the tracee resumes after TASK_TRACED it uses utrace->lock
> to synchronize with utrace_control/etc, it must see any changes.
And TASK_STOPPED?
Please send me patches to add whatever comments would make all this clear
enough to Peter when reading the code.
Thanks,
Roland
next prev parent reply other threads:[~2009-12-14 19:45 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-24 20:02 [RFC,PATCH 14/14] utrace core Oleg Nesterov
2009-11-24 20:32 ` Andi Kleen
2009-11-24 20:41 ` Oleg Nesterov
2009-11-24 21:26 ` Andi Kleen
2009-11-24 21:31 ` Frank Ch. Eigler
2009-11-24 21:34 ` Andi Kleen
2009-11-24 21:44 ` Oleg Nesterov
2009-11-25 8:46 ` Andi Kleen
2009-11-25 14:55 ` Oleg Nesterov
2009-11-25 16:00 ` Ingo Molnar
2009-11-25 21:50 ` Christoph Hellwig
2009-12-01 23:47 ` Roland McGrath
2009-12-01 19:54 ` Peter Zijlstra
2009-12-01 22:08 ` Oleg Nesterov
2009-12-07 18:34 ` Peter Zijlstra
2009-12-08 15:04 ` Oleg Nesterov
2009-12-08 15:29 ` Peter Zijlstra
2009-12-08 16:31 ` Oleg Nesterov
2009-12-08 18:19 ` Peter Zijlstra
2009-12-08 18:37 ` Oleg Nesterov
2009-12-13 20:48 ` Roland McGrath
2009-12-08 15:35 ` Peter Zijlstra
2009-12-08 17:51 ` Oleg Nesterov
2009-12-02 5:44 ` Roland McGrath
2009-12-02 18:34 ` Oleg Nesterov
2009-12-02 18:49 ` Oleg Nesterov
2009-12-05 19:14 ` Roland McGrath
2009-12-14 0:25 ` Roland McGrath
2009-12-14 13:51 ` Peter Zijlstra
2009-12-14 17:41 ` Oleg Nesterov
2009-12-14 19:31 ` Oleg Nesterov
2009-12-14 19:42 ` Roland McGrath
2009-12-16 11:18 ` Roland McGrath
2009-12-14 17:03 ` Oleg Nesterov
2009-12-14 19:44 ` Roland McGrath [this message]
2009-12-14 20:24 ` Oleg Nesterov
2009-12-15 2:59 ` Roland McGrath
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20091214194441.4D6BFE24E@magilla.sf.frob.com \
--to=roland@redhat.com \
--cc=adobriyan@gmail.com \
--cc=ananth@in.ibm.com \
--cc=fche@redhat.com \
--cc=hch@infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=oleg@redhat.com \
--cc=peterz@infradead.org \
--cc=utrace-devel@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.