9fans - fans of the OS Plan 9 from Bell Labs
 help / color / mirror / Atom feed
From: Richard Miller <9fans@hamnavoe.com>
To: 9fans@9fans.net
Subject: Re: [9fans] duppage
Date: Wed, 29 Feb 2012 19:35:06 +0000	[thread overview]
Message-ID: <b5ad0b54f863149fd18cdbeffbddc852@hamnavoe.com> (raw)
In-Reply-To: <7d7ee33e0ce036134194a640c6b2cc81@gmx.de>

> the problem we have is that we temporarily unlock
> p to acquire palloc lock, wich opens a chance for
> someone to take a ref on p, but duppage doesnt
> recheck after reqcquiering the p lock.
>
> if this happens, duppage() has to return and let
> fixfault() make a copy for its segment.

That makes sense to me.

Should we be worried that duppage returns 0 or 1 for
success or failure, but fixfault ignores the return value?




  reply	other threads:[~2012-02-29 19:35 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-02-25  3:29 cinap_lenrek
2012-02-25 20:09 ` Charles Forsyth
2012-02-26  4:13 ` erik quanstrom
2012-02-29 10:31 ` Richard Miller
2012-02-29 14:14   ` cinap_lenrek
2012-02-29 19:35     ` Richard Miller [this message]
2012-02-29 19:50       ` cinap_lenrek
2012-03-03  9:58         ` Richard Miller
2012-03-03 19:30           ` cinap_lenrek
2012-03-13 23:55 erik quanstrom
2014-06-08 14:53 erik quanstrom
2014-06-08 17:15 ` cinap_lenrek
2014-06-08 17:22 ` Charles Forsyth
2014-06-08 17:34   ` erik quanstrom
2014-06-08 17:50     ` Charles Forsyth
2014-06-08 17:53       ` erik quanstrom
2014-06-08 17:54       ` cinap_lenrek
2014-06-08 18:15         ` erik quanstrom
2014-06-08 18:37           ` Charles Forsyth
2014-06-09  8:23             ` Charles Forsyth
2014-06-09 13:21               ` erik quanstrom
2014-06-10  1:35               ` erik quanstrom
2014-06-10  3:53                 ` cinap_lenrek
2014-06-10 12:58                   ` erik quanstrom
2014-06-10 13:56                     ` Steve Simon
2014-06-10 15:30                       ` erik quanstrom
2014-06-10 14:06                     ` cinap_lenrek
2014-06-11 18:04           ` erik quanstrom
2014-06-08 17:49   ` cinap_lenrek

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=b5ad0b54f863149fd18cdbeffbddc852@hamnavoe.com \
    --to=9fans@hamnavoe.com \
    --cc=9fans@9fans.net \
    /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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).